硅对镉胁迫下红树白骨壤酚类代谢的影响  

Silicon effects on phenols metabolism of Avicennia marina under cadmium stress

作　　者：张琼[1,2] 刘景春[2] 卢豪良[2] 段罕慧 严重玲 

机构地区：[1]闽南师范大学生物科学与技术学院,福建漳州363000 [2]厦门大学滨海湿地生态系统教育部重点实验室,福建厦门361102

出　　处：《生态学杂志》2015年第7期1892-1897,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31370516;31170471);闽南师范大学博士科研启动项目(2006L21432);闽南师范大学园林植物生长发育与生态配置校级创新团队项目资助

摘　　要：采用水培方式研究硅对重金属镉胁迫下白骨壤幼苗酚类代谢影响,探讨硅对白骨壤耐受重金属胁迫的影响,结果表明,低浓度镉胁迫(Cd 0.5 mg·L-1)下,随着外源硅的增加,叶片和根系丙二醛含量降低,但Si 50 mg·L-1处理中各器官总酚含量最高,硅对各器官单宁含量影响不显著;高浓度镉(Cd 5 mg·L-1)导致白骨壤叶片和根系膜脂过氧化,使得丙二醛含量显著高于对照,外源硅的添加显著降低了白骨壤叶片和根系丙二醛积累,Si 100mg·L-1显著增加了各器官中总酚含量和单宁含量,根系丙二醛含量与根系总酚含量呈显著负相关,叶片丙二醛含量与叶片单宁含量呈显著负相关,表明硅显著刺激高镉胁迫下白骨壤植物组织中酚类物质代谢,增加根系和叶片的抗氧化性,进而增加白骨壤对镉的耐受性。The effects of silicon on the phenols metabolism in Avicennia marina seedlings were studied under the stress of cadmium by adopting the hydroponic method, and the effects of silicon on the resistance of A. marina seedling to cadmium were further explored. The results showed that under the stress of cadmium of low concentration （ Cd 0.5 mg · L-1 ）, the content of malondialde- hyde in the leaves and roots decreased with the increase of the exogenous silicon level, and the total phenol content in each organ was the highest at Si 50 mg · L-1, while the effect of silicon on the tannin content in each organ was not significant. The high-concentration cadmium （Cd 5 mg · L-1 ） led to the membrane lipid peroxidation of the leaves and roots in A. marina, making the content of malondialdehyde significantly higher than that of the control; the addition of the exoge- nous silicon significantly reduced the accumulation of malondialdehyde in the leaves and roots of A. marina, and Si 100 mg ~ L-~ significantly increased the contents of total phenol and tannin in each organ. Significant negative correlations between the malondialdehyde content and total phe- nol content in roots and between the malondialdehyde content and tannin content in leaves were found, indicating that silicon significantly stimulated phenolic metabolism in A. marina organs under the stress of high-concentration cadmium, increased the oxidation resistance of the root sys- tem and leaves, and thus increased the tolerance of A. marina to cadmium.

关 键 词：重金属耐性 丙二醛 单宁 

分 类 号：X173[环境科学与工程—环境科学] X171.5