Pang J, Chan G S Y, Zhang J, Liang J, Wong M H
College of Bioscience and Biotechnology, Yangzhou University, Yangzhou 225009, PR China.
Chemosphere. 2003 Sep;52(9):1559-70. doi: 10.1016/S0045-6535(03)00496-X.
Physiological aspects of why vetiver grass (Vetiveria zizanioides L.) can be tolerant to heavy metals and be used as an alternative method for rehabilitation of abandoned metalliferous mine wastelands have been investigated. The results showed that high proportions of lead and zinc (Pb/Zn) tailing greatly inhibited the leaf growth, dry matter accumulation, and photosynthesis of leaves, but stimulated the accumulation of proline and abscisic acid (ABA), and enhanced the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), implying that different mechanisms to detoxify active oxygen species (AOS) existed in different parts of plants. Physiological responses to heavy metal treatments differed greatly between roots and shoots. Nitrogen fertilizer application could greatly alleviate the adverse effects of high proportions of Pb/Zn tailing on vetiver grass growth.
香根草（Vetiveria zizanioides L.）为何能耐受重金属并用作废弃含金属矿山荒地修复替代方法的生理方面已得到研究。结果表明，高比例的铅锌（Pb/Zn）尾矿极大地抑制了叶片生长、干物质积累和叶片光合作用，但刺激了脯氨酸和脱落酸（ABA）的积累，并增强了超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）的活性，这意味着植物不同部位存在不同的活性氧解毒机制。根和地上部分对重金属处理的生理反应差异很大。施用氮肥可极大地缓解高比例Pb/Zn尾矿对香根草生长的不利影响。
