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The changes of nitric oxide production during the growth of Microcystis aerugrinosa |
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| Authors: | Tang Xiang Chen Juan Wang Wen-Hua Liu Ting-Wu Zhang Jun Gao Ya-Hui Pei Zhen-Ming Zheng Hai-Lei |
| Institution: | a Key Laboratory for Subtropical Wetland Ecosystem Research of Ministry of Education of China, Xiamen University, Xiamen, Fujian 361005, PR China b School of Life Sciences, Xiamen University, Xiamen, Fujian 361005, PR China c Department of Biology, Duke University, Durham, NC 27708, USA d State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, PR China |
| Abstract: | This study characterized the changes of nitric oxide (NO) production during the growth of Microcystis aerugrinosa, a cyanobacterium which usually cause cyanobacterial blooms. Results showed a drastic NO release accompanying with cell density and Chl-a content sharp rises when M. aerugrinosa grew from fifth day to sixth day. Moreover, high N:P ratio accelerated the cyanobacterial growth and NO burst. Sodium nitroprusside, an exogenous NO donor, promoted M. aerugrinosa growth with the optimal concentration of 0.1 mg/L. Experiments by supplementing with sodium nitrite and l-arginine demonstrated NO production in M. aerugrinosa cells was mainly through nitrate reductase (NR) pathway while minorly through NO synthase pathway. All these data suggested M. aerugrinosa produced increasing NO during its growth mainly by NR pathway, during which NO positively regulated the growth of M. aerugrinosa. |
| Keywords: | Microcystis aerugrinosa Nitric oxide Eutrophication Cyanobacterial blooms N:P ratio |
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