Role of organic acids in sunflower tolerance to heavy metals

被引：37

作者：

Saber, NE ^{[1
]}

Abdel-Moneim, AM ^{[1
]}

Barakat, SY ^{[1
]}

机构：

[1] Univ Alexandria, Fac Sci, Dept Bot, Alexandria 21526, Egypt

来源：

BIOLOGIA PLANTARUM | 1999年 / 42卷 / 01期

关键词：

aluminium; cadmium; citric acid; fumaric acid; Helianthus annuus; malic acid; zinc;

D O I：

10.1023/A:1002115425544

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Exposure of Helianthus annuus L. seedlings to Al3+, Cd2+ or Zn2+ resulted in a marked decrease of fresh and dry masses of the shoots and the roots. The increase of Al3+, Cd2+ or Zn2+ uptake was accompanied by a significant decrease of nitrate, phosphorus and K+ uptake. There was a significant increase of malic and citric acid contents in the shoots and roots of heavy metal-treated seedlings whereas the change in fumaric acid was insignificant. Al3+ and Zn2+ alone stimulated excretion of malic and citric acids to the rhizosphere. Addition of high concentrations of malic or citric acid alleviate to some extent the inhibitory effect of Al3+ and Zn2+ on plant growth.

引用

页码：65 / 73

页数：9

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