文献类型： 外文期刊

作者： Huang, Qi-na ¹ ; An, Hua ² ; Yang, Yong-jie ¹ ; Liang, Yan ¹ ; Shao, Guo-sheng ¹ ;

作者机构： 1.China Natl Rice Res Inst, Hangzhou 31006, Zhejiang, Peoples R China

2.Yunnan Acad Agr Sci, Inst Food Crops, Kunming 650205, Peoples R China

关键词： Heavy metal;Cadmium;Manganese;Antagonism;Rice (Oryza sativa L.);EDTA;Na2Mn

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

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收录情况： SCI

摘要： The antagonistic interaction between Mn (Manganese) and Cd (Cadmium) was studied in Milyang 46 and Zhenshan 97B rice varieties in relation to Cd tolerance and accumulation in hydroponics. Additionally, a new method controlling Cd uptake and accumulation was established with Jinzao 47 and Zhongjiazao 32 rice varieties with similar growth periods in a soil culture system by application of different forms of Mn. (1) In hydroponics, the results showed that MnSO4 (9.1 and 91 A mu M) and EDTA center dot Na2Mn (9.1 A mu M) significantly alleviated Cd toxicity at high levels of Cd (1.0 and 5.0 A mu M), and Cd accumulation in roots and root plates were significantly reduced in contrast to shoots, but 91 A mu M EDTA center dot Na2Mn posed serious Mn toxicity in both rice genotypes, and increasing Cd levels could reduce Mn accumulation. (2) In a soil culture system, for rice shoots, roots and grains, soil application of MnSO4 significantly increased Cd accumulation, but EDTA center dot Na2Mn greatly decreased Cd accumulation and ameliorated Cd-induced pre-senescence. Furthermore, foliar application of MnSO4 or EDTA center dot Na2Mn reduced Cd accumulation in grains but increased Cd accumulation in shoots at the mature stage. Our data suggest there is significant interaction between Mn and Cd in relation to the forms of Mn. Alleviation of MnSO4 on Cd toxicity, and Cd accumulation in plants occurred only under Mn deficiency. Additionally, EDTA center dot Na2Mn is a chelated Mn complex, relatively more stable than MnSO4, and could maintain a high level of Mn2+ for a longer period in solution; therefore, EDTA center dot Na2Mn instead of MnSO4 could be a practical way to control Cd accumulation in rice.