OAR@ICRISATComponents of genetic variation in short-duration pigeonpea crosses under waterlogged conditionsA MPereraauthorH SPooniauthorK BSaxenaauthorWaterlogging inflicts considerable stress and yield-loss on short-duration pigeonpea and the present study investigates the genetical control of phenotypic variation expressed in the basic generations of some elite crosses under waterlogged conditions. Comparisons of the parental and Fl families for the 22 traits representing various facets of morphological variability revealed that the additive and dominance effects were present for a large number of these traits. Better parent heterosis was present in one or more crosses for all except two traits (ILN40 and NTR40) and a maximum of five (out of six) crosses showed heterosis for plant height (PH40) and days to lenticel formation (DYL). Analyses of the PI( P2, nents of genetic variation in short-duration pigeonpea crosses under waterlogged conditionsF1( F2, F3> Bcu and Bct^ generations further indicated that the genetical control of various traits was rather complex. Epistasis was detected for S6 (out of 126) cross/trajt combinations and there was no trait for which epistasis was non-significant in all the crosses. Presence of predominantly duplicate epistasis also pointed to a transient advantage for the hybrid varieties and better prospects of extracting superior recombinant inbred lines. In general, crosses between the tolerant and susceptible lines showed more variation compared to those involving only the tolerant lines and therefore possessed better potential for further breeding. Lack of apparent association between plant vigour and tolerance to waterlogging also indicated that plant vigour does not play a direct role in determining the tolerance to waterlogging in short-duration pigeonpea.Pigeonpea2001Istituto sperimentale per la cerealicoltura.Article

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