期刊
ASIAN JOURNAL OF CHEMISTRY
卷 25, 期 6, 页码 2970-2976出版社
ASIAN JOURNAL OF CHEMISTRY
DOI: 10.14233/ajchem.2013.13460
关键词
Antioxidative metabolism; Maize (Zea mays L.); Cadmium; Glutathione; Microelement; Selenium; Stress mitigation
资金
- National Natural Science Foundation of China [30571097]
- Key Research Foundation of Zhejiang Bureau of Science and Technology [2009C12050]
A hydroponic experiment was carried out to study the modulation of exogenous reduced glutathione and selenium in antioxidant defense system and microelement uptake against cadmium-toxicity in maize seedlings. The results showed that 50 M cadmium increased accumulation of H2O2 and malondialdehyde but reduced plant height, root length, chlorophyll content (SPAD value) and biomass. Antioxidant enzyme activities of root/leaf peroxidase and leaf superoxide dismutase increased significantly under cadmium stress, while leaf catalase decreased significantly. Moreover, cadmium-stress reduced manganese concentrations both in shoots and roots. Significantly negative correlation was discovered between manganese and cadmium concentration in different plant organs. Addition of 2.5 mu M selenium or pretreated with 100 mu M glutathione for 24 h significantly alleviated cadmium-induced growth inhibition and dramatically diminished leaf H2O2 and root malondialdehyde accumulation. Se addition or glutathione pretreatment significantly decreased cadmium concentration in roots/shoots, increased root iron level, while glutathione reduced zinc uptake. Furthermore, GSH/Se counteracted cadmium-induced alterations of certain antioxidant enzymes, e.g. brought root/leaf peroxidase and leaf superoxide dismutase activities down towards to the control level, but elevated root ascorbate peroxidase activity. These data suggest that reduced cadmium concentration and diminished cadmium-induced H2O2 and malondialdehyde accumulation in plants could be principal protective mechanism for the exogenous glutathione/selenium against cadmium toxicity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据