铜、水分胁迫下金属型植物海洲香薷耐性和生长变化  

Tolerance and Growth Changes of Metallophyte-Elsholtzia haichowensis Treated with Cu and Water Stress

作　　者：李民敬[1,2] 余发新[1] 丁建南[1] 熊治廷[3] 

机构地区：[1]江西省科学院生物资源研究所,江西南昌330029 [2]中国地质大学(武汉)环境学院,湖北武汉430074 [3]武汉大学资源与环境学院,湖北武汉430072

出　　处：《江西科学》2013年第1期26-30,共5页Jiangxi Science

基　　金：江西省科学院省级重点实验室开放基金项目(2010-GS-03)

摘　　要：金属型植物生长土壤重金属含量高,保水性和持水能力差,易造成重金属和干旱双重胁迫。据此,本项目选用污染区(CS)、非污染区海洲香薷(NCS)为试材,以水培方法构成Cu、水分胁迫,研究金属型植物的耐性和生物量的变化。结果表明,Cu、水分胁迫以及"Cu+水分胁迫"处理6 d和14 d后,NCS的根耐性指数(TI)均明显下降,但是CS的TI仅在水分胁迫以及"Cu+水分胁迫"处理14 d明显下降。幼苗处理14 d后,NCS的生长受到Cu、水分胁迫以及"Cu+水分胁迫"的明显抑制,CS的生长受到水分胁迫和"Cu+水分胁迫"的明显抑制,但是NCS的生长抑制作用更为明显。此外,20μMCu对CS生长无明显影响。综之,CS耐Cu胁迫,耐短期干旱,耐"Cu+短期干旱"复合胁迫,但是NCS对这3种形式胁迫均比较敏感。实验结果可为矿山生态恢复及其它污染土壤植物修复提供科学依据。The heavy metals content is high in soils where metallophytes vegetate,and simultaneously, the water retention and moisture holding capacity of the soil is poor. Accordingly, the heavy metal stress and the drought stress is easily formed at the same time. In the experiment, hydroponic method formed Cu and water stress,Elsholtzia haichowensis from the Cu-contaminated （CS） and non-con- taminated soil （NCS） was used as test materials,the root tolerance index and biomass was comparatively researched. The results claimed that under the stress of Cu,drought and Cu ＋ drought for 6 and 14 days,the tolerance index （TI） of NCS significantly decreased, however,TI of CS dramaticaly declined only under the stress of drought and Cu ＋ drought for 14 days. In addition,when the seedlings had been treated for 14 days,the growth of NCS was dramaticly inhibited by Cu stress,water stressand Cu ＋ water stress,and the growth of CS was obviously restrained just by water stress and Cu ＋ water stress,moreover,the growth inhibition of NCS was more seriously than CS. Finally, the growth of CS was slightly affected by 20 IxM Cu. In short, CS was tolerant to Cu stress, short - term water stress and Cu ＋ short-term water stress, but NCS was sensitive to such three kinds of stress. This could provide scientific evidence to mine ecological restoration and the phytoremediation of other pol- luted soils.

关 键 词：铜胁迫 水分胁迫 海洲香薷 耐性指数 生物量 

分 类 号：Q948.115[生物学—植物学] X171[环境科学与工程—环境科学]