Many halophytic physiological traits related to the tolerance of plants to salinity excess have been extensively studied, with a focus on biomass and/or gas exchange parameters. To gain a more complete understanding of whether salinity excess affects the physiological performance of halophytes, an experiment was performed using the halophyte Atriplex halimus L. as a model. A. halimus plants were subjected to two salinity treatments (171 and 513 mM NaCl) over 60 days in a controlled environment. After this period, dry biomass, specific stem conductivity, water potential at turgor loss point, osmotic potential, gas exchange parameters, and the fluorescence of chlorophyll a derived parameters were assessed in order to obtain knowledge about the differences in vulnerability that these parameters can show when subjected to salinity stress. Our results showed a decrease in belowground and aboveground biomass. The decrement in biomass seen at 513 mM NaCl was related to photosynthetic limitations and specific stem conductivity. Turgor loss point did not vary significantly with the increment of salinity. Therefore, the parameter that showed less vulnerability to saline stress was the turgor loss point, with only a 5% decrease, and the more vulnerable trait was the stem conductivity, with a reduction of nearly 50%.

中文翻译：

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生理特征脆弱性在确定盐生植物对盐度过量的耐受性中的重要性：滨藜的比较评估。


许多与植物对盐度过量的耐受性相关的盐生生理特征已被广泛研究，重点是生物量和/或气体交换参数。为了更全面地了解盐分过量是否影响盐生植物的生理性能，以盐生植物Atriplex halimus L.为模型进行了实验。在受控环境中，对A. halimus植物进行了 60 天的两次盐度处理（171 和 513 mM NaCl）。此后，对干生物量、特定茎电导率、膨压损失点水势、渗透势、气体交换参数和叶绿素a衍生参数的荧光进行了评估，以获得有关这些参数可以显示的脆弱性差异的知识当受到盐度胁迫时。我们的结果显示地下和地上生物量减少。 513 mM NaCl 下生物量的减少与光合作用限制和特定茎电导率有关。膨压损失点随盐度的增加没有显着变化。因此，对盐胁迫表现出较小脆弱性的参数是膨压损失点，仅降低了5%，而更脆弱的性状是茎电导率，降低了近50%。