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Soil microorganisms regulate extracellular enzyme production to maximize their growth rate

Biogeochemistry, 2022-04, Vol.158 (3), p.303-312 [Peer Reviewed Journal]

The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022 ;The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022. ;ISSN: 0168-2563 ;EISSN: 1573-515X ;DOI: 10.1007/s10533-022-00899-8

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Title:
Soil microorganisms regulate extracellular enzyme production to maximize their growth rate
Author: Calabrese, Salvatore ; Mohanty, Binayak P. ; Malik, Ashish A.
Subjects: Biogeosciences ; Biomass ; Carbon ; Carbon content ; Carbon cycle ; Climate change ; Decay ; Decay rate ; Earth and Environmental Science ; Earth Sciences ; Ecosystems ; Environmental Chemistry ; Environmental conditions ; Enzymes ; Extracellular ; Extracellular enzymes ; Global warming ; Growth rate ; Life Sciences ; Mathematical models ; Metabolism ; Microbial activity ; Microorganisms ; Optimization ; Organic carbon ; Organic soils ; Parameterization ; Soil ; Soil microorganisms ; Soils
Is Part Of: Biogeochemistry, 2022-04, Vol.158 (3), p.303-312
Description: Soil carbon cycling and ecosystem functioning can strongly depend on how microbial communities regulate their metabolism and adapt to changing environmental conditions to improve their fitness. Investing in extracellular enzymes is an important strategy for the acquisition of resources, but the principle behind the trade-offs between enzyme production and growth is not entirely clear. Here we show that the enzyme production rate per unit biomass may be regulated in order to maximize the biomass specific growth rate. Based on this optimality hypothesis, we derive mathematical expressions for the biomass specific enzyme production rate and the microbial carbon use efficiency, and verify them with experimental observations. As a result of this analysis, we also find that the optimal enzyme production rate decays hyperbolically with the soil organic carbon content. We then show that integrating the optimal extracellular enzyme production into soil microbial carbon models may change considerably soil carbon projections under global warming, underscoring the need to improve parameterization of microbial processes.
Publisher: Cham: Springer International Publishing
Language: English
Identifier: ISSN: 0168-2563
EISSN: 1573-515X
DOI: 10.1007/s10533-022-00899-8
Source: ProQuest Central

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Soil microorganisms regulate extracellular enzyme production to maximize their growth rate

The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022 ;The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022. ;ISSN: 0168-2563 ;EISSN: 1573-515X ;DOI: 10.1007/s10533-022-00899-8

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