Improving soil selenium availability as a strategy to promote selenium uptake by high-Se rice cultivar

作者

Zhang, Mu; Xing, Guofang; Tang, Shuanhu; 更多内容

期刊:ENVIRONMENTAL AND EXPERIMENTAL BOTANY ISSN:0098-8472 , 年:2019 . 卷:163 页码:45-54

语种: English

原文链接:http://dx.doi.org/10.1016/j.envexpbot.2019.04.008

摘要

The aim of this research was to investigate the mechanism of selenium (Se) utilization by roots between two rice genotypes. The plant Se concentration, root organic acids secretion, soil Se fractions, soil pH, and infrared spectrum of soil were all determined through a root box experiment to clarify the differences in Se availability of rhizosphere soils between high-and low-Se rice cultivars. The results revealed that the grain Se concentration of the high-Se cultivar was significantly higher than that of the low-Se cultivar. The concentration of available Se, e.g. water-soluble and exchangeable, in the rhizosphere soil of the high-Se rice cultivar was dramatically higher than that of the low-Se rice cultivar, and the opposite result was observed in non-rhizosphere soil. The organic acids secretion of the high-Se rice cultivar showed a greater degree of reduction than that of the low-Se rice cultivar in response to the increase of Se application rates, while the infrared spectrum intensity of clay mineral in the rhizosphere of the high-Se rice cultivar exhibited a greater degree of increase than that of the low-Se rice cultivar. In addition, the pH of the rhizosphere soil of the high-Se rice cultivar was significantly higher than that of the low-Se rice cultivar at 0 mg kg(-1) Se treatment. The results demonstrated that the high-Se rice cultivar could obtain more Se than the low-Se rice cultivar by mass flow, which is limited by the concentration of mobile Se in soil; The high-Se rice cultivar had a greater ability to activate Se by increasing soil pH than the low-Se rice cultivar; The secretion of organic acids could activate Se by degrading clay minerals, while the high-Se rice cultivar may have a greater ability to regulate the secretion of organic acids. The present study suggests the high Se rice cultivar has stronger ability to increase Se availability of rhizosphere soil than the low-Se rice cultivar.

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关键词
Rice; Selenium; Availability; Rhizosphere; Organic acid

附加关键词:
MASS-FLOW; XYLEM TRANSPORT; DISSOLUTION; WHEAT; ACIDS; ACCUMULATION; DEFICIENCY; SPECIATION; DIFFUSION; KINETICS

作者信息

通讯作者:
     Tang, SH , Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Guangdong, Peoples R China.; Tang, SH , Minist Agr, Key Lab Plant Nutr & Fertiliser South Reg, Guangzhou 510640, Guangdong, Peoples R China.
作者机构:
     [1] [ Zhang, Mu; Tang, Shuanhu; Pang, Yuwan; Yi, Qiong; ︾ ] Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Guangdong, Peoples R China.
     [2] [ Zhang, Mu; Tang, Shuanhu; Pang, Yuwan; Yi, Qiong; ︾ ] Minist Agr, Key Lab Plant Nutr & Fertiliser South Reg, Guangzhou 510640, Guangdong, Peoples R China.
     [3] [ Xing, Guofang ] Shanxi Agr Univ, Coll Agron, Taigu 030801, Peoples R China.
作者邮箱:
     1006339502@qq.com