Muhammad Irfaq Khan, Gul Sanat Shah Khattak, Abdul Jabbar Khan and Shah Jahan Khan

pp. 397 - 406

Abstract

Genetic effects on grain yield (GY) were determined in four wheat crosses using mixed inheritance model. GY in cross
1 was controlled by Model E while it was under control of Model E-1 in other crosses. Additive effects of two major genes
were observed in cross 1 while additive effects due to several polygene and negative additive effects related to the major
genes were observed in controlling GY in the rest of the crosses. Transgressive segregates in the segregating populations
of all the crosses indicated the presence of favorable and adverse genes in the parents for GY. Major genes heritability was
higher than that of the polygene in the segregating populations of all the crosses with highest environmental influence.
Additively controlled nature of the trait predicts that selection of desirable recombinants for higher GY may be delayed up to
advance generations until favorable genes are accumulated in homozygous condition.

Keywords

• Major genes + minor genes interaction
• grain yield
• Triticum aestivum L.