铅胁迫对景天属和花生属植物生理特性和根系分泌物的影响  

Effects of Lead Stress on Root Exudates and Physiological Characteristics of Sedum and Arachis Plants

作　　者：聂磊[1] 官晓东[1] 钟秋凤[1] 

机构地区：[1]广州城市职业学院城市建设工程系,广州510405

出　　处：《湖北农业科学》2014年第16期3760-3764,3769,共6页Hubei Agricultural Sciences

基　　金：国家星火计划项目(2011GA7800);广州市科技计划项目(N2010Z1-E211);广州市羊城学者科研项目(10B004D)

摘　　要：在水培条件下,用1000mg/L铅(Pb)处理景天属(Sedum)的野生种植物紫叶景天(Sedum telephium)和栽培种植物佛甲草(Sedum lineare),花生属(Arachis)的野生种植物蔓花生(Arachis duranensis)和栽培种植物花生(Arachis hypogaea)后发现,景天属植物佛甲草和花生属植物蔓花生、花生等叶片相对电导率、MDA含量都明显升高,叶绿素含量、根系活力不同程度降低,生物量积累明显下降;来自非洲草原的紫叶景天基本上不受Pb胁迫的影响。Pb处理下景天属和花生属植物根系分泌的总有机酸和可溶性糖含量均有所增加,且表现出明显的种间差异。在Pb胁迫下,花生属植物的有机酸分泌强度要明显高于景天属植物,野生种类的分泌强度要明显超过栽培种类。景天属植物根系分泌的有机酸主要种类为草酸、酒石酸、苹果酸和柠檬酸;花生属植物根系分泌的有机酸主要种类为柠檬酸、草酸和琥珀酸。Hydroponic experiments were conducted to investigate the impact of lead stress on root exudates and growth physiological characteristics by Papilionaceae species （Arachis duranensis, Arachis hypogaea） and Crassulaceae species （Sedum telephium, Sedum lineare） in the level of 1 000 mg./L. The metabolism capacity and stress resistance of wild species under lead acetate solution culture were significantly better than that of the cultivated species. Lead contamination promoted the root exudation of organic acids and soluble carbohydrate in all experimental species. The promotion in wild species was significantly different from the cultivated speeeeies. Citric acid, oxalic acid and suecinic acid were induced in root secretion of Arachis duranensis and Arachis hypogaea under high levels of Pb2＋. Oxalic acid, tartaric acid, citric acid and malic acid exudation were found in roots of S. telephium and S. lineare.

关 键 词：铅胁迫 景天属(Sedum) 花生属(Arachis) 根系分泌物 生理特性 

分 类 号：X53[环境科学与工程—环境工程]