摘 要:目前,硒元素营养失衡已严重影响人类健康,中国约7亿人口生活在低硒地区,而小麦作为人们的主要食物,其籽粒中硒元素含量普遍较低。通过土壤施用和叶面喷施硒肥等途径来增加小麦籽粒内部硒元素累积量,进而改善人体硒营养水平被认为是经济有效的手段,这也引起了国内外学者的广泛关注。本文概述了小麦对硒的吸收、转运和分布特点,提高小麦籽粒硒含量的途径、影响因素,富硒小麦的加工工艺及产业发展中存在的问题,并对今后富硒小麦产业的研发做出了展望。
关键词:小麦;籽粒;硒;生物强化
中图分类号:S512.1 文献标识号:A 文章编号:1001-4942(2015)06-0137-08
Research Progress of Se-Eiched Wheat
Yu Limin1, Xue Yanfang2, Gao Huaxin1, Chen Lu3, Zhang Bingchun3, Xia Haiyong1*
(1.Crop Research Institute/Key Laboratory of Wheat Biology and Genetic Breeding in North Huanghuai Plain of Ministry of
Agriculture/National Engineering Laboratory of Wheat and Maize, Shandong Academy of Agricultural Sciences, Jinan 250100, China;
2.Maize Research Institute/National Engineering Laboratory of Wheat and Maize, Shandong Academy of Agricultural Sciences, Jinan 250100, China;
3.Agricultural Quality Standards and Testing Technology Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100,China)
Abstract At present, human health has been seriously affected by the unbalance of selenium (Se) nutrient. About 700 million people live in low Se areas in China. Wheat (Triticum aestivum L.) as the staple food of people, its grain Se content is generally low. Through increasing the soil effective selenium and/or by foliar application of selenium fertilizer, the grain Se content can be dramatically enhanced. These ways have been considered to be economic and effective means to improve human Se nutritional level and have caused the wide attention of scholars at home and abroad. The characteristics of the absorption, transportion and distribution of Se in wheat, the ways and possible influencing factors to improve wheat grain Se content, the Se-eiched wheat processing technology and the problems and prospects in the development of Se-eiched wheat industry were summarized in this paper.
Key words Wheat; Grain; Selenium; Biofortification
硒(Se)在环境中的生物地球化学循环影响人体健康。有研究表明,在岩石、土壤、水源等环境中硒元素含量比较缺乏和生物有效利用率较低的地区,人体硒摄入量不足,会激发人类微小病毒B19(HPVB19)的毒性,引发大骨节病[1]。目前的基本共识是,硒在预防艾滋病、增强抗癌能力和提高人体免疫功能等方面有显著作用,常被称作“生命的火种”。
据报道,我国正处于全球的缺硒地带,包含22个省份和72%的国土面积在内,总计大约7亿人口生活在硒元素缺乏地区[2];营养调查结果表明,我国成人每天硒的摄入量为26.6 μg,远低于中国营养学会推荐的每天50 μg以上的标准硒摄入水平[3],所以我们每个人基本都需要补硒。
小麦作为主要的粮食作物,可将土壤中的无机硒吸收并转化为人体可利用率较高的有机硒,因此,增加小麦籽粒特别是面粉中的硒含量是人体补硒的有效策略之一。本文概述了小麦对硒的吸收、转运和分布特点,提高小麦籽粒硒含量的途径、影响因素,富硒小麦的加工工艺及产业发展中存在的问题,并对以后富硒小麦产业研发做出了展望,旨在为我国小麦富硒的研究和产业发展提供参考。
1 小麦对硒的吸收累积规律