| 不同冬小麦品种镉富集转运及离子组特征差异 |
| 摘要点击 1788 全文点击 519 投稿时间：2021-07-08 修订日期：2021-08-11 |
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| 中文关键词 小麦 镉(Cd) 基因型差异 富集系数 转运系数 离子组 |
| 英文关键词 wheat cadmium(Cd) genotype differences bioaccumulation factor transport factor ionome |
| 作者 | 单位 | E-mail | | 刘畅 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | 1002572596@qq.com | | 徐应明 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | | | 黄青青 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | | | 陶雪莹 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | | | 王林 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | wanglin2017@caas.cn | | 孙约兵 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | | | 赵立杰 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | |
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| 中文摘要 |
| 为揭示影响冬小麦籽粒镉（Cd）含量品种差异的关键因素，通过大田试验种植3种Cd低积累小麦和2种Cd高积累小麦，研究不同品种各器官Cd的富集转运特征及离子组特征，并通过相关性分析和主成分分析探讨造成不同冬小麦品种籽粒Cd含量差异的关键器官、关键过程及关键元素.结果表明，颖壳、穗轴、节间1和节点1等器官的Cd富集系数，以及穗轴到籽粒、穗轴到颖壳、节间1到穗轴和节点1到节间1等转运过程的Cd转运系数，均与籽粒Cd富集系数显著相关，在主成分分析中Cd高低积累小麦品种的区分上贡献较大，且在高低积累品种间存在显著差异，因此这4个器官是影响小麦籽粒Cd含量基因型差异的关键器官，而这4个过程是控制小麦籽粒Cd累积品种差异的关键过程.离子组分析表明，在影响小麦籽粒Cd累积品种差异的关键器官中Mg和Mn的富集系数，以及关键转运过程中Mo、Cr和Pb的转运系数，均与籽粒Cd富集系数显著相关，且在主成分分析中高低积累小麦品种区分方面贡献较大，因此在上述关键器官和转运过程中，Mg、Mn、Mo、Cr和Pb是影响小麦籽粒Cd累积品种差异的关键元素. |
| 英文摘要 |
| A field trial was conducted to identify the key factors affecting intraspecific variation in the cadmium (Cd) content in the grain of winter wheat. Three wheat cultivars with low Cd accumulation and two wheat cultivars with high Cd accumulation were planted. The Cd accumulation and transport and ionomic traits were examined in different organs of the tested wheat cultivars. Additionally, correlation analysis and principal component analysis were used to identify the key plant organs, translocation pathways, and elements that determine the intraspecific variation in the Cd content in wheat grain. The results showed that the bioaccumulation factors of Cd in glume, rachis, internode 1, and node 1, as well as the transport factors of Cd from rachis to grain, from rachis to glume, from internode 1 to rachis, and from node 1 to internode 1, were significantly correlated with Cd bioaccumulation factors in grain. The above-mentioned bioaccumulation factors and transport factors of Cd made a great contribution to the principal components that could discriminate between the wheat cultivars with low and high Cd accumulation and were significantly different among cultivars. Therefore, glume, rachis, internode 1, and node 1 were the key organs affecting the genotype differences in Cd content in wheat grain, and Cd translocation from rachis to grain, from rachis to glume, from internode 1 to rachis, and from node 1 to internode 1 were the key pathways controlling the variety differences in Cd accumulation in wheat grain. The analysis of wheat ionome showed that the bioaccumulation factors of Mg and Mn in the key organs and the transport factors of Mo, Cr, and Pb in the key transport pathways were significantly correlated with the bioaccumulation factor of Cd in wheat grain and contributed greatly to the differentiation between the wheat cultivars with low and high Cd accumulation in the principal component analyses. Thus, in the above-mentioned key organs and transport pathways, Mg, Mn, Mo, Cr, and Pb were the key elements affecting the genotype differences in Cd content in wheat grain. |
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