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脂质分布、组成和流动性对复苏植物扇叶鞭苔木质部水分再填充的影响。

The impact of lipid distribution, composition and mobility on xylem water refilling of the resurrection plant Myrothamnus flabellifolia.

作者信息

Schneider H, Manz B, Westhoff M, Mimietz S, Szimtenings M, Neuberger T, Faber C, Krohne G, Haase A, Volke F, Zimmermann U

机构信息

Lehrstuhl für Biotechnologie, Biozentrum der Universität, Am Hubland, D-97074 Würzburg, Germany.

Fraunhofer Institut für Biomedizinische Technik, Ensheimer Strasse 48, D-66386 St Ingbert, Germany.

出版信息

New Phytol. 2003 Aug;159(2):487-505. doi: 10.1046/j.1469-8137.2003.00814.x.

Abstract

•  Lipids play a crucial role in the maintenance of the structural and functional integrity of the water-conducting elements and cells of the resurrection plant Myrothamnus flabellifolia during complete dehydration. •  Lipid composition, mobility and distribution within the internodal and nodal xylem regions (including short shoots and leaves) were investigated in the presence and absence of water by using various nuclear magnetic resonance (NMR) spectroscopy and imaging techniques differing greatly in the level of spatial resolution and acquisition of lipid parameters. •  Significant findings include: a discontinuity in the branch xylem between an inner zone where no water moves and an outer zone where the water moves; the blocking of water movement in the inner zone by lipids that are not dispersed by water, and the facilitation of water advance in the xylem elements and pits of the outer zone by water-dispersed lipids; the relative impermeability of leaf trace xylem to the rehydrating water and, hence, the relative hydraulic isolation of the leaves. •  These results elucidated part of the strategy used by the resurrection plant to cope with extreme drought and to minimize transpirational water loss upon hydration.

摘要

• 在完全脱水过程中,脂质在复苏植物扇叶鼠李木质部导水元件和细胞的结构与功能完整性维持方面发挥着关键作用。

• 通过使用空间分辨率水平和脂质参数获取方式差异极大的各种核磁共振(NMR)光谱和成像技术,研究了有水和无水情况下节间和节部木质部区域(包括短枝和叶片)内的脂质组成、流动性和分布。

• 重要发现包括:分支木质部中无水移动的内区和有水移动的外区之间存在间断;无水分散的脂质在内区阻止水分移动,而有水分散的脂质促进外区木质部元件和纹孔中的水分推进;叶迹木质部对复水的相对不渗透性,以及因此叶片相对的水力隔离。

• 这些结果阐明了复苏植物应对极端干旱并在水化时尽量减少蒸腾水分损失所采用策略的部分内容。

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