Abstract

The current investigation aims to develop the genetic capability of seed yield and oil content genotypes based on genetic analysis (heterosis) under water-deficient environments. In this manner, 6 mustard cultivars, which were highly water stress-tolerant, like (AARI-Canola, Khanpur Raya, Dhoom-1, Super Raya, Galaxy, and Coral-432) hybridized using a half diallel fashion 6 × 6 and produced 15 F₁ progeny for further genetic analysis. The research was conducted in randomized complete block design having three replications and two treatments, during 2019-20 at SAU, Tandojam. T₁ Well-watered at (stem growth, flowering, silique formation and maturity stages) and T₂ Water stressed at (stem growth and flowering stages), respectively. Total 8 traits were investigated (plant height, branches plant^-1, seed yield plant^-1, seed index, SPAD chlorophyll, relative water content, oil content and protein content). Mostly studied traits revealed significantly differed (p<0.05) for all variances like (mean squares) of genotypes, treatments and genotype×treatment interaction as well as for heterotic effects over better parents under both conditions. The hybrids AARI-Canola×Super Raya, AARI-Canola×Galaxy, AARI-Canola×Coral-432, Khanpur Raya×Coral-432 and Super Raya×Coral-432 demonstrated superior parent heterotic effects for seed yield and its related traits under water deficit. Therefore, these crossing materials are helpful for heterotic breeding on a genetic and water stress basis and could be used for the development of desired genotypes and crosses in future breeding as well.

 Keywords: Mustard, water deficit, heterosis, yield traits, oil traits