| 余林科,杨昕玥,徐小逊,王贵胤,杨占彪,张世熔.叶面喷施硒对紫色小麦镉积累的影响[J].农业环境科学学报,2023,42(4):733-743. |
| 叶面喷施硒对紫色小麦镉积累的影响 |
| Effects of foliar application of selenium on cadmium accumulation in purple wheat |
| 投稿时间：2022-09-01 |
| DOI：10.11654/jaes.2022-0873 |
| 中文关键词: 叶面喷施 镉积累 亚硒酸钠 紫色小麦 亚细胞分布 |
| 英文关键词: foliar application cadmium accumulation sodium selenite purple wheat subcellular distribution |
| 基金项目:四川省科技计划项目（2021YFN0018）；成都市重点研发支撑计划项目（2021-YF05-00959-SN） |
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| 中文摘要: |
| 为降低紫色小麦籽粒对镉（Cd）的积累能力，确保食品安全，本研究采用大田试验分析叶面喷施3种浓度亚硒酸钠（Na2SeO3）溶液对4种紫色小麦Cd含量的影响，并通过分析Cd在小麦中的富集和亚细胞分布特征揭示其作用机理。结果表明：施硒（Se）后小麦各器官Cd含量呈下降趋势，富集系数均显著降低（P<0.05）。施Na2SeO3浓度为0.8 mmol·L-1时，小麦籽粒中Cd含量较对照（不施Se）降低47%~63%。4种小麦茎到籽粒和叶到籽粒的Cd转运系数均显著降低（P<0.05），降幅分别为22%~46%和34%~61%。小麦根和叶亚细胞中的Cd含量均表现为可溶性组分>细胞壁>细胞器，施Se降低了小麦亚细胞各组分中的Cd含量，提高了Cd在根和叶亚细胞可溶性组分中的占比。研究表明，叶面喷施Se能增强紫色小麦对Cd的区室化作用，抑制Cd向籽粒的转运，并使籽粒中Cd含量达到《食品安全国家标准食品中污染物限量》（GB 2762—2017）的要求。 |
| 英文摘要: |
| Due to the large area of cadmium（Cd） contaminated agricultural soils, convenient operation, high efficiency, and environmentally friendly methods for safe food production are necessary. In the current study, a field experiment was conducted to determine the effects of foliar spraying of sodium selenite（Na2SeO3）on Cd concentration in four purple wheat varieties. Furthermore, the enrichment and subcellular distribution characteristics of Cd in plants were investigated. The results showed that the Cd concentration of all wheat organs decreased after the supply of Na2SeO3, and the bioconcentration factor was significantly lower（P<0.05）than that in the control treatment. When the concentration of Na2SeO3 was 0.8 mmol·L-1, the Cd concentration of wheat grains decreased by 47%–63%, compared with the control treatment. In addition, the translocation factor of Cd from the stem to the grain and the leaf to the grain of four wheat varieties significantly decreased（P<0.05）by 22%–46% and 34%–61%, respectively. The concentration of Cd in the subcellular fractions of the plants was in the order of soluble fraction>cell wall>organelle fraction. Application of Na2SeO3 reduced the Cd concentration in each subcellular fraction of wheat plants, and increased the proportion of Cd in the soluble fractions of roots and leaves. These results suggest that foliar spraying of Na2SeO3 could enhance the compartmentalization of Cd in purple wheat, inhibit its transport to grains, and induce its concentration in grains to meet the requirements of the National Standard for Food Safety–Limits of Contaminants in Foods （GB 2762—2017） |
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