盐肤木幼苗对铅胁迫的生理响应  

Physiological Responses of Rhus chinensis under Lead Stress

作　　者：施翔[1] 王树凤[1] 潘红伟[1] 孙海菁[1] 陈益泰[1] 江泽平[2] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江省林木育种技术研究重点实验室,浙江杭州311400 [2]中国林业科学研究院林业研究所,北京100091

出　　处：《林业科学研究》2016年第1期147-153,共7页Forest Research

基　　金：国家自然科学基金青年科学基金项目(31300509);中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2014QB016,RISF2014004)

摘　　要：矿产资源的不合理开采、农药化肥的大量使用、汽车尾气的排放等,使重金属大量进入土壤环境中,造成土壤污染,这已成为深受全球关注的环境问题之一[1]。过量积累在生物体中的重金属能够通过食物链传递给人或者动物,严重威胁着人类的健康[2];其中,铅（Pb）作为一种广泛存在的潜在环境污染物已经得到广泛关注。[Objective]A greenhouse pot experiment was conducted to evaluate the potential of Rhus chinensis Mill for phytoremediation of lead-contaminated soil. [Method]The response of container seedlings to Pb concentrations（ 0,400 and 1 000 mg · kg- 1） in the soil was studied. Seedling growth,chlorophyll,carotenoid,chlorophyll fluorescence,malondialdehyde（ MDA）,nutrient elements,Pb accumulation and translocation were assessed. [Result]The results showed that R. chinensis did not show visual symptoms of Pb toxicity. Compared to the control,the biomass increased slightly at low concentration（ 400 mg·kg- 1）. Under Pb stress conditions,the root elongation was restrained,while the radial growth of root was promoted and the fine root was developed better. No differences were observed in photosynthetic pigments,chlorophyll fluorescence,and MDA. During the experiment,only small quantity of Pb were uptake by R. chinensis,and most of the Pb absorbed by plants was retained in the roots. However,at the high concentration（ 1 000 mg·kg- 1）,R. chinensis transported metal to the shoots better,and the translocation factor（ TF）value was 0. 66. Under the Pb stress,oxalic acid of root exudates was increased significantly; while the root could be induced malic acid and citric acid,and the concentration increased with Pb concentration in soil. [Conclusion]R.chinensis was found to have Pb tolerance and phytoremediation potential in Pb-contaminated soils.

关 键 词：PB 盐肤木 生理响应 根系形态 根系分泌物 

分 类 号：S792.99[农业科学—林木遗传育种]