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FLOWERS’ SHEDDING UNDER HIGH TEMPERATURE IN MUNGBEAN (VIGNA RADIATA (L.) WILCZEK)

GUL SANAT SHAH KHATTAK^*, IQBAL SAEED AND TILLA MUHAMMAD

Abstract: Segregating populations were developed through induced mutations and hybridization using local and exotic mungbean genotypes to select mutants/recombinants tolerant to flowers shedding under high temperature. Entire segregating population showed flowers shedding under high temperature. But 242 recombinants/mutants were advanced to phenotypic uniformity following consecutive selection on the basis of new flowers production on the same raceme from where flowers were shed under high temperature. These recombinants/mutants were evaluated to rate the new flowers production on terminal raceme of the main stem at 90% pods maturity and to collect basic information about flowers shedding under high temperature. Out of 242 recombinants/mutants, 163 showed 10-20% (moderately tolerant) and 79 showed more than 40% (susceptible) flowers shedding from terminal raceme on the main stem recorded at 90% pods maturity. Only opened flowers shed under high temperature. Buds and pods at any stages did not shed due to high temperature. Humidity fluctuations had no effect on the flowers shedding in mungbean.

Nuclear Institute for Food and Agriculture (NIFA), P.O. Box 446, Tarnab, Peshawar, NWFP, Pakistan.