摘要:
研究土壤镉(Cd)污染(0.5,2.0,5.0,10.0,20.0和40.0 mg/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,0.5 mg/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丽增加.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.
关键词:
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艾纳香
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镉
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亚细胞分布
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富集系数
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转运系数
Abstract:
To understand the tolerant mechanism of Blumea balsamifera to cadmium preliminarily,the experiment was conducted to investigate the effects of different cadmium concentrations of the soil (0.5,2.0,5.0,10.0,20.0 and 40.0 mg/kg) on plant growth and cadmium accumulation and subeellular 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 2-40 mg/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 leaf＞young leaf＞stem＞root.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,stem＞leaf＞root,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 balsamifera to cadmium stress could be achieved by cadmium storage in soluble fraction.
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