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《Chinese Journal of Applied Ecology》 2002-02
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Effects of copper on rhizobia-Acacia auriculaeformis symbiotic association.

NIE Xiangping\+1,LAN Chongyu\+1,ZHANG Zhiquan\+1,SHU Wensheng\+1,HUANG Minghong\+2 ( 1School of Life Sciences,Zhongshan University,Guangzhou 510275; 2Biology Department,Hong Kong Baptist University,Kowloon Tong,Hong Kong).  
The effects of different levels of Cu\+\{2+\} were studied individually on the growth of two Rhizobium strains and host plant growth,nodulation(%) and nitrogen fixation activity in A.auriculaeformis under solution culture conditions so as to explore a probability of utilization of the genus Acacia in revegetation of Cu\+\{2+\}-contaminated land.The results shows that Rhizobium sp.(Acacia auriculaeformis)had more stronger tolerance to Cu\+\{2+\} iron than Rhizobium sp(Lespedeza formosa).The values of EC\-\{50\} respectively achieved 0\^129mmol for Rhizobium sp.and 0\^151mmol for the N\-2-fixation activity.When the concentration of Cu\+\{2+\} was over 0\^50 mmol,N\-2-fixation activity had been inhabited thoroughly.Although the formation of nodules of Acacia auriculaeformis could continued,the growth of host plant had been inhibited with the appearance such as stunting,chlorosis. Between the noinodulating but adding nitrogen treat group and the inodulating without any nitrogen resource treat group, when Cu\+\{2+\}0.125mmol, the latter group showed better growth for A. auriculaeformis. There were higher contents of Cu in the underground tissues than in aboveground tissues.
【Fund】: 国家自然科学基金资助项目 ( 39870 14 5 )
【CateGory Index】: X131.3
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