Tall wheatgrass [Elymus elongatus subsp. ponticus (Podp.) Melderis] is a C3 grass native from dry or saline habitats in SE Europe. The aim of this study was to better understand response mechanisms of populations from different origins to salinity and to provide new tools to select germoplasm with high salinity tolerance. Four populations (P3‐P4‐P5‐P9) were irrigated with five solutions of increasing salinity (Salt: 0–0.1–0.2–0.3–0.4 M NaCl) and evaluated in pots in a greenhouse. Two experiments were carried out, a short 40‐day long experiment with vegetative plants, and a longer 85‐day long one with plants that underwent vegetative‐reproductive stage. No evidence was found of an interaction between population and salt. Morpho‐physiological, biochemicals, isotopic and productive variables were differently affected by increasing salinity and were also different among populations. Proline, Na⁺ and Cl⁻ consistently appeared to function as osmotic agents. P5 showed the highest biomass in the 85‐day experiment and had the highest leaf length, tiller density, water use efficiency and δ¹³C isotope; and the lowest Cl⁻ concentration and evapotranspiration rate. However, P5 showed the lowest biomass in the 40‐day experiment, suggesting that duration of the stress is an important aspect to consider when selecting germoplasm for tolerance to salinity. Differences among populations in growth strategies and physiological mechanisms could be related to their origin environment.

中文翻译：

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高小麦草种群对盐胁迫的形态生理，生化和同位素响应

高大的小麦草[ Elymus elongatus亚种。庞蒂克斯（Podp。）Melderis]是一种C3草，原产于SE Europe的干旱或盐碱生境。这项研究的目的是更好地了解不同来源人群对盐分的响应机制，并为选择具有高盐分耐受性的种质提供新的工具。用五个增加盐度的溶液（盐：0–0.1–0.2–0.3–0.4 M NaCl）灌溉四个种群（P3-P4-P5-P9），并在温室盆中进行评估。进行了两项实验，其中一项是对植物性植物进行的为期40天的简短实验，另一项是进行了植物生殖期的植物的为时85天的较长实验。没有证据表明人口与盐之间存在相互作用。盐度增加对形态，生理，生化，同位素和生产变量的影响不同，并且在人群之间也不同。脯氨酸，钠⁺和Cl ^-始终以传播媒介的渗透剂。P5显示，在85天的实验生物量最高和具有最高的叶长，分蘖密度，水分利用效率和δ ¹³ C ^同位素; 和最低的氯^-浓度和蒸散速率。然而，P5在40天的实验中显示出最低的生物量，这表明在选择耐盐碱度的种质时，应注意的持续时间是一个重要方面。种群之间在生长策略和生理机制上的差异可能与其起源环境有关。