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首页> 外文期刊>Journal of Experimental Botany >An inland and a coastal population of the Mediterranean xero-halophyte species Atriplex halimus L. differ in their ability to accumulate proline and glycinebetaine in response to salinity and water stress
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An inland and a coastal population of the Mediterranean xero-halophyte species Atriplex halimus L. differ in their ability to accumulate proline and glycinebetaine in response to salinity and water stress

机译：地中海盐生盐植物Atriplex halimus L.的内陆和沿海人口响应盐分和水分胁迫而积累脯氨酸和甘氨酸甜菜碱的能力不同

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摘要

Soil salinity and drought compromise water uptake and lead to osmotic adjustment in xero-halophyte plant species. These important environmental constraints may also have specific effects on plant physiology. Stress-induced accumulation of osmocompatible solutes was analysed in two Tunisian populations of the Mediteranean shrub Atriplex halimus L.—plants originating from a salt-affected coastal site (Monastir) or from a non-saline semi-arid area (Sbikha)—were exposed to nutrient solution containing either low (40 mM) or high (160 mM) doses of NaCl or 15% polyethylene glycol. The low NaCl dose stimulated plant growth in both populations. Plants from Monastir were more resistant to high salinity and exhibited a greater ability to produce glycinebetaine in response to salt stress. Conversely, plants from Sbikha were more resistant to water stress and displayed a higher rate of proline accumulation. Proline accumulated as early as 24 h after stress imposition and such accumulation was reversible. By contrast, glycinebetaine concentration culminated after 10 d of stress and did not decrease after the stress relief. The highest salt resistance of Monastir plants was not due to a lower rate of Na+ absorption; plants from this population exhibited a higher stomatal conductance and a prodigal water-use strategy leading to lower water-use efficiency than plants from Sbikha. Exogenous application of proline (1 mM) improved the level of drought resistance in Monastir plants through a decrease in oxidative stress quantified by the malondialdehyde concentration, while the exogenous application of glycinebetaine improved the salinity resistance of Sbikha plants through a positive effect on photosystem II efficiency.
机译：土壤盐分和干旱影响水分吸收并导致干盐植物植物物种的渗透调节。这些重要的环境制约因素也可能对植物生理产生特定影响。暴露了两个突尼斯地中海灌木灌木滨藜（Atriplex halimus L.）的胁迫诱导的渗透性溶质的积累-来自盐灾沿海地区（莫纳斯提尔）或非盐半干旱地区（Sbikha）的植物到含有低剂量（40 mM）或高剂量（160 mM）的NaCl或15％聚乙二醇的营养液中。低NaCl剂量刺激了两个种群的植物生长。来自莫纳斯提尔（Monastir）的植物对高盐分具有更高的抗性，并表现出更大的响应盐胁迫产生甘氨酸甜菜碱的能力。相反，来自Sbikha的植物对水分胁迫的抵抗力更高，并且脯氨酸的积累速率更高。脯氨酸早在施加压力后24小时就积累起来，并且这种积累是可逆的。相比之下，甘氨酸甜菜碱浓度在压力10 d后达到顶点，而在应力释放后并未降低。莫纳斯提尔植物的最高耐盐性不是由于Na + 的吸收率较低。与来自Sbikha的植物相比，来自该种群的植物表现出更高的气孔导度和超前的用水策略，导致较低的用水效率。脯氨酸（1 mM）的外源施用通过降低丙二醛浓度量化的氧化胁迫而改善了莫纳斯提尔植物的抗旱性，而外源施用甘氨酸甜菜碱则通过对光系统II效率产生积极影响而提高了Sbikha植物的耐盐性。 。

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