Dissecting the genetic control of natural variation in sorghum photosynthetic response to drought stress.
Dissecting the genetic control of natural variation in sorghum photosynthetic response to drought stress.
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DOI：
10.1093/jxb/erab502
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发表时间：
2022-05-23
影响因子：
6.9
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中科院分区：
文献类型：
--
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多个基因组区域解释了高粱对非胁迫和干旱胁迫的固碳反应的差异，其中一些区域同时控制着多个性状。干旱胁迫在全球范围内造成作物产量损失。高粱是一种耐中度干旱胁迫的C4植物，其在水分限制条件下的光合作用性状具有广泛的自然变异，可用于培育抗逆性强的品种。本研究的目的是寻找在花前水分限制条件下控制高粱光合作用能力的基因/基因组区域。我们对对照(30%)、干旱(15%)和恢复(30%)三个土壤体积含水率(VWC)时期的7个光合作用气体交换和叶绿素荧光特性进行了全基因组关联研究。水分胁迫是通过自动灌溉系统施加的，该系统为所有植物产生受控的枯水期，以执行无偏见的基因比较。在特定的处理中，共有60个基因组区域与一个或多个光合作用性状的自然变异或与衍生变量有关。我们确定了33个有希望的候选基因，它们的预测功能与应激信号、氧化应激保护、荷尔蒙应激反应和脱水保护有关。我们的结果为高粱光合作用对干旱响应的自然变异和遗传控制提供了新的认识，最终目的是提高高粱在水分胁迫情景下的适应性和生产力。
Multiple genomic regions explain variation in the carbon fixation response to non-stress and drought stress in Sorghum bicolor, with some of these regions simultaneously controlling multiple traits. Drought stress causes crop yield losses worldwide. Sorghum is a C4 species tolerant to moderate drought stress, and its extensive natural variation for photosynthetic traits under water-limiting conditions can be exploited for developing cultivars with enhanced stress tolerance. The objective of this study was to discover genes/genomic regions that control the sorghum photosynthetic capacity under pre-anthesis water-limiting conditions. We performed a genome-wide association study for seven photosynthetic gas exchange and chlorophyll fluorescence traits during three periods of contrasting soil volumetric water content (VWC): control (30% VWC), drought (15% VWC), and recovery (30% VWC). Water stress was imposed with an automated irrigation system that generated a controlled dry-down period for all plants, to perform an unbiased genotypic comparison. A total of 60 genomic regions were associated with natural variation in one or more photosynthetic traits in a particular treatment or with derived variables. We identified 33 promising candidate genes with predicted functions related to stress signaling, oxidative stress protection, hormonal response to stress, and dehydration protection. Our results provide new knowledge about the natural variation and genetic control of sorghum photosynthetic response to drought with the ultimate goal of improving its adaptation and productivity under water stress scenarios.
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