卷心菜叶抵御铬毒害的硒诱导保护机制研究
Excessive chromium (Cr) causes oxidative stress to plants, and the positive effect of selenium(Se) become evident especially in plants subjected to intemal and extemal oxidative stressors. Theimpacts of exogenous Se on Cr-induced oxidative stress and antioxidant system in leaves of Brassicacampestris L. ssp. Pekinensis were investigated by using cellular and biochemical approcaches.Supplementation of the medium witb lower Se level resulted in alleviated growth inhibition and alteredthe distribution of Cr in subcellular of the leaves. Cr-induced lipid peroxidation and superoxide freeradicals (02”) overproduction, as well as ultrastructal changes of leaves were largely reversed by Sesupplementation in the medium. Se application significantly altered the Cr effects on anitioxidantenzymes, and significantly increased the activities of superoxide dismutase (SOD) and peroxidase (CAT).The results suggested that Se is able to protect the Brassica campestris L. ssp. Pekinensis against Crtoxicity by: (1) activate the antioxidant enzymes SOD and POD; (2) reduction of oxygen radicals; (3)removal of Cr from metabolically active cellular sites.
卷心菜 铬毒害 硒元素 诱导保护机制
Xiaohu Zhao Mu Zhang Qiling Tan Xuecheng Sun Xuejiao Qing Chengxiao Hu Peng Wang Xuan Zhang Ying Zhang Hanzhi Shi Pengcheng Wang Ruochong Liu
Micro-element Research Center,Huazhong Agricultural University,Wuhan 430070,China
国内会议
广州
中文
94-111
2012-11-01（万方平台首次上网日期，不代表论文的发表时间）