不同铅水平下紫茎泽兰细胞内铅的分布和化学形态的分析

Subcellular distribution and chemical forms of lead in Eupatorium adenophorum at different lead levels

该研究运用差速离心法和化学试刑逐步提取法，分析了重金属铅在紫茎泽兰亚细胞内的分布和主要化学形态。结果表明：随着Ph浓度的升高，紫茎泽兰的叶、根、茎中各亚细胞组分Pb含量逐渐增加；紫茎泽兰中的Pb在叶片分布于可溶性部分和细胞壁中，两者占总量的75．34％～84．63％；茎也主要分布于可溶性部分和细胞壁中，占总量的36．10％～57．14％和20．07％～36．52％；而在根中则富集于细胞壁和可溶性部分，分别占39．2％．49．78％和28．27％～37．62％，其他细胞器中的Pb含量均较少。紫茎泽兰叶中的Pb以盐酸提取态和水提取态为主，两者占总量的58．74％～73．04％；茎中的Pb以醋酸提取态和氯化钠提取态为主；而根中的Pb则以醋酸提取态和盐酸提取态占优势，两者占总量的39．15％～52．91％。

The differential centrifugation technique and sequential chemical extraction method were used to study the subcellular distribution and chemical forms of lead in the roots, leaves and stems of Eupatorium adenophorum. The re- sults showed that with the increasing of lead levels, the contents of lead in subcellular distribution of leaves, sterns and roots significant increased. The lead distributed mainly in the soluble partition and cell wall in leaves, occupied 75.34%-84.63% of the total. Lead distributed in stems were similar to it in leaves. It mainly accumulated in the solu- ble partition and cell wall, which occupied 36.10%-57.14% and 20.07%-36.52%, respectively. And it distributed mainly in cell wall and soluble partition in roots, which occupied 39.20%-49.78% and 28.27%-37.62%, respectively. There was less lead in other organelles. The chemical forms of lead in leaves of E. adenophorum were mainly in HCl and water, occupied 58.74%-73.04% of the total. In stems, the main chemieal forms were HAc and NaCl, and the chemical forms of HAc and HCl were predominant in roots, occupied 39.15%-52.91% of the total.