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GrainGenes Reference Report: SAR-20-517

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Reference	SAR-20-517
Title	Selection differential and genetic gain for grain yield in wheat
Journal	Sarhad Journal of Agriculture
Year	2004
Volume	20
Pages	517-522
Author	Khalil IH Arifa F Hidayar uR Fazle S
Abstract	Yield data from 3 consecutive breeding trials (A, B and Microplot) in Nowshera, Pakistan, from 1992 to 2003, were analysed as 2 independent selection phases to compute the selection differentials and genetic gains for each pair of years. Phase I consisted of wheat line evaluation and selection in the A trials with progeny-testing the following year in the B trials, while Phase II comprised of wheat line evaluation and selection in the B trials with progeny-testing the following year in the Microplot trials. The number of wheat lines evaluated in the A trials ranged from 126 to 378 per year with a selection intensity of 10-28% while in the B-trials the number of evaluated wheat lines ranged from 90 to 198 with a selection intensity of 6-22%. Averaged across 10 years, the mean selection differential and genetic gain were 268 (Phase II) and 180 kg/ha (Phase I). The relationship between selection differential and genetic gain was non-existent in either phase. The selection for grain yield was comparatively more effective in Phase II with a realized heritability of 0.49 than in Phase I with a moderate realized heritability of 0.36
Keyword	crop yield [ Show all 14 ]

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