Protecting Cell Walls from Binding Aluminum by Organic Acids Contributes to Aluminum Resistance

Ya-Ying Li; Yue-Jiao Zhang; Yuan Zhou; Jian-Li Yang; Shao-Jian Zheng

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Protecting Cell Walls from Binding Aluminum by Organic Acids Contributes to Aluminum Resistance

机译：通过有机酸保护细胞壁免受铝结合，有助于提高铝的耐受性

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机译：Aluminum-induced secretion of organic acids from the root apex has been demonstrated to be one major AI resistance mechanism in plants. However, whether the organic acid concentration is high enough to detoxify AI in the growth medium is frequently questioned. The genotypes of Al-resistant wheat, Cassia tora L. and buckwheat secrete malate, citrate and oxalate, respectively. In the present study we found that at a 35% inhibition of root elongation, the AI activities in the solution were 10, 20, and 50 μM with the corresponding malate, citrate, and oxalate exudation at the rates of 15, 20 and 21 nmol/cm2 per 12 h, respectively, for the above three plant species. When exogenous organic acids were added to ameliorate Al toxicity, twofold and eightfold higher oxalate and malate concentrations were required to produce the equal effect by citrate. After the root apical cell walls were isolated and preincubated in 1 mM malate, oxalate or citrate solution overnight, the total amount of AI adsorbed to the cell walls all decreased significantly to a similar level, implying that these organic acids own an equal ability to protect the cell walls from binding AI. These findings suggest that protection of cell walls from binding Al by organic acids may contribute significantly to AI resistance.

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来源
《植物学报（英文版）》 |2009年第6期|574-580|共7页
作者
Ya-Ying Li; Yue-Jiao Zhang; Yuan Zhou; Jian-Li Yang; Shao-Jian Zheng;
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作者单位

Ministry of Agriculture Key Laboratory for Non-Point Pollution Control Zhejiang University Hangzhou 310029 China;

State Key Laboratory of Plant Physiology and Biochemistry College of Life Sciences Zhejiang University Hangzhou 310058 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类植物学;
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入库时间 2024-01-27 10:42:50

Protecting Cell Walls from Binding Aluminum by Organic Acids Contributes to Aluminum Resistance

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