Silicon prevents aluminum from entering root tip by promoting formation of root border cells in rice

Bibliographische Detailangaben
Veröffentlicht in:	Plant physiology and biochemistry : PPB. - 1991. - 175(2022) vom: 15. März, Seite 12-22
1. Verfasser:	Xiao, Zhuoxi (VerfasserIn)
Weitere Verfasser:	Liang, Yongchao
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2022
Zugriff auf das übergeordnete Werk:	Plant physiology and biochemistry : PPB
Schlagworte:	Journal Article Aluminum Mucilage Root border cells Root tip Silicon

Beschreibung
Zusammenfassung:	Copyright © 2022 Elsevier Masson SAS. All rights reserved. Root border cells (RBCs) and their mucilage are considered to play an important role in protecting root tip from aluminum (Al) toxicity, but their interactions with silicon (Si) under Al stress still remain unclear. Here, we investigated the effect of Si on the formation of RBCs under Al stress and the related detoxification mechanism in hydroponically grown rice (Oryza sativa L.). The results showed that Si could prevent the separation of RBCs from each other by increasing the degree of pectin methylesterification in root tip cell wall, thereby keeping more RBCs around the root tip. Also, Si maintained the viability of RBCs, increased the amount of mucilage, and reduced the content of total Al and free Al in root tips. Moreover, the RBCs accumulated more Al and Si simultaneously than root tip in the Al treatments with Si supply. Overall, these results indicated that Si reduced the toxicity of Al to RBCs through formation of Si-Al complex on the RBCs, thereby improving the viability of RBCs and promoting the secretion of mucilage. Concomitantly, Si, RBCs and their mucilage could form a protective sheath at the root tip, which prevented Al from diffusing into the root tip, thereby alleviating Al toxicity in rice root tips
Beschreibung:	Date Revised 19.10.2023 published: Print-Electronic Citation Status Publisher
ISSN:	1873-2690
DOI:	10.1016/j.plaphy.2022.02.003