Laboratory of Plant Protection and Improvement, Centre of Biotechnology of Sfax, Institute of Biotechnology, University of Sfax, Sfax, Tunisia.
Plant Signal Behav. 2011 Oct;6(10):1503-9. doi: 10.4161/psb.6.10.17088. Epub 2011 Oct 1.
Dehydrins (DHNs), or group 2 LEA (Late Embryogenesis Abundant) proteins, play a fundamental role in plant response and adaptation to abiotic stresses. They accumulate typically in maturing seeds or are induced in vegetative tissues following salinity, dehydration, cold, and freezing stress. The generally accepted classification of dehydrins is based on their structural features, such as the presence of conserved sequences, designated as Y, S, and K segments. The K segment representing a highly conserved 15 amino acid motif forming amphiphilic α-helix is especially important since it has been found in all dehydrins. Since more than 20 years, they are thought to play an important protective role during cellular dehydration but their precise function remains unclear. This review outlines the current status of the progress made towards the structural, physico-chemical and functional characterization of plant dehydrins and how these features could be exploited in improving stress tolerance in plants.
脱水素（DHN），或第 2 组 LEAs（晚期胚胎丰富）蛋白，在植物对非生物胁迫的响应和适应中起着至关重要的作用。它们通常在成熟种子中积累，或者在盐胁迫、脱水、寒冷和冷冻胁迫后在营养组织中诱导产生。脱水素的一般分类是基于它们的结构特征，如保守序列的存在，指定为 Y、S 和 K 片段。K 片段代表一个高度保守的 15 个氨基酸基序，形成两亲性 α-螺旋，这一点尤其重要，因为它存在于所有的脱水素中。20 多年来，人们认为它们在细胞脱水过程中起着重要的保护作用，但它们的确切功能仍不清楚。本文综述了在植物脱水素的结构、物理化学和功能特性方面取得的进展，并探讨了如何利用这些特性来提高植物的胁迫耐受性。
