Nitric oxide alleviates selenium toxicity in rice by regulating antioxidation, selenium uptake, speciation and gene expression

被引：29

作者：

Dai, Zhihua ^{[1
,4
]}

Rizwan, Muhammad ^{[3
]}

Gao, Fei ^{[1
]}

Yuan, Yuan ^{[1
]}

Huang, Hengliang ^{[1
]}

Hossain, Md Muzammel ^{[1
]}

Xiong, Shuanglian ^{[1
]}

Cao, Menghua ^{[1
]}

Liu, Yongxian ^{[2
]}

Tu, Shuxin ^{[1
,4
]}

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

来源：

ENVIRONMENTAL POLLUTION | 2020年 / 257卷

关键词：

Nitric oxide; Rice; Gene expression; Selenium toxicity; Selenium speciation; Photosynthesis; ABSCISIC-ACID; SUPEROXIDE-DISMUTASE; S-NITROSYLATION; HUMAN HEALTH; STRESS; TOLERANCE; OXYGEN; GROWTH; ACCUMULATION; SELENATE;

D O I：

10.1016/j.envpol.2019.113540

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

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.

引用

页数：8

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