BREEDING POTENTIAL OF SELECTED CROSSES IN DOLICHOS BEAN (Lablab purpureus L. Sweet)
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Date
2016-08-12
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Early elimination of un-productive crosses and handling of
reasonably a large segregating populations derived from a few promising
crosses will help enhance efficiency of crop breeding. Further, direct
selection for economically important traits such as pod yield and its
component traits has been less effective. The indirect selection for such
difficult–to-breed traits based on easily observable/assayable/scorable
traits is likely to be more effective. However, such a strategy requires a
priori identification of traits strongly associated with difficult-to-breed
traits. The combination of high quantitative traits means, absolute and
standardized range, variances and frequency of transgressive segregants
estimated in F2 and F3 generations was used as the criterion to assess
and identify crosses with high breeding potential in terms of recovery of
high frequency of pure-lines with desirable combinations of target traits
in dolichos bean. The correlation coefficients of easily observable traits
such as plant height, primary branches plant-1, racemes plant-1 and
raceme length with dry pod and dry seed yield plant-1 were estimated to
identify the traits which were significantly associated with later traits.
Based on these criteria, the crosses, HA 10-8 × RIL 3-180 and FPB 21 ×
RIL 3-180 were predicted to have better breeding potential. The traits
such as plant height, racemes plant-1 and raceme length were suggested
for use as surrogates of dry pod and dry seed yield plant-1 for developing
improved pure-line varieties of dolichos bean.
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