Vol. 10, Issue 12 (2021)

Author(s):
Narendra Padra and GM Lal

Abstract:
Indian mustard to have greater tolerance to heat and water stress than the canola quality Indian mustard. But high temperature prevailing at the time of sowing reduces seed germination and causes seedling mortality, resulting in poor crop stand and reduced seed yield. To estimated genetic variability, heritability in broad sense and genetic advance of Indian mustard genotypes, eighteen genotypes including one check, were sown in the field under heat stress conditions in CRBD (Complete Randomize Block Design) with three replications at ICAR-Directorate of Rapeseed–Mustard Research, Sewar, Bharatpur, (Rajasthan) during rabi 2020-2021. It is situated at 77^o 30’ E of longitude, 27^o 15’ N latitude and at altitude of 178.37 m above mean sea level. Mean performance of days to 50% flowering earliest for DRMRHT-18-134 (33.5 days), genotype DRMRHT-18-142 (30.00gm) recorded maximum seed yield per plant, the maximum membrane stability index was found in DRMRHT -17-21 (36.58%) and the maximum relative water content was recorded in genotype DRMRHT-17-50. The phenotypic coefficient of variation (PCV) highest for membrane stability index (44.42%) and the Genotypic coefficient of variation (GCV) also highest for membrane stability index (44.25%). The estimates of heritability in broad sense were high for membrane stability index (99.48%). High estimates of heritability coupled with high genetic advance were observed for membrane stability index (%), secondary branches per plant, seed yield per plant (g). High heritability coupled with medium genetic advance for days to 50% flowering, chlorophyll b (mg/g FW). Low heritability with medium genetic advance for chlorophyll a (mg/g FW).