Sulfur supply reduces cadmium uptake and translocation in rice grains (Oryza sativa L.) by enhancing iron plaque formation, cadmium chelation and vacuolar sequestration
Sulfur supply reduces cadmium uptake and translocation in rice grains (Oryza sativa L.) by enhancing iron plaque formation, cadmium chelation and vacuolar sequestration
复制标题
硫供应通过增强铁斑形成、镉螯合和液泡隔离来减少稻粒 (Oryza sativa L.) 中镉的吸收和易位
DOI：
10.1016/j.envpol.2018.02.083
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发表时间：
2018-07-01
影响因子：
8.9
通讯作者：
Chen, Ming-Xue
中科院分区：
文献类型：
--
作者：
Cao, Zhen-Zhen;Qin, Mei-Ling;Chen, Ming-Xue
水稻 (Oryza sativa L.) 中硫 (S) 肥的施用对于决定水稻产量和品质至关重要。然而，关于硫供应对水稻中镉 (Cd) 吸收和转运的影响的信息很少。本研究通过水培和土壤实验，研究了两种Cd水平（0和50 μM）以及三种S浓度（0、2.64和5.28 mM）下S供应对水稻Cd积累的影响。适量和过量的硫供应（2.64和5.28 mM）往往会增加植物生长、根长、水稻幼苗的根和地上部干重，并且在缺乏或存在镉的情况下显着降低水稻植株和籽粒中的镉浓度。根和地上部镉的亚细胞分布和化学形态也随着硫供应水平的变化而变化。水稻籽粒中 Cd 吸收和转运的减少可归因于根部表面铁 (Fe) 斑块形成的增强以及根部 Cd 螯合和液泡封存的增加，因为铁斑块中 Fe、Mn 浓度、谷胱甘肽和植物螯合素含量以及根部植物螯合素合成酶 (OsPCS) 和液泡膜重金属 ATP 酶 (OsHMA3) 表达随着硫供应的增加而显着增加。这项工作为水稻吸收和转运镉的机制提供了更多的见解，并将有助于制定通过在镉污染土壤中施用硫肥来减少水稻籽粒镉的策略。 (C) 2018 Elsevier Ltd. 保留所有权利。
Sulfur (S) fertilizer application in rice (Oryza sativa L.) is crucial in determining rice grain productivity and quality. However, little information is available concerning the effect of S supply on cadmium (Cd) uptake and translocation in rice. In this study, both hydroponic and soil experiments were conducted to investigate the influence of S supply on Cd accumulation in rice under two Cd levels (0 and 50 mu M), combined with three S concentrations (0, 2.64 and 5.28 mM). The moderate and excessive S supply (2.64 and 5.28 mM) tended to increase plant growth, root length, root and shoot dry weights of rice seedlings, and significantly decreased Cd concentrations in rice plants and grains in the absence or presence of Cd. The subcellular distribution and chemical forms of Cd in roots and shoots also varied with S supply levels. The decreased Cd uptake and translocation in rice grains could be ascribed to the enhanced formation of iron (Fe) plaque on the root surfaces and increased Cd chelation and vacuolar sequestration in roots, since Fe, Mn concentrations in Fe plaque, glutathione and phytochelatins contents, as well as phytochelatin synthase (OsPCS) and tonoplast heavy metal ATPase (OsHMA3) expressions in roots significantly increased with increased S supply. This work provides more insight into the mechanisms of Cd uptake and translocation in rice, and will be helpful for developing strategies to reduce rice grain Cd through S fertilizer application in Cd-contaminated soil. (C) 2018 Elsevier Ltd. All rights reserved.