期刊
PLANT AND SOIL
卷 326, 期 1-2, 页码 321-330出版社
SPRINGER
DOI: 10.1007/s11104-009-0011-4
关键词
Nitric oxide; IAA oxidase; Proline; Glutathione; Heavy metal tolerance; Medicago truncatula
资金
- Chinese Academy of Sciences [0707013603]
The effects of nitric oxide (NO) on cadmium toxicity in Medicago truncatula seedlings were studied by investigating root growth and uptake of antioxidants, IAA and ions. Exposure to cadmium reduced root growth and NO accumulation, and increased the production of reactive oxygen species (ROS) in roots. Supplementation with NO improved root growth and reduced ROS accumulation in roots. The NO-scavenger cPTIO, the nitrate reductase (NR) inhibitor tungstate, and the NO synthase (NOS) inhibitor L-NAME all inhibited the accumulation of NO in roots and reversed the effects of NO in promoting the root growth and accumulation of proline and glutathione. Application of NO reduced auxin degradation by inhibiting the activity of IAA oxidase. Exogenous NO also enhanced the uptake of K+ and Ca2+. These results suggest that NO improves cadmium tolerance in plants by reducing oxidative damage, maintaining the auxin equilibrium and enhancing ion absorption.
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