摘要
为研究叶面喷施氨基酸螯合硒对水稻籽粒硒含量及形态的影响,以水稻品种百香139为材料,通过大田试验,在水稻破口期叶面喷施不同用量的氨基酸螯合硒,并在水稻拔节孕穗期、始穗期、扬花授粉期、灌浆期、蜡熟期5个不同生育期叶面喷施13.5 g/hm^(2)(以硒计)的氨基酸螯合硒,在水稻成熟期测定、分析各处理组水稻地上部不同组织器官硒含量和籽粒硒形态。结果表明,喷施外源氨基酸螯合硒可提高水稻各器官硒含量,在适量范围内水稻植株各器官硒含量随着喷硒浓度的增加而提高;水稻籽粒中硒主要以硒代蛋氨酸存在,水稻籽粒中硒代蛋氨酸含量与总硒含量的变化规律相一致。喷施氨基酸螯合硒用量为6.75、13.5、27.0 g/hm^(2)时水稻籽粒中硒含量分别为0.168、0.431、0.439 mg/kg,均达到《富硒农产品硒含量分类要求》(DB45/T 1061-2014)的要求。拔节孕穗期至灌浆期喷硒处理水稻籽粒硒含量呈现增高趋势,灌浆期喷硒处理的水稻籽粒总硒含量最高,达到0.320 mg/kg;水稻籽粒中硒代蛋氨酸含量占总硒含量的比例为43%~91%,硒代蛋氨酸含量占总硒含量的比例由大到小依次为:拔节孕穗期>始穗期>扬花授粉期=灌浆期>蜡熟期,硒代蛋氨酸比例随着施硒时期越靠近水稻成熟期越低,表明水稻叶片中硒的转化时间对稻米中硒形态有显著影响,提早喷施硒有利于有机态硒的形成,提高稻米中有机态硒的比例。在硒的生物强化生产富硒水稻中,水稻破口期叶面喷施氨基酸螯合硒的最佳用量为13.5 g/hm^(2),在5个不同生育期喷施13.5 g/hm^(2)的氨基酸螯合硒均能生产出富硒大米,且最佳喷施外源硒的时期为灌浆期。
In order to study the effects of amino acid chelated selenium fertilizer on selenium content and speciation in rice grain,a field experiment was carried out with the rice variety Thyme 139 as the material.Exogenous selenium application with different concentration gradients were set up,and the leaf surface sprayed with amino acid chelated selenium was carried out in the fracture stage of rice.The leaves of rice was sprayed with 13.5 g/hm^(2)of exogenous selenium(calculated as selenium)at five different growth stages,i.e.jointing booting stage,beginning heading stage,flowering stage,grouting stage and wax-ripening stage.The selenium content in different tissues and organs of rice and grain selenium speciation were measured and analyzed in the mature stage.The result showed that sprayed with amino acid chelated selenium increased the content of selenium in different tissues and organs of rice,the selenium content in rice organs increased with the increase of sprayed selenium concentration within the proper range.Selenomethionine(SeMet)was the main form of selenium in rice grains,and the variation of SeMet content in rice grains was consistent with that of total selenium content.The selenium content in rice grains was 0.168,0.431 and 0.439 mg/kg when treated with 6.75,13.5 and 27.0 g/hm^(2)of exogenous selenium,respectively,which reached the local standard of selenium-rich agricultural products in Guangxi,Classification Requirements of Selenium Content in Selenium-rich Agricultural Products(DB45/T 1061-2014).The selenium content in rice grains increased with spraying selenium from the jointing booting stage to the grouting stage,the highest selenium content in rice grains was 0.320 mg/kg which appeared at the selenium treatment sprayed at the grouting stage.The content of SeMet in rice grains accounted for 43%~91%of the total selenium content,the ratio of SeMet content to the total selenium content in rice grains showed:the jointing booting stage>the beginning heading stage>the flowering stage=the grouting stage>the
作者
沈方科
王亚萍
赵雪梅
范晓苏
李云春
顾明华
韦燕燕
周权能
何礼新
SHEN Fang-ke;WANG Ya-ping;ZHAO Xue-mei;FAN Xiao-su;LI Yun-chun;GU Ming-hua;WEI Yan-yan;ZHOU Quan-neng;HE Li-xin(College of Agriculture,Guangxi University,Nanning Guangxi 530005;Soil and Fertilizer Workstation of Guangxi Zhuang Autonomous Region,Nanning Guangxi 530002)
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2022年第6期144-150,共7页
Soil and Fertilizer Sciences in China
基金
广西创新驱动发展专项(桂科AA17202044-5)
南宁市科技重大专项(20172115-1)
广西创新驱动发展专项(AA17202038)。
关键词
水稻
氨基酸螯合硒
籽粒硒含量
硒吸收
硒代蛋氨酸
rice
amino acid chelated selenium
selenium content in rice grain
selenium absorption
selenomethionine
