植物中硅的协同运输系统。

A cooperative system of silicon transport in plants.

机构信息

Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki 710-0046, Japan.

出版信息

Trends Plant Sci. 2015 Jul;20(7):435-42. doi: 10.1016/j.tplants.2015.04.007. Epub 2015 May 13.

DOI:10.1016/j.tplants.2015.04.007

Abstract

The high accumulation of silicon (Si) protects plants from biotic and abiotic stresses. Two different types of Si transporter [Low Silicon 1 (Lsi1) and 2 (Lsi2)] involved in the uptake and distribution of Si have been identified. Lsi1, a Si permeable channel, belongs to the Nod26-like major intrinsic protein (NIP) III subgroup of the aquaporin membrane protein family with a distinct selectivity, whereas Lsi2, an efflux Si transporter, belongs to an uncharacterized anion transporter family. These transporters are localized to the plasma membrane, but, in different plant species, show different expression patterns and tissue or cellular localizations that are associated with different levels of Si accumulation. A recent mathematical modeling study revealed that cooperation of Lsi1 and Lsi2, which show a polarized localization, is required for the efficient transport of Si in rice.

摘要

硅（Si）的大量积累可使植物免受生物和非生物胁迫的影响。现已鉴定出两种不同类型的 Si 转运蛋白[低 Si1（Lsi1）和 2（Lsi2）]，它们参与 Si 的摄取和分布。Lsi1 是一种 Si 通透通道，属于水通道蛋白家族的 Nod26 样主要内在蛋白（NIP）III 亚群，具有独特的选择性，而 Lsi2 是一种外排 Si 转运蛋白，属于未鉴定的阴离子转运蛋白家族。这些转运蛋白定位于质膜，但在不同的植物物种中，表现出不同的表达模式和组织或细胞定位，与不同水平的 Si 积累相关。最近的一项数学建模研究表明，在水稻中，高效运输 Si 需要具有极化定位的 Lsi1 和 Lsi2 的合作。