Identification and Validation of QTL for Grain Quality Traits in a Cross of Soft Wheat Cultivars Pioneer Brand 25R26 and Foster
- Nathan Smitha,
- Mary Guttieria,
- Edward Souzab,
- Jenny Shootsa,
- Mark Sorrellsc and
- Clay Sneller *a
End-use quality is vital to the wheat (Triticum aestivum L.) industry. Understanding the genetics of components of quality is needed for efficient genetic improvement. Our objectives were to determine the genetics of soft wheat quality in a population derived from soft wheat cultivars and to validate the results. We developed 171 families from the cross ‘Foster’ × Pioneer ‘25R26’ and obtained quality data from four environments. We assessed flour yield (FY) and flour protein (FP), softness equivalent (SE), and water (WA), sodium carbonate (SO), sucrose (SU), and lactic acid (LA) solvent retention capacities (SRCs). Families were genotyped with markers and quantitative trait loci (QTL) analyses were performed. All traits were heritable (0.71– 0.93) and transgressive segregants were noted. The traits FY, WA, SO, and SU were correlated to one another as were SE and FP. A total of 29 QTL were detected from 11 genomic regions. Quantitative trait loci for correlated traits were generally coincident. Two regions of chromosome 1B had the greatest effect on WA, SO, FY, and LA (r2 = 0.23 to 0.30); these QTL appeared to be associated with the 1BL.1RS rye (Secale cereale L.) translocation and the Glu-B1 locus. A region of chromosome 2B had the greatest effect on FP, SE, and SU (r2 = 0.13 to 0.23). The 1B and 2B QTL were validated in crosses between each of the original mapping parents and ‘Hopewell’. We documented the relative importance for soft wheat quality of two known regions of 1B and report on a novel QTL on 2B. Marker-assisted selection for these three regions could have a significant impact on soft wheat quality.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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