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Designate the gene dose for yield related indices in spring wheat

Hafiz Ghulam Muhu-Din Ahmed, Abdus Salam Khan, Muhammad Shahid Sadam, Muhamma Hammad Yasir, Siddra Zahid, Mubra Benish, Adeel Khan

Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad, Pakistan

Key words: Additive, Indices, Regression, Segregation, Population.


WheatnhYield is economically most important and most complex polygenic trait. To meet the today’s challenges new genotypes of wheat are being evaluated by continued genetic recombination. Present study was carried out using 5 × 5 full diallel to designate the gene action responded to yield related indices like plant height, tillers per plant, spikelets per spike, grains per spike, 1000-grain weight, and grain weight per spike. Significant genotypic differences were observed for all the observed traits. Regression line indicate that , Punjab-11 has maximum dominant genes for plant height, and grain weight per spike while Millat-11 has maximum dominant genes only for number of tillers per plant and maximum recessive genes for grains per spike and grain weight per spike. 9466 has maximum number of dominant genes for spikelets per spike, grains per spike and 1000-grain weight. Higher number of recessive genes for plant height, spikelets per spike, spike length and 1000-grain weight was the characteristics of parent 9469. While 9459-1 got maximum dominant genes only for 1000-grain weight. The Wr/Vr graphical analysis indicated that the partial dominance along with additive genetic effects was observed for all studied traits except spikelets per spike, so for desirable improvement and selection in early segregating generations may be fruitful. While existence of over dominance for spikelets per spike make difficulties for selection. Non-allelic interactions were absent for all the traits under study.

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