Genetic analysis of yard long bean (Vigna unguiculata subsp. sesquipedalis (L.) Verdcourt) for vegetative and yield characters

Merin Elza George, S. Sarada

Abstract


Gene action involved in the inheritance of vegetative and yield characters in yard long bean was estimated using generation mean analysis. Six basic generations, viz., P1, P2, F1, F2, BC1 and BC2 of the cross VS 50 (Kakkamoola Local) x VS 26 (Vellayani Jyothika) were used for the study. Significance of scaling test revealed the presence of epistasis for all the characters under investigation. Pod yield/ plant was highest for F1 (1116.83 g) and lowest for P2 (584.00 g) among the generations. The predominance of dominance x dominance gene action for the characters pod length, pod weight and yield/ plant indicated that the traits could be improved through hybridization followed by selection. Presence of dominance gene action for vine length at final harvest, days to first flowering, pods/ plant and days to harvest pointed out the suitability of resorting to heterosis breeding. Duplicate type of epistasis was observed for most of the traits studied. High heritability was observed for pod length and pods per plant. High degree of transgressive segregants was observed for pod length.


Keywords


Yard long bean, generation mean analysis, gene action, heterosis breeding

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A KAU publication [CODEN: JTAGEI; ISSN 0971-636X; eISSN 0973-5399]