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  Subjects -> POLITICAL SCIENCE (Total: 881 journals)
    - CIVIL RIGHTS (10 journals)
    - INTERNATIONAL RELATIONS (101 journals)
    - POLITICAL SCIENCE (747 journals)
    - POLITICAL SCIENCES: GENERAL (23 journals)

POLITICAL SCIENCE (747 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 281 Journals sorted alphabetically
A Contracorriente     Open Access  
Ab Imperio     Full-text available via subscription   (Followers: 1)
Acta Borealia: A Nordic Journal of Circumpolar Societies     Hybrid Journal   (Followers: 1)
Acta Politica Estica     Open Access  
Acta Universitatis Sapientiae, European and Regional Studies     Open Access  
Administrative Science Quarterly     Full-text available via subscription   (Followers: 143)
Affirmations : of the modern     Open Access   (Followers: 1)
AFFRIKA Journal of Politics, Economics and Society     Full-text available via subscription   (Followers: 1)
Africa Conflict Monitor     Full-text available via subscription   (Followers: 3)
Africa Insight     Full-text available via subscription   (Followers: 14)
Africa Institute Occasional Paper     Full-text available via subscription   (Followers: 2)
Africa Renewal     Free   (Followers: 5)
Africa Review : Journal of the African Studies Association of India     Hybrid Journal   (Followers: 1)
Africa Today     Full-text available via subscription   (Followers: 16)
African Affairs     Hybrid Journal   (Followers: 59)
African Conflict and Peacebuilding Review     Full-text available via subscription   (Followers: 10)
African Diaspora     Open Access   (Followers: 8)
African East-Asian Affairs     Open Access   (Followers: 6)
African Identities     Hybrid Journal   (Followers: 11)
African Journal of Democracy and Governance     Full-text available via subscription   (Followers: 4)
African Journal of Rhetoric     Full-text available via subscription   (Followers: 1)
African Renaissance     Full-text available via subscription   (Followers: 1)
African Yearbook of Rhetoric     Full-text available via subscription   (Followers: 1)
Africanus     Full-text available via subscription   (Followers: 2)
Afrique contemporaine : La revue de l'Afrique et du développement     Full-text available via subscription   (Followers: 2)
Agenda Política     Open Access  
Agenda: A Journal of Policy Analysis and Reform     Full-text available via subscription   (Followers: 1)
Agrarian South : Journal of Political Economy     Hybrid Journal   (Followers: 1)
Akademik İncelemeler Dergisi     Open Access   (Followers: 1)
Alternatives : Global, Local, Political     Hybrid Journal   (Followers: 14)
Altre Modernità     Open Access   (Followers: 3)
América Latina Hoy     Open Access   (Followers: 1)
American Communist History     Hybrid Journal   (Followers: 18)
American Foreign Policy Interests: The Journal of the National Committee on American Foreign Policy     Hybrid Journal   (Followers: 9)
American Journal of Political Science     Hybrid Journal   (Followers: 250)
American Political Science Review     Hybrid Journal   (Followers: 211)
American Political Thought     Full-text available via subscription   (Followers: 9)
American Politics Research     Hybrid Journal   (Followers: 24)
American Quarterly     Full-text available via subscription   (Followers: 16)
Anacronismo e Irrupción     Open Access  
Analecta política     Open Access  
Análise Social     Open Access   (Followers: 1)
Annales UMCS, Politologia     Open Access  
Annals of the American Academy of Political and Social Science     Hybrid Journal   (Followers: 37)
Annual Review of Economics     Full-text available via subscription   (Followers: 30)
Annual Review of Political Science     Full-text available via subscription   (Followers: 132)
AQ - Australian Quarterly     Full-text available via subscription   (Followers: 1)
Arabian Humanities     Open Access   (Followers: 1)
Arctic Review on Law and Politics     Open Access   (Followers: 1)
Arena Journal     Full-text available via subscription   (Followers: 1)
Asia & the Pacific Policy Studies     Open Access   (Followers: 14)
Asia Minor Studies     Open Access   (Followers: 2)
Asia Policy     Full-text available via subscription   (Followers: 6)
Asia-Pacific Journal : Japan Focus     Open Access   (Followers: 7)
Asia-Pacific Review     Hybrid Journal   (Followers: 13)
Asian Affairs: An American Review     Hybrid Journal   (Followers: 2)
Asian Journal of Comparative Politics     Hybrid Journal   (Followers: 3)
Asian Journal of Political Science     Hybrid Journal   (Followers: 15)
Asian Politics and Policy     Hybrid Journal   (Followers: 13)
Astropolitics: The International Journal of Space Politics & Policy     Hybrid Journal   (Followers: 10)
AUDEM : The International Journal of Higher Education and Democracy     Full-text available via subscription   (Followers: 10)
Aurora. Revista de Arte, Mídia e Política     Open Access  
Australasian Review of African Studies, The     Full-text available via subscription   (Followers: 2)
Australian Journal of International Affairs     Hybrid Journal   (Followers: 23)
Australian Journal of Political Science     Hybrid Journal   (Followers: 14)
Austrian Journal of Political Science     Open Access   (Followers: 2)
Balcanica Posnaniensia Acta et studia     Open Access  
Baltic Journal of European Studies     Open Access  
Bandung : Journal of the Global South     Open Access  
Basic Income Studies     Hybrid Journal   (Followers: 9)
Behavioral Sciences of Terrorism and Political Aggression     Hybrid Journal   (Followers: 16)
Beleid en Maatschappij     Full-text available via subscription   (Followers: 2)
BMC International Health and Human Rights     Open Access   (Followers: 6)
Brazilian Political Science Review     Open Access  
Brésil(s)     Open Access   (Followers: 1)
British Journal of Canadian Studies     Hybrid Journal   (Followers: 11)
British Journal of Political Science     Hybrid Journal   (Followers: 144)
British Journal of Politics and International Relations     Hybrid Journal   (Followers: 25)
British Politics     Hybrid Journal   (Followers: 11)
British Review of New Zealand Studies     Full-text available via subscription   (Followers: 2)
Brookings Papers on Economic Activity     Open Access   (Followers: 48)
Bulletin d'histoire politique     Full-text available via subscription   (Followers: 3)
Bustan     Hybrid Journal   (Followers: 1)
Cadernos de Estudos Sociais e Políticos     Open Access  
CADUS - Revista de Estudos de Política, História e Cultura     Open Access  
Cahiers de l'Urmis     Open Access   (Followers: 1)
Cahiers de Sciences politiques de l'ULg     Open Access  
California Journal of Politics and Policy     Hybrid Journal   (Followers: 1)
Cambio 16     Full-text available via subscription   (Followers: 5)
Cambridge Review of International Affairs     Hybrid Journal   (Followers: 18)
Canadian Foreign Policy Journal     Hybrid Journal   (Followers: 4)
Caucasus Survey     Hybrid Journal  
Central and Eastern European Review     Open Access   (Followers: 2)
Central Asian Affairs     Hybrid Journal  
Central Banking     Full-text available via subscription   (Followers: 8)
Central European Journal of Public Policy     Open Access   (Followers: 2)
China : An International Journal     Full-text available via subscription   (Followers: 16)
China perspectives     Open Access   (Followers: 11)
China Quarterly     Hybrid Journal   (Followers: 48)
China Report     Hybrid Journal   (Followers: 8)
China Review International     Full-text available via subscription   (Followers: 8)
China-EU Law Journal     Hybrid Journal   (Followers: 4)
Chinese Journal of Global Governance     Open Access   (Followers: 3)
Chinese Journal of International Politics     Hybrid Journal   (Followers: 8)
Chinese Studies     Open Access   (Followers: 5)
Cittadinanza Europea (LA)     Full-text available via subscription  
Civil Wars     Hybrid Journal   (Followers: 12)
Claremont-UC Undergraduate Research Conference on the European Union     Open Access  
Class, Race and Corporate Power     Open Access   (Followers: 1)
Cold War History     Hybrid Journal   (Followers: 14)
Commonwealth & Comparative Politics     Hybrid Journal   (Followers: 10)
Communication, Politics & Culture     Open Access   (Followers: 12)
Communist and Post-Communist Studies     Hybrid Journal   (Followers: 14)
Comparative Political Studies     Hybrid Journal   (Followers: 139)
Comparative Politics (Russia)     Open Access   (Followers: 5)
Comparative Strategy     Hybrid Journal   (Followers: 8)
Competition & Change     Hybrid Journal   (Followers: 10)
Conferences on New Political Economy     Full-text available via subscription   (Followers: 4)
Confines     Open Access  
Conflict and Society     Full-text available via subscription  
Conflict Management and Peace Science     Hybrid Journal   (Followers: 28)
Conflict Trends     Full-text available via subscription   (Followers: 8)
Conflict, Security & Development     Hybrid Journal   (Followers: 354)
Congress & the Presidency: A Journal of Capital Studies     Hybrid Journal   (Followers: 3)
Conjunctions. Transdisciplinary Journal of Cultural Participation     Open Access   (Followers: 2)
Constellations     Hybrid Journal   (Followers: 15)
Contemporary Italian Politics     Hybrid Journal   (Followers: 1)
Contemporary Japan     Hybrid Journal   (Followers: 5)
Contemporary Journal of African Studies     Full-text available via subscription   (Followers: 3)
Contemporary Political Theory     Hybrid Journal   (Followers: 33)
Contemporary Review of the Middle East     Full-text available via subscription   (Followers: 3)
Contemporary Security Policy     Hybrid Journal   (Followers: 14)
Contemporary Southeast Asia: A Journal of International and Strategic Affairs     Full-text available via subscription   (Followers: 19)
Contemporary Wales     Full-text available via subscription   (Followers: 3)
Contenciosa     Open Access  
Contexto Internacional     Open Access  
Cooperation and Conflict     Hybrid Journal   (Followers: 13)
CQ Researcher     Full-text available via subscription   (Followers: 2)
CQ Weekly     Full-text available via subscription  
Criterio Jurídico     Open Access  
Critical Asian Studies     Hybrid Journal   (Followers: 12)
Critical Review : A Journal of Politics and Society     Hybrid Journal   (Followers: 17)
Critical Review of International Social and Political Philosophy     Hybrid Journal   (Followers: 17)
Critical Reviews on Latin American Research     Open Access   (Followers: 3)
Critical Social Policy     Hybrid Journal   (Followers: 32)
Critical Studies on Terrorism     Hybrid Journal   (Followers: 27)
Cuadernos de historia de España     Open Access   (Followers: 3)
Cultura de Paz     Open Access  
Cultural Critique     Full-text available via subscription   (Followers: 8)
Culture Mandala : The Bulletin of the Centre for East-West Cultural and Economic Studies     Open Access  
Décalages : An Althusser Studies Journal     Open Access  
Decolonization : Indigeneity, Education & Society     Open Access   (Followers: 8)
Defence Studies     Hybrid Journal   (Followers: 22)
Defense & Security Analysis     Hybrid Journal   (Followers: 19)
Democracy & Education     Open Access   (Followers: 13)
Democratic Communiqué     Open Access   (Followers: 1)
Democratic Theory     Full-text available via subscription   (Followers: 4)
Democratization     Hybrid Journal   (Followers: 31)
Democrazia e diritto     Full-text available via subscription   (Followers: 1)
Demokratie und Geschichte     Hybrid Journal  
Demokratizatsiya: The Journal of Post-Soviet Democratization     Full-text available via subscription   (Followers: 8)
Der Donauraum     Hybrid Journal  
Der Staat     Full-text available via subscription   (Followers: 13)
Desafíos     Open Access  
Development and Change     Hybrid Journal   (Followers: 45)
Digest of Middle East Studies     Hybrid Journal   (Followers: 11)
Diplomacy & Statecraft     Hybrid Journal   (Followers: 9)
Diplomatic History     Hybrid Journal   (Followers: 18)
Diritto, immigrazione e cittadinanza     Open Access   (Followers: 4)
Dissent     Full-text available via subscription   (Followers: 6)
Diversité urbaine     Full-text available via subscription   (Followers: 1)
Dynamics of Asymmetric Conflict: Pathways toward terrorism and genocide     Hybrid Journal   (Followers: 13)
East European Jewish Affairs     Hybrid Journal   (Followers: 13)
East European Politics     Hybrid Journal   (Followers: 10)
Economia Politica     Hybrid Journal   (Followers: 35)
Ecopolítica     Open Access  
eJournal of eDemocracy and Open Government     Open Access   (Followers: 8)
El Cotidiano     Open Access   (Followers: 1)
Electoral Studies     Hybrid Journal   (Followers: 28)
Em Pauta : Teoria Social e Realidade Contemporânea     Open Access  
Encuentro     Open Access  
Environmental Politics     Hybrid Journal   (Followers: 13)
Equal Opportunities International     Hybrid Journal   (Followers: 3)
Espacios Públicos     Open Access  
Estudios Políticos     Open Access  
Estudios Políticos     Open Access  
Estudos Avançados     Open Access  
Ethical Theory and Moral Practice     Hybrid Journal   (Followers: 18)
Ethics & Global Politics     Open Access   (Followers: 6)
Ethics in Science and Environmental Politics     Hybrid Journal  
Éthique publique     Open Access  
Études internationales     Full-text available via subscription   (Followers: 1)
Eureka Street     Full-text available via subscription   (Followers: 4)
Europe's World     Open Access   (Followers: 1)
European Integration Studies     Open Access   (Followers: 9)
European Journal of American Culture     Hybrid Journal   (Followers: 2)
European Journal of Government and Economics     Open Access   (Followers: 5)
European Journal of International Relations     Hybrid Journal   (Followers: 50)
European Journal of Political Economy     Hybrid Journal   (Followers: 43)
European Journal of Political Research     Hybrid Journal   (Followers: 66)

        1 2 3 4 | Last

Journal Cover British Journal of Political Science
  [SJR: 2.505]   [H-I: 63]   [144 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0007-1234 - ISSN (Online) 1469-2112
   Published by Cambridge University Press Homepage  [24 journals]
  • Autocratic Legislatures and Expropriation Risk
    • Authors: Wilson; Matthew, Wright, Joseph
      Pages: 1 - 17
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • JPS volume 47 issue 1 Cover and Front matter
    • Pages: 1 - 2
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • JPS volume 47 issue 1 Cover and Back matter
    • Pages: 1 - 2
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Destined for Democracy' Labour Markets and Political Change in
           Colonial British America
    • Authors: Nikolova; Elena
      Pages: 19 - 45
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Central Bank Independence and Fiscal Policy: Can the Central Bank Restrain
           Deficit Spending'
    • Authors: Bodea; Cristina, Higashijima, Masaaki
      Pages: 47 - 70
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Contingent Democratization: When Do Economic Crises Matter'
    • Authors: Tang; Min, Huhe, Narisong, Zhou, Qiang
      Pages: 71 - 90
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Why Does Alejandro Know More about Politics than Catalina' Explaining
           the Latin American Gender Gap in Political Knowledge
    • Authors: Fraile; Marta, Gomez, Raul
      Pages: 91 - 112
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Is Belief in Conspiracy Theories Pathological' A Survey Experiment on
           the Cognitive Roots of Extreme Suspicion
    • Authors: Radnitz; Scott, Underwood, Patrick
      Pages: 113 - 129
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • The Incumbency Bonus Revisited: Causes and Consequences of Media Dominance
    • Authors: Green-Pedersen; Christoffer, Mortensen, Peter, Thesen, Gunnar
      Pages: 131 - 148
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Is Proportional Representation More Favourable to the Left' Electoral
           Rules and Their Impact on Elections, Parliaments and the Formation of
           Cabinets
    • Authors: Döring; Holger, Manow, Philip
      Pages: 149 - 164
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Inclusion, Dispersion, and Constraint: Powersharing in the World¯™s
           States, 1975¯"2010
    • Authors: Strøm; Kaare, Gates, Scott, Graham, Benjamin, Strand, HÃ¥vard
      Pages: 165 - 185
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Pulling Together: Shared Intentions, Deliberative Democracy and Deeply
           Divided Societies
    • Authors: O’Flynn; Ian
      Pages: 187 - 202
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Mass Warfare and the Welfare State ¯" Causal Mechanisms and Effects
    • Authors: Obinger; Herbert, Petersen, Klaus
      Pages: 203 - 227
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Party System Volatility in Post-Communist Europe
    • Authors: Crabtree; Charles, Golder, Matt
      Pages: 229 - 234
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Little is Known about Party System Volatility in Post-Communist Europe,
           but We Have Interesting New Methods and Data for Studying It
    • Authors: Powell; Eleanor, Tucker, Joshua
      Pages: 235 - 239
      PubDate: January 2017
      Issue No: Vol. 47, No. 1 (2017)
       
  • Effects of season and population size on pollination and reproductive
           output in a Mediterranean shrub
    • Authors: A. M. Sánchez; M. Rodríguez, M. J. Albert, A. Escudero
      PubDate: 2017-02-26T22:15:40.001818-05:
      DOI: 10.1111/plb.12550
       
  • Leaf habit does not determine the investment in both physical and chemical
           defences and pair-wise correlations between these defensive traits
    • Authors: X. Moreira; I. S. Pearse
      Pages: 354 - 359
      Abstract: Plant life-history strategies associated with resource acquisition and economics (e.g. leaf habit) are thought to be fundamental determinants of the traits and mechanisms that drive herbivore pressure, resource allocation to plant defensive traits, and the simultaneous expression (positive correlations) or trade-offs (negative correlations) between these defensive traits. In particular, it is expected that evergreen species ¯“ which usually grow slower and support constant herbivore pressure in comparison with deciduous species ¯“ will exhibit higher levels of both physical and chemical defences and a higher predisposition to the simultaneous expression of physical and chemical defensive traits.Here, by using a dataset which included 56 oak species (Quercus genus), we investigated whether leaf habit of plant species governs the investment in both physical and chemical defences and pair-wise correlations between these defensive traits.Our results showed that leaf habit does not determine the production of most leaf physical and chemical defences. Although evergreen oak species had higher levels of leaf toughness and specific leaf mass (physical defences) than deciduous oak species, both traits are essentially prerequisites for evergreenness. Similarly, our results also showed that leaf habit does not determine pair-wise correlations between defensive traits because most physical and chemical defensive traits were simultaneously expressed in both evergreen and deciduous oak species.Our findings indicate that leaf habit does not substantially contribute to oak species differences in plant defence investment.
      PubDate: 2017-01-17T03:10:34.59949-05:0
      DOI: 10.1111/plb.12537
       
  • Stoichiometric variation of halophytes in response to changes in soil
           salinity
    • Authors: X. Sun; Y. Gao, D. Wang, J. Chen, F. Zhang, J. Zhou, X. Yan, Y. Li
      Pages: 360 - 367
      Abstract: Variation in soil salt may change the stoichiometry of a halophyte by altering plant ecophysiology, and exert different influences on various plant organs, which has potentially important consequences for the nutrition of consumers as well as nutrient cycling in a saline ecosystem.Using a greenhouse pot experiment, we investigated the effect of salinity variability on the growth and stoichiometry of different organs of Suaeda glauca and Salicornia europaea ¯“ two dominant species of important ecological and economic value in the saline ecosystem.Our results showed that appropriate salt stimulated the growth of both species during the vigorous growth period, while high salt suppressed growth. Na significantly increased with increased salt in the culture, whereas concentrations of other measured elements and K:Na ratio for both species significantly decreased at low salt treatments, and became more gradual under higher salt conditions. Furthermore, with the change of salt in culture, variations in leaf (degenerated leaf for S. europaea, considered as young stem) stoichiometry, except N:P ratio, were large and less in stems (old stems for S. europaea) than in roots, reflecting physiological and biochemical reactions in the leaf in response to salt stress, supported by sharp changes in trends.These results suggest that appropriate saline conditions can enhance biological C fixation of halophytes; however, increasing salt could affect consumer health and decrease cycling of other nutrients in saline ecosystems.
      PubDate: 2017-02-26T22:15:29.476438-05:
      DOI: 10.1111/plb.12552
       
  • Effects of NaCl stress on seed germination and seedling development of
           Brassica insularis Moris (Brassicaceae)
    • Authors: A. Santo; E. Mattana, L. Frigau, A. Marzo Pastor, M. C. Picher Morelló, G. Bacchetta
      Pages: 368 - 376
      Abstract: Brassica insularis is a protected plant that grows on both coastal and inland cliffs in the western Mediterranean Basin. The objective of this study was to test if any variability exists in the salt stress response during seed germination and seedling development in this species relative to its provenance habitat.Variability among three populations in the salt stress effects on seed germination and recovery under different temperatures was evaluated. The effect of nebulisation of a salt solution on seedling development was evaluated between populations growing at different distances from the sea.Seeds of B. insularis could germinate at NaCl concentrations up to 200 mm. Seed viability was negatively affected by salt, and recovery ability decreased with increasing temperature or salinity. Inter-population variability was detected in salt response during the seed germination phase, as well as in seedling salt spray tolerance. The inland population seedlings had drastically decreased survival and life span and failed to survive to the end of the experiment. In contrast, at least 90% of the coastal seedlings survived, even when sprayed at the highest frequency with salt solution.This study allowed investigation of two natural factors, soil salinity and marine aerosols, widely present in the B. insularis habitat, and provided the first insights into ecology of this protected species and its distribution in the Mediterranean. These results might be useful in understanding the actual distributions of other species with the same ecology that experience these same abiotic parameters.
      PubDate: 2017-01-24T21:35:33.259743-05:
      DOI: 10.1111/plb.12539
       
  • Transgenic tobacco plants constitutively expressing peanut BTF3 exhibit
           increased growth and tolerance to abiotic stresses
    • Authors: V. Pruthvi; N. Rama, M. S. Parvathi, K. N. Nataraja
      Pages: 377 - 385
      Abstract: Abiotic stresses limit crop growth and productivity worldwide. Cellular tolerance, an important abiotic stress adaptive trait, involves coordinated activities of multiple proteins linked to signalling cascades, transcriptional regulation and other diverse processes. Basal transcriptional machinery is considered to be critical for maintaining transcription under stressful conditions. From this context, discovery of novel basal transcription regulators from stress adapted crops like peanut would be useful for improving tolerance of sensitive plant types.In this study, we prospected a basal transcription factor, BTF3 from peanut (Arachis hypogaea L) and studied its relevance in stress acclimation by over expression in tobacco.AhBTF3 was induced under PEG-, NaCl-, and methyl viologen-induced stresses in peanut. The constitutive expression of AhBTF3 in tobacco increased plant growth under non stress condition. The transgenic plants exhibited superior phenotype compared to wild type under mannitol- and NaCl-induced stresses at seedling level. The enhanced cellular tolerance of transgenic plants was evidenced by higher cell membrane stability, reactive oxygen species (ROS) scavenging activity, seedling survival and vigour than wild type. The transgenic lines showed better in vitro regeneration capacity on growth media supplemented with NaCl than wild type. Superior phenotype of transgenic plants under osmotic and salinity stresses seems to be due to constitutive activation of genes of multiple pathways linked to growth and stress adaptation.The study demonstrated that AhBTF3 is a positive regulator of growth and stress acclimation and hence can be considered as a potential candidate gene for crop improvement towards stress adaptation.
      PubDate: 2017-01-17T22:00:28.309722-05:
      DOI: 10.1111/plb.12533
       
  • Drought responses, phenotypic plasticity and survival of Mediterranean
           species in two different microclimatic sites
    • Authors: F. J. Bongers; M. Olmo, B. Lopez-Iglesias, N. P. R. Anten, R. Villar
      Pages: 386 - 395
      Abstract: Climate models predict a further drying of the Mediterranean summer. One way for plant species to persist during such climate changes is through acclimation. Here, we determine the extent to which trait plasticity in response to drought differs between species and between sites, and address the question whether there is a trade-off between drought survival and phenotypic plasticity.Throughout the summer we measured physiological traits (photosynthesis ¯“ Amax, stomatal conductance ¯“ gs, transpiration ¯“ E, leaf water potential ¯“ ψl) and structural traits (specific leaf area ¯“ SLA, leaf density ¯“ LD, leaf dry matter content ¯“ LDMC, leaf relative water content ¯“ LRWC) of leaves of eight woody species in two sites with slightly different microclimate (north- versus south-facing slopes) in southern Spain. Plant recovery and survival was estimated after the summer drought period.We found high trait variability between species. In most variables, phenotypic plasticity was lower in the drier site. Phenotypic plasticity of SLA and LDMC correlated negatively with drought survival, which suggests a trade-off between them. On the other hand, high phenotypic plasticity of SLA and LDMC was positively related to traits associated with rapid recovery and growth after the drought period.Although phenotypic plasticity is generally seen as favourable during stress conditions, here it seemed beneficial for favourable conditions. We propose that in environments with fluctuating drought periods there can be a trade-off between drought survival and growth during favourable conditions. When climate become drier, species with high drought survival but low phenotypic plasticity might be selected for.
      PubDate: 2017-02-01T07:07:27.58704-05:0
      DOI: 10.1111/plb.12544
       
  • Accumulation of stem sugar and its remobilisation in response to drought
           stress in a sweet sorghum genotype and its near-isogenic lines carrying
           different stay-green loci
    • Authors: T. Ghate; S. Deshpande, S. Bhargava
      Pages: 396 - 405
      Abstract: Near isogenic lines (NILs) of sweet sorghum genotype S35 into which individual stay green loci were introgressed, were used to understand the contribution of Stay green loci to stem sugar accumulation and its remobilization under drought stress exposure.Sugar and starch content, activities of sugar metabolism enzymes and levels of their expression were studied in the 3rd (source) leaf from panicle and the 5th (sugar storing) internode of the three lines, in irrigated plants and in plants exposed to a brief drought exposure at the panicle emergence stage. Annotation of genes in the respective Stay green loci introgressed in the NILs was carried out using bioinformatics tools.The leaves of NILs accumulated more photoassimilates and the internodes accumulated more sugar, as compared to the parent S35 line. Drought stress exposure led to a decrease in the starch and sugar levels in leaves of all three lines, while an increase in sugar levels was observed in internodes of the NILs. Sugar fluxes were accompanied by alterations in the activities of sugar metabolizing enzymes as well as the expression of genes related to sugar metabolism and transport.Remobilization of sugars from the stem internodes was apparent in the NILs when subjected to drought stress, since the peduncle, which supports the panicle, showed an increase in the sugar content, even when photoassimation in source leaves was reduced. Several genes related to carbohydrate metabolism were located in the Stay green loci, which probably contributed to variation in the parameters studied.
      PubDate: 2017-01-19T09:51:29.566459-05:
      DOI: 10.1111/plb.12538
       
  • Plant defence induced by PGPR against Spodoptera litura in tomato (Solanum
           lycopersicum L.)
    • Authors: A. Bano; R. Muqarab
      Pages: 406 - 412
      Abstract: The research conducted including its rationale: Spodoptera litura is the major pest of tomato causing significant reduction in tomato yield. Application of Plant growth promoting rhizobacteria(PGPR) prevent use of chemical fertilizer and synthetic pesticides through enhancement of plant growth and yield and induction of systemic resistance. Present investigation is an attempt to evaluate the role of PGPR, Pseudomonas putida and Rothia sp. on the physiology and yield of tomato fruit infested with the S. litura.Central methods applied: The surface sterilized seeds of tomato were inoculated with 48 h culture of P. putida and Rothia sp. At 6¯“7 branching stage of the plant, the larvae of S. litura at 2nd in star was used to infect the tomato plant leaves.Key results: The S. litura infestation decreased dry weight of shoots and roots by 46% and 22%, and significant reduction was recorded in tomato fruit yield. The P. putida and Rothia sp. inoculations alleviated the adverse effects of insect infestation and resulted in 60% increase in plant biomass and 40% increase in yield over infested plants.Main conclusions including key points of discussion: PGPR: Defense appears to be mediated via increase in proline production, enhanced activities of antioxidant enzymes, stimulation in the activities of protease and polyphenol oxidases, increased contents of phenolics, protein and chlorophyll. The formulation of biopesticide involving PGPR comprise an environment friendly and sustainable approach to overcome insect infestation.
      PubDate: 2017-01-19T09:51:35.480381-05:
      DOI: 10.1111/plb.12535
       
  • Shade tolerance and herbivory are associated with RGR of tree species via
           different functional traits
    • Authors: C. Salgado-Luarte; E. Gianoli
      Pages: 413 - 419
      Abstract: Relative growth rate (RGR) plays an important role in plant adaptation to the light environment through the growth potential/survival trade-off. RGR is a complex trait with physiological and biomass allocation components. It has been argued that herbivory may influence the evolution of plant strategies to cope with the light environment, but little is known about the relation between susceptibility to herbivores and growth-related functional traits.Here, we examined in 11 evergreen tree species from a temperate rainforest the association between growth-related functional traits and (i) species¯™ shade-tolerance, and (ii) herbivory rate in the field. We aimed at elucidating the differential linkage of shade and herbivory with RGR via growth-related functional traits.We found that RGR was associated negatively with shade-tolerance and positively with herbivory rate. However, herbivory rate and shade-tolerance were not significantly related. RGR was determined mainly by photosynthetic rate (Amax) and specific leaf area (SLA). Results suggest that shade tolerance and herbivore resistance do not covary with the same functional traits. Whereas shade-tolerance was strongly related to Amax and to a lesser extent to leaf mass ratio (LMR) and dark respiration (Rd), herbivory rate was closely related to allocation traits (SLA and LMR) and slightly associated with protein content.The effects of low light on RGR would be mediated by Amax, while the effects of herbivory on RGR would be mediated by SLA. Our findings suggest that shade and herbivores may differentially contribute to shape RGR of tree species through their effects on different resource-uptake functional traits.
      PubDate: 2017-01-05T08:10:29.990202-05:
      DOI: 10.1111/plb.12534
       
  • Temporal, but not spatial, changes in expression patterns of petal
           identity genes are associated with loss of papillate conical cells and the
           shift to bird pollination in Macaronesian Lotus (Leguminosae)
    • Authors: D. I. Ojeda; R. Jaén-Molina, A. Santos-Guerra, J. Caujape-Castells, Q. Cronk
      Pages: 420 - 427
      Abstract: In the generally bee-pollinated genus Lotus a group of four species have evolved bird-pollinated flowers. The floral changes in these species include altered petal orientation, shape and texture. In Lotus these characters are associated with dorsiventral petal identity, suggesting that shifts in the expression of dorsal identity genes may be involved in the evolution of bird pollination. Of particular interest is Lotus japonicus CYCLOIDEA 2 (LjCYC2), known to determine the presence of papillate conical cells on the dorsal petal in L. japonicus. Bird-pollinated species are unusual in not having papillate conical cells on the dorsal petal.Using RT-PCR at various stages of flower development, we determined the timing of expression in all petal types for the three putative petal identity genes (CYC-like genes) in different species with contrasting floral morphology and pollination syndromes.In bird-pollinated species the dorsal identity gene, LjCYC2, is not expressed at the floral stage when papillate conical cells are normally differentiating in bee-pollinated species. In contrast, in bee-pollinated species, LjCYC2 is expressed during conical cell development.Changes in the timing of expression of the above two genes are associated with modifications in petal growth and lateralisation of the dorsal and ventral petals in the bird-pollinated species. This study indicates that changes in the timing, rather than spatial distribution, of expression likely contribute to the modifications of petal micromorphology and petal size during the transition from bee to bird pollination in Macaronesian Lotus species.
      PubDate: 2017-02-26T22:15:35.693994-05:
      DOI: 10.1111/plb.12551
       
 
 
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