Most plant species, including most crops, perform poorly in salt-affected soils because high sodium levels are cytotoxic and can disrupt uptake of water and important nutrients. Halophytes are species that have evolved adaptations to overcome these challenges and may be a useful source of knowledge for salt tolerance mechanisms and genes that may be transferable to crop species. The salt content of saline habitats can vary dramatically by location, providing ample opportunity for different populations of halophytic species to adapt to their local salt concentrations; however, the extent of this variation, and the physiology and polymorphisms that drive it, remain poorly understood. Differential accumulation of inorganic elements between genotypes or populations may play an important role in local salinity adaptation. To test this, we investigated the relationships between population structure, tissue ion concentrations (i.e., ionomic profiles) and salt tolerance in 17 fine-textured genotypes of the halophytic turfgrass seashore paspalum (Paspalum vaginatum Swartz). A high-throughput ionomics pipeline was used to quantify the shoot concentration of 18 inorganic elements across three salinity treatments. We found a significant relationship between population structure and ion accumulation, with strong correlations between principal components derived from genetic and ionomic data. Additionally, genotypes with higher salt tolerance accumulated more K and Fe and less Ca than less tolerant genotypes. Together these results indicate that differences in ion accumulation between P. vaginatum populations may reflect locally adapted salt stress responses.

中文翻译：

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雀Pa体内元素积累的种内变化及其与耐盐性的关系

多数植物物种，包括大多数农作物，在受盐影响的土壤中表现不佳，因为高的钠含量具有细胞毒性，并且可以破坏水和重要营养素的吸收。盐生植物是为适应这些挑战而进化适应的物种，可能是耐盐机制和可转移到作物物种的基因的有用知识来源。盐碱生境的盐含量因位置而异，为不同种类的盐生植物提供了充分的机会来适应其当地盐浓度；然而，这种变化的程度以及驱动它的生理学和多态性仍然知之甚少。基因型或种群之间无机元素的差异积累可能在局部盐度适应中起重要作用。为了测试这个紫lum阴道斯华兹）。高通量的经济学研究流水线用于量化三种盐度处理中18种无机元素的芽浓度。我们发现种群结构与离子积累之间存在显着的关系，而从遗传和ionomic数据得出的主要成分之间具有很强的相关性。此外，与耐盐性较低的基因型相比，耐盐性较高的基因型累积更多的K和Fe，而减少Ca。这些结果共同表明，阴道假单胞菌种群之间离子积累的差异可能反映了局部适应的盐胁迫反应。