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QU Liang,WANG Renjun,ZHAO Peng,CHEN Ruinan,ZHOUWenli,TANG Liuqing,TANG Xuexi. 2014. Interaction between Chlorella vulgaris and bacteria:interference and resource competition. Acta Oceanologica Sinica, 33(1):135-140
Interaction between Chlorella vulgaris and bacteria:interference and resource competition
Interaction between Chlorella vulgaris and bacteria:interference and resource competition
Received:September 11, 2013  Revised:November 28, 2013
DOI:10.1007/s13131-014-0432-7
Key words:Chlorella vulgaris  bacteria Z-QD08  bacteria Z-QS01  interactionmechanism
中文关键词:  Chlorella vulgaris  bacteria Z-QD08  bacteria Z-QS01  interactionmechanism
基金项目:Key Projects of Applied Basic and Frontier Technology Research of Tianjin under contract No. 13JCZDJC29300; scientific research plan program of Tianjin Agricultural University under contract No. 2009D005; the National Natural Science Foundation of China under contract No. 31200400.
Author NameAffiliationE-mail
QU Liang Ocean University of China, Qingdao 300452, China  
WANG Renjun College of Life Science, Qufu Normal University, Qufu 273165, China  
ZHAO Peng Department of Marine Economy, National Marine Data and Information Service, Tianjin 300171, China  
CHEN Ruinan Tianjin Agricultural University, Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Tianjin 300384, China  
ZHOUWenli Tianjin Agricultural University, Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Tianjin 300384, China  
TANG Liuqing Ocean University of China, Qingdao 300452, China  
TANG Xuexi Ocean University of China, Qingdao 300452, China tangxx@ouc.edu.cn 
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Abstract:
      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.
中文摘要:
      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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