Accumulation and distribution of arsenic and cadmium in winter wheat (Triticum aestivum L.) at different developmental stages.
Accumulation and distribution of arsenic and cadmium in winter wheat (Triticum aestivum L.) at different developmental stages.
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冬小麦(Triticum aestivum L.)不同发育阶段砷和镉的积累和分配。
DOI：
10.1016/j.scitotenv.2019.02.394
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发表时间：
2019-06
影响因子：
9.8
通讯作者：
Qing Sheng Cai
中科院分区：
文献类型：
--
作者：
Gao Ling Shi;Dao Jun Li;Yu Feng Wang;Chang Hao Liu;Zhu Bing Hu;Lai Qing Lou;Zed Rengel;Qing Sheng Cai
已知砷（As）和镉（Cd）对人类有毒，并且在世界各地的粮食作物中都有浓度升高的记录。然而，在小麦植株发育过程中，对它们的吸收、转运和分布知之甚少。通过一系列试验研究了两个小麦品种(cv。JN12和JM85；后者在不同发育阶段是低粒镉积累器。从分蘖期到成熟期，As根浓度下降84%，Cd根浓度下降67%。相比之下，茎中的砷含量增加了3.1倍。成熟期根系As积累显著减少，伸长期根系Cd积累显著减少。随着植株生长的推进，各叶片中Cd和新叶中As的浓度均呈上升趋势。从灌浆到成熟期，老叶中砷的含量显著降低。在两个品种中，Cd处理的幼苗向上向幼嫩部分迁移的速度大于As处理。两个品种的茎和根对砷和镉的再活化存在差异。JM85的轴、颖片和籽粒中砷的含量显著高于JN12，而根和茎中砷的含量在不同品种间无显著差异。JN12的籽粒Cd含量显著高于JM85，但不同品种间茎叶和颖花Cd含量基本一致。两个品种籽粒Cd浓度的差异取决于根、茎Cd的再运输和从轴向颖花和籽粒的再分配；籽粒中砷的积累受叶片和茎向穗的再动员的影响。
Arsenic (As) and cadmium (Cd) are known to be toxic to humans, and elevated concentrations have been documented in food crops worldwide. However, little is known regarding their uptake, translocation, and distribution in wheat plants during plant development. A series of experiments were conducted to investigate the spatial distribution and dynamics of As and Cd in two wheat cultivars (cv. JN12 and JM85; the latter is a low grain Cd accumulator) at different developmental stages. Root concentrations of As decreased by 84%, and those of Cd by 67%, from tillering to maturity. In contrast, As concentrations in the stems increased 3.1-fold. A significant decrease in root As accumulation was observed at the mature stage, whereas root Cd accumulation decreased largely at the elongation stage. The concentrations of Cd in all leaves and As in new leaves increased as plant growth advanced. However, As concentrations in old leaves decreased significantly from grain filling to maturity. In both cultivars, the upward transfer toward younger parts of shoots was greater in the case of Cd than of As. The remobilization of As and Cd from stems and roots differed between the two cultivars. Arsenic concentrations in rachis, glumes, and grain in JM85 were significantly higher than those in JN12, whereas As concentrations in roots and stems did not differ between the cultivars. Grain Cd was significantly higher in JN12 than in JM85, but Cd concentrations in rachis and glumes were similar between the cultivars. The difference in grain Cd concentration between the two cultivars depended on root and stem Cd remobilization and redistribution from rachis to glumes and grain; in contrast, accumulation of As in grain was influenced by As remobilization from the leaves and stem to the spike.
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DOI：
10.1146/annurev-earth-060313-054942
发表时间：
2014-05-01
影响因子：
14.9
作者：
Zhu YG;Yoshinaga M;Zhao FJ;Rosen BP
通讯作者：
Rosen BP
影响因子：
9.8
作者：
Kumar, Manoj;Ramanathan, A. L.;Naidu, Ravi
通讯作者：
Naidu, Ravi
影响因子：
13.6
作者：
G. Shi;Shun Zhu;Sheng Nan Bai;Yan Xia;L. Lou;Q. Cai
通讯作者：
G. Shi;Shun Zhu;Sheng Nan Bai;Yan Xia;L. Lou;Q. Cai
影响因子：
8.8
作者：
Yuqiang Tao;Shuzhen Zhang;Wei Jian;Chungang Yuan;X. Shan
通讯作者：
Yuqiang Tao;Shuzhen Zhang;Wei Jian;Chungang Yuan;X. Shan
影响因子：
6.8
作者：
Dziubanek, Grzegorz;Piekut, Agata;Hajok, Ilona
通讯作者：
Hajok, Ilona