Transport of Silicon from Roots to Panicles in Plants

Overview

Journal Proc Jpn Acad Ser B Phys Biol Sci

Specialties Biology
Science

Date 2011 Jul 26

PMID 21785256

Citations 51

Authors

Jian Feng Ma

Naoki Yamaji

Namiki Mitani-Ueno

Affiliations

Soon will be listed here.

Abstract

Silicon (Si) is the most abundant minerals in soil and exerts beneficial effects on plant growth by alleviating various stresses. The transport of Si from soil to the panicles is mediated by different transporters. Lsi1, belonging to a NIP group of the aquaporin family, is responsible for the uptake of Si from soil into the root cells in both dicots and monocots although its expression patterns and cellular localization differ with plant species. The subsequent transport of Si out of the root cells towards the stele is medicated by an active efflux transporter, Lsi2. Lsi1 and Lsi2 are polarly localized at the distal and proximal sides, respectively, of both exodermis and endodermis in rice root. Silicon in the xylem sap is presented in the form of monosilicic acid and is unloaded by Lsi6, a homolog of Lsi1 in rice. Lsi6 is also involved in the inter-vascular transfer of Si at the node, which is necessary for preferential Si distribution to the panicles.

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