Performance of common buckwheat(Fagopyrum esculentum M.) supplied with selenite or selenate for selenium biofortification in northeastern China  

作　　者：Ying Jiang Xiaomin Feng Yadong Yang Xiangxue Qi Yongfeng Ren Youhui Gao Weidong Liu Yuegao Hu Zhaohai Zeng 

机构地区：[1]College of Agronomy and Biotechnology, China Agricultural University [2]Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture

出　　处：《The Crop Journal》2018年第4期386-393,共8页作物学报（英文版）

基　　金：provided by the China Agriculture Research System(CARS-08-B-1);by Special Fund for Agro-scientific Research in the Public Interest(201503121-11);the China Scholarship Council for providing a graduate research fellowship to Y.Jiang as a joint Ph.D.student at Colorado State University for one year(201606350049)

摘　　要：Selenium(Se)deficiency commonly occurs in soils of northeastern China and leads to insufficient Se intake by humans.A two-year field study of Se biofortification of common buckwheat supplied with 40 g Se ha^(-1)as selenite(Se(IV)),selenate(Se(VI)),or a combination(1/2 Se(IV+VI))was performed to investigate Se accumulation and translocation in plants and determine the effects of different forms of Se on the grain yield,biomass production,and Se use efficiency of plants and seeds.Se application increased seed Se concentrations to 47.1–265.1μg kg^(-1).Seed Se concentrations following Se(VI)or 1/2 Se(IV+VI)treatment exceeded 100μg kg^(-1),an amount suitable for crop Se biofortification.Se concentration in shoots and roots decreased with plant development,and Se translocation from root to shoot in Se(IV)-treated plants was lower than that in plants treated with 1/2 Se(IV+VI)and Se(VI).Both grain yield and biomass production increased under 1/2 Se(IV+VI)treatment,with grain yields reaching 1663.8 and 1558.5 kg ha^(-1)in 2015 and 2016,respectively,reflecting increases of 11.0% and 10.3% over those without Se application.The Se use efficiency of seeds and plants under Se(VI)treatment was significantly higher than those under 1/2 Se(IV+VI)and Se(IV)treatments.Thus,application of selenate could result in higher Se accumulation in buckwheat seeds than application of the other Se sources,but the combined application of selenate and selenite might be an alternative approach for improving buckwheat grain yield by Se biofortification in northeastern China.Selenium （Se） deficiency commonly occurs in soils of northeastern China and leads to insufficient Se intake by humans. A two-year field study of Se biofortification of common buckwheat supplied with 40 g Se ha？1 as selenite （Se（IV））, selenate （Se（VI））, or a combination （1/2 Se（IV ＋ VI）） was performed to investigate Se accumulation and translocation in plants and determine the effects of different forms of Se on the grain yield, biomass production, and Se use efficiency of plants and seeds. Se application increased seed Se concentrations to 47.1–265.1 μg kg？1. Seed Se concentrations following Se（VI） or 1/2 Se（IV ＋ VI） treatment exceeded 100 μg kg？1, an amount suitable for crop Se biofortification. Se concentration in shoots and roots decreased with plant development, and Se translocation from root to shoot in Se（IV）-treated plants was lower than that in plants treated with 1/2 Se（IV ＋ VI） and Se（VI）. Both grain yield and biomass production increased under 1/2 Se（IV ＋ VI） treatment, with grain yields reaching 1663.8 and 1558.5 kg ha？1 in 2015 and 2016, respectively, reflecting increases of 11.0% and 10.3% over those without Se application. The Se use efficiency of seeds and plants under Se（VI） treatment was significantly higher than those under 1/2 Se（IV ＋ VI） and Se（IV） treatments. Thus, application of selenate could result in higher Se accumulation in buckwheat seeds than application of the other Se sources, but the combined application of selenate and selenite might be an alternative approach for improving buckwheat grain yield by Se biofortification in northeastern China.

关 键 词：Common buckwheat Se uptake Se accumulation Se translocation Se biofortification 

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