不同土壤类型上低水平镉污染对小麦植物络合素合成的影响  

Effect of Lower Level of Cadmium Pollution on Wheat Phytochelatin Synthesis in the Different Soil Types

作　　者：刘衡[1] 吕家珑[1] 刘克[1] LIU Heng LU Jialong LIU Ke(College of Natural Resource and Environment, Northwest A＆F University, Yangling Shaanxi 712100, China)

机构地区：[1]西北农林科技大学资源环境学院,农业部西北植物营养与农业环境重点实验室,陕西杨陵712100

出　　处：《西北农业学报》2017年第1期121-131,共11页Acta Agriculturae Boreali-occidentalis Sinica

基　　金：农业部公益性行业(农业)科研专项(200903015);国家“十二五”科技支撑计划项目子课题(2012BAD15B04)~~

摘　　要：通过在中国18种不同农田土壤背景下设置较低水平的重金属镉(Cd)污染,研究小麦分蘖期叶片中非蛋白巯基(TNP)、谷胱甘肽(GSH)和植物络合素(PCs)的合成情况。结果表明,低水平土壤Cd(0.3~1.2mg/kg)污染导致小麦TNP、GSH、PCs的合成量显著改变,其中以PCs反应最敏感,两者存在一定的剂量-效应关系。研究还发现,土壤Cd污染下植物PCs合成量与部分土壤理化指标间存在显著的相关性,表明土壤种类间复杂多变的理化性质可能会通过不同途径影响植物PCs的合成。说明在试验设定范围内可通过检测植物PCs含量来预测或评价土壤重金属Cd的污染情况。In this study, heavy metal cadmium （Cd） pollution were set through 18 different farmland soil in China, the synthesis of nonprotein thiols （TNP）, glutathione （GSH） and the plant phytochelations （PCs） content were determined at wheat tillering stage. Results show that the lower level Cd of soil pollution （Cd mass ratio of 0. 3--1. 2 mg/kg） led to the significant changes in the amount of wheat＇s TNP,GSH and PCs. In particularly, PCs was more sensitive to even lower level of Cd pollution in soil, a significant dose-effect relationship was detected between PCs and Cd. This result demonstrated that there was a significant correlation between PCs synthesis and some soil physical and chemical properties under the soil cadmium pollution, which indicated that the synthesis of PCs in plant may be effected by the complicated unstable physical and chemical properties between soil types. This work further confirmed that heavy metal Cd pollution of soil can be predicted or graded by detecting plant PCs at the range of the experimental setting.

关 键 词：农田土壤 镉污染 植物络合素 土壤理化性质 

分 类 号：X53[环境科学与工程—环境工程] X56