Selenium reduces cadmium accumulation in seed by increasing cadmium retention in root of oilseed rape (Brassica napus L.)
Selenium reduces cadmium accumulation in seed by increasing cadmium retention in root of oilseed rape (Brassica napus L.)
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硒通过增加油菜根部镉的保留来减少种子中镉的积累（Brassica napus L.）
DOI：
10.1016/j.envexpbot.2018.11.017
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发表时间：
2019-02
影响因子：
5.7
通讯作者：
Zhao Xiaohu
中科院分区：
文献类型：
--
作者：
Zhao Yuanyuan;He Chengxiao;Wu Zhichao;Liu Xinwei;Cai Miaomiao;Jia Wei;Zhao Xiaohu
镉（Cd）在农作物可食部分的积累威胁着人类的健康。硒在促进植物生长和减少镉积累方面的有益作用已被证实。研究了硒对油菜种子中镉含量的影响，并揭示了硒在油菜根中的调控机制。结果表明，在Cd污染土壤中，外源硒的施用显著降低了植物种子中Cd的含量。在5 μmol L−1Cd胁迫下，硒处理提高了叶片光合作用和光合色素含量，降低了根中Cd浓度，但根形态与单独Cd处理相比变化不大。对根系的进一步研究表明，硒的加入增加了镉的浓度与非活性形式。除此之外，硒还增加了果胶和半纤维素2的含量，这与根细胞壁中镉浓度的增加是一致的。本研究结果表明，施硒后，根系中移动的Cd络合物的比例增加，根系细胞壁对Cd的结合量沿着增加，果胶和半纤维素2的含量增加，从而减少了根系对Cd的吸收，并减少了Cd向茎、荚和种子的运输。
Cadmium (Cd) accumulation in edible part of crop threatens human health. The beneficial effects of selenium (Se) have been established in improving plant growth and reducing Cd accumulation in plant under Cd stress. This study investigated the effect of Se in reducing Cd concentration in seed, and revealed the underlying regulating mechanisms in root of rape. Results showed that when plants were grown in Cd contaminated soil, the application of exogenous Se significantly reduced Cd concentration in seed. Under 5 μmol L−1Cd stress, the photosynthesis and photosynthetic pigment contents in leaf tissue were improved with the addition of Se; Se reduced Cd concentration in root, while root morphology showed little variation by comparison with Cd treated alone. Further studies on root revealed that Se addition increased the concentration of Cd with inactive forms. Except that, Se increased the contents of pectin and hemicellulose 2, which was consistent with the elevated Cd concentration in root cell walls. Findings in this study may indicate that with the application of Se, the proportion of less mobile Cd-complex is enhanced, and the Cd binding to root cell wall increases along with the elevated contents of pectin and hemicellulose 2; all of these contribute to the reduction of Cd uptake in root and therefore transportation to stem, pod, and finally seed.
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通讯作者：
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