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首页> 外文期刊>Trends in Plant Science >Freezing tolerance by vesicle-mediated fructan transport.
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Freezing tolerance by vesicle-mediated fructan transport.

机译：通过囊泡介导的果聚糖运输的耐冻性。

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摘要

Fructans are fructose-based polymers associated with freezing tolerance. They might act directly via membrane stabilization or indirectly by stimulating alternative cryoprotectants. Fructans and fructan biosynthetic enzymes, in general, are believed to be present in the vacuole. This paper draws particular attention to the surprising presence of fructans and fructan exohydrolase activity in the apoplast of cold-stressed plants. This observation raises questions concerning the origin of apoplastic fructans and suggests that fructans are transported to the apoplast by post-synthesis mechanisms, perhaps induced by cold. We propose a conceptual vesicle-mediated transport model for the movement of vacuolar fructans to the apoplast, where they could assist in stabilizing the plasma membrane.
机译：果糖是与耐冻性相关的基于果糖的聚合物。它们可能直接通过膜稳定作用，或通过刺激其他防冻剂间接起作用。通常认为果聚糖和果聚糖生物合成酶存在于液泡中。本文特别注意了冷胁迫植物的质外体中果聚糖和果聚糖外切水解酶活性的惊人存在。该观察结果引起了关于质外生果聚糖的起源的疑问，并表明果聚糖是通过合成后的机制（可能是由于寒冷引起的）被运输到质外体的。我们提出了液泡果聚糖向质外体运动的概念性囊泡介导的运输模型，在那里它们可以帮助稳定质膜。

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