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首页> 外文期刊>African Journal of Biotechnology >Long-term mannitol-induced osmotic stress leads to stomatal closure, carbohydrate accumulation and changes in leaf elasticity in Phaselous vulgaris leaves
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Long-term mannitol-induced osmotic stress leads to stomatal closure, carbohydrate accumulation and changes in leaf elasticity in Phaselous vulgaris leaves

机译：长期甘露醇诱导的渗透胁迫导致菜豆叶片气孔关闭，碳水化合物积累和叶片弹性变化

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摘要

The effect of long-term osmotic stress was investigated in leaves of two common bean lines, with contrasting tolerance: Flamingo (tolerant) and coco blanc (sensitive). Water relations, organic solute, ion accumulation and amino acids content as well as osmotic adjustment (OA) were studied during an extended exposure to osmotic stress. Osmotic stress was applied by means of 50 mM mannitol for 15 days. At the end of the stress period, both osmotic potential at full turgor (Ψ100) and at turgor loss point (Ψ0) decreased significantly in stressed plants compared with the control. The decrease being greater in the sensitive line, showed a greater OA compared with flamingo. Sugars contents increased in stressed plants and seem to be the major components of osmotic adjustment in stressed common bean leaves. The increase was more marked in coco blanc. Osmotic stress tolerance could thus not be associated with higher OA. The possible role of decreased leaf cell elasticity (εmax) is discussed in relation to osmotic stress tolerance in this species.
机译：在两种常见豆系的叶片中研究了长期渗透胁迫的影响，并具有相对的耐受性：火烈鸟（耐性）和可可白（敏感）。在长期暴露于渗透胁迫下，研究了水的关系，有机溶质，离子积累和氨基酸含量以及渗透调节（OA）。通过50mM甘露醇施加渗透胁迫15天。在胁迫期结束时，与对照相比，胁迫植物的全膨胀（Ψ100）和膨松损失点（Ψ0）的渗透势均显着降低。与火烈鸟相比，敏感线的下降幅度更大，显示出更大的OA。胁迫植物中糖含量增加，并且似乎是胁迫普通豆叶片中渗透调节的主要成分。这种增加在可可白中更为明显。因此，渗透压耐受性可能与较高的OA无关。讨论了降低叶片细胞弹性（εmax）可能与该物种的渗透胁迫耐受性有关的作用。

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