土壤镉污染对小麦生长及镉吸收的影响&lt;sub&gt;*&lt;/sub&gt;

文章摘要

土壤镉污染对小麦生长及镉吸收的影响<sub>*</sub>

Effects of cadmium stress in soil on growth and cadmium uptake of wheat

投稿时间：2018-08-23 修订日期：2018-09-11

DOI：

中文关键词: 镉胁迫小麦生长光合生理镉吸收

英文关键词: Cadmium stress Wheat growth Photosynthetic physiology Cadmium uptake

基金项目:

作者	单位	邮编
张婍	南京信息工程大学应用气象学院	210044
李仁英^*	南京信息工程大学应用气象学院	210044
徐向华	南京信息工程大学应用气象学院
谢晓金	南京信息工程大学应用气象学院江苏省农业气象重点实验室
Chambe E.A.	南京信息工程大学应用气象学院江苏省农业气象重点实验室

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中文摘要:

明【目的】明确小麦对镉的吸收状况，可为预测食品安全提供科学依据。【方法】以扬麦13号为材料，采用盆栽试验，分析了不同外源镉污染水平（0、5、10、20 mg?kg-1和50 mg?kg-1）下小麦生长状况、光合生理指标、磷含量及镉吸收的影响，并使用目标危险系数法（THQ）预估了食用该小麦籽粒对人体健康产生的风险。【结果】结果表明，低浓度的外源镉（<10 mg?kg-1）未显著影响小麦的生长速率、各部位生物量、光合生理指标和小麦各部位的磷含量。但当外源镉浓度增大时，小麦生长速率受到抑制。当外源镉浓度≥20 mg?kg-1 时，小麦生物量、蒸腾速率及磷含量显著降低。小麦各部位中的镉含量及籽粒的THQ值都随镉污染水平的增大而增加，且儿童的THQ大于成人且均大于1。【结论】本研究结果显示，虽然中、低浓度的外源镉不会对小麦生长造成显著的影响，但在该环境中生长的小麦籽粒中的镉含量依然会对人体造成明显的不利影响，表明仅依靠镉对小麦的生长影响不足以说明镉对小麦及人体的伤害，必须综合各个指标来讨论。

英文摘要:

It is important to study uptake of Cadmium (Cd) in wheat in order to predict food safety. The effects of different exogenous Cd concentration (0, 5, 10, 20 mg?kg-1 and 50 mg?kg-1) on wheat growth, photosynthetic physiological indexes, phosphorus concentration and Cd uptake were studied by a pot experiment using Yangmai 13 and the risks to human health were also estimated by the target hazard quotients (THQ). The results showed that growth rate, biomass, net photosynthesis rate, transpiration rate and phosphorus concentration of wheat plant weren’t significantly affected by low exogenous Cd concentration. While high exogenous Cd concentration inhibited wheat growth. When exogenous Cd concentration was higher than 20 mg?kg-1, biomass, transpiration and phosphorus concentration of wheat significantly decreased. Cd concentration in stem, leaf and husk of wheat and THQ of Cd in grain all increased with increase of exogenous Cd concentration. The Cd THQ for children is higher than that for adults, and both are more than one. The results showed low exogenous Cd concentration didn’t significantly affect growth of wheat plant, but Cd concentration in edible parts will have a significant adverse impact on human, which indicated that the effect of Cd on wheat growth alone is not enough to explain the harm of Cd to wheat and human. All the indexes must be considered.

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