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    镉胁迫下烟草镉低积累材料的镉积累分配特征

    The Characteristics of Cd Accumulation in Low-Cd Accumulating Tobacco Cultivars Exposed to Cd

    • 摘要: 为降低烟叶镉含量,保障烟叶安全生产,以烟草镉低积累材料RG11和CF986为研究对象,烟草镉高积累材料Yuyan5为对照,采用土培盆栽试验,分析其在不同镉胁迫下各生育期生物量、镉含量、镉积累量及分配比例,探讨镉胁迫下烟草镉低积累材料镉积累分配特征。结果表明,RG11和CF986不同生育期各器官生物量均随镉处理浓度的增加呈下降趋势,以叶部下降幅度最小(22.64%~27.95%),且其根部和茎部生物量高于Yuyan5,而叶部则差异不显著。RG11和CF986不同生育期各器官镉含量、镉积累量和叶部镉积累速率均随镉处理浓度增加呈增加趋势,且在旺长期其叶部镉积累速率最大;不同镉胁迫下,RG11和CF986各生育期根部和茎部镉含量及镉积累量均显著高于Yuyan5,而叶部则显著低于Yuyan5,为Yuyan5的57.29%~78.02%。不同镉胁迫下,RG11和CF986各生育期不同器官镉的分配表现为:叶 >茎 >根,且其叶部分配率低于Yuyan5,而根部和茎部则高于Yuyan5。烟草镉低积累材料各生育期叶部镉积累能力明显低于高积累材料,且将更少的镉分配于经济器官,这为烟草镉低积累材料的推广应用提供了理论依据。

       

      Abstract: In order to investigate the characteristics of Cd accumulation in different tissues of low-Cd accumulation tobacco cultivars at different growth stages, and to ensure the safe production of tobacco, a pot experiment was conducted to study plant growth, Cd accumulation and distribution in low-Cd accumulation tobacco cultivars at different growth stages. Two low-Cd accumulation tobacco cultivars (RG11andCF986) identified earlier were used with high-Cd accumulation tobacco cultivar Yuyan5 as control. The biomass of different tissues of RG11 and CF986 decreased with increasing Cd concentrations in soils at different growth stages. The leaf biomass of RG11 and CF986 showed the smallest decline of 22.64%-27.95%. The root and stem biomass of RG11 and CF986 were higher than those of Yuyan5. However, no significant difference was observed for leaf biomass among RG11, CF986 and Yuyan5. As Cd concentration in soil increased, so did the Cd concentration, Cd accumulation in tissues and leaf Cd accumulation rate of RG11 and CF986. The leaf Cd accumulation rate at the peak stage was the largest. The Cd concentrations and accumulation in root and stem of RG11 and CF986 were significantly higher than those of Yuyan5, while the Cd concentrations and accumulation in leaves were significantly lower than those of the Yuyan5. The Cd accumulation in different tissues of RG11 and CF986 showed the trend of leaf> stem > root. The proportions of Cd accumulation in leaves of RG11 and CF986 were lower than those of Yuyan5. However, the proportion of Cd accumulation in root and stem of RG11 and CF986 were higher than those of Yuyan5. These results indicated that the low-Cd accumulation tobacco cultivars possessed lower Cd accumulation at different growth stages, which will benefit the practical application of the low-Cd accumulation tobacco cultivars.

       

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