A silicon transporter in rice
A silicon transporter in rice
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DOI：
10.1038/nature04590
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发表时间：
2006-03-30
期刊：
影响因子：
64.8
通讯作者：
Yano, M
中科院分区：
文献类型：
--
作者：
Ma, JF;Tamai, K;Yano, M
硅对植物生长有益，并通过防止倒伏（跌倒）和提高对害虫和疾病以及其他胁迫的抗性来帮助植物克服非生物和生物胁迫（1-3）。硅对于水稻的高产和可持续生产至关重要（4），但负责硅吸收的分子机制尚不清楚。在这里，我们描述了低硅水稻1（Lsi 1）基因，控制硅的积累在水稻，一个典型的硅积累植物。该基因属于水通道蛋白家族（5），并在根中组成型表达。Lsi 1定位于外皮层和内皮层细胞远端侧的质膜上，凯氏带位于此处。抑制Lsi 1表达导致硅摄取减少。此外，在非洲爪蟾卵母细胞中表达的Lsi 1只表现出硅的运输活性。硅转运蛋白的鉴定提供了对植物中硅吸收系统的深入了解，以及通过遗传修饰根的硅吸收能力来生产对多种胁迫具有高抗性的作物的新策略。
Silicon is beneficial to plant growth and helps plants to overcome abiotic and biotic stresses by preventing lodging ( falling over) and increasing resistance to pests and diseases, as well as other stresses(1-3). Silicon is essential for high and sustainable production of rice(4), but the molecular mechanism responsible for the uptake of silicon is unknown. Here we describe the Low silicon rice 1 (Lsi1) gene, which controls silicon accumulation in rice, a typical silicon-accumulating plant. This gene belongs to the aquaporin family(5) and is constitutively expressed in the roots. Lsi1 is localized on the plasma membrane of the distal side of both exodermis and endodermis cells, where casparian strips are located. Suppression of Lsi1 expression resulted in reduced silicon uptake. Furthermore, expression of Lsi1 in Xenopus oocytes showed transport activity for silicon only. The identification of a silicon transporter provides both an insight into the silicon uptake system in plants, and a new strategy for producing crops with high resistance to multiple stresses by genetic modification of the root's silicon uptake capacity.