Abstract
Efforts to improve wheat plant have been made at various plant characters. Yield component breeding and modification of the plant architecture offer possibilities to develop more efficient breeding systems for increased grain yield. A 6 × 6 diallel experiment was conducted to determine the genetic mechanism of stomatal traits influencing grain yield in hexaploid wheat. Graphical representation indicated the over-dominant type of gene action for 1000-seed weight, seed yield per plant, leaf venation, stomatal size, epidermal cell size and stomatal frequency suggesting that selection would be difficult in early segregating generation. Hence heterosis breeding may useful for genetic improvement for these traits. Non allelic interactions were found to be absent for all traits. The genotype Aas-11 contained maximum dominant genes for epidermal cell size while genotype 9515 for 1000grain weight and seed yield per plant. The genotype 9516 possessed maximum dominant genes for leaf venation. Whereas, genotype Iqbal-2000 carried maximum dominant genes for stomata size.
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