1M. Prathinlekha, 1R. Eswaran, 2M. Raj kumar and 1*N. Senthil Kumar

1Department of Genetics and Plant Breeding, 2Department of Horticulture, Faculty of Agriculture, Annamalai University, Annamalai Nagar – 608 002 (India) E-Mail: amplprathin9610@gmail.com


The choice of plant breeding methodology for upgrading the yield potential largely depends on the availability of reliable information on the nature and magnitude of gene effects present in the population. The present study was undertaken during 2021-2022 with the objective to study the gene action of seed cotton yield and other important traits in cotton using the full diallel technique involving seven parents namely MCU 5, MCU 7, SVPR 2, SVPR 4, Swaraj, Surabhi and Kumbakonam local. Data from the F1 generation and parents were analyzed using Hayman4 method of diallel analysis. Additional statistics needed for the genetic interpretation indicated that all the traits were controlled by the both additive and non-additive genetic variance. Estimates of genetic component variance due to additive (D) were significant for traits days to 50% flowering, fiber length, seed index, ginning outturn and seed cotton yield per plant. Dominant components (H1 and H2) were also significant for all the traits studied. The positive F value and KD/KR (>1) indicated the distribution of more dominant alleles for most of the traits. The negative value of F and KD/KR (<1) indicated the distribution of more recessive alleles for the traits number of sympodial branches, boll weight and lint index. The potence ratio indicated the presence of over dominance in the inheritance of most of the traits. Narrow sense heritability indicated the importance of non-additive genetic variance in the inheritance of most of the traits.

Key words : Full diallel, genetic parameters, narrow sense heritability, cotton

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