QU Liang, WANG Renjun, ZHAO Peng, CHEN Ruinan, ZHOUWenli, TANG Liuqing, TANG Xuexi. Interaction between Chlorella vulgaris and bacteria:interference and resource competition[J]. Acta Oceanologica Sinica, 2014, 33(1): 135-140. doi: 10.1007/s13131-014-0432-7
Citation: QU Liang, WANG Renjun, ZHAO Peng, CHEN Ruinan, ZHOUWenli, TANG Liuqing, TANG Xuexi. Interaction between Chlorella vulgaris and bacteria:interference and resource competition[J]. Acta Oceanologica Sinica, 2014, 33(1): 135-140. doi: 10.1007/s13131-014-0432-7

Interaction between Chlorella vulgaris and bacteria:interference and resource competition

doi: 10.1007/s13131-014-0432-7
  • Received Date: 2013-09-11
  • Rev Recd Date: 2013-11-28
  • Research of interaction mechanism between Chlorella vulgaris and two bacterial strains (Z-QD08 and Z-QS01) were conducted under laboratory conditions. Growth rates of bacteria and C. vulgaris were tested under co-culture conditions to evaluate the effects of concentrations of C. vulgaris and bacteria on their interactions. To test whether the availability of inorganic nutrients, vitamins and trace metals affects the interactions between C. vulgaris and bacteria, experiments were performed with or without the culture medium filtrate of C. vulgaris or bacteria. The results showed that the growth of C. vulgaris was promoted at low concentrations of bacteria (5×106 cells/ml), and expressed a positive correlation with the bacteria density, whereas opposite trend was observed for treatments with high bacteria density (10×106 cells/ml and 20×106 cells/ml). The growth rate of bacteria decreased with the increasing concentrations of C. vulgaris. The growth of bacteria Z-QD08 was inhibited by C. vulgaris through interference competition, while the mechanism for interaction between bacteria Z-QS01 and C. vulgaris was resource competition. The influence of cell density on the interaction between microalgae and bacteria was also discussed. These experiments confirmsome elements of published theory on interactions between heterotrophic bacteria and microalgae and suggest that heterotrophic bacteria play an important role in the development of blooms in natural waters.
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