Salt stress impedes plant growth and disrupts normal metabolic processes, resulting in decreased biomass and increased leaf senescence. Therefore, the ability of a plant to maintain biomass when exposed to salinity stress is critical for the production of salt tolerant crops. To identify the genetic basis of salt tolerance in an agronomically important grain crop, we used a recombinant inbred line (RIL) population derived from an interspecific cross between domesticated Sorghum bicolor (inbred Tx7000) and a wild relative, Sorghum propinquum. A high-density genetic map was generated from 177 F3:5 RILs and covered the 10 Sorghum chromosomes with 1991 markers. The genetic map was used to identify 19 total QTL related to plant growth and overall health in optimal and saline conditions. Of these 19 QTL detected, 10 were specific to the salt stress response. The salt-responsive QTL contained numerous genes that have been previously shown to play a role in ionic tolerance, tissue tolerance, and osmotic tolerance, including many aquaporins.

中文翻译：

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种间高粱种群中的 QTL 定位揭示了耐盐性的候选调节因子

盐胁迫阻碍植物生长并破坏正常的代谢过程，导致生物量减少和叶片衰老增加。因此，植物在暴露于盐分胁迫时保持生物量的能力对于耐盐作物的生产至关重要。为了鉴定具有重要农艺意义的粮食作物耐盐性的遗传基础，我们使用了源自驯化双色高粱（近交 Tx7000）和野生近缘高粱的种间杂交的重组近交系 (RIL) 种群。从 177 个 F3:5 RIL 生成高密度遗传图谱，并用 1991 个标记覆盖了 10 个高粱染色体。该遗传图谱用于鉴定在最佳和盐碱条件下与植物生长和整体健康相关的 19 个总 QTL。在检测到的这 19 个 QTL 中，10 个是特定于盐胁迫反应的。盐响应 QTL 包含许多先前已被证明在离子耐受性、组织耐受性和渗透耐受性中起作用的基因，包括许多水通道蛋白。