VARIATION IN DEVELOPMENTAL AND MORPHOPHYSIOLOGICAL TRAITS UNDER DIFFERENT ENVIRONMENTS AND THEIR RELATION TO GRAIN-YIELD OF GREENGRAM (PHASEOLUS-RADIATUS)

The influence of growing environments on developmental and morpho-phys iological characters in 20 genotypes of greengram [Phaseolus radiatus L. syn Vigna radiata (L.) Wilczek] was studied during 1987-89. The dif ferences among the genotypes were significant for all the characters s tudied in all 6 environments, indicating the presence of sufficient ge netic variability in the material. The performance of genotypes varied in different environments, indicating the existence of strong genotyp e X environment interactions. Rainy season and winter uplands were fou nd the most favourable environments for dry matter of shoot and grain yield, whereas winter uplands for nitrogen in the shoot and seed prote in. Positive and significant associations of grain yield with dry matt er of shoot and nitrogen content in shoot were recorded in all the 6 e nvironments. Four genotypes, viz 'LGG 407', 'LGG 410', 'LGG 450' and ' Pusa 105', with higher dry matter of shoot and shoot nitrogen at peak flowering recorded higher grain yield in different environments, compa red with other genotypes. Higher dry matter of shoot at harvest and hi gher mean values for primary yield components were found important for selecting genotypes for higher yield in greengram.