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Journal of Plant Breeding and Genetics
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  This is an Open Access Journal Open Access journal
     ISSN (Print) 2308-121X - ISSN (Online) 2305-297X
     Published by eSci Journals Publishing Homepage  [6 journals]
  • BREEDING FOR IMPROVING THE SEED YIELD AND YIELD CONTRIBUTING TRAITS IN
           BRASSICA NAPUS L. BY USING LINE × TESTER ANALYSIS

    • Authors: Shehzad A. Kang, Frasat Saeed, Muhammad Riaz
      First page: 111
      Abstract: The study was conducted to estimate genetic variation, GCA and SCA in Brassica napus genotypes {Star, Golarchi, Hybripol, UAF 2, BA 0714 (lines) and Range, DGL, Ayub2000 (testers)} for seed yield and yield components. These genotypes were crossed in 5×3 line×tester crossing fashon (2010-2011).  Data of F1 and their parents were recorded (2011-2012) for days taken to maturity, plant height, secondary branches/plant, number of siliqua/plant, number of seeds/siliqua, 1000-seed weight, seed yield/plant, protein and oil content. The results of analysis of variance showed significant differences in different parents for all the traits. Analysis of variance for combining ability for different traits showed that mean sum of squares due to lines were significant for all the traits except 1000-seed weight and protein content whereas for testers, the mean sum of squares were non-significant for seed yield/plant. Highly significant results were found in line×tester interaction for all above mentioned traits. The estimates of SCA variance was noticed higher than GCA variance in all traits. The contributions of lines as compared to testers were greater for all traits except 1000-seed weight and protein content.
      PubDate: 2013-12-30
      Issue No: Vol. 1, No. 3 (2013)
       
  • MATING DESIGNS: HELPFUL TOOL FOR QUANTITATIVE PLANT BREEDING ANALYSIS

    • Authors: Athanase Nduwumuremyi, Pangirayi Tongoona, Slyvestre Habimana
      First page: 117
      Abstract: Selection of parental materials and good mating designs in conventional plant breeding are the keys to the successful plant breeding programme. However, there are several factors affecting the choices of mating designs. Mating design refers to the procedure of producing the progenies, in plant breeding, plant breeders and geneticists, theoretically and practically, they use different form of mating designs and arrangements for targeted purpose. The choice of a mating design for estimating genetic variances should be dictated by the objectives of the study, time, space, cost and other biological limitations. In all mating designs, the individuals are taken randomly and crossed to produce progenies which are related to each other as half-sibs or full-sibs. A form of multivariate analysis or the analysis of variance can be adopted to estimate the components of variances. Therefore, this review aimed at highlighting the most used mating design in plant breeding and genetics studies. It provides easy and quick insight of the different form of mating designs and some statistical components for successful plant breeding.
      PubDate: 2013-12-30
      Issue No: Vol. 1, No. 3 (2013)
       
  • DESCRIPTIVE AND DISCRIMINATORY SIGNIFICANCE OF POD PHENOTYPIC TRAITS FOR
           DIVERSITY ANALYSIS OF COCOA GENOTYPES

    • Authors: Daniel B. Adewale, Oluwayemisi O. Adeigbem, Omotayo O. Adenuga, Abigael F. Adepoju, Anna A. Muyiwa, Peter O. Aikpokpodion
      First page: 131
      Abstract: Intra-specific genetic diversity analysis precedes crop breeding proposal for species improvement. Sixteen and twenty-four parental and hybrid cocoa genotypes were respectively laid out in a randomized complete block design of six replications at Ibadan, Nigeria. A sampling unit of fifteen uniformly ripe pods was collected for assessment from each plot. Six quantitative data from the pods were subjected to statistical analysis. Highly significant (P < 0.0001) variability existed among the 40 genotypes. Range of performance of the genotypes were: pod weight (0.43 – 0.86kg), pod length (15.9 – 27.96cm), pod girth (21.51 – 34.07cm), pod thickness (1.26 – 5.71cm), number of beans per pod (20 - 51) and bean weight per pod (0.017 - 0.41kg). Positive and significant (P < 0.001) correlation existed between pod weight and length, pod girth and bean number/pod. The mean Gower genetic distance among the 40 genotypes was 0.228; the least (0.023) existed between G25 and G30 while the highest (0.529) was between G17 and G35. The first three principal component axes explained 73% of the total variation. Three distinct groups emerged from the Ward clustering technique. Significant (P<0.05) intra and inter cluster variability existed in the study. High genetic diversity lies within the studied population. Pod traits were important descriptors for cocoa genotypes classification.
      PubDate: 2013-12-30
      Issue No: Vol. 1, No. 3 (2013)
       
  • COMPARATIVE STUDY OF COWPEA GERMPLASMS DIVERSITY FROM GHANA AND MALI USING
           MORPHOLOGICAL CHARACTERISTICS

    • Authors: Ibrahima Z. Doumbia, Richard Akromah, James Y. Asibuo
      First page: 139
      Abstract: Cowpea improvement can be enhanced by knowledge of genetic diversity available between and within local and regional gene banks. This variability is the foundation of all cowpea improvement programs. A total of 94 accessions (47 from Ghana and 47 from Mali) was used for this study. Twelve qualitative and twenty quantitative traits such as flower color, growth habit, raceme position, seed shape, day 50% flowering, day 50% maturity, plant height, seed length and seed weight were used to assess collections. Data collected from different morphological traits were analyzed using XLSTAT 2013. Principal component analysis, scatter plot matrix and clustering separated the accessions according to some qualitative and quantitative traits. Accessions were classified based on their morphological relationships using un-weighted pair-group average Cluster Analysis. Results showed a relatively low level of genetic diversity between and within both germplasm; levels of similarity ranged between 0.95 to 0.069 for combined qualitative and quantitative data. However, some morphological traits discriminated more efficiently between the accessions than others. Few groups of the accessions were different from other accessions for some important traits. Implications of the variability in cowpea improvement are discussed.
      PubDate: 2013-12-30
      Issue No: Vol. 1, No. 3 (2013)
       
  • EVALUATION OF GENETIC DIVERSITY AMONG EDIBLE BANANA VARIETIES FOUND IN
           MIZORAM, INDIA USING RANDOMLY AMPLIFIED POLYMORPHIC DNA

    • Authors: Thangjam Premabati, Lalremsiami Hrahsel, Pachuau Lalrinfela, Robert Thangjam
      First page: 149
      Abstract: Genetic variations in the edible non-seeded banana cultivars found in Mizoram, India was studied using RAPD markers. A total of seven edible cultivars belonging to different genome groups were analyzed using six standardized UBC-primers. Out of six primers used, two primers namely UBC 416 and 450 generates 100% polymorphism. The average polymorphism per primer was 92.7%. The polymorphism information content (PIC) of the primers in used ranged from 0.58 to 0.89. The resolving power of primer, UBC-418 was the highest (9.4) while that of primer UBC-419 was the lowest (3.7). The dendrogram analysis revealed the grouping of the cultivars into two major groups. The first group was constituted by all the six hybrid cultivars of A and B genomes while the second group was represented by the lone triploid AAA genome sample. The result of the principal co-ordinate analysis also supported the dendrogram grouping of the samples studied. Thus, the use of RAPD technique for the study of genetic variations in the banana cultivars was demonstrated. It was also shown that significant amount of genetic diversity existed in the samples studied, thereby providing clear genetic information for future breeding and conservation strategies.
      PubDate: 2013-12-30
      Issue No: Vol. 1, No. 3 (2013)
       
  • IMPROVING SUBMERGENCE TOLERANCE OF VIETNAMESE RICE CULTIVAR BY MOLECULAR
           BREEDING

    • Authors: Ta-Hong Linh, Le-Hung Linh, Dong-Thi K. Cuc, Le-Huy Ham, Tran-Dang Khanh
      First page: 157
      Abstract: Submergence stress has caused by climate change is the major hindrance to enhancing rice production of Vietnam. In this study, we have evaluated the levels of submergence tolerance ability of the imported rice cultivars under the 4 different field trials. Among these, IR64-Sub1 exhibits the highest submergence tolerance with stable and high yield, and was used as a donor plant, while Bacthom 7, an elite Vietnamese rice cultivar was used as the recipient plant. In molecular markers study, we have used closely linkage markers with Sub1, flanking markers Sub1, and unlinked marker to Sub1 for the foreground, recombinant and background selections in the backcrossing generations between the donor and the recipient plants. In BC3F1 generation, the individual plant number 116 has carried QTL/Sub1 and retained the highest genetic background of the recipient parent up to 98.6%. The newly improved rice line may be useful for growing in the flooding areas of Vietnam to cope with the climate change.
      PubDate: 2013-12-30
      Issue No: Vol. 1, No. 3 (2013)
       
  • GENETIC DIVERGENCE IN F4:6WHEAT LINES FOR YIELD AND ITS CONTRIBUTING
           TRAITS

    • Authors: Malak A.U. Khan, Fida Mohammad, Taimur Malik, Abid Khan, Sayed J. Abbas
      First page: 169
      Abstract: Studying genetic divergence of quantitative traits and their contribution towards yield is essential for developing high yielding varieties. To study genetic divergence of F4:6 wheat lines for yield contributing traits, an experiment was conducted comprising 48 advance wheat lines and a check cultivar Janbaz at the University of Agricultural Peshawar, Pakistan during 2010-11. The research was laid out in alpha lattice design with 2 replications. Analysis of variance revealed highly significant differences among wheat lines for yield and related traits. Moderate to high magnitude of heritability estimates (0.53-0.93) were observed for days to heading, flag leaf area, plant height (cm), spikes plot-1, grain weight spike-1, grain yield and harvest index, while low to moderate heritability estimates (0.23-0.48) for spike length, grains spike-1, 1000-grain weight and biological yield. The selection response were 6.40 days for heading, 9.57 cm2 for flag leaf area, 11.74 cm for plant height, 0.83 cm for spike length, 185.11 spikes for spikes plot-1, 7.49 for grains spike-1, 0.67 g for grain weight spike-1, 5.07 g for 1000 grain weight, 628.50 kg ha-1 for biological yield, 855.92 kg ha-1 for grain yield and 5.56 % for harvest index, respectively. Selection differentials were 208.4 spikes for spikes plot-1, 1.9 cm for spike length, 13.4 for grains spike-1, 0.7 g for grain weight spike-1, 8.1 g for 1000 grain weight and 795.4 kg ha-1 for grain yield, respectively. Spikes plot-1, grains spike-1, grain weight spike-1, 1000-grain weight and harvest index had high correlations with grain yield. The crossings of Tatara, Ghaznavi-98 and Wafaq performed better than the check cultivar for most of the yield based desirable traits.
      PubDate: 2013-12-30
      Issue No: Vol. 1, No. 3 (2013)
       
 
 
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