镉胁迫下烟草镉低积累材料的镉积累分配特征

发布时间：2018-01-13 22:02

本文关键词：镉胁迫下烟草镉低积累材料的镉积累分配特征　出处：《中国烟草科学》2017年05期 　论文类型：期刊论文

【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 reduce the content of cadmium in tobacco leaf and ensure the safe production of tobacco leaf, the pot experiment of tobacco cadmium accumulation material (RG11 and CF986) and the high accumulation material of tobacco cadmium (Yuyan5) was carried out by soil culture. The biomass, cadmium content, cadmium accumulation and distribution ratio of tobacco under different cadmium stress were analyzed, and the characteristics of cadmium accumulation and distribution of tobacco low accumulation materials under cadmium stress were discussed. The biomass of each organ of RG11 and CF986 decreased with the increase of cadmium concentration, and the leaf decreased by 22.64% 27.95%. The biomass of roots and stems was higher than that of Yuyan5, but the content of cadmium in leaves was not significant. RG11 and CF986 at different growth stages. Cadmium accumulation and leaf cadmium accumulation rate increased with the increase of cadmium concentration, and in the peak period, the leaf cadmium accumulation rate was the highest. Under different cadmium stress, the CD content and CD accumulation in roots and stems of RG11 and CF986 were significantly higher than those in Yuyan5, but lower in leaves than in Yuyan5. The distribution of cadmium in different organs of RG11 and CF986 under different cadmium stress was as follows: leaf stem and root. The leaf distribution rate of tobacco was lower than Yuyan5, but the root and stem was higher than Yuyan5.The accumulation ability of cadmium in leaves of tobacco low accumulation materials was significantly lower than that of high accumulation materials. The distribution of less cadmium in economic organs provides a theoretical basis for the popularization and application of low cadmium accumulation materials in tobacco.
【作者单位】：四川农业大学资源学院;四川省农业机械化干部学校;四川省烟草公司凉山州公司;
【基金】：国家科技支撑计划“重金属超标农田原位/固定与农艺调控技术研究”(2015BAD05B01) 四川省教育厅项目“镉安全水稻亲本材料的筛选及其生理机制”(14ZB0017)
【分类号】：S572;X173
【正文快照】： 四川西昌615000)近年来土壤重金属污染问题成为关注焦点[1]。其中,镉(Cd)被国际癌症研究机构归类为已知的生物毒性最强的重金属,其在土壤中能稳定积累且极易被植物吸收[2]。烟草是世界范围内广泛种植的重要经济作物之一,其对镉的富集能力较强(富集系数可达5~10),且主要积累于

【相似文献】