Genetic Divergence in Recent Elite Strains of Soybean and Groundnut in India

U.H., Shwe and Murty , B.R. and Singh , H.B. and et al, . (1972) Genetic Divergence in Recent Elite Strains of Soybean and Groundnut in India. Indian Journal of Genetics and Plant Breeding , 32 (2). pp. 285-298.

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The present study was undertaken to find out the nature of diversity among some strains of soybean and groundnut with varying degrees of adaptation. Multivariate analysis of the nature of divergence among 16 varieties of soybean for 11 characters and 24 varieties of groundnut for 17 characters were carried out. The soybean varieties could be grouped into five clusters. One of the clusters (V) consisting of one variety, Rikku No. 21, diverged from the others. Based on the differences in the cluster means, characters such as number of nodes, number of pods per plant, plant height, habit, 100-seed weight and days to fifty per cent, flowering were found to be major factors of differentiation among these varieties. The 24 varieties of groundnut were grouped into three clusters with 7, 13 and 4 varieties, respectively. Based on the variation in the cluster means, the characters important for grouping were plant height, days to first ffowering, days to peak period of flowering, growth habit, leaf colour and resistance to Cercospora. In both soybean and groundnut it was found that the clustering pattern of the varieties did not follow their geographic origin. The groupings done by Mahalanobis’ D2 statistic in both the crops were confirmed by canonical analysis. Canonical analysis in soybean revealed that photosensitivity which determined total number of nodes was important in differentiation. In addition, root development and extent of nodulation are also important in this respect. In groundnut, it could be concluded that present classification of varieties based on growth habit alone was not proper as the coefficient for this character in the first vector is very low as compared to other characters like root development, leaf colour, nodulation and height. Root development was associated with plant height, synchrony of fruit formation and nodulation in soybean. Synchrony of fruit formation was positively associated with total number of main branches and negatively associated with plant height. In groundnut, root development was highly and positively associated with nodulation and association with other characters was not very high indicating that good root development could be combined with any other character. The results show that the diversity in both these crops was adequate for improvement by hybridization and selection for several favourable associations already present in the material.

Item Type: Article
Additional Information: SNNigam Collection
Uncontrolled Keywords: Genetic Divergence, Elite Strains, Soybean, Groundnut, India
Author Affiliation: Division of Genetics and Division of Plant Introduction, Indian Agricultural Research Institute, New Delhi
Subjects: Crop Improvement > Genetics/Genomics
Divisions: Groundnut
Depositing User: Mr Arbind Seth
Date Deposited: 14 May 2013 10:28
Last Modified: 14 May 2013 10:28

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