A doubled haploid population of 94 lines from the Chinese Spring × SQ1 wheat cross (CSDH) was used to evaluate additive and epistatic gene action effects on total phenolic content, grain yield of the main stem, grain number per plant, thousand grain weight, and dry weight per plant at harvest based on phenotypic and genotypic observations of CSDH lines. These traits were evaluated under moderate and severe drought stress and compared with well-watered plants. Plants were grown in pots in an open-sided greenhouse. Genetic parameters, such as additive and epistatic effects, affecting total phenolic content, were estimated for eight year-by-drought combinations. Twenty-one markers showed a significant additive effect on total phenolic content in all eight year-by-drought combinations. These markers were located on chromosomes: 1A, 1B, 2A, 2B, 2D, 3A, 3B, 3D, 4A, and 4D. A region on 4AL with a stable QTL controlling the phenolic content, confirmed by various statistical methods is particularly noteworthy. In all years and treatments, three markers significantly linked to QTLs have been identified for both phenols and yield. Thirteen markers were coincident with candidate genes. Our results indicated the importance of both additive and epistatic gene effects on total phenolic content in eight year-by-drought combinations.

译文

使用来自中国春季 × SQ1小麦杂交 (CSDH) 的94个品系的双倍单倍体种群来评估加性和上位性基因对总酚含量,主茎籽粒产量,单株籽粒数,千粒重的影响,根据CSDH系的表型和基因型观察,收获时每株植物的干重。在中度和重度干旱胁迫下评估了这些性状,并与浇水良好的植物进行了比较。植物生长在开放式温室的花盆中。估计了八年干旱组合的遗传参数,例如累加和上位效应,会影响总酚含量。在所有8年干旱组合中,21个标记对总酚含量均显示出显着的累加效应。这些标记位于染色体上: 1A,1B,2A,2B,2D,3A,3B,3D,4A和4D。通过各种统计方法证实,在4AL上具有控制酚含量的稳定QTL的区域特别值得注意。在所有年份和治疗中,已经确定了三种与qtl显着相关的酚类和产量标记。13个标记与候选基因一致。我们的结果表明,在八年干旱的组合中,加性和上位基因对总酚含量的影响都很重要。

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