Quick selenium accumulation in the selenium-rich rice and its physiological responses in changing selenium environments
Quick selenium accumulation in the selenium-rich rice and its physiological responses in changing selenium environments
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富硒水稻快速富硒及其在硒环境变化下的生理反应
DOI：
10.1186/s12870-019-2163-6
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发表时间：
2019-12-17
影响因子：
5.3
通讯作者：
Zhu, Jianqing
中科院分区：
文献类型：
--
作者：
Liang, Yuanke;Su, Yang;Zhu, Jianqing
硒元素缺乏被认为是一个全球性的人类健康问题，可以通过每日从富含硒的食物中补充硒来消除。增加水稻籽粒硒的积累是满足这些营养需求的途径。尽管如此，硒被证明是必需的，但对植物也是有毒的，在缺乏和毒性之间的差距很小。值得注意的是，富硒水稻硒积累和硒耐受的调控机制尚不清楚。结果本研究研究了富硒水稻在不同硒处理下的表型、生理和生化变化。结果表明，富硒水稻在低硒环境下从根部积累的硒丰度高于无硒水稻。硒过量对富硒水稻植株的毒害作用主要表现在诱导植株萎黄、矮化、降低抗氧化剂含量、加重氧化胁迫等方面。此外，磷酸盐转运体osp2和硫酸盐转运体sossultr1；2可能有助于水稻吸收硒酸盐。结论富硒红米对硒的外源施用更为敏感，而富硒红米根系硒的施用在20 μM时达到最有效。本研究结果为评价富硒水稻在硒污染田中毒性效应提供了一种直接的方法。最后，建议将一些长期的实地试验战略纳入各种实地管理的风险和效益评价中。
BackgroundThe element selenium (Se) deficiency is thought to be a global human health problem, which could disperse by daily-supplement from Se-rich food. Increasing the accumulation of Se in rice grain is an approach matched to these nutrient demands. Nonetheless, Se is shown to be essential but also toxic to plants, with a narrow margin between deficiency and toxicity. Notably, the regulatory mechanism balancing the accumulation and tolerance of Se in Se-rich rice plants remains unknown.ResultsIn this study, we investigated the phenotypical, physiological, and biochemical alterations of Se-rich rice in the exposure to a variety of Se applications. Results showed that the Se-rich rice was able to accumulate more abundance of Se from the root under a low Se environment comparing to the Se-free rice. Besides, excessive Se led to phytotoxic effects on Se-rich rice plants by inducing chlorosis and dwarfness, decreasing the contents of antioxidant, and exacerbating oxidative stresses. Furthermore, both phosphate transporterOsPT2and sulfate transportersOsSultr1;2may contribute to the uptake of selenate in rice.ConclusionsSe-rich red rice is more sensitive to exogenous application of Se, while and the most effective application of Se in roots of Se-rich rice was reached in 20 μM. Our findings present a direct way to evaluate the toxic effects of Se-rich rice in the Se contaminated field. Conclusively, some long-term field trial strategies are suggested to be included in the evaluation of risks and benefits within various field managements.