Mapping Quantitative Trait Loci for Long Coleoptile in Chinese Wheat Landrace Wangshuibai

作者：Yu Jian Bin; Bai Gui Hua^*

来源：Crop Science, 2010, 50(1): 43-50.

DOI：10.2135/cropsci2009.02.0065

Wheat (Triticum aestivum L.) cultivars with long coleoptiles can be sown deeply for better seedling establishment in drought environments. A population of 139 recombinant inbred lines (RILs) from a cross between a long-coleoptile Chinese landrace, Wangshuibai, and short-coleoptile U.S. wheat cultivar, Wheaton, were characterized for coleoptile length and plant height. Heritabilities for coleoptile length were high (h(2) > 0.82). Interval mapping identified six significant quantitative trait loci (QTL) on 1B, 3D, 4DS, 4DL, 5AS, and 513 for coleoptile length; four of them, on 3D, 4DS, 4DL, and 5AS, showed pleiotropic effects on plant height. One major QTL for long coleoptile was mapped on the locus Rht-D1 (Rht2) for reduced height (Rht) on chromosome 4DS and explained up to 65% of phenotypic variation for coleoptile length. Another major QTL was located on 4DL and explained up to 33% of phenotypic variation for coleoptile length. Standard height allele RhtD1a from Wangshuibai appeared to have an epistatic effect on the 4DL QTL for long coleoptile. Other QTL showed only a minor effect. Although Rht-D1a explained a major portion of genetic variation for long coleoptile in Wangshuibai, a combination of Rht-D1a in Wangshuibai with gibberellic acid (GA)-sensitive Rht genes for reduced wheat height from other sources should be able to select long coleoptiles, semi-dwarf cultivars in wheat breeding programs for which long coleoptile is a breeding objective.

• 出版日期2010-2