PJB-2019-327
GENETICS OF YIELD RELATED TRAITS AND STRIPE RUST RESISTANCE IN BREAD WHEAT (Triticum aestivum L.)
Mohsin Niaz
Abstract
The information regarding magnitude and type of gene action facilitates breeders to exclude undesirable genotypes from experiment and include only productive material to accomplish breeding objectives. A 4x4 complete diallel experiment was conducted involving wheat varieties viz., Punjab-85, Faislabad-85, Inqalab-91 and Bhawalpur-94 to evaluate genetic nature of various polygenic characters. Traits studied were flag leaf area, plant height, number of tillers plant-1, 1000 grain weight, harvest index, disease score and grain yield (Kgha-1). The analysis of variance showed highly significant differences among the genotypes for all the characters studied. The graphic representation of variance (Vr) and covariance (Wr) represented that all the traits studied were under the control of over-dominance type of gene action. Significant values of a and b items indicated the role of additive and dominance effects for all the traits studied. All traits except disease score showed positive and significant values of D, H1 and H2 indicating the presence of additive and dominance gene effects in governing these traits. Stripe rust was found under the control of non additive type of gene interaction and selection for this trait has to delay for later generations while other traits can be selected in earlier generations. Genotypes like Faisalabad-85 and Punjab-85 had maximum dominant genes for grain yield (Kgha-1) and stripe rust while Bahawalpur-94 and Inqalab-91 had maximum dominant genes for harvest index,1000-grain weight and number of tillers plant-1 .
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