A QTL for early heading in wheat cultivar Suwon 92

Author： Xu Xiangyang Bai Guihua Carver Brett Shaner Gregory

ISSN： 0014-2336

Source： Euphytica, Vol.146, Iss.3, 2005-12, pp. : 233-237

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Abstract

Heading date is an important trait that determines wheat adaptation to environments. A recombinant inbred line (RIL) population derived from CI 13227 × Suwon 92 was employed to tag the quantitative trait locus (QTL) for early heading in Suwon 92. This population was phenotyped for heading date in 1994, 1995, and 1997, and analyzed with AFLP and SSR markers. Two AFLP markers (XGCTG.CGCT118 and XGCTG.CGCT60) closely associated with heading date were identified. Across years, XGCTG.CGCT118 and XGCTG.CGCT60 explained 40.4% and 32.2% of the total phenotypic variances, respectively. Interval analysis revealed a major QTL for heading date, designated QHd.pser-2DS, between AFLP marker XGCTG.CGCT118 and SSR marker Xgwm261. Based on the linkage map, QHd.pser-2DS was about 41.2 cM proximal to the distal end of chromosome 2DS, and explained 40.5% of the phenotypic variance across three years. The identified markers associated with the early heading QTL have the potential to be used in wheat breeding programs.