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QTL mapping for flowering time in a maize-teosinte population under well-watered and water-stressed conditions

文献类型： 外文期刊

作者： Tang, Huaijun 1 ; Zhang, Renyu 1 ; Wang, Min 1 ; Xie, Xiaoqing 2 ; Zhang, Lei 2 ; Zhang, Xuan 1 ; Liu, Cheng 2 ; Sun, Baocheng 2 ; Qin, Feng 1 ; Yang, Xiaohong 1 ;

作者机构： 1.China Agr Univ, Natl Maize Improvement Ctr China, State Key Lab Plant Environm Resilience, Beijing 100193, Peoples R China

2.Xinjiang Acad Agr Sci, Inst Grain Crops, Urumqi 830091, Peoples R China

3.China Agr Univ, Frontiers Sci Ctr Mol Design Breeding, Beijing 100193, Peoples R China

关键词： Maize; Drought resistance; Flowering time; QTL mapping

期刊名称：MOLECULAR BREEDING （ 影响因子：3.1； 五年影响因子：3.1 ）

ISSN： 1380-3743

年卷期： 2023 年 43 卷 9 期

页码：

收录情况： SCI

摘要： 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.

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