农业环境科学学报Issue(12)：2296-2302,7.DOI:10.11654/jaes.2014.12.003
环境相关浓度MC-LR作用对营养生长期水稻生长和抗氧化酶活性的影响
Effects of Microcystin-LR at Environmental Relevant Concentrations on Growth and Antioxidant Enzymes of Oryza sativa L. at Vegetative Stage
摘要
Abstract
In recent years, the worldwide occurrence of cyanobacterial blooms is of great ecological concern because many genera of bloom-forming cyanobaceria are known to produce microcystins. Toxic effects of microcystin-LR(MC-LR)on mammals, birds, and aquatic organ-isms have been widely investigated, but its phytotoxic effects and mechanisms in terrestrial plants remain unclear. In the present study, we examined the growth and development and enzyme activities, including plant height, root length, aboveground biomass, photosynthesizer, and root peroxidase(POD), glutathione(GSH), protein phosphatase(PP)and malondialdehyde(MDA)in rice plants(Oryza sativa L.)ex-posed to 0, 0.1, 1, 10, 50μg·L-1 of MC-LR for 7, 15, 20, and 34 days. Results showed that the root length of rice increased by 6.94%and 6.06%under the exposure of 0.1 and 1μg·L-1 MC-LR, respectively, but reduced significantly by 8.71%under the exposure of 50μg·L-1 MC-LR, compared with the control over the 34 days of the experiment. MC-LR significantly induced the activities of some key indicators in the antioxidant system of rice, such as POD and GSH. The longer exposure time, the more remarkable induction was observed. However, POD was significantly inhibited by 58.51%and 8.09%by 0.1μg·L-1 MC-LR in 20 and 34 days of the experiment, respectively. Applying 50μg·L-1 MC-LR significantly inhibited POD, GSH, and PP by 38.52%, 45.86%, and 52.51%, respectively, after 34 days of the exposure. These results show that MC-LR has toxic effects on terrestrial plants under long time exposure to environmental relevant concentrations.关键词
MC-LR/水稻/生长/光合作用/酶活性Key words
microcystin-LR/rice/growth/photosynthesis/enzymatic/activity分类
资源环境引用本文复制引用
张敏敏,姜锦林,周军英,单正军,卜元卿,续卫利..环境相关浓度MC-LR作用对营养生长期水稻生长和抗氧化酶活性的影响[J].农业环境科学学报,2014,(12):2296-2302,7.基金项目
国家自然科学基金专项基金（31340017）；国家自然科学基金青年基金 （）
