不同品种玉米镉的积累特性
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湖南省现代农业产业体系(湘农发[2019]105号)


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    摘要:

    以8个玉米品种为材料,在2个地区开展田间试验,研究在不同土壤镉浓度下成熟期玉米各器官(根、茎、叶及籽粒)吸收镉(Cd)的特性,比较各器官的Cd含量差异,并对各器官的Cd含量进行相关性分析。在浏阳基地,不同品种玉米的根、茎、叶和籽粒Cd的富集系数分别为0.85~1.09、0.44~0.86、0.64~1.36和0.04~0.25;茎、叶、籽粒Cd的转运系数分别为0.42~0.91、0.59~1.44和0.05~0.27;相关性分析结果表明,茎秆与叶片的Cd含量呈极显著正相关。在湖南农业大学耘园基地,不同品种玉米的根、茎、叶、籽粒的富集系数分别为3.00~4.12、1.93~3.20、2.18~3.96和0.16~0.94;茎、叶和籽粒Cd的转运系数分别为0.63~0.86、0.61~1.30和0.04~0.24;相关性分析结果表明,茎与叶、籽粒的Cd含量呈极显著正相关。各器官Cd积累情况分为2种,一种为叶、根、茎、籽粒的Cd含量依次降低,另一种是根、叶、茎、籽粒的Cd含量依次降低。在浏阳基地种植的湘农玉22号籽粒的Cd含量超过食品安全的国家标准,而在耘园基地种植的湘农玉22号籽粒的Cd含量未超标,其余7个品种在2个地区种植均未超过国家标准。

    Abstract:

    Field experiments were conducted to explore the characteristics of cadmium uptake in various organs(roots, stems, leaves and grains) of eight maize varieties exposed to varying cadmium concentrations across different regions. The study involved comparing cadmium(Cd) content across organs at maturity, and performing correlation analysis on Cd content in each organ. Results showed that in Liuyang, the enrichment coefficients of Cd in roots, stems, leaves and grains of different varieties ranged from 0.85 to 1.09, 0.44 to 0.86, 0.64 to 1.36 and 0.04 to 0.25, respectively. The transport coefficients of Cd in stems, leaves and grains ranged from 0.42 to 0.91, 0.59 to 1.44 and 0.05 to 0.27, respectively. Correlation analysis indicated a positive relationship between stems and leaves. In Yunyuan, the enrichment coefficients of Cd in roots, stems, leaves and grains of different varieties ranged from 3.00 to 4.12, 1.93 to 3.20, 2.18 to 3.96 and 0.16 to 0.94, respectively. The Cd transport coefficients of stems, leaves and grains varied from 0.63 to 0.86, 0.61 to 1.30 and 0.04 to 0.24, respectively. Correlation analysis showed an extremely significant positive correlation between Cd contents in stems and leaves, as well as stems and grains. Statistical analysis revealed two types of Cd accumulation distribution in organs: (1) Cd contents of leaf, root, stem and grain decreased successively; (2) Cd contents of root, leaf, stem and grain decreased successively. Notably, Cd content of Xiangnongyu22 grains grown in Liuyang at this Cd concentration exceeded the “National Food Safety Standard Limits of Contaminants in Foods”. However, Xiangnongyu22 planted in Yunyuan met the standard, and the remaining seven varieties grown in both regions complied with the “National Food Safety Standard Limits of Contaminants in Foods”.

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武清贵,田丰,郑冉,吕丹,刘松芹,罗红兵.不同品种玉米镉的积累特性[J].湖南农业大学学报:自然科学版,2023,49(4):.

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  • 在线发布日期: 2023-09-05
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