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Although an average plant height is more preferable in most of agronomic  crops, less reduction of this trait in stress condition makes yield  components and seed yield sustainable in rapeseed varieties. Combining  ability, heterosis and heritability of plant height at application and  non-application of nitrogen environments (Hp and Hs, respectively) and its  related stress tolerance indices were detected in half F2 diallel crosses of  six spring rapeseed varieties. Significant mean squares of general and  specific combining abilities (GCA and SCA) were detected for Hp, Hs, mean  productivity (MP), geometric mean productivity (GMP) and stress tolerance  index (STI), indicating the importance of additive and non-additive genetic  effects for them. A high narrow-sense heritability estimate was exhibited for  STI, emphasizing the prime importance of additive genetic effects for this  stress tolerance index. A significant correlation among Hp, Hs, MP, GMP and  STI showed the efficiency of these stress indices for improving plant height  in plant breeding programme. In comparison to SCA effects, most of the  crosses had significant high parent heterosis for Hp, Hs and all the stress  indices. RGS003 with a significant positive GCA effect of Hs was considered  as a suitable parent for improving this trait and most of the combinations of  this genotype had significant negative SCA effects

Combining ability of nitrogen deficiency stress indices for plant height in rapeseed varieties