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1. Pseudobodo sp, a new pathogen for a potential energy-producing algae: Chlorella vulgaris cultures | |||
Chen Zhangran,Lei Xueqian,Zhang Jingyan,Zheng Wei,Zheng Tianling | |||
Biology 28 November 2013 | |||
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Abstract:Chlorella vulgaris, which could serve as a potential source of food and energy because of its photosynthetic efficiency, is a genus of single-celled green algae, belonging to the phylum Chlorophyta. In our study, a pathogenic organism targeting C. vulgaris was discovered. 18S rRNA gene sequence analysis revealed that it shared 99.0% homology with the protist Pseudobodo tremulans. Scanning electron microscope analysis showed that Pseudobodo sp cells were approximately 4-5 μm long, biflagellate with an anterior collar around the anterior part of the cell in unstressed feeding cells. The lytic activity relates to a sub-cellular fraction that is blocked on a 0.22 μm filter because the lytic activity was lost after its lysates were filtered through 0.22 μm membranes. Besides the initial host, Pseudobodo sp KD51 could also kill other algae, indicating its relatively wide inhibitory spectrum. Heat stability, pH and salinity tolerance were tested to understand its inhibitory activities, and the results showed that it was heat-sensitive, and pH and salinity tolerant. | |||
TO cite this article:Chen Zhangran,Lei Xueqian,Zhang Jingyan, et al. Pseudobodo sp, a new pathogen for a potential energy-producing algae: Chlorella vulgaris cultures[OL].[28 November 2013] http://en.paper.edu.cn/en_releasepaper/content/4571332 |
2. A red-tide causing algae- Alexandrium tamarense lysed by bacteria in phycosphere | |||
Wang Xin,Li Zhi Jiang,Ning Xiu Rental,Zheng Tian Ling | |||
Biology 09 January 2009 | |||
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Abstract:There were stabilized bacteria community in the xenic culture of Alexandrium tamarense, a red-tide causing algal. But little was known about the interaction between algal and bacteria community in its phycosphere. The objective of the current study was to determin the effect of bacteria in Alexandrium tamarense phycosphere on the growth of the algal. We added One percent (v/v) of 2216E medium to Alexandrium tamarense culture to alter the growth of bacteria. These results showed that algal cells were all lysed within 16 hours . After adding 2216E medium, both the abundance and the extracellular enzyme activity of bacteria increased by 50-100 times from the 6th hour to the 10th hour in lysis of algae. 16S rRNA gene fragments of most Bacteria were amplified from DNA extracted from cultures and were analyzed by denaturing gradient gel electrophoresis and sequencing. The structure of bacteria community changed greatly in the process of algal lysis. Two bacteria strains, Alteromonas sp. and Thalassobius aestuarii sp. might be responsible for the algal lysing. And The β-D-glucosidase and chitinase produced by bacteria in phycosphere could directly cause the lysis of algae. These experiments provide an evidence of that bacteria in the phycosphere play a key role in Alexandrium tamarense culture ecosystem. | |||
TO cite this article:Wang Xin,Li Zhi Jiang,Ning Xiu Rental, et al. A red-tide causing algae- Alexandrium tamarense lysed by bacteria in phycosphere[OL].[ 9 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27578 |
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