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Titolo:
The influence of 'host release factor' on carbon release by zooxanthellae isolated from fed and starved Aiptasia pallida (Verrill)
Autore:
Davy, SK; Cook, CB;
Indirizzi:
Harbor Branch Oceanog Inst Inc, Div Marine Sci, Dept Symbiosis & Coral Biol, Ft Pierce, FL 34946 USA Harbor Branch Oceanog Inst Inc Ft Pierce FL USA34946 ierce, FL 34946 USA
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY
fascicolo: 2-3, volume: 129, anno: 2001,
pagine: 487 - 494
SICI:
1095-6433(200106)129:2-3<487:TIO'RF>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORAL PLESIASTREA-VERSIPORA; ISOLATED SYMBIOTIC ALGAE; FREE AMINO-ACIDS; REEF CORALS; STYLOPHORA-PISTILLATA; AMMONIUM ENHANCEMENT; NITROGEN LIMITATION; GLYCEROL METABOLISM; SYMBIODINIUM SP; IN-VITRO;
Keywords:
carbon flux; coral; host release factor; nutritional status; photosynthesis; sea anemone; symbiosis; zooxanthellae;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Davy, SK Univ Plymouth, Inst Marine Studies, Plymouth PL4 8AA, Devon, England Univ Plymouth Plymouth Devon England PL4 8AA 8AA, Devon, England
Citazione:
S.K. Davy e C.B. Cook, "The influence of 'host release factor' on carbon release by zooxanthellae isolated from fed and starved Aiptasia pallida (Verrill)", COMP BIOC A, 129(2-3), 2001, pp. 487-494

Abstract

Symbiotic dinoflagellates (zooxanthellae) typically respond to extracts ofhost tissue with enhanced release of short-term photosynthetic products. We examined this 'host release factor' (HRF) response using freshly isolatedzooxanthellae of differing nutritional status. The nutritional status was manipulated by either feeding or starving the sea anemone Aiptasia pallida (Verrill). The release of fixed carbon from isolated zooxanthellae was measured using C-14 in 30 min experiments. Zooxanthellae in filtered seawater alone released approximately 5% of photosynthate irrespective of host feeding history. When we used a 10-kDa ultrafiltrate of A. pallida host tissue asa source of HRF, approximately 14% of photosynthate was released to the medium. This increased to over 25% for zooxanthellae from anemones starved for 29 days or more. The cell-specific photosynthetic rate declined with starvation in these filtrate experiments, but the decline was offset by the increased percentage release. Indeed, the total amount of released photosynthate remained unchanged, or even increased, as zooxanthellae became more nutrient deficient. Similar trends were also observed when zooxanthellae from A. pallida were incubated in a 3-kDa ultrafiltrate of the coral Montastraea annularis, suggesting that HRF in the different filtrates operated in a similar manner. Our results support the suggestion that HRF diverts surplus carbon away from storage compounds to translocated compounds such as glycerol. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 01:55:21