Jagtap, B. R. and Acharya, S. and Patel, J. B.
(2012)
Character Association Analysis of Resistance to Helicoverpa Armigera in Pigeonpea [Cajanus Cajan (L.) Millsp.].
International Journal of Food, Agriculture and Veterinary Sciences, 2 (1).
pp. 92-100.
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Abstract
Character association analysis for per se resistance to Helicoverpa armigera in pigeonpea [Cajanus Cajan (L.) Millsp.]” was studied in sixty diverse single plant selections having differential combinations of flower colour, pod colour and leaf thickness selected from F6 generations of 10 x 10 Indo-African diallel crosses. These diverse lines were grown in two sets in randomized block design with two replications under identical conditions during kharif 2009-2010. The per se resistance to Helicoverpa was estimated as per cent reduction in yield in each genotype due to Helicoverpa feeding in net house as compared to yield under controlled condition. The per se resistance to Helicoverpa was substantiated by feeding the larvae on individual plant parts (pods, flower and buds) in laboratory and taking observations on gain in larval body weight. Data were recorded for five morphological and five biochemical attributes along with Helicoverpa resistance as measured through per cent loss in yield. The study indicated highly significant genotypic differences for per se resistance to Helicoverpa as also for other component characters. The estimates of the phenotypic (PCV) and genotypic coefficient of variation (GCV) were very close indicating lesser juxtaposition of variability by environmental. All the traits, except food protein content evinced higher estimates of heritability. The genetic advance per cent was also high for resistance to Helicoverpa and all other allied traits except, food protein content, leaf thickness, pod wall thickness and total sugar content. Resistance to Helicoverpa was positively and significantly correlated with gain in larval weight and total sugar contents and significantly negatively correlated with total tannin content and total phenol content. Gain in larval weight was negatively and significantly correlated with total tannin content, total sugar content, total phenol content and pod length.
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