论文部分内容阅读
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。
In order to understand the effects of low-P stress on maize yield traits and their genetic basis, the maize recombinant inbred lines were used as experimental materials to compare the changes of yield and composition traits in low phosphorus treatments and normal conditions respectively. QTL mapping of the composite interval mapping method. The results showed that the characters of single plant yield, ear weight and axle weight were greatly affected by low P stress, and the seedling rate, ear number and grain depth were less affected by low P stress. Path analysis showed that low P stress Mainly through the impact of line grain number, grain quality and grain depth constitute traits led to the loss of yield per plant. Twenty-three QTLs for total yield and its traits were detected at two phosphorus levels. The phenotypic variation explained by a single QTL ranged from 4.32% to 14.77%. Among them, the marker interval bnlg666 ~ umc1141 and umc1108 ~ bnlg1258 distributed more traits QTLs. These QTLs for QTLs for chromosome QTLs clustered in QTLs could provide a reference for molecular breeding of low molecular weight phosphorus tolerant maize.