农业环境科学学报2016，Vol.35Issue(11)：2086-2093,8.DOI:10.11654/jaes.2016-0929
镉胁迫下苦楝（Melia azedarach L.）幼苗的生长及生理响应
The growth and physiological responses of Melia azedarach L. seedlings to cadmium stress
摘要
Abstract
Melia azedarach L. is a garden tree that can grow in poor soil, and has high ornamental and medicinal value. In this study, the ef-fects of cadmium(Cd)on growth, cadmium accumulation, photosynthetic characteristic, membrane permeability as well as osmotic adjust-ment in Melia azedarach L. seedlings were investigated in a pot experiment. Results showed that the biomass accumulation was enhanced when≤60 mg·kg-1 Cd treatments, whereas>60 mg·kg-1 Cd2+inhibited plant growth and biomass accumulation, however,≤120 mg·kg-1 Cd treatments had no significant differences on plant height compared with CK(P>0.05), plants could grow normally and keep large biomass. Melia azedarach L. showed capacity in Cd accumulation, and the Cd content in roots,stems and leaves increased when Cd content increased in soil, and root was the main accumulation area. With increased Cd concentration, Chlorophyll a+b content and net photosynthetic rate were reduced but relative conductivity(REC)and malondialdehyde(MDA)content were increased, however, no significant difference with Cd treatments(≤60 mg·kg-1)was found. Cd stress caused the content of soluble sugar decreased, the contents of soluble protein and free pro-line were increased at first then decreased when Cd concentration increased, free proline content was always higher than CK. By increasing soluble protein and free proline contents Melia azedarach L. maintained the osmotic balance under Cd stress, thus alleviated Cd toxicity. These results suggests that Melia azedarach L. has strong tolerance for Cd2+, the threshold concentration is about 120 mg·kg-1.Therefore Melia azedarach L. can be used in Cd contaminated soil, which remediate Cd contaminated soil.关键词
苦楝/镉积累/生物量/光合特性/渗透调节物质Key words
Melia azedarach L./cadmium accumulation/biomass/photosynthetic characteristic/osmotic-regulating substance分类
资源环境引用本文复制引用
苏明洁,廖源林,叶充,蔡仕珍,龙聪颖,邓辉茗..镉胁迫下苦楝（Melia azedarach L.）幼苗的生长及生理响应[J].农业环境科学学报,2016,35(11):2086-2093,8.基金项目
四川省教育厅重点项目（12ZA116）；四川农业大学大学生创新性实验计划项目 （）
