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杨亮§,孙发宇§,李 磊,顾世梁,李 韬.小麦硒敏感性的基因型差异分析[J].土壤,2018,50(6):1190-1197. Yang Liang,Sun Fayu,LI Lei,GU Shiliang,LI Tao.Genotypic Differences of Wheat Sensitivity to Selenium Application[J].Soils,2018,50(6):1190-1197 本文二维码信息
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小麦硒敏感性的基因型差异分析
Genotypic Differences of Wheat Sensitivity to Selenium Application
投稿时间:2018-07-06  修订日期:2018-08-09
DOI:10.13758/j.cnki.tr.2018.06.021
中文关键词:  小麦    耐性评价
Key Words:Wheat  Selenium  Tolerance evaluation
基金项目:国家自然科学基金项目(31771772)和江苏高校优势学科建设工程项目(PAPD)资助。
作者单位E-mail
杨亮§ 扬州大学 851228482@qq.com 
孙发宇§ 扬州大学  
李 磊 扬州大学江苏省作物遗传生理国家重点实验室培育点/粮食作物现代产业技术协同创新中心/ 教育部植物功能基因组学重点实验室  
顾世梁 扬州大学江苏省作物遗传生理国家重点实验室培育点/粮食作物现代产业技术协同创新中心/ 教育部植物功能基因组学重点实验室  
李 韬 扬州大学江苏省作物遗传生理国家重点实验室培育点/粮食作物现代产业技术协同创新中心/ 教育部植物功能基因组学重点实验室 taoli@yzu.edu.cn 
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中文摘要:
      土壤中硒分布不均匀,富硒土壤中硒含量可达1 200 mg/kg,硒含量过高对大多数植物均有毒害作用。小麦是我国重要的主要粮食作物,筛选硒耐性强的小麦品种有利于实现小麦在富硒地区更好的推广。本研究选择99份小麦品种(系)进行盆栽试验,在拔节期进行处理设置(硒处理每盆硒酸钠用量120 mg/L,记作Se120;以硒酸钠0 mg/L处理为对照,记作CK),比较不同品种(系)小麦硒处理下农艺性状的变化。结果表明:与CK相比,过量施硒后小麦籽粒千粒重显著提高(P<0.01),株高、有效叶面积、单株叶片数和功能叶片数均显著下降(P<0.01),SPAD值(叶绿素相对含量)则没有显著变化。以Se120和CK之间农艺性状的差异作为小麦的耐硒性指标,通过马氏距离综合评估不同小麦品种对硒的耐受性和敏感性差异,结合聚类分析,发现X325、淮麦18、扬麦15号、淮9440、扬麦11是典型的耐硒品种,而扬麦2号和Corrine是典型的硒敏感型品种。
Abstract:
      Selenium (Se) distribution in surface soil is non-uniformed. Se content in Se-enriched soil can reach 1 200 mg/kg, toxic to most plants growing in these areas. Therefore, it is important to screen wheat varieties with strong tolerance of Se in Se-rich areas. Ninety-nine wheat varieties were selected for Na2SeO4-tolerance pot experiment. Na2SeO4 (120 mg Na2SeO4 per pot in 1 L water) (Se120) was applied at the jointing stage of wheat with 0 mg Na2SeO4 per pot in 1 L water as control (CK). Chlorophyll content in leaves in heading period (represented by SPAD value), plant height (PH), the green leaf area (GLA), leaf number per plant (NPP) and the number of functional leaf (NFL) were measured in 25 days after flowering for each treatment. Thousand-kernel weight (TKW) was measured after harvest. The differences of these agronomic traits between Se120 and CK was studied. The results indicated that Se120 treatment significantly increased TKW of wheat grains (P<0.01), decreased PH, GLA, NPP and NFL significantly (P<0.01) compared with the CK, but there was no significant impact on SPAD(P>0.05). The differences of agronomic traits between Se120 and CK were taken as an index of wheat Se tolerance. The Mahalanobis distances method and cluster analysis were employed to comprehensively evaluate Se tolerance and sensitivity of wheat. It was found that X325, Huaimai18, Yangmai15, Huai9440 and Yangmai11showed high Se tolerance while Yangmai2 and Corrine were Se sensitive cultivars. This study provides useful information for breeding of wheat varieties with Se tolerance ability and for Se biofortification in wheat.
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