Sharma Aayush, Taybi Tahar
School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.
Int J Mol Sci. 2025 May 27;26(11):5141. doi: 10.3390/ijms26115141.
To unravel the mechanisms underpinning salt tolerance, different studies have attempted to determine the physiological and genetic variations behind the difference in salt tolerance between and the salt-tolerant (). Most of these studies were limited to a specific duration of salt treatment and neglected the time response as a possible contributing factor to the higher salt tolerance exhibited by . In this work, a comprehensive and detailed comparison of the response of the two species to high salinity was conducted at different times for up to ten days of salt treatment. responded more rapidly and to a higher extent to adjust its metabolism and showed constitutive levels of anticipatory metabolism to salinity. responded more rapidly in terms of maintaining light use efficiency, limiting the uptake of Na, and increasing the accumulation of sugars and proline when exposed to salinity. had much higher constitutive levels of metabolites, including malate, proline, and inositol, in comparison to . Interestingly, showed a reduction in malate levels under salt treatment in contrast to . These results suggest that constitutive levels and the rapidity of the deployment of resistance mechanisms, together with metabolic plasticity, in response to salt stress are important adaptive traits for salt tolerance in plants.
为了揭示耐盐性背后的机制，不同的研究试图确定[物种名称1]和耐盐的[物种名称2]（[物种名称2]）之间耐盐性差异背后的生理和遗传变异。这些研究大多局限于特定时长的盐处理，而忽略了时间响应这一可能导致[物种名称2]表现出更高耐盐性的因素。在这项研究中，对这两个物种在长达十天的不同盐处理时间下对高盐度的响应进行了全面而详细的比较。[物种名称2]响应更快且程度更高地调整其代谢，并显示出对盐度的预期代谢组成水平。[物种名称2]在暴露于盐度时，在维持光利用效率、限制钠的吸收以及增加糖分和脯氨酸的积累方面响应更快。与[物种名称1]相比，[物种名称2]具有更高的包括苹果酸、脯氨酸和肌醇在内的代谢物组成水平。有趣的是，与[物种名称1]相反，[物种名称2]在盐处理下苹果酸水平降低。这些结果表明，响应盐胁迫时抗性机制的组成水平和快速部署，以及代谢可塑性，是植物耐盐性的重要适应性状。
