Significance of bacterial ectoenzymes in aquatic environments

Chróst, Ryszard J.

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Significance of bacterial ectoenzymes in aquatic environments

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Chróst, Ryszard J.
Department Microbial Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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https://link.springer.com/article/10.1007/BF00007020
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Citation

Chróst, R. J. (1992). Significance of bacterial ectoenzymes in aquatic environments. Hydrobiologia, 243/244, 61-70.

Cite as: https://hdl.handle.net/21.11116/0000-0004-AD0A-F

Abstract

The report presents studies on temporal and spatial variations of kinetics (V_max and K_m) of bacterial ectoenzyme activity (β-glucosidase - βGlc, leucine aminopeptidase - Leu-amp) in the naturally eutrophic Plußsee. βGlc and Leu-amp activity were positively correlated with the flux of polymeric materials (polysaccharides, proteins) in the lake. βGlc activity was low when algal populations grew actively, but during the algal bloom breakdown βGlc activity increased rapidly. Leu-amp displayed the highest rates of activity in the epilimnion and was tightly coupled to bacterial production. The synthesis of studied ectoenzymes was under control of a repression/derepression mechanism. The significance of ectoenzymes for the transformation and bacterial utilization of organic matter, and their role in the microbial loop in aquatic environments is discussed.