流体切应力对铜绿微囊藻细胞活性的影响

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Abstract To study the effect of the shear stress on the cell activity of Microcystis aeruginosa, its growth under shear stresses, 0.0, 0.3, 0.6 and 0.9 Pa, was investigated accordingly, and the changes of the algal-cell physiological indicator and the algal-fluid indicator were analyzed. The results indicated that the shear stress below 0.6 Pa can cause the density and photosynthetic pigment content of Microcystis aeruginosa cells increase, promoting their growth and reproduction.The photosynthetic intensity and the nutrient utilization were enhanced by the most favorable shear-stress condition (0.6Pa) for growth, while the cell structure was not excessively damaged. However, the high shear stress, 0.9Pa, would affect the membrane permeability of the algal cells by breaking their structure, thereby inhibiting their growth and metabolism.The results demonstrated that the growth of Microcystis aeruginosa cells was affected by the fluid shear stress, manifested as “low promotion and high inhibition”, where their activity was enhanced by moderate shear stress, and their growth was inhibited by the high shear stress. The findings provided a hint or an approach for preventing and managing Microcystis aeruginosa blooms in water bodies, such as lakes and reservoirs.

Key words： water bloom shear stress Microcystis aeruginosa photosynthesis cell membrane

Received: 18 July 2022

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X172

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	LIU Ren-jing
	JIANG Wen-tao
	XU Kai-ren
	LI Zhong-you
	LI Xiao
	MIN Lei
	LIANG Ying

Cite this article:

LIU Ren-jing,JIANG Wen-tao,XU Kai-ren等. Effect of fluid shear stress on activity of Microcystis aeruginosa cells[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 896-903.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I2/896

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