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Genetic control of the root system in rice under normal and drought stress conditions by genome-wide association study

机译：全基因组关联研究在正常和干旱胁迫条件下水稻根系的遗传控制

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A variety of adverse conditions including drought stress severely affect rice production. Root system plays a critical role in drought avoidance, which is one of the major mechanisms of drought resistance. In this study, we adopted genome-wide association study (GWAS) to dissect the genetic basis controlling various root traits by using a natural population consisting of 529 representative rice accessions. A total of 413 suggestive associations, containing 143 significant associations, were identified for 21 root traits, such as maximum root length, root volume, and root dry weight under normal and drought stress conditions at the maturation stage. More than 80 percent of the suggestive loci were located in the region of reported QTLs for root traits, while about 20 percent of suggestive loci were novel loci detected in this study. Besides, 11 reported root-related genes, including DRO1, WOX11, and OsPID, were found to co-locate with the association loci. We further proved that the association results can facilitate the efficient identification of causal genes for root traits by the two case studies of Nal1 and OsJAZ1. These loci and their candidate causal genes provide an important basis for the genetic improvement of root traits and drought resistance.
机译：包括干旱胁迫在内的各种不利条件严重影响水稻生产。根系在避免干旱中起着至关重要的作用，这是抗旱的主要机制之一。在这项研究中，我们采用全基因组关联研究（GWAS），通过使用由529个代表性水稻种质组成的自然种群来剖析控制各种根系性状的遗传基础。在成熟期正常和干旱胁迫条件下，共鉴定了413个暗示性关联，其中包含143个重要关联，这些21个根性状包括最大根长，根体积和根干重。超过80％的提示基因座位于已报告的根性状QTL区域，而约20％的提示基因座是本研究中检测到的新基因座。此外，发现11个报道的与根相关的基因，包括DRO1，WOX11和OsPID，与该基因座共定位。通过Nal1和OsJAZ1的两个案例研究，我们进一步证明了关联结果可以促进根性状的因果基因的有效鉴定。这些基因座及其候选致病基因为根系性状的遗传改良和抗旱性提供了重要的基础。

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