Vol. 11, Issue 6 (2022)

Author(s):
SK Rai and Akriti Sharma

Abstract:
The present investigation was undertaken to study the genetic divergence of different Brassica genotypes for white rust resistance in a group of 37 varieties/genotypes of Brassica juncea, Brassica napus, Brassica rapa (Toria) with respect to 11 different characters. The heritability value ranged from 99.3% for days to maturity to 23.2% for oil content under irrigated condition, whereas under rainfed condition it ranged from 99.3% for days to maturity to 32.6% for number of primary branches/plant. The maximum positive direct effect (genotypic level) on seed yield per plant(g) was exhibited by days to maturity and days to 50% flowering while as maximum negative indirect effect was exhibited by siliqua length (cm) under irrigated condition. Under rainfed condition maximum positive direct effect (genotypic level) on seed yield per plant (g) was exhibited by days to maturity and maximum negative indirect effect exhibited by days to 50% flowering. The genotypes NRCDR-2, Kranti, RSPR-01 and PT-2012-5, KBS-3, RMT-10-9 are more diverse genotypes under irrigated condition and from rainfed condition NRCHB-101, SKJM-5 and RSPT-6, RSPT-2 are more diverse genotypes. The cluster I and cluster VII from both environmental conditions contain maximum inter and intra cluster distances because of wide genetic diversity among its genotypes. Therefore it is possible to utilize that genetic variation in hybridization programme to develop new or productive varieties of Brassica species.This study further can be useful for selection of desirable genotypes of Brassica species to fulfil the various breeding objectives.