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首页> 外文期刊>Plant Molecular Biology >PIP aquaporin gene expression in arbuscular mycorrhizal Glycine max and Lactuca sativa plants in relation to drought stress tolerance
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PIP aquaporin gene expression in arbuscular mycorrhizal Glycine max and Lactuca sativa plants in relation to drought stress tolerance

机译：丛枝菌根大豆和紫花苜蓿植物PIP水通道蛋白基因表达与干旱胁迫耐受性的关系

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摘要

Although the discovery of aquaporins in plants has resulted in a paradigm shift in the understanding of plant water relations, the relationship between aquaporins and plant responses to drought still remains elusive. Moreover, the contribution of aquaporin genes to the enhanced tolerance to drought in arbuscular mycorrhisal (AM) plants has never been investigated. Therefore, we studied, at a molecular level, whether the expression of aquaporin-encoding genes in roots is altered by the AM symbiosis as a mechanism to enhance host plant tolerance to water deficit. In this study, genes encoding plasma membrane aquaporins (PIPs) from soybean and lettuce were cloned and their expression pattern studied in AM and nonAM plants cultivated under well-watered or drought stressed conditions. Results showed that AM plants responded to drought stress by down-regulating the expression of the PIP genes studied and anticipating its down-regulation as compared to nonAM plants. The possible physiological implications of this down-regulation of PIP genes as a mechanism to decrease membrane water permeability and to allow cellular water conservation is further discussed.
机译：尽管在植物中发现水通道蛋白导致对植物水关系的理解发生了范式转变，但水通道蛋白与植物对干旱的反应之间的关系仍然难以捉摸。此外，从未研究过水通道蛋白基因对丛枝菌根（AM）植物对干旱增强耐受性的作用。因此，我们在分子水平上研究了AM共生作为增强寄主植物对水分缺乏的耐受性的机制是否改变了根部水通道蛋白编码基因的表达。在这项研究中，克隆了编码大豆和生菜的质膜水通道蛋白（PIP）的基因，并研究了在水分充足或干旱胁迫条件下种植的AM和nonAM植物中的表达模式。结果表明，与非AM植物相比，AM植物通过下调所研究PIP基因的表达并预期其下调来应对干旱胁迫。 PIP基因的这种下调作为降低膜透水性和允许细胞节水的一种机制可能的生理意义进行了进一步的讨论。

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