Genetic divergence studies in oat germplasms (Avena sativa L.)
Loading...
Date
2020-12
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Sher-e-Kashmir University of Agricultural Sciences and Technology Jammu, J&K
Abstract
The present study was undertaken to assess the genetic diversity present in the twenty-eight oat (Avena sativa L.) germplasms collected from different centres of the country. The experiment was conducted at Research Farm of Division of Plant Breeding and Genetics, Chatha during Rabi 2018-19 in RCBD with three replications and data on different morpho-physiological, yield and quality traits recorded. The statistical analysis revealed that the genotypes differed significantly for all the traits under study indicating sufficient amount of variability present in the genotypes. Selection of superior oat genotypes based on their performance for crude protein, leaf stem ratio, green fodder yield and dry matter yield will be effective as these traits showed high heritability as well as high genetic advance. Trait association analysis suggested that leaf area index, plant height, days to maturity, number of tillers per plant and stem girth had high significant positive and direct association with green fodder yield. Hence, selection based on such component traits may increase the green fodder yield in oat genotypes. The phenotypic variance of all the traits under study was found to be higher than genotypic variance confirming that environment play an important role on performance of oat genotypes. D2 analysis (Tocher’s method) grouped all 28 genotypes into six clusters. Cluster I (19 genotypes) and Cluster II and IV (1 genotypes) were the largest and the smallest clusters respectively. The mean for green fodder yield (7.08 kg/plot), dry matter yield (1.41 kg/plot) and number of leaves per plant (83.17) was highest in cluster number II, cluster I had highest mean for leaf length (40.66 cm) and cluster V had the highest mean for days to 50 per cent flowering (105.33). The inter-cluster distance was highest between VI and III cluster pair suggesting significant high genetic diversity among genotypes of these clusters. On the basis of mean performance and genetic distance of different traits, genotypes OS 346 and JHO 88-2 were selected for plant height, OS 403 and Local 1 for leaf length, OS 346 and JHO 88-2 for leaf width, JHO 88-2 – OS 6 for green fodder yield and OS 403 – OS 346 for dry matter yield were found to be diverse. Crude protein, leaf stem ratio and days to maturity contributed maximum towards variability which served as source traits for genetic divergence study in the present set of oat genotypes. The molecular diversity analysis using ten SSR markers clustered all the 28 genotypes into five clusters and significant level of dissimilarity was depicted among them. PIC values ranged from as low as 0.19 to as high as 0.59 with highest PIC value was observed in AM 04 (0.59). Genetic divergence revealed JHO 88-2, SKO 90 and SKO 98 to be most diverse at both morphological as well as molecular level. These genotypes can further be utilized for hybridization programme to achieve high yielding fodder oat segregants.
Description
Keywords
Citation
Preferred for your work. Mahrukh. 2020. Genetic Divergence Studies in Oat Germplasms (AvenaSativaL.). M.Sc. thesis, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, India.