Present experiment was conducted to study the variability in F2 population of JL 24 X ICG 11337 and JL 24 X ICG 13919 groundnut. Among these F2 populations both the crosses showed high variability in the form of PCV, GCV heritability and GAM for mature pods per plant, total pods per plant, mature seeds per plant, haulm weight per plant, LLS disease score at 75 DAS and pod yield per plant. It was observed that selection for these traits would be useful in the genetic improvement of these traits. High heritability coupled with moderate GAM for DS-90 in both the crosses. The cross JL 24 X ICG 11337 recorded high heritability and genetic advance as per cent of mean for DS-102. The result indicates that gains through selection is possible in this cross this may be due to the resistant parent, ICG 11337 may contribute gains through selection for LLS disease score at 102 DAS
Groundnut (Arachis hypogaea L.) is an important annual oilseed legume crop, valued as a rich source of protein, minerals and vitamins. is the major oilseed crop in India and in Andhra Pradesh. India ranks second in groundnut production after China with an area of 4.93 million hectares and a production of 5.64 million tons during 2010 (FAOSTAT, 2012). But the average groundnut yield in the country is low (1.14t/ha) compared to world average and that of China. The productivity is considered to be low because of number of constraints like abiotic (frequent droughts) and biotic stresses (attacks by pests and diseases). The low productivity of the crop is ascribed mainly due to two major foliar diseases namely late leaf spot (causal organism: Phaeoisariopsis personata [(Berk. and Curt.) Deighton]) and rust (causal organism: Puccinia arachidicola Speg.). These two diseases often occur together and causes up to 50-70% of yield losses in the crop (Subrahmanyam et al., 1985). Development of cultivars resistant/tolerant to late leaf spot could be effective in decreasing the production costs, improving production quality and reducing the detrimental effects of chemicals on our ecosystem. Genetic variability is the basic requirement for crop improvement as this provides wider scope for selection. Thus, effectiveness of selection is dependent upon the nature, extent and magnitude of genetic variability present in material and the extent to which it is heritable. In the present study, variability and other genetic parameters were studied.
The high genetic variability in the form of phenotypic coefficient of variation (PCV) and genotypic
coefficient of variation (GCV) was observed for number of mature pods per plant, total pods per plant, immature pods per plant, immature seeds per plant, mature seeds per plants, haulm weight per plant and LLS disease score at 75 DAS and pod yield per plant
of all F2 Populations. High heritability of these traits indicates that whatever variation occurred is mainly genetic and less influenced by the environment
(Rudra Naik et al. 2009). Therefore, priority should be given for these traits during selection.
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