Key physiological traits and chemical properties of extracellular polymeric substances determining colony formation in a cyanobacterium

Zhipeng DUAN; Xiao TAN; Qingfei ZENG

doi:10.1007/s00343-022-1353-5

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Key physiological traits and chemical properties of extracellular polymeric substances determining colony formation in a cyanobacterium

Special Section: Cyanobacterial blooms in China: ecology, toxicity, and treatment | Updated：2023-05-19

- Key physiological traits and chemical properties of extracellular polymeric substances determining colony formation in a cyanobacterium
- Journal of Oceanology and Limnology Vol. 40, Issue 5, Pages: 1720-1731(2022)
- Affiliations：
  
  1.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
  2.College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
  3.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
- Author bio：
  
  Xiao TAN,hhualgae@163.com
- Funds：
- DOI：10.1007/s00343-022-1353-5
  CLC：
- Received：26 October 2021，
  
  Accepted：04 December 2021，
  
  Online First：14 January 2022，
  
  Published：2022-09
- Accepted：
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Zhipeng DUAN, Xiao TAN, Qingfei ZENG. Key physiological traits and chemical properties of extracellular polymeric substances determining colony formation in a cyanobacterium[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1720-1731.
DOI：

Zhipeng DUAN, Xiao TAN, Qingfei ZENG. Key physiological traits and chemical properties of extracellular polymeric substances determining colony formation in a cyanobacterium[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1720-1731. DOI： 10.1007/s00343-022-1353-5.

摘要

Abstract

Colony formation of cyanobacteria is crucial for the formation of surface blooms in lakes. However

the underlying mechanisms of colony formation involving in physiological and cell surface characteristics remain to not well be established. Six cyanobacterial

Microcystis

strains (including both unicellular and colonial ones) were employed to estimate the influences of their physiological traits and the composition of extracellular polymeric substances (EPS) on colony or aggregate formation. Results show that raising the number of the photosynthetic reaction center and light-harvesting antenna in the PSII and reducing the growth rate were the major physiological strategies of

Microcystis

to produce excess EPS enhancing colony formation. Tightly bound EPS (T-EPS) was responsible for colony formation

which approximately accounted for 50% of the total amount of EPS. Five fluorescent components (protein-

tryptophan-

and tyrosine-like components and two humic-like components) were found in the T-EPS

although the amounts of these components varied with strains. Importantly

colonial strains contained much higher tyrosine-like substances than unicellular ones. We suggest that tyrosine-like substances might serve as a crosslinking agent to connect other polymers in EPS (e.g.

proteins or polysaccharides) for colony formation. Our findings identified key physiological traits and chemical components of EPS for colony formation in

Microcystis

which can contribute to a better understanding on the formation of

Microcystis

blooms.

关键词

Keywords

references

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