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- W3203497873 abstract "Abstract To provide food security for a growing world population, it will be necessary to increase yields of staple crops such as wheat ( Triticum aestivum L.). Yield is a complex, polygenic trait influenced by grain weight and number, which are negatively correlated with one another. Spikelet number is an important determinant of grain number, but allelic variants impacting its expression are often associated with heading date, constraining their use in wheat germplasm that must be adapted for specific environments. Identification and characterization of genetic variants affecting spikelet number will increase selection efficiency through their deployment in breeding programs.In this study, a quantitative trait locus (QTL) on chromosome arm 6BL for spikelet number was identified and validated using an association mapping panel, a recombinant inbred line population, and seven derived heterogeneous inbred families. The superior allele, QSn.csu-6Bb, was associated with an increase of 0.248 to 0.808 spikelets per spike across multiple environments that varied for mean spikelet number. Despite epistatic interactions between QSn.csu-6B and three other loci ( WAPO-A1 , VRN-D3 and PPD-B1 ) , genotypes with a greater number of superior alleles at these loci consistently exhibit higher spikelet number. The frequency of superior alleles at these loci varies among winter wheat varieties adapted to different latitudes of the United States Great Plains, revealing opportunities for breeders to select for increased spikelet number using simple molecular markers. This work lays the foundation for the positional cloning of the genetic variant underlying the QSn.csu-6B QTL to strengthen our understanding of spikelet number determination in wheat." @default.
- W3203497873 created "2021-10-11" @default.
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- W3203497873 date "2021-10-01" @default.
- W3203497873 modified "2023-10-16" @default.
- W3203497873 title "Identification and Validation of a QTL for Spikelet Number on Chromosome Arm 6BL of Common Wheat (Triticum Aestivum L.)" @default.
- W3203497873 doi "https://doi.org/10.21203/rs.3.rs-769537/v1" @default.
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