期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 128, 期 -, 页码 206-212出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2016.02.021
关键词
Glutathione; Iron plaque; Lead; Rice (Oryza saliva L.); Sulfur
资金
- 973 Program [2014CB238906]
- One Hundred Talents Program of the Chinese Academy of Sciences
- 863 Program [2013AA06A211-2]
- Beijing Municipal Science and Technology Project [Z131100003113008]
- Science and Technology Service Network Initiative [KFJ-EW-STS-014]
- National Natural Science Foundation of China (NSFC) [41201312, 41271479, 41271478, 41250110528]
Human activities have resulted in lead and sulfur accumulation in paddy soils in parts of southern China. A combined soil sand pot experiment was conducted to investigate the influence of S supply on iron plaque formation and Pb accumulation in rice (Oryza saliva L.) under two Pb levels (0 and 600 mg kg(-1)), combined with four S concentrations (0, 30, 60, and 120 mg kg(-1)). Results showed that S supply significantly decreased Pb accumulation in straw and grains of rice. This result may be attributed to the enhancement of Fe plaque formation, decrease of Pb availability in soil, and increase of reduced glutathione (GSH) in rice leaves. Moderate S supply (30 mg kg(-1)) significantly increased Fe plaque formation on the root surface and in the rhizosphere, whereas excessive S supply (60 and 120 mg kg(-1)) significantly decreased the amounts of iron plaque on the root surface. Sulfur supply significantly enhanced the GSH contents in leaves of rice plants under Pb treatment. With excessive S application, the rice root acted as a more effective barrier to Pb accumulation compared with iron plaque. Excessive S supply may result in a higher monosulfide toxicity and decreased iron plaque formation on the root surface during flooded conditions. However, excessive S supply could effectively decrease Pb availability in soils and reduce Pb accumulation in rice plants. (C) 2016 Elsevier Inc. All rights reserved.
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