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cje ›› 2004, Vol. ›› Issue (2): 32-36.

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Effect of different C sources on the solubilization of rock phosphate by three phosphate solubilizing fungi (PSF)

WANG Guanghua1, ZHOU Keqin1, JIN Jian1, PAN Xiangwen1, ZHAO Ying2   

  1. 1. Institute of Northeast Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin 150040, China;
    2. Technology Extension Center of Heilongjiang Province, Harbin 150001, China
  • Received:2003-03-01 Revised:2003-04-30 Online:2004-04-10

Abstract: Effect of different C sources (glucose, fructose, sucrose, maltose, starch and cellulose) on solubilization of rock phosphate by 3 phosphate solubilizing fungal strains was studied in liquid media. Strain P2.3 had the highest capacity to solubilize rock phosphate when supplied with glucose, and it also had the ability to use long chain Csources such as starch and cellulose to solubilize rock phosphate. However the strains P66 and P39 had the highest phosphate solubilization activities with fructose and maltose supply. But those strains used a little or no starch and cellulose to solubilize rock phosphate. The relationship among pH, titratable acidity values and soluble Pconcentration of the culture filtrate depended on the fungal strains. When inoculated with P2.3, the relationship among each other was very low. But when using P66 and P39, higher correlations appeared among each other. The experimental results showed that the ability differed in using different Csources to solubilize rock phosphate due to different kinds of organic acids produced by different phosphate solubilizing fungi.The rock phosphate solubilized by organic acids produced by different PSF was P66>P39>P2.3.

Key words: Cadmium, Paralichthys olivaceus, Accumulation, Elimination, Total organic carbon

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