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土壤镉污染对艾纳香生长及体内镉积累和分布特征的影响

ISSN号：1000-5471
期刊名称：《西南师范大学学报：自然科学版》
时间：0
分类：S567.1[农业科学—中草药栽培;农业科学—作物学]
作者机构：[1]贵州医科大学公共卫生学院/环境污染与疾病监控教育部重点实验室,贵阳550025, [2]贵州医科大学生物与工程学院,贵阳550025
相关基金：贵州省科学技术基金项目（黔科合J字[2013]2041号）;贵州省三地联合项目[施中药科合专项（2012）6号];贵阳医学院科学基金项目（2012003）.

关键词：艾纳香, 镉, 亚细胞分布, 富集系数, 转运系数, blumea balsamifera , Cadmium, subcellular distribution , accumulator fa c to r , tra n s lo ca t io n factor

中文摘要：

研究土壤镉（Cd）污染（0.5,2.0,5.0,10.0,20.0和40.0mg/kg）下艾纳香生长及体内Cd的积累和分布特征,以初步了解艾纳香耐镉机制.结果表明：经过120d的盆栽试验,0.5mg/kg Cd处理对艾纳香的生长基本无影响,而2~40mg/kg Cd处理则对植株产生危害,其存活率分别为70%,60%,30%,10%和0%.10mg/kg Cd处理对艾纳香叶、根和植株生物量有明显抑制作用.根、茎、嫩叶和衰老叶中Cd的质量分数随着Cd处理质量分数的增加而增加.Cd在艾纳香各器官积累量从大到小顺序为：衰老叶、嫩叶、茎、根;植株地上部富集系数（3.57~9.51）和转移系数（2.12~9.23）随着Cd处理质量分数的增加而降低,但均大于1.根、茎和叶中Cd的亚细胞质量分数从大到小顺序均为：可溶组分、细胞壁、细胞器,且随着Cd处理质量分数的增加而增加.不同器官细胞壁Cd积累相对比例从大到小顺序均为：茎、叶、根,可溶组分、细胞器Cd积累相对比例因受土壤Cd处理质量分数的影响而变得复杂.艾纳香主要通过可溶组分对镉储存实现对Cd胁迫的适应.

英文摘要：

To understand the tolerant mechanism of Blumea balsamiferato cadmium preliminarily,the experiment was conducted to investigate the effects of different cadmium concentrations of the soil（0.5,2.0,5.0,10.0,20.0and 40.0mg/kg）on plant growth and cadmium accumulation and subcellular distribution in plant.The results show as follows：1.The treatment at cadmium concentration of 0.5 mg/kg had no effects on plant growth,while those between cadmium concentration of 2-40mg/kg did harm to the plants,and resulted in survival rates of 70%,60%,30%,10%and 0,respectively;The treatment at cadmium concentration of 10mg/kg had the obvious inhibitory effects on the biomasses of leaf,root and the whole plant.2.The cadmium concentrations in root,stem,young leaf and old leaf increased with the increasing of cadmium concentrations of the soil;The order of cadmium accumulation in plant different organs was old leafyoung leafstemroot.All the accumulator factors（3.57-9.51）and translocation factors（2.12-9.23）decreased with the increasing of cadmium concentrations of the soil,and were significantly higher than 1.3.The orders of subcellular cadmium contents in root,stem and leaf were soluble fraction cell wall organelle,and all the subcellular cadmium contents increased with the increasing of cadmium concentrations of the soil;The relative ratio of cadmium accumulation in cell wall of plant different organs was the following order,stemleafroot,while those of cadmium accumulation in soluble fraction and organelle became complicated for the same cadmium treatments of the soil.4.The adaptation of Blumea balsamiferato cadmium stress could be achieved by cadmium storage in soluble fraction.

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