Zheng Hui-Qiong, Wei Ning, Wang Liu-Fa, He Ping
Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China.
Zhi Wu Sheng Li Yu Fen Zi Sheng Wu Xue Xue Bao. 2006 Apr;32(2):189-94.
Water hyacinth (Eichhornia crassipes) is one of the most productive plants, but is also a troublesome weed in the world. In order to protect the public water system from chemical herbicides pollution, biological method has been suggested to control the growth and the reproduction of this weed. Lantana (Lantana camara L.) is an important weed of the family Verbenaceae and its leaf extract is highly toxic to water hyacinth. The results of this study showed that the extract of lantana leaves suppressed the emergence of leaf buds of water hyacinth plant, and caused the decay of its leaves by foliar spraying. In addition, the increase of SOD activity in water hyacinth leaves was in accordance with the accumulation of H(2)O(2) and the increase in degree of membrane peroxidation, while the activity of catalase, which might remove the excessive H(2)O(2) in water hyacinth leaves, was inhibited by treatment with lantana extract. At tissue level, high H(2)O(2) histochemical labeling was detected in guard cells after treatment with lantana extract. This overproduction of H(2)O(2) could kill the leaf cells and cause leaf necrosis in the treated plant. Therefore, the high toxicity of lantana leaf extract to water hyacinth might be due to oxidative stress.
凤眼莲（Eichhornia crassipes）是世界上生长繁殖能力最强的植物之一，但同时也是一种令人头疼的杂草。为了保护公共供水系统免受化学除草剂污染，人们提出采用生物方法来控制这种杂草的生长和繁殖。马缨丹（Lantana camara L.）是马鞭草科的一种重要杂草，其叶提取物对凤眼莲具有高毒性。本研究结果表明，马缨丹叶提取物通过叶面喷施抑制了凤眼莲植株叶芽的萌发，并导致其叶片腐烂。此外，凤眼莲叶片中超氧化物歧化酶（SOD）活性的增加与过氧化氢（H₂O₂）的积累以及膜脂过氧化程度的增加相一致，而可能清除凤眼莲叶片中过量H₂O₂的过氧化氢酶活性则受到马缨丹提取物处理的抑制。在组织水平上，经马缨丹提取物处理后，保卫细胞中检测到高H₂O₂组织化学标记。这种过量产生的H₂O₂可杀死叶片细胞，导致处理后的植株叶片坏死。因此，马缨丹叶提取物对凤眼莲的高毒性可能是由于氧化应激所致。
