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CROP BREEDING & GENETICS

Trait Associations at the Xgwm 261 and Rht-B1 Loci in Two Winter Wheat Recombinant Inbred Line Populations

Soil and Crop Sciences Dep., Colorado State Univ., Fort Collins, CO 80523. Research supported through funding from Colorado Agric. Exp. Stn. Projects 795 and 646, the Colorado Wheat Administrative Committee, and the Colorado Wheat Research Foundation

^* Corresponding author (scott.haley{at}colostate.edu).

Microsatellite marker locus Xgwm 261 has been associated with reduced plant height attributed to the linked gibberellic acid (GA) sensitive Rht8c allele in wheat (Triticum aestivum L.). Our objective was to determine effects of allelic variation at the Xgwm 261 and Rht-B1 loci in two winter wheat recombinant inbred line (RIL) populations. ‘Longhorn’/‘Akron’ and Longhorn/‘Yuma’ RIL populations were evaluated in controlled environments for GA sensitivity and coleoptile length and were grown in Colorado at five locations for 2 yr for agronomic evaluation. Microsatellite markers were used to identify alleles at the Xgwm 261 and Rht-B1 loci. In both populations, the Rht-B1b class showed reduced plant height (8.9% average), GA sensitivity (average 73.5%), coleoptile length (average 11.3%), and test weight (average 1.9%) relative to the Rht-B1a class. In the Longhorn/Yuma population, Rht-B1b and Xgwm 261 165-bp classes were shorter than the Xgwm 261 210-bp and Rht-B1a classes. Increased GA sensitivity and coleoptile length of the Xgwm 261 165-bp class were observed, although only in the Rht-B1a background. Plant height of the Xgwm 261 165-bp + Rht-B1a combination was intermediate to the shorter Xgwm 261 165-bp + Rht-B1b and the taller Xgwm 261-210-bp + Rht-B1a combinations. No negative associations attributed to the Xgwm 261 165-bp allele were observed. Our results suggest that the Xgwm 261 165-bp allele may provide reduced plant height, increased coleoptile length, and increased test weight when combined in a background with the Rht-B1a allele.

Abbreviations: GA, gibberellic acid • PCR, polymerase chain reaction • RIL, recombinant inbred line