To explore the mechanisms responsible for salt tolerance in Brassicaceae species, a multifactorial approach was used to clarify the functional traits underlying the differential salt tolerance in two Lepidium species, namely the halophyte L. latifolium and its glycophyte relative, L. sativum. Parameters related to photosynthesis, nitrogen assimilation, ion accumulation, water relations and succulence, osmotic adjustment, phenolics metabolism, antioxidative defense, nitric oxide (NO) level and the expression of Na+ antiporter (SOS1 and NHX) were analyzed in plants grown under salt stress in hydroponics. In addition to significant differences regarding the majority of salt tolerance indicators, a characteristic early boost, 52 h after exposure to salt, was observed in the concentration of H2O2 and NO in the halophyte, which was almost absent in the glycophyte. Following the application of detrended component analysis, discrimination between the glycophyte and halophyte could only be performed via temporal curves in the antioxdative components and NO, and less effectively, by phenolics metabolism. H2O2 and NO signaling and the adaptive modification of phenolics metabolism play crucial roles in determining the halophytic behavior of L. latifolium. These data may result in new insights concerning the studies on halophytism in the Brassicaceae.

中文翻译：

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Lepidium 物种不同耐盐性背后的差异功能性状

为了探索十字花科物种耐盐性的机制，采用多因素方法来阐明两种 Lepidium 物种（即盐生植物 L. latifolium 及其糖生植物亲缘植物 L. sativum）中差异耐盐性的功能特征。在盐胁迫下生长的植物中分析了与光合作用、氮同化、离子积累、水分关系和多汁性、渗透调节、酚类代谢、抗氧化防御、一氧化氮 (NO) 水平和 Na+ 逆向转运蛋白 (SOS1 和 NHX) 表达相关的参数在水培中。除了大多数耐盐性指标存在显着差异外，在暴露于盐 52 小时后，在盐生植物中观察到 H2O2 和 NO 浓度的特征性早期升高，这在糖生植物中几乎不存在。在应用去趋势成分分析后，只能通过抗氧化成分和 NO 的时间曲线来区分糖生植物和盐生植物，而通过酚类代谢则效果较差。H2O2 和 NO 信号传导以及酚类代谢的适应性修饰在确定阔叶树的盐生植物行为中起着至关重要的作用。这些数据可能会导致有关十字花科盐生植物研究的新见解。H2O2 和 NO 信号传导以及酚类代谢的适应性修饰在确定阔叶树的盐生植物行为中起着至关重要的作用。这些数据可能会导致有关十字花科盐生植物研究的新见解。H2O2 和 NO 信号传导以及酚类代谢的适应性修饰在确定阔叶树的盐生植物行为中起着至关重要的作用。这些数据可能会导致有关十字花科盐生植物研究的新见解。