摘要： 为了解低磷胁迫下玉米产量性状的影响及其遗传基础,以玉米重组自交系为研究材料,分别在低磷处理和正常条件下,比较供试群体的产量及构成性状的变化,并运用复合区间作图法对其进行QTL定位。结果表明,单株产量、穗重和轴重等性状受低磷胁迫影响较大,出籽率、穗行数和粒深等性状受低磷胁迫影响较小;通径分析表明,低磷胁迫主要通过影响行粒数、百粒质量和粒深构成性状导致了单株产量的损失。在2种磷水平下共检测到23个产量及其构成性状QTL;单个QTL可解释的表型变异为4.32% ～14.77%;其中,标记区间bnlg666~umc1141 和umc1108~bnlg1258分布了不同性状的多个QTL。这些成簇分布QTL的染色体区域和低磷胁迫条件QTL,可为开展玉米耐低磷分子育种提供参考。

关键词: 玉米, 低磷胁迫, 产量, 通径分析, QTL

Abstract: To study the impact of phosphorus deficiency on maize yield, a RIL (recombination inbred lines) population was used for characterization of yield and its component under phosphorus deficiency and normal condition, and the resulting QTL mapping was also conducted by composite interval mapping.The results indicated that grain yield per plant, ear weight and cow weight were significantly impacted by low phosphorus stress, while kernel ratio, ear rows, kernel depth were less impacted by low phosphorus stress based on low phosphorus tolerance index (LPTI).Path analysis revealed that kernels per row was the main reason for yield decreasing, then followed by hundred kernel weight, kernel depth, and row number per ear.A total of 23 QTL were detected under two phosphorus levels.Each of these QTL could explain 4.32% to 14.77% phenotypic variation.Multiple QTL of different traits were co-localized on two chromosome regions covered by bnlg666-umc1141 and umc1108-bnlg1258, respectively.These QTL provide useful information for improving tolerance of low phosphorus in maize.

Key words: Maize, Low phosphorus stress, Yield, Path analysis, QTL

中图分类号: 

• S143.2

• S513.03