土壤铅污染对密毛白莲蒿茎叶解剖结构影响的研究

Effects of Lead Stress on Anatomic Structure of Stems and Leaves of Artemisia Sacrorum var. Messerschmidtiana

对200mg/L铅溶液处理的非矿区、矿区密毛白莲蒿的茎、叶解剖结构进行了比较研究。结果表明,非矿区密毛白莲蒿茎在铅胁迫下组织结构变化较小。矿区密毛白莲蒿茎表现出对铅的适应性,茎表皮加厚,细胞壁加厚,木质部导管壁出现加厚现象,导管中有黑色物质。非矿区密毛白莲蒿叶在铅胁迫下整个组织结构极其松散,组织内部的细胞形状不规则,细胞大小不规律,且排列混乱,部分细胞出现了解体的现象,完整的细胞中叶绿体含量明显减少。而矿区密毛白莲蒿叶解剖结构变化较小,其组织结构较完整而且内部细胞排列很紧密,细胞形状较规则,大小均一。矿区密毛白莲蒿在铅胁迫下表现出了很强的耐受性,为铅污染土壤植物修复的理论研究和技术实施提供了一种新的种质资源。

The morphological anatomy of stems and leaves of Artemisia sacrorum Ledeb.var.messerschmidtiana at 200 mg/L of lead was studied.The changes were manifested as follows：For the stems of non-mining area eco-type at 200 mg/L of lead,there were few changes in the organizational structure.The stems of mining area eco-type showed the adaptability to lead：both the thickness of epidermal and cell wall increased.The thickness of catheter of xylem increased and there was black substance in the catheter.For the leaves of non-mining area eco-type,there were great changes by lead stress.The entire structure of organization was loose;the shape of cell was irregular;the sizes of cells were not the same;some cells appeared disintegration in the organization;and the chloroplast contained in the whole cells decreased significantly.But for the leaves of mining area eco-type,the organization was completed;the cells arranged closely;the shapes of cells were regular;and the sizes of cells were the same.Mining area eco-type appeared strong adaptability to lead stress,which provides an excellent germplasm resource for the theory and practice of phytoremediation of lead contaminated soil.