Wide hybridisation and introgression of anthracnose resistance in thebackground of local landraces of rajmash (Phaseolus vulgaris)
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Keywords:
Common bean, Phaseolus vulgaris, Phaseolus coccineus, Phaseolus acutifolius, Inter-specific hybridisationAbstract
The present study was aimed to broaden the genetic base of rajmash (Phaseolus vulgaris L.) by conducting a wide hybridisation programme under controlled conditions. The study involved crosses between cultivated and wild Phaseolus vulgaris and inter-specific crosses of P. vulgaris with P. coccineus, P. acutifolius and P. lunatus. The success of hybrid establishment and their comprehensive development was up to 18.28% in intra-specific hybrids, with accessions of secondary gene pool 3.94–9.04%, with tertiary gene pool and with quarterly gene pool only 0.5%. However with mentor pollinated, the achievement rate of intra-specific hybrids was 16.84%. On the basis of pooled mean performance, RIL (Recombinant inbred line) 14 of Bhaderwah Local (BL) × Poonch Local (PL) in F4 and
F5 generations showed maximum seed yield (15.56 g/plant) along with moderately resistance against anthracnose. Similarly, RIL11of mentor pollinated inter-specific hybrid in F4 and F5 generations showed higher seed yield (29.79 g/plant) along with resistance against anthracnose. The application of wild species of rajmash i.e. P. coccineus, P. acutifolius and P. lunatus for the improvement of rajmash was just initiated and success rate is very less in India and remains limited. Promising RILs of both intra and inter-specific hybrids may be further evaluated for stability in performance for varietal development programme in the background of local land races of rajmash of Union Territory of Jammu and Kashmir.
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