Nitric oxide alleviates selenium toxicity in rice by regulating antioxidation, selenium uptake, speciation and gene expression
文献类型： 外文期刊
作者： Dai, Zhihua 1 ; Rizwan, Muhammad 3 ; Gao, Fei 1 ; Yuan, Yuan 1 ; Huang, Hengliang 1 ; Hossain, Md Muzammel 1 ; Xiong, 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China
2.Guangxi Acad Agr Sci, Inst Agr Resources & Environm, Nanning 530007, Peoples R China
3.PMAS Arid Agr Univ, Inst Soil Sci, Rawalpindi 46000, Pakistan
4.Huazhong Agr Univ, Microelement Res Ctr, Wuhan 430070, Peoples R China
关键词： Nitric oxide; Rice; Gene expression; Selenium toxicity; Selenium speciation; Photosynthesis
期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）
ISSN： 0269-7491
年卷期： 2020 年 257 卷
页码：
收录情况： SCI
摘要： In plants, excess selenium (Se) causes toxicity, while the beneficial effects of nitric oxide (NO) have verified in plants under various abiotic conditions. In order to ensure safely Se-enriched rice production, the objective of the research was to clarify how exogenous NO alleviated high Se toxicity in rice. Under high Se (25 AM) stress, the effects of exogenous NO (by applying sodium nitroprusside, an exogenous NO donor) on growth parameters, Se content, Se speciation, photosynthesis, antioxidant system, expressions of Se transport and metabolism-related genes (phosphate transporter, OsPT2: S-adenosylmethionine synthase 1, OsSAMS1: cysteine synthase, OsCS; Se-binding protein gene, OsSBP1) in rice seedlings were investigated by a hydroponic experiment. The results showed that exogenous NO alleviated high Se-induced irreversible damage to root morphology, growth, photosynthesis, antioxidant capacity and decreased the contents of MDA, H2O2 and proline significantly in rice seedlings. Compared with high Se treatment, application of exogenous NO reduced root Se content (10%), and the Se(VI) decreased by 100% in root and shoot. Besides, exogenous NO decreased the accumulation of inorganic Se speciation in rice roots and shoots. Also, the qRT-PCR analysis showed that down-regulated gene expressions of OsPT2, OsSAMS1 and OsCS affected significantly via exogenous NO. So, the exogenous NO could effectively decrease the toxicity of high Se treatment in rice. (C) 2019 Elsevier Ltd. All rights reserved.
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