for Journals by Title or ISSN
for Articles by Keywords
help

Publisher: SciELO   (Total: 737 journals)

 A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  

  First | 1 2 3 4        [Sort by number of followers]   [Restore default list]

Showing 601 - 737 of 737 Journals sorted alphabetically
Revista Facultad de Medicina de la Universidad Nacional de Colombia     Open Access   (SJR: 0.125, CiteScore: 0)
Revista Facultad Nacional de Agronomía, Medellín     Open Access   (SJR: 0.138, CiteScore: 0)
Revista Facultad Nacional de Salud Pública     Open Access  
Revista Gaúcha de Enfermagem     Open Access   (SJR: 0.225, CiteScore: 1)
Revista Geológica de América Central     Open Access  
Revista Geológica de Chile     Open Access   (Followers: 1)
Revista Gerencia y Políticas de Salud     Open Access   (SJR: 0.136, CiteScore: 0)
Revista Habanera de Ciencias Médicas     Open Access   (SJR: 0.211, CiteScore: 0)
Revista Historia y Sociedad     Open Access  
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access   (Followers: 1, SJR: 0.204, CiteScore: 0)
Revista Ingenierías Universidad de Medellín     Open Access  
Revista Integra Educativa     Open Access  
Revista Interamericana de Bibliotecología     Open Access   (Followers: 7)
Revista Internacional de Contaminación Ambiental     Open Access   (SJR: 0.152, CiteScore: 0)
Revista ION     Open Access  
Revista IUS     Open Access  
Revista Katálysis     Open Access  
Revista Lasallista de Investigación     Open Access   (SJR: 0.146, CiteScore: 0)
Revista Latino-Americana de Enfermagem     Open Access   (SJR: 0.339, CiteScore: 1)
Revista Latinoamericana de Bioética     Open Access  
Revista Latinoamericana de Desarrollo Económico     Open Access  
Revista Latinoamericana de Filosofía     Open Access   (Followers: 1)
Revista Latinoamericana de Investigación en Matemática Educativa     Open Access   (SJR: 0.171, CiteScore: 0)
Revista Latinoamericana de Psicopatologia Fundamental     Open Access   (SJR: 0.201, CiteScore: 0)
Revista Medica de Chile     Open Access   (SJR: 0.259, CiteScore: 1)
Revista Médica del Hospital Nacional de Niños Dr. Carlos Sáenz Herrera     Open Access   (Followers: 1)
Revista Médica Electrónica     Open Access  
Revista Médica La Paz     Open Access  
Revista Mexicana de Análisis de la Conducta     Open Access   (SJR: 0.405, CiteScore: 1)
Revista Mexicana de Astronomía y Astrofísica     Open Access   (Followers: 2, SJR: 0.596, CiteScore: 1)
Revista Mexicana de Biodiversidad     Open Access   (SJR: 0.421, CiteScore: 1)
Revista Mexicana de Ciencias Agrícolas     Open Access   (Followers: 1)
Revista Mexicana de Ciencias Geológicas     Open Access   (SJR: 0.308, CiteScore: 1)
Revista Mexicana de Ciencias Pecuarias     Open Access   (Followers: 1, SJR: 0.17, CiteScore: 0)
Revista Mexicana de Economía y Finanzas     Open Access  
Revista Mexicana de Física     Open Access   (SJR: 0.203, CiteScore: 0)
Revista mexicana de física E     Open Access  
Revista Mexicana de Fitopatología     Open Access  
Revista Mexicana de Ingeniería Química     Open Access   (SJR: 0.328, CiteScore: 1)
Revista Mexicana de Investigación Educativa     Open Access   (Followers: 3, SJR: 0.291, CiteScore: 0)
Revista Mexicana de Micologí­a     Open Access  
Revista Mexicana de Sociologí­a     Open Access   (Followers: 9, SJR: 0.142, CiteScore: 0)
Revista Musical Chilena     Open Access   (SJR: 0.1, CiteScore: 0)
Revista MVZ Córdoba     Open Access   (SJR: 0.173, CiteScore: 0)
Revista Odonto Ciência     Open Access   (SJR: 0.101, CiteScore: 0)
Revista Opinión Jurídica     Open Access  
Revista Panamericana de Salud Pública     Open Access   (SJR: 0.452, CiteScore: 1)
Revista Paulista de Pediatria     Open Access   (SJR: 0.472, CiteScore: 1)
Revista Perspectivas     Open Access  
Revista Pilquen : Sección Ciencias Sociales     Open Access  
Revista Portuguesa de Cirurgia     Open Access   (Followers: 1)
Revista Portuguesa de Enfermagem de Saúde Mental     Open Access  
Revista Portuguesa de Imunoalergologia     Open Access   (Followers: 2, SJR: 0.141, CiteScore: 0)
Revista Portuguesa de Ortopedia e Traumatologia     Open Access  
Revista Portuguesa de Saúde Pública     Open Access   (SJR: 0.155, CiteScore: 0)
Revista Portuguesa e Brasileira de Gestão     Open Access  
Revista Signos     Open Access   (SJR: 0.174, CiteScore: 0)
Revista Universitaria de Geografía     Open Access  
Revista Uruguaya de Cardiologia     Open Access  
Revista Veterinaria     Open Access   (SJR: 0.105, CiteScore: 0)
RGO : Revista Gaúcha de Odontologia     Open Access   (SJR: 0.104, CiteScore: 0)
RISTI : Revista Ibérica de Sistemas e Tecnologias de Informação     Open Access   (SJR: 0.213, CiteScore: 1)
RLA : revista de linguistica teorica y aplicada     Open Access   (Followers: 1, SJR: 0.192, CiteScore: 0)
Rodriguésia     Open Access   (SJR: 0.734, CiteScore: 2)
SA Orthopaedic J.     Open Access   (Followers: 2)
Salud Colectiva     Open Access   (SJR: 0.22, CiteScore: 0)
Salud Mental     Open Access   (Followers: 1, SJR: 0.173, CiteScore: 1)
Sanidad Militar     Open Access  
São Paulo em Perspectiva     Open Access  
Sao Paulo Medical J.     Open Access   (SJR: 0.334, CiteScore: 1)
Saúde e Sociedade     Open Access   (SJR: 0.384, CiteScore: 0)
Saúde em Debate     Open Access  
Sba: Controle & Automação Sociedade Brasileira de Automatica     Open Access  
Scientia Agricola     Open Access   (SJR: 0.578, CiteScore: 2)
Scientiae Studia     Open Access  
Secuencia     Open Access   (SJR: 0.101, CiteScore: 0)
Serviço Social & Sociedade     Open Access   (Followers: 1)
Sexualidad, Salud y Sociedad (Rio de Janeiro)     Open Access   (Followers: 2)
Si Somos Americanos     Open Access  
Signos Filosóficos     Open Access   (SJR: 0.107, CiteScore: 0)
Silva Lusitana     Open Access  
Sociedade & Natureza     Open Access  
Sociedade e Estado     Open Access   (Followers: 2, SJR: 0.127, CiteScore: 0)
Sociologia : Revista da Faculdade de Letras da Universidade do Porto     Open Access  
Sociologias     Open Access   (Followers: 2, SJR: 0.15, CiteScore: 0)
Sociológica     Open Access   (Followers: 2)
Soldagem & Inspeção     Open Access   (SJR: 0.238, CiteScore: 0)
South African Dental J.     Open Access  
South African J. of Agricultural Extension     Open Access   (Followers: 4)
South African J. of Animal Science     Open Access   (Followers: 3, SJR: 0.387, CiteScore: 1)
South African J. of Childhood Education     Open Access   (Followers: 1)
South African J. of Enology and Viticulture     Open Access   (SJR: 0.301, CiteScore: 1)
South African J. of Industrial Engineering     Open Access   (Followers: 3, SJR: 0.201, CiteScore: 1)
South African J. of Occupational Therapy     Open Access   (Followers: 39)
South African J. of Surgery     Open Access   (Followers: 1, SJR: 0.162, CiteScore: 0)
South African Medical J.     Open Access   (Followers: 5, SJR: 0.45, CiteScore: 1)
Studia Historiae Ecclesiasticae     Open Access   (Followers: 3)
Summa Phytopathologica     Open Access   (SJR: 0.258, CiteScore: 0)
Tecnología Química     Open Access  
Tecnología y Ciencias del Agua     Open Access   (SJR: 0.153, CiteScore: 0)
Temas y Debates     Open Access  
Tempo     Open Access   (Followers: 2, SJR: 0.103, CiteScore: 0)
Tempo Social     Open Access   (Followers: 2, SJR: 0.135, CiteScore: 0)
Teología y Vida     Open Access   (Followers: 1, SJR: 0.122, CiteScore: 0)
Terapia Psicológica     Open Access   (SJR: 0.394, CiteScore: 1)
Texto & Contexto - Enfermagem     Open Access   (SJR: 0.273, CiteScore: 1)
The European J. of Psychiatry (edicion en español)     Open Access   (Followers: 1)
Theologica Xaveriana     Open Access   (SJR: 0.14, CiteScore: 0)
Tinkazos     Open Access  
Tópicos del seminario     Open Access   (Followers: 1)
Toxicodependências     Open Access  
Trabalho, Educação e Saúde     Open Access  
Trabalhos em Linguistica Aplicada     Open Access  
Trans/Form/Ação - Revista de Filosofia     Open Access   (SJR: 0.1, CiteScore: 0)
Transinformação     Open Access   (Followers: 1, SJR: 0.192, CiteScore: 0)
Trends in Psychiatry and Psychotherapy     Open Access   (Followers: 9, SJR: 0.323, CiteScore: 1)
Tydskrif vir Geesteswetenskappe     Open Access   (SJR: 0.193, CiteScore: 0)
Tydskrif vir Letterkunde     Open Access   (SJR: 0.235, CiteScore: 0)
Ultima Década     Open Access  
Universidad y Ciencia     Open Access   (Followers: 1)
Universitas Medica     Open Access   (Followers: 1)
Universitas Philosophica     Open Access  
Universitas Scientiarum     Open Access   (SJR: 0.192, CiteScore: 1)
Universum : Revista de Humanidades y Ciencias Sociales     Open Access   (Followers: 1, SJR: 0.155, CiteScore: 0)
Vaccimonitor     Open Access   (Followers: 1, SJR: 0.177, CiteScore: 0)
Varia Historia     Open Access   (SJR: 0.152, CiteScore: 0)
Veritas : Revista de Filosofí­a y Teología     Open Access   (Followers: 1, SJR: 0.101, CiteScore: 0)
Veterinaria (Montevideo)     Open Access  
Veterinaria México     Open Access  
Vibrant : Virtual Brazilian Anthropology     Open Access  
Visión de futuro     Open Access  
Vniversitas     Open Access   (SJR: 0.16, CiteScore: 0)
Water SA     Open Access   (Followers: 2, SJR: 0.361, CiteScore: 1)
West Indian Medical J.     Open Access   (Followers: 1, SJR: 0.174, CiteScore: 0)
Yesterday and Today     Open Access   (Followers: 1)
Zoologia (Curitiba)     Open Access  

  First | 1 2 3 4        [Sort by number of followers]   [Restore default list]

Similar Journals
Journal Cover
South African Journal of Enology and Viticulture
Journal Prestige (SJR): 0.301
Citation Impact (citeScore): 1
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0253-939X - ISSN (Online) 2224-7904
Published by SciELO Homepage  [737 journals]
  • Cost-effective Ultrasonic Extraction of Bioactive Polyphenols from Vine
           and Wine Waste in Serbia

    • Abstract: By using cost-effective ultrasonic extraction techniques, bioactive phenolic extracts were obtained from Merlot and Vranac (Vitis vinifera L.) vine and wine waste produced in Serbian wineries. These wastes include vine leaves, grape pomace, seeds, skins and stems, which can find further use in the food and pharmacology industries as preservatives against microbes. The extracts showed strong scavenging free radical activity (EC50 from 0.37 to 2.02 mg/L), which was in very good correlation with the total polyphenol content. Strong antimicrobial activity was found against six Gram-positive and five Gram-negative bacterial strains, and against the yeast Candida albicans. The principal component and agglomerative hierarchical clustering analyses performed were shown to be good for grouping and distinguishing the results from the vine and wine by-products (leaves and seeds) from both investigated grape varieties based on the content of various polyphenolic classes, and antioxidant and antimicrobial activities. The valorisation of the grape by-products is consistent with the concept of a sustainable and environmentally oriented wine industry and provides an important economic advantage.
       
  • Nitrogen and Sulphur Foliar Fertilisation

    • Abstract: The effects of fertilisation can reverberate from grapes through to wines. In wine, non-volatile compounds mainly influence the taste and flavour of wines, while volatile compounds play an important role in the aromatic expression. This review includes information on the presence of non-volatile and volatile compounds reportedly affected by nitrogen and sulphure foliar fertilisation, (bio)synthesis, and evolution throughout winemaking, their chemical properties, and their implications. The second part presents the status of the research on elucidating the influence and contribution of foliar fertilisation practices on the chemical compounds throughout winemaking, from the grape to the wine.
       
  • Survival of vine mealybug, Planococcus ficus (Signoret) (Hemip-tera:
           Pseudococcidae), on grapevine root remnants in soil in the Western Cape
           Province, South Africa

    • Abstract: Grapevine leafroll is the most damaging grapevine virus disease in South Africa, and the primary vector of Grapevine leafroll-associated virus 3 (GLRaV-3) is vine mealybug, Planococcus ficus (Signoret). Preventing re-infection of newly planted, virus-free grapevines is critical to control and prevent the spread of leafroll disease. Results from a previous survey raised concern that mealybugs surviving on leafroll-infected root remnants in the soil could transmit the virus to newly planted grapevines. This study aimed to determine if P. ficus commonly occurs on grapevine roots in the Western Cape Province of South Africa, if and for how long it can survive on remnant roots in soil, and if it can transmit GLRaV-3 to healthy grapevines after surviving on remnant roots. Surveys to determine the occurrence of mealybugs on grapevine roots were conducted at different times of the growing season in vineyards near Robertson, McGregor, Montagu, Somerset West and Malmesbury over three seasons. A field trial was conducted on a sand-clay-loam soil with 23% clay and a sandy-loam soil with 10% clay over 12 months to determine survival of different life stages of vine mealybug confined on root sections from leafroll-infected Pinotage/R110 grapevines. Results indicate that P. ficus does not readily occur on grapevine roots in the Western Cape, and that it does not survive well on root remnants of grapevines for any length of time. Implications for planting virus-free grapevines in soil where leafroll-infected vines were removed, are discussed.
       
  • Grape Must Profiling And Cultivar Discrimination Based On Amino Acid
           Composition And General Discriminant Analysis With Best Subset

    • Abstract: The present study aimed to elucidate the amino acid profile of a number of grapevine cultivars relevant to the South African wine industry using 738 grape must samples obtained during the 2016 and 2017 harvests. Proline and arginine were found to be the most abundant amino acids, with an average of 697.69 mg/L for proline (range 33.22-3445.43 mg/L) and 388.35 mg/L for arginine (range 13.56-1616.56 mg/L) across all vintages, regions, and cultivars. At the other extreme, ornithine (2.01 mg/L), glycine (3.28 mg/L), methionine (3.64 mg/L) and lysine (3.91 mg/L) were found to have the lowest concentrations, both in terms of the overall average, as well as per cultivar. Furthermore, the data were used to demonstrate how characteristic the amino acid profile is of a particular group (red or white) or cultivar. Cultivars were predicted based on their average amino acid concentrations using general discriminant analysis (GDA) and the best subset principle. For white musts, Chardonnay showed the highest prediction accuracy (100%), and Pinotage (75%) for red cultivars. Overall, the white cultivars included in this study were more accurately distinguished from one another (75.6%) compared to the red (60.1%). This predictive ability was subsequently compared to the accuracy of predicting cultivars based on only the arginine and proline concentrations as well as the ratio between the two. The use of only these amino acids as well as the addition of the proline/arginine ratio as a predictor variable did not offer satisfactory discriminatory power between either white or red cultivars.
       
  • Modulation of Yeast-Derived Volatile Aromas by Oleic Acid and
           Sterols

    • Abstract: Unsaturated fatty acids and sterols are essential constituents of the yeast plasma membrane. Recently, their contribution to modulating the production of yeast-derived volatile compounds has received significant attention. The objective of this study was to determine how sterol and lipid supplementation, including ergosterol, plant sterols or oleic acid, differentially influenced yeast growth as well as the production of fermentative aromas when added individually or in combinations. Oleic acid significantly altered the volatile profiles produced and lowered yeast growth. Generally, phytosterol (β-sitosterol) and ergosterol supplementation resulted in similar responses regarding the production of aromas, however, they differed in the magnitude of the response in the case of medium chain fatty acids and acetate esters synthesis. The combinations of sterols with oleic acid resulted in a response more closely associated with the oleic acid control treatment, showing lower levels of acetate ester production.
       
  • Recent Developments in Seedless Grapevine Breeding

    • Abstract: Grapes are one of the most commonly produced fruit crops in the world and are consumed as table grapes, wine grapes and dried grapes. In line with consumer demands, seedlessness continues to be an important feature that increases the chances of marketing grapes. Nearly all of the dried grapes that are offered to the world markets are seedless grapes. In addition, the demand for seedless varieties has increased steadily in the table grape trade over the years. Therefore, the production of new seedless grape varieties with large berries that are suitable for table consumption is one of the important goals of breeding studies in viticulture. In this study, recently bred and released new seedless grape varieties are briefly introduced, seedless grape breeding methods are summarised, and the latest developments in breeding methods are explained.
       
  • The Impact of Different Tannin to Anthocyanin Ratios and of Oxygen on the
           Phenolic Polymerisation Over Time in a Wine-like Solution

    • Abstract: Colour and phenolic stability during ageing are influenced by the levels of distinct classes of phenolics in young red wines. The ratios between different classes of phenolic compounds also determine the colour and phenolic development of red wines. The present study evaluated the impact of forced oxidation on different anthocyanin/tannin (A/T) extracts and its consequent effect on the colour and phenolic evolution over time. The results showed that higher contents of seed tannins could enhance phenolic polymer formation, especially in the presence of oxygen. The addition of oxygen seemed to favour certain polymerisation reactions between tannins, leading to higher concentrations of monomeric anthocyanins in solution. A slower oxygen consumption was also observed as the phenolic composition of the wine-like extract evolved over time.
       
  • Hydric behaviour and gas exchange in different grapevine varieties (Vitis
           vinifera L.) from the Maule Valley (Chile)

    • Abstract: In the near future, stomatal behaviour will be crucial to counteract conditions arising from climate change. Grapevine varieties are classified as either isohydric or anisohydric, depending on the sensitivity of sto-mata to water deficit and on their water potential homeostasis. However, the great variability observed in different studies indicates that a continuum exists in the range of stomatal sensitivity to water stress. Thus, more knowledge about the hydric behaviour and the gas exchange of isohydric and anisohydric grapevine varieties under different water conditions could lead to the development of irrigation strategies oriented at improving water-use efficiency, yield and berry composition. In this study, research was conducted in order to characterise the stomatal regulation of four different Vitis vinifera L. varieties, namely Pinot noir, Sauvignon blanc, Chardonnay and Merlot, according to soil water status. Measurements of leaf gas exchange, together with measurements of stem water potential (Ψ$) and leaf water potential (Ψ1), were taken during two seasons. Under conditions of water stress, Chardonnay and Merlot reached a minimum Ψ$ of -1.67 and -1.68 MPa respectively, and higher levels of water-use efficiency (A N/g), of 62.3 and 69.7 μmol C0(2/)mol H(2)0 respectively. In Sauvignon blanc and Pinot noir, the minimum Ψ$ was -1.26 and -1.40 MPa respectively, with lower levels of A N/g s (53.1 and 50.5 μmol C0(2/)mol H(2)0, respectively). Under conditions of water stress (Ψ1 < -0.9 MPa and *Fs < -0.6 MPa), all varieties had a significantly increased A^g¹, despite a significant reduction in gas exchange. Therefore, the hydric behaviour and gas exchange observed in this study suggest that Chardonnay and Merlot could be characterised as anisohydric varieties, as they present less sensitive stomatal control, while Pinot noir can be classified as a near-anisohydric variety and Sauvignon blanc as an isohydric variety. New investigations should consider other characteristics of the varieties to classify them better.
       
  • Profiling Potentially Smoke Tainted Red Wines: Volatile Phenols and
           Aroma Attributes

    • Abstract: Malodourous compounds, including volatile phenols (VPs) are frequently found at concentrations below their odour thresholds in wine, and may therefore be considered to present no threat to wine quality. Most investigations into smoke taint quantify compounds by chemical/analytical means, or investigate sensory effects of supra- and peri-threshold contamination in model wine. In this project, twelve wines (submitted by the South African industry as potentially smoke tainted) were screened for VPs using GC-MS, and characterized using descriptive analysis (DA) by a sensory panel highly trained in smoke taint evaluation. Results were compared statistically to elucidate relationships between chemical and sensory characteristics. It was demonstrated, using the combined dataset that concentration and composition of VPs in the wines correlated well with certain sensory attributes. Guaiacol was present in most samples at peri- or supra-threshold levels, but was not correlated with taint unless in combination with other phenols, in which case it was associated with 'smoky', 'ashy' and 'herbaceous' attributes. Wines with supra-threshold levels of VPs showed negative attributes ('chemical / plastic', 'tar / BR' and 'medicinal / Elastoplast™'). In some cases, sensory effects ('earthy / dusty / potato skin', 'mouldy / musty' and 'cooked vegetables (veg.)') could not be attributed to supra-threshold VP contamination, and therefore seemed to be due to combinations of VPs at subthreshold levels. Associations between negative attributes and historical bushfire events prior to harvest were found for a number of the wines. This study emphasizes the importance of understanding effects of VPs on wine aroma, and escalating awareness and sensitivity to these issues in the wine industry.
       
  • Response of Soil Chemical Properties to Irrigation with Winery Wastewater
           on a Well-drained Sandy Soil

    • Abstract: Most wineries in South Africa dispose of their wastewater through land application. This is carried out by irrigating small areas of cultivated pasture with the wastewater or ponding, with the former being the more general practice. Land application of winery wastewater results in the accumulation of potassium (K+) and sodium (Na+) in the soil and leaching of calcium (Ca²+) and magnesium (Mg²+).This could lead to long term instability of soil structure. The objective of this study was to investigate the effect of irrigation with winery wastewater on chemical soil properties and potential environmental impacts. Therefore, an existing grazing paddock at a winery near Rawsonville was selected where wastewater had been applied for many years. Due to the high volumes of wastewater irrigation plus rainfall, the inevitable over-irrigation leached large amounts of cations, particular K+ and Na+, beyond 90 cm soil depth at the selected study site. These leached elements are likely to end up in natural water resources in the long run. Irrigation with winery wastewater did not have a pronounced effect on soil pH(KCl). This was probably due to the decomposition of organic matter, and the fact that the applied salts were leached beyond 90 cm depth. The study confirmed that disposal of winery wastewater through land application can only be recommended where wastewater application will not exceed the water requirement of the crop as well as the water holding capacity of the soil which is being irrigated.
       
  • Effects of Different Harvest Times on the Maturity of Polyphenols in Two
           Red Wine Grape Cultivars (Vitis vinifera L . ) in Qingtongxia (China)

    • Abstract: Due to the special climate conditions in the Qingtongxia region, grapes are high in sugar and low in titratable acidity from the stages of ripening. Therefore, the common methods used for determining the maturity of grapes, which depend on the ratio of sugar and titratable acidity in other regions, are inappropriate in Qingtongxia. This research was done in order to seek for a simple and convenient method of determining the optimal harvest time of grapes, further providing some theoretical basis for improving the quality of wine in Qingtongxia. Phenolic contents and some basic physico-chemical parameters of Merlot and Pinot Noir were evaluated during different ripening stages. The results showed that a different harvest time significantly affects the phenolic contents and physico-chemical parameters of Merlot and Pinot Noir. The total contents of anthocyanins in skins and total contents of phenolic in seeds was screen out as two important indexes to evaluate the maturity of polyphenols, in order to better improve the quality of grape and wine.
       
  • UV Light Acclimation Capacity of Leaf Photosynthetic and Photochemical
           Behaviour in Near-isohydric and Anisohydric Grapevines in Hot and Dry
           Environments

    • Abstract: The photosynthetic and photochemical adaptation of grapevine leaves to high UV radiation, under hot and dry summer conditions, was investigated in near-isohydric Cannonau (syn. Grenache) and near-anisohydric Bovale grande (syn. Carignan). From pea-size stage until harvest, vines with mild to moderate water deficit were subjected to UV-blocking treatment (-UV) and compared to a control exposed to sunlight (C). Canopy light and thermal microclimate, growth and density, maximum leaf gas exchange, primary photochemistry (PSII) and phenols were monitored. Average increments in canopy temperature under -UV tunnels during day-time and night-time were 3.3°C and 0.8°C in Bovale grande and 2.6°C and 1.1°C in Cannonau. Cultivars reached similar leaf area, intrinsic water-use efficiency and stem water potential under C and -UV. Cannonau showed lower stomatal conductance, maximum net assimilation and transpiration rates, but also faster recovery of PSII under heat and moderate water stress. UV radiation induced a stronger and longer impact on leaf assimilation, but the duration of elevated temperatures under -UV induced higher photoinhibition and lower photochemical efficiency. A similar degree of correlation between leaf temperature and gas exchange was found among cultivars and treatments. In Cannonau, leaf anthocyanin decreased due to heat-induced long-lasting PSII photoinactivation under C. Conversely, Bovale grande showed higher phenolic content stability, thus higher photoprotection and recovery of PSII functional units. Agronomical practices affecting leaf phenolic accumulation influence canopy acclimation to heat and high sunlight. Vineyard management must avoid excessive canopy sun exposure and duration of elevated temperatures to favour high assimilation, while reducing photoinactivation and heat damage.
       
  • Potential of South African entomopathogenic nematodes to control the leaf
           miner, Holocacista capensis (Lepidoptera: Heliozelidae)

    • Abstract: The Cape grapevine leafminer, Holocacista capensis, a sporadic pest of economic importance, is found in South African table and wine grape vineyards. The cocoon casings, constructed by the final instar larvae, can be found attached to grape bunches, posing a phytosanitary risk for table grape export markets. The current study aimed to determine the susceptibility of leaf-mining H. capensis larvae to seven entomopathogenic nematode (EPN) species belonging to Steinernematidae and Heterorhabditidae. To determine nematode virulence occupied leaf-mining galleries were extracted from infested leaves and inoculated with 200 infective juveniles (IJs) in 50 μ! of distilled water, for each of the EPNs screened. Concentration assays were conducted and and lethal dose was determined for the three most virulent species (Heterorhabditis baujardi, H. indica and H. noenieputensis), using concentrations of 0, 25, 50, 100, 200, and 400 IJs/leaf-mining larva. High mortality of leaf-mining larvae was obtained with H. baujardi (92%), H. noenieputensis (85%) and H. indica (83%). Almost double the number of H. noenieputensis (34 nematodes/insect) penetrated the insect larvae, in comparison with the other two EPNs. However, the relative potency of H. baujardi was 3.56 times higher than for H. indica, whilst that of H. indica was 2.57 times higher than it was for H. noenieputensis. The results obtained in the laboratory were found to be encouraging, especially with regard to the nematodes' ability to penetrate the leaf-mining galleries, and to infect the larvae successfully.
       
  • Editorial Letter

    •  
  • Chemical and Sensorial Characterization of Tropical Syrah Wines Produced
           at Different Altitudes in Northeast of the Brazil

    • Abstract: Over the years, viticulture has expanded to new regions outside the temperate zones, such as Northeast Brazil, India, Thailand, Myanmar, Vietnam, Bangladesh and Venezuela, characterized by the production of tropical wines. It is important for the productive sector to comprehend the effects of grapevine interaction with the characteristics of each new region on wines composition. In this study, the composition of wines of Syrah from two regions with different altitudes in Northeast Brazil were analyzed by different methodologies to characterize chemical compounds as sugar, acids, minerals, phenolics (anthocyanins, fla-vonols, stilbenes and condensed tannins) and the sensory profile. The wines of the Bahia region (1100 m of altitude) obtained high concentrations for chemical parameters related to color, monomeric anthocyanins, stilbenes and monomelic and oligomeric tannins. Wines of the low altitude region, Pernambuco (350 m of altitude) were characterized by higher concentrations of flavonols (kaempferol, isorhamnetin, quercetin and rutin) and polymerized tannins. The chemical composition of wines from the two studied regions was influenced by altitude. A trend towards higher concentrations in most for phenolic compounds analyzed was observed in wines from the higher altitude region during the two years of study. Regarding the sensory profile, fruity, floral, herbaceous and empyreumatic attributes aromatic obtained highest scores in wines of the 350 m altitude region, the other attributes were dependent on the year of harvest.
       
  • Comparative Anatomy and Morphology of the Leaves of Grenache Noir and
           Syrah Grapevine Cultivars

    • Abstract: Grenache Noir and Syrah are two of the grapevine (Vitis vinifera L.) cultivars used to a great extent worldwide. They have very different leaf morphologies from an ampelographic (botanical) point of view. This might also be related to differences in the anatomy and micro-morphology of their leaves. The goal of the present work was to compare these cultivars' leaf anatomy and morphology. Adult leaves from both cultivars were characterised using a range of microscopy techniques. Grenache Noir had a significantly smaller leaf surface area, but a significantly thicker leaf blade, than Syrah. It also had significantly larger stomata and a larger stomatal index than Syrah. The distribution of mesophyll tissues was similar in both cultivars, but the upper epidermis was significantly thicker in Grenache Noir, and the palisade parenchyma cells were longer in Syrah. The mesophyll tissues of both cultivars contained abundant idioblasts carrying crystals of calcium oxalate and mucilage. This work reveals quantitative and qualitative differences in the anatomy and morphology of mature Grenache Noir and Syrah leaves. Further work is needed to determine how these anatomical and morphological differences may be connected with different responses at the functional level.
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 35.172.195.49
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-