Browsing by Author "Ramakrishnan, M"
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ThesisItem Open Access Genetic analysis of productivity in relation to maturity in bunch groundnut(Department of Plant Breeding, College of Agriculture, Vellayani, 1991) Ramakrishnan, M; KAU; Gopinathan Nair, VA preliminary evaluation of 63 bunch type of groundnut revealed that the genotypic coefficient of variation was highest for number of immature pods per plant which indicated the maximum genetic variability for the trait and lowest for oil content which indicated low variability for the trait. High heritability along with moderate genetic advance was obtained for shelling percentage and 100 kernel weight which showed the importance of additive genes in their control. A maturity index was formulated and on its basis the 63 types were classified in to three groups namely, extra early, early and medium. In the extra early group, 100 pod weight and 100 kernel weight were important components for pod yield. In the early group. Number of mature pods per plant, shelling percentage and 100 kernel weight were important components for pod yield. In the medium group, number of mature pods per plant, shelling percentage and 100 kernel weight were important components for pod yield. For oil yield in all the three groups, pod yield and shelling percentage were the important components. Line x Tester analysis with six extra early types as lines and three high productive types as testers indicated predominance of sca variance over gca variance indicating pre ponderance of non – additive gene action over additive for the traits studied. Chico was the best general combiner for earliness and TMV 2 was the best general combiner for pod yield. High yielding extra early recombinants were selected at 80 days after sowing from the 18 Fz populations for further testing and selection.ArticleItem Open Access Summer groundnut as a component of rice based cropping system(Kerala Agricultural University, 1994) Ramakrishnan, M; Gopinathan Nair, V; KAUReali/ing the difficulty in determining the time of optimum maturity in groundnut, a maturity index was formulated. Recombination breeding with high productive and extra early types was undertaken. Combining ability was estimated by the line \ tester method. Among lines, Chico was the best combiner for earliness. Among testers, TMV 2 was the best for productivity. High yielding extra early recombinants were selected from the ?2 populations for further testing and selection.