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BREEDING FOR HEAT TOLERANCE IN MUNGBEAN (VIGNA RADIATA (L.) WILCZEK)

GUL SANAT SHAH KHATTAK, IQBAL SAEED AND TILA MUHAMMAD

Abstract: 14 commercial mungbean varieties and 24 advanced genotypes developed through hybridization were evaluated for maximum flowers’ retention capability under high temperature (above 40°C) and agronomic traits at NIFA, Peshawar during summer (15^th March - June) 2005. Similarly 77 mutants derived from NM 92 and 51 recombinants selected from three crosses i.e. VC1560D x NM92, VC1482C x NM92 and NM98 x VC3902A were evaluated for maximum flowers’ retention capability under high temperature and agronomic traits at NIFA, Peshawar during summer 2006.  Almost all of the commercial varieties and advanced genotypes showed moderate tolerance to flowers’ shedding under high temperature except NM 92 which showed susceptibility to flowers’ shedding under high temperature. The mutants derived from NM92 and recombinants selected from the three crosses showed moderate tolerance to flowers’ shedding under high temperature. The commercial varieties and advanced genotypes differed significantly for days to50% flowering, days to 90% pods maturity, plant height, 1000 seed weight and seed yield/plant. NFM-6-5 and NFM-12-14 showed significantly high seed yield as compared to NM 92. No genotype among the evaluated material showed absolute tolerance to flowers’ shedding while NM 92 showed susceptibility to the same trait under high temperature (above 40°C).

Nuclear Institute for Food and Agriculture (NIFA), Peshawar, NWFP, P. O. Box 446, Pakistan
Corresponding A uthor: Gul Sanat Shah Khattak; gssktt@yahoo.com