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GrainGenes Reference Report: CRI-30-189

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Reference	CRI-30-189
Title	Gene action for grain yield and its components under heat stress in bread wheat (Triticum aestivum L.)
Journal	Crop Improvement
Year	2003
Volume	30
Pages	189-197
Author	Manmohan S Sohu VS Mavi GS
Abstract	Ten genetically diverse bread wheat cultivars (PBW138, PBW435, PBW154, PBW443, PBW373, PBW445, PBW466, Cetia, Weaver and HP1731) with varying degrees of heat tolerance were crossed in all possible combinations to produce 90 crosses (including reciprocals). Hybrids and parents were evaluated for various yield contributing characters under heat stress (E1) and non-stress (E2) environments. Both additive and dominance components of variance were significant for most of the traits both in E1 and E2. Overdominance was observed for number of spikelets per spike (E1 and E2), grain yield (E1) and 1000-grain weight (E1). Both dominant and recessive alleles appeared to contribute towards the expression of these traits. The predominance of dominant genes was observed for the majority of the traits among parents. Combining ability analysis revealed the significance of both general (gca) and specific (sca) combining ability variances in both environments for number of spikes per plant, number of grains per spike, number of spikelets per spike, grain yield, and 1000-grain weight, except sca for number of grains per spike in E2. Reciprocal cross effects were also found to be significant for all traits except for 1000-grain weight in E1. The parent HP1731 was the best general combiner and PBW 373 was a good general combiner for number of spikes per plant and grain yield in E2. Weaver was the best general combiner for number of grains per spike and number of spikelets per spike, followed by HP 1731. To exploit both additive and dominance gene actions, biparental mating and diallel selective mating approaches are suggested
Keyword	[ Hide all but 1 of 21 ] allele combining ability crop yield cross cultivar dominance environment general combining ability genetic effects genetic variance heat stress heat tolerance hybrid plant breeding seed seed weight specific combining ability spikelets spikes stress yield components

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