Salicylic acid reduces cadmium (Cd) accumulation in rice (Oryza sativa L.) by regulating root cell wall composition via nitric oxide signaling

文献类型： 外文期刊

第一作者： Pan, Jiuyue

作者： Pan, Jiuyue;Guan, Meiyan;Xu, Ping;Chen, Mingxue;Cao, Zhenzhen

作者机构：

关键词： Rice (Oryza sativa L.); Cadmium; Salicylic acid; Pectin; Lignin; Nitric oxide

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 797 卷

页码：

收录情况： SCI

摘要： The effects of salicylic acid (SA) on cadmium (Cd) accumulation. Cd subcellular distribution, cell wall composition and Cd adsorption in Cd-stressed rice seedlings were examined. The interaction between SA and nitric oxide (NO) signaling in regulating cell wall composition under Cd exposure was also investigated. Our results showed that 5 mu mol.L-1 Cd treatment significantly decreased plant height, root length and plant dry weight by 40.1%. 46.1% and 21.3% (p < 0.05), respectively, and the inhibitory effects of Cd on the growth parameters were alleviated by exogenous SA. Application of SA remarkably decreased Cd concentrations in roots and shoots of rice seedlings by 48.0% and 19.6%. respectively, and increased the distribution ratio of Cd in the root cell wall fraction ( from 35.7% to 40.6%) compared with Cd treatment alone. The reduced Cd accumulation in rice plants could be attributed to that SA application promoted pectin synthesis and demethylesterification, thereby increasing Cd deposition in the root cell wall. Moreover, SA application promoted lignin biosynthesis to strengthen the cell wall and prevent Cd from entering the root cells. In addition, NO might be involved in SA-induced pectin synthesis, pectin demethylesterification and lignin biosynthesis as a downstream signaling molecule, contributing to reduced Cd accumulation in Cd-stressed rice seedlings. The results provide deep insights into the mechanisms of exogenous SA action in reducing Cd accumulation in rice plants. (C) 2021 Elsevier B.V. All rights reserved.

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