Despite the fact that numerous loci for SEL in wheat have been reported, our knowledge on PH-independent loci remains to be limited. These eight QTL may be valuable for fine mapping and marker-assisted selection in wheat breeding programs.Ī novel, stably expressed, and plant height-independent QTL for spike extension length on 5AS was identified and validated in different populations using a newly developed and tightly linked KASP marker.Īs an important component of plant height (PH), spike extension length (SEL) plays a significant role in formation of an ideotype in wheat. Pleiotropic effects on yield-related traits (PH, spike length, spikelet number per spike, spikelet density, kernel number per spike, kernel length, and thousand kernel weight) of the eight major QTL were also evaluated. Further, plant height (PH) was measured to perform covariance QTL analysis with eight major QTL three of them derived from the wheat variety CM107 were not affected by PH.
Among these 13 QTL, nine were independent the other two pairs derived from H461 were validated to be common QTL based on newly developed high-resolution melt markers. Using two high-density genetic linkage maps, 13 putative QTL for PEL were detected on chromosomes 1B, 1D, 2B, 2D, 4A, 4B, 5B, 6D, 7A, and 7B each QTL explained 5.7–15.6% of the phenotypic variation. Two related recombinant inbred line populations sharing common parent H461 were used to identify and compare quantitative trait loci (QTL) controlling PEL. In this study we aimed to advance the current understanding of genetic mechanisms underlying panicle exsertion in wheat. The improvement of panicle exsertion length (PEL) in wheat (Triticum aestivum L.) breeding programs is an emerging objective to improve yield potential, and serves as a complement to the wheat ideotype.
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