在水分充足和水分胁迫条件下对一个玉米-大刍草群体的开花时间进行QTL定位。
QTL mapping for flowering time in a maize-teosinte population under well-watered and water-stressed conditions.
作者信息
Tang Huaijun, Zhang Renyu, Wang Min, Xie Xiaoqing, Zhang Lei, Zhang Xuan, Liu Cheng, Sun Baocheng, Qin Feng, Yang Xiaohong
机构信息
State Key Laboratory of Plant Environmental Resilience and National Maize Improvement Center of China, China Agricultural University, Beijing, 100193 China.
Institute of Grain Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, 830091 China.
出版信息
Mol Breed. 2023 Aug 17;43(9):67. doi: 10.1007/s11032-023-01413-0. eCollection 2023 Sep.
UNLABELLED
Maize grain yield can be greatly reduced when flowering time coincides with drought conditions, which delays silking and consequently increases the anthesis-silking interval. Although the genetic basis of delayed flowering time under water-stressed conditions has been elucidated in maize-maize populations, little is known in this regard about maize-teosinte populations. Here, 16 quantitative trait loci (QTL) for three flowering-time traits, namely days to anthesis, days to silk, and the anthesis-silking interval, were identified in a maize-teosinte introgression population under well-watered and water-stressed conditions; these QTL explained 3.98-32.61% of phenotypic variations. Six of these QTL were considered to be sensitive to drought stress, and the effect of any individual QTL was small, indicating the complex genetic nature of drought resistance in maize. To resolve which genes underlie the six QTL, 11 candidate genes were identified via colocalization analysis of known associations with flowering-time-related drought traits. Among the 11 candidate genes, five were found to be differentially expressed in response to drought stress or under selection during maize domestication, and thus represented the most likely candidates underlying the drought-sensitive QTL. The results lay a foundation for further studies of the genetic mechanisms of drought resistance and provide valuable information for improving drought resistance during maize breeding.
SUPPLEMENTARY INFORMATION
The online version contains supplementary material available at 10.1007/s11032-023-01413-0.
未标注
当开花期与干旱条件同时出现时，玉米籽粒产量会大幅降低，干旱会延迟吐丝，进而增加开花-吐丝间隔。虽然在玉米-玉米群体中已经阐明了水分胁迫条件下开花时间延迟的遗传基础，但在这方面关于玉米-大刍草群体的了解却很少。在此，在水分充足和水分胁迫条件下，在一个玉米-大刍草渐渗群体中鉴定出了与三个开花时间性状相关的16个数量性状位点（QTL），即开花天数、吐丝天数和开花-吐丝间隔；这些QTL解释了3.98%-32.61%的表型变异。其中6个QTL被认为对干旱胁迫敏感，且任何单个QTL的效应都较小，这表明玉米抗旱性的遗传性质复杂。为了确定这6个QTL的潜在基因，通过与开花时间相关干旱性状的已知关联进行共定位分析，鉴定出了11个候选基因。在这11个候选基因中，发现有5个在对干旱胁迫的响应中或在玉米驯化过程中处于选择状态下差异表达，因此代表了干旱敏感QTL的最有可能的候选基因。这些结果为进一步研究抗旱遗传机制奠定了基础，并为玉米育种过程中提高抗旱性提供了有价值的信息。
补充信息
在线版本包含可在10.1007/s11032-023-01413-0获取的补充材料。
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