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Titolo:
Ecological significance of compatible solute accumulation by micro-organisms: from single cells to global climate
Autore:
Welsh, DT;
Indirizzi:
Univ Parma, Dipartimento Sci Ambientali, I-43100 Parma, Italy Univ Parma Parma Italy I-43100 ento Sci Ambientali, I-43100 Parma, Italy
Titolo Testata:
FEMS MICROBIOLOGY REVIEWS
fascicolo: 3, volume: 24, anno: 2000,
pagine: 263 - 290
SICI:
0168-6445(200007)24:3<263:ESOCSA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
CLOUD CONDENSATION NUCLEI; SALT-MARSH SEDIMENTS; UPPER WATER COLUMN; TERTIARY SULFONIUM COMPOUNDS; METHYLATED SULFUR-COMPOUNDS; SULFATE-REDUCING BACTERIUM; MEMBRANE PHASE-TRANSITIONS; AEROBIC METHANE OXIDATION; GLYCINE BETAINE TRANSPORT; TROPICAL SOUTH-ATLANTIC;
Keywords:
osmoadaptation; compatible solute; trehalose; glycine betaine; dimethylsulfoniopropionate; dimethylsulfide; stress tolerance; desiccation resistance; thermotolerance; methanogenesis; climate regulation;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
309
Recensione:
Indirizzi per estratti:
Indirizzo: Welsh, DT Univ Parma, Dipartimento Sci Ambientali, Viale Sci, I-43100 Parma, Italy Univ Parma Viale Sci Parma Italy I-43100 , I-43100 Parma, Italy
Citazione:
D.T. Welsh, "Ecological significance of compatible solute accumulation by micro-organisms: from single cells to global climate", FEMS MIC R, 24(3), 2000, pp. 263-290

Abstract

The osmoadaptation of most micro-organisms involves the accumulation of Kions and one or more of a restricted range of low molecular mass organic solutes, collectively termed 'compatible solutes'. These solutes are accumulated to high intracellular concentrations, in order to balance the osmotic pressure of the growth medium and maintain cell turgor pressure, which provides the driving force for cell extension growth. In this review, I discussthe alternative roles which compatible solutes may also play as intracellular reserves of carbon, energy and nitrogen, and as more general stress metabolites involved in protection of cells against other environmental stresses including heat. desiccation and freezing. Thus, the evolutionary selection for the accumulation of a specific compatible solute may nor depend solely upon its function during osmoadaptation, but also upon the secondary benefits its accumulation provides, such as increased tolerance of other environmental stresses prevalent in the organism's niche or even anti-herbivory or dispersal functions in the case of dimethylsulfoniopropionate (DMSP). Inthe second part of the review, I discuss the ecological consequences of the release of compatible solutes to the environment, where they can provide sources of compatible solutes, carbon, nitrogen and energy for other members of the micro-flora. Finally, at the global scale the metabolism of specific compatible solutes (betaines and DMSP) in brackish water, marine and hypersaline environments may influence global climate, due to the production of the trace gases, methane and dimethylsulfide (DMS) and in the case of DMS, also couple the marine and terrestrial sulfur cycles. (C) 2000 Federationof European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 00:40:48