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Effects of Cd uptake, translocation and redistribution in different hybrid rice varieties on grain Cd concentration

文献类型： 外文期刊

作者： Luo, Qiuhong 1 ; Bai, Bin 2 ; Xie, Yunhe 3 ; Yao, Dongping 2 ; Zhang, Dongmeng 1 ; Chen, Zhe 2 ; Zhuang, Wen 2 ; Deng, Qiyun 2 ; Xiao, Yinghui 1 ; Wu, Jun 2 ;

作者机构： 1.Hunan Agr Univ, Coll Agron, Changsha 410128, Hunan, Peoples R China

2.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Hunan, Peoples R China

3.Hunan Acad Agr Sci, Hunan Inst Agroenvironm & Ecol, Changsha 410125, Hunan, Peoples R China

4.BioRice Hunan Co Ltd, Changsha 410323, Hunan, Peoples R China

关键词： Cadmium; Hybrid rice; Phloem; Transport; Uptake

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：7.129； 五年影响因子：7.284 ）

ISSN： 0147-6513

年卷期： 2022 年 240 卷

页码：

收录情况： SCI

摘要： In order to identify the key transport process that determines the Cd concentration in brown rice, this study used 21 hybrid rice varieties as experimental materials and conducted field experiments in Qiyang (cadmiumcontaminated site) and Yongding (low-cadmium site). Cd concentrations in 8 organs were measured, and bio-concentration factors and transfer factor were further calculated. The results showed that the Cd concentrations of the organs related to the xylem transport were as follows: root > node > stem > leaf sheath > leaf. In the phloem, the Cd concentrations were as follows: rachis > brown rice > rice husk. And the results of the correlation analysis found that Cd concentration between brown rice and root showed a significant positive correlation in Cd-contaminated site, but no significant correlation in low-cadmium site. Meanwhile, at both experimental sites, the Cd concentration of brown rice showed the most significant correlation with the phloem transfer factor from leaf and leaf sheath to brown rice. Principal Component Analysis (PCA) and stepwise regression analysis likewise found that Cd concentration in leaf and leaf sheath and their phloem transport of Cd to brown rice were significantly and positively correlated with Cd concentration in brown rice. The above results showed that the transport of leaf and leaf sheath to brown rice was a key process, and played a more important role in the accumulation of cadmium in brown rice than in root.

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