土壤-烟草系统中烟草叶绿素对Hg、Cd、Pb胁迫的响应

Response of chlorophyll in tobacco leaves on Hg,Cd,Pb stress in soil-tobacco system

摘要

摘要:土壤-烟草系统中烟草叶绿素对Hg、Cd、Pb胁迫的响应试验结果表明，无论3种元素是单一作用、两两作用或是共同作用，烟草叶片中叶绿素含量随各元素处理的浓度增大而明显减少，且呈显著负相关关系，叶绿素a/b值亦如此。3种元素对烟草叶绿素的影响程度为Cd＞Pb＞Hg，呈单元素胁迫＜两两元素作用＜三元素共同作用的趋势，并表现出一定的协合作用。

Abstract:Response of chlorophyll in tobacco leaves on Hg,Cd,Pb stress has been studied by pot experiment in soil-tobacco system.The results show that chlorophyll content and a/b value in tobacco leaves is gradually reduced with increase of Hg,Cd,Pb treatment concentration,whatever it is affected by single one element, two elements or three elements. It is significantly negative correlation between chlorophyll content and concentration of Hg,Cd,Pb.The effect of Hg,Cd,Pb on chlorophyll exists Cd treatment>Pb treatment>Hg treatment,single element treatment