Rock Phosphate Solubilization Mechanisms of One Fungus and One Bacterium  

作　　者：LIN Qi-mei, ZHAO Xiaorong, ZHAO Zi-juan and LI Bao-guo(Department of Soil and Water Sciences , China Agricultural University , Beijing 100094 , P. R . China ) 

出　　处：《Agricultural Sciences in China》2002年第9期1023-1028,共6页中国农业科学（英文版）

基　　金：supported by the National Key Project for Basic Research and Development(G1999011803).

摘　　要：Many microorganisms can dissolve the insoluble phosphates like apatite. However, the mechanisms are still not clear. This study was an attempt to investigate the mechanisms of rock phosphate solubiliza-tion by an Aspergillus 2TCiF2 and an Arthrobacter1TCRi7. The results indicated that the fungus produced a large amount of organic acids, mainly oxalic acid. The total quantity of the organic acids produced by the fungus was 550 times higher than that by the bacterium. Different organic acids had completely different capacities to solubilize the rock. Oxalic acid and citric acid had stronger capacity to dissolve the rock than malic acid, tartaric acid, lactic acid, acetic acid, malonic acid and succinic acid. The fungus solubilized the rock through excreting both proton and organic acids. The rock solubilization of the bacterium depended on only proton.Many microorganisms can dissolve the insoluble phosphates like apatite. However, the mechanisms are still not clear. This study was an attempt to investigate the mechanisms of rock phosphate solubiliza-tion by an Aspergillus 2TCiF2 and an Arthrobacter1TCRi7. The results indicated that the fungus produced a large amount of organic acids, mainly oxalic acid. The total quantity of the organic acids produced by the fungus was 550 times higher than that by the bacterium. Different organic acids had completely different capacities to solubilize the rock. Oxalic acid and citric acid had stronger capacity to dissolve the rock than malic acid, tartaric acid, lactic acid, acetic acid, malonic acid and succinic acid. The fungus solubilized the rock through excreting both proton and organic acids. The rock solubilization of the bacterium depended on only proton.

关 键 词：Phosphate-dissolving microorganisms Rock phosphate Solubllization mechanisms 

分 类 号：Q935[生物学—微生物学]