PREDICTION AND VALIDATION OF THE FREQUENCY OF RECOMBINANT INBRED LINES SURPASSING PRE-DETERMINED STANDARDS FOR QUANTITATIVE TRAITS IN DOLICHOS BEAN(LABLAB PURPUREUS L. SWEET) VAR. LIGNOSUS
Journal Title: International Journal of Agriculture Sciences - Year 2016, Vol 8, Issue 18
Abstract
Development and use of an objective criterion for selecting a few potential crosses to maximize the frequency of superior pure-lines would help increase the pace and efficiency of any self-pollinating species with Dolichos bean being no exception to this. Probability of RILs that transgress the parental and/or any pre-determined rangecan be predicted based on additive [d], additive × additive epistatic gene effects [i] and additive genetic variance (σ2A) estimated in initial selfing and/or backcross generations derived from a cross. An investigation was conducted to predict and validate the frequency of F5 RILs derived from HA 10-8 × RIL 180 that surpass the limits of their parental phenotypes and of check variety, HA 4 for nine quantitative traits.A fairly good agreement was observed between observed and predicted frequency of RILs that transgressed higher scoring parent only for primary branches plant-1. On the other hand, good agreement was noticed between observed and predicted frequency of RILs that transgressed the lower scoring parent for dry pod yield plant-1 and 100-dry seed weight. The agreement between predicted and observed frequency of RILs that transgressed either of the parent was rather poor for plant height, primary branches plant-1, racemes plant-1, raceme length, dry pods plant-1 and dry seed plant-1. The poor agreement between predicted and observed frequency of RILs for these traits was attributed to linkage disequilibrium between the genes controlling these traits.
Authors and Affiliations
M. S. SHIVAKUMAR
Keywords
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