青霉菌对桃树铅胁迫的缓解效应  

The Effect of a Strain of Penicillium on Lead(Pb) Toxicity of Prunus persica L.

作　　者：李奕松[1] 杜立栋[2] 梁为[2] 王有年[2] 

机构地区：[1]北京农学院生物技术系,北京102206 [2]北京农学院植物科学技术系,北京102206

出　　处：《农业环境科学学报》2011年第1期37-41,共5页Journal of Agro-Environment Science

基　　金：北京市自然科学基金重点资助项目(6071001);北京市教委科技发展计划项目(M200510020007)

摘　　要：为了解青霉菌对植物吸收重金属元素铅的影响,把从土壤里分离到的具有铅富集能力的青霉菌(Penicillium Inordinate Arenicolasp.)接种到铅污染不同程度的土壤里,采用盆栽的方法观察这个菌株对毛桃(Prunuspersica L.Batsch)和大久保桃(Prunuspersica L.Batschcv.Okubao)铅胁迫的缓解效应。结果表明:(1)在接种青霉菌的土壤里生长的毛桃和大久保桃的根、茎、叶中铅累积量均比未接种青霉菌的低,茎叶中铅的分配率比未接种青霉菌的低;(2)接种青霉菌相对增加桃苗株高、叶绿素含量、硝酸还原酶及超氧化物歧化酶活性,降低叶片的细胞膜透性;随着土壤中铅胁迫强度的增加,接种青霉菌对增加桃树株高及改善叶片生理特性的效应递减;(3)两个桃树品种的上述生理性状受铅胁迫的影响及青霉菌的缓解效应存在品种间差异。A strain of Penicillium（Penicillium Inordinate Arenicola sp.） with the function of concentrating lead（Pb） from soil was employed to explored the possibility that by using it to decrease the effect of Pb toxicity on the two peach trees（Prunus persica L.Batsch and Prunus persica L.Batsch cv.Okubao） grew on soil with different lead contents.The results indicated that the amount of Pb accumulated whatever in the shoots,roots and leaves of both the peach trees grew on soil inoculated with the Penicillium fungi was lower than the control which did not inoculate the Penicillium fungi,the distribution rates of Pb in the shoots and leaves was also lower than control,and plant height,the contents of chlorophyll,the activity of superoxide dismutase（SOD） and nitrate reductase（NR） of plants grew on the soil treated with Penicillium fungi was higher than that grew on the control soil,the membrane permeability of the cell was lower in treated plants than in control,but with the increasing Pb concentration in the soil,alleviation effect of Penicillium fungi on Pb toxicity was decreased progressively.The impact of Pb stress on the two peaches and alleviation effect of Penicillium fungi on Pb toxicity were different between Prunus persica L.Batsch and Prunus persica L.Batsch cv.Okubao.

关 键 词：青霉菌 铅 桃 

分 类 号：X172[环境科学与工程—环境科学]