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Jagtiāl, India

Genetic variability parameters were estimated in F 2 and F 3 populations of two crosses viz., Dapoli Safed x GC 10 and Manjarkheda local x G 1 of cowpea. In both the crosses magnitude of PCV, GCV, heritability and genetic advance values higher in F 3 as compared to F 2 population. Number of pods per plant, biomass at harvest, days to maturity, number of seeds per pod, pod length, 100-seed weight and seed yield per plant recorded higher GCV, PCV, heritability and genetic advances, indicating the prevalence of additive gene action in the control of these characters and simple selection helps in development of high yielding cowpea genotypes.

Bhadru D.,Rice Research scheme | Bhadru D.,Agricultural Research Station | Tirumala Rao V.,Rice Research scheme | Chandra Mohan Y.,Rice Research scheme | Bharathi D.,Rice Research scheme
Sabrao Journal of Breeding and Genetics | Year: 2012

A total of 21 rice genotypes (resistant to gall midge biotype 3 and BPH were evaluated for their variability and genetic divergence. The highest genotypic and phenotypic coefficient of variation, heritability and genetic advance % of mean corresponded to grains per panicle, seed yield, 1000 grain weight and plant height and direct selection for these traits would be useful for yield improvement in rice. The D2 values were significant among the 21 genotypes, which were grouped into 6 clusters. Most of the genotypes with same pedigree either male or female parent involved cross combination came under the same cluster and few genotypes in different cluster and genotypes of quite different pedigree may all into the same cluster. For getting desirable transgressive segregants for the development of early duration (Genotypes from the clusters II and Cluster VI) and medium duration (from the clusters I and IV), coarse and medium slender high yielding gall midge and BPH resistant varieties genotypes could be utilized in the hybridization programme.

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