Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
PHOTOSYNTHESIS AND REGULATION OF RUBISCO ACTIVITY IN NET PHYTOPLANKTON FROM DELAWARE BAY
Autore:
MACINTYRE HL; GEIDER RJ; MCKAY RM;
Indirizzi:
UNIV DELAWARE,COLL MARINE STUDIES,700 PILOTTOWN RD LEWES DE 19958 BROOKHAVEN NATL LAB UPTON NY 11973
Titolo Testata:
Journal of phycology
fascicolo: 5, volume: 32, anno: 1996,
pagine: 718 - 731
SICI:
0022-3646(1996)32:5<718:PARORA>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIBULOSE-BISPHOSPHATE CARBOXYLASE; DIATOM SKELETONEMA-COSTATUM; MARINE PLANKTONIC DIATOM; DYNAMIC LIGHT REGIMES; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE; PHAEODACTYLUM-TRICORNUTUM; THALASSIOSIRA-PSEUDONANA; NUTRIENT AVAILABILITY; DIADINOXANTHIN CYCLE; NATURAL ASSEMBLAGES;
Keywords:
BACILLARIOPHYCEAE; BLOOM; ESTUARINE; FEEDBACK LIMITATION; FLUCTUATING IRRADIANCE; PHOTOSYNTHESIS-IRRADIANCE RESPONSE; PHOTOSYNTHETIC REGULATION; RUBISCO; SKELETONEMA COSTATUM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
89
Recensione:
Indirizzi per estratti:
Citazione:
H.L. Macintyre et al., "PHOTOSYNTHESIS AND REGULATION OF RUBISCO ACTIVITY IN NET PHYTOPLANKTON FROM DELAWARE BAY", Journal of phycology, 32(5), 1996, pp. 718-731

Abstract

Net phytoplankton (> 20 mu m) comprised 51 +/- 9% of the total chlorophyll (Chl) in a Skeletonema costatum-dominated spring bloom in Delaware Bay. The net phytoplankton had low C:N and high protein: carbohydrate ratios, indicating that their growth was nutrient-replete. Their photosynthetic responses were characterized by low specific absorption, low light-limited and light-saturated rates of photosynthesis, and high quantum yields, indicative of acclimation to low irradiance and internal self-shading. High fucoxanthin: Chl ratios also indicated low light acclimation, but high photoprotective xanthophyll: Chl ratios suggested a high capacity for photoprotective energy dissipation. Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) could be activated and deactivated in response to changes in irradiance and was fully activated at the surface of the water column and fully deactivated in aphotic deep water. Maximum Rubisco activity was correlated with Rubisco content and bulk protein content of the phytoplankton and with light-saturated rates of photosynthesis measured in short (< 20-min) incubations. Long (60-min) incubations caused a decrease in the light-saturated rate of photosynthesis, possibly because of feedback limitation. Whilefeedback limitation is unlikely to occur in the water column, it should be considered when estimating productivity in well-mixed waters from fixed light-depth incubations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 20:50:40