Author(s):

Suresh S Handi, Ramesh M and IS Katageri

Abstract: A total of 320 cotton germplasm collections developed in various breeding schemes, commercially released vrieties, exotic and indigenous germplasm collections were utalied to study the genetic variations by evaluated with five checks viz., Sahana, Surbi, MCU-5, DS-28 and ARBH-813. The germplasm lines recorded high genetic and phenotypic coefficient of variation across five environments. Correlation among the yield component traits indicates their dependence on each other. Present study also estimated genetic divergence based on D2 values, 320 germplasm lines includind five checks were grouped into eighteen clusters based on morphological and yield contributing tratis indicating high amount of divergenve. Among the eighteen clusters, cluster XVI was the largest with 37 germplasm lines followed by cluster II with 31 germplasm lines and cluster XII is the smallest with 7 germplasm lines. Number of monopodia contributed 30.58 per cent to the total divergence followed by seed index (13.36%), plant height (13.16%), ginning outturn (13.09%) and it was observed that genotypes grouped under cluster III, II and VI ranked first by having four characters at desirable direction and selection of genotypes under these cluster would be useful to generate desirable genetic resource on inter crosses.

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