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Titolo:
Thermal acclimation in the marine diatom Chaetoceros calcitrans (Bacillariophyceae)
Autore:
Anning, T; Harris, G; Geider, RJ;
Indirizzi:
Univ Essex, Dept Biol Sci, Colchester CO4 3SQ, Essex, England Univ Essex Colchester Essex England CO4 3SQ ester CO4 3SQ, Essex, England Marine Biol Assoc United Kingdom Lab, Plymouth PL1 2PB, Devon, England Marine Biol Assoc United Kingdom Lab Plymouth Devon England PL1 2PB gland
Titolo Testata:
EUROPEAN JOURNAL OF PHYCOLOGY
fascicolo: 3, volume: 36, anno: 2001,
pagine: 233 - 241
SICI:
0967-0262(200108)36:3<233:TAITMD>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-TEMPERATURE MIMICS; CHLOROPHYLL-A; SKELETONEMA-COSTATUM; LAMINARIA-SACCHARINA; CHLORELLA-VULGARIS; LIGHT-INTENSITY; PHOTOSYNTHESIS; PHYTOPLANKTON; GROWTH; CARBON;
Keywords:
carotenoids; Chaetoceros; chlorophyll; photosynthesis; thermal acclimation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Geider, RJ Univ Essex, Dept Biol Sci, Colchester CO4 3SQ, Essex, England Univ Essex Colchester Essex England CO4 3SQ SQ, Essex, England
Citazione:
T. Anning et al., "Thermal acclimation in the marine diatom Chaetoceros calcitrans (Bacillariophyceae)", EUR J PHYC, 36(3), 2001, pp. 233-241

Abstract

Thermal acclimation following changes from 6 degreesC to 15 degreesC and from 15 degreesC to 25 degreesC, was investigated in the diatom Chaetoceros calcitrans. Cell division rate increased with temperature. Cellular carbon showed a slight decrease with an increase in temperature from 6 degreesC to15 degreesC but showed no further change with an increase to 25 degreesC. Cells grown at 6 degreesC had low levels of light-harvesting components anda high carotenoid to chlorophyll a (Chla) ratio due to an increase in abundance of photoprotective pigments. The abundance of light-harvesting pigments increased with temperature and this was mirrored by a decrease in carotenoid: Chla ratio. All pigments showed an immediate change in abundance following each temperature shift. However, changes in photoprotective pigments reached a plateau after 12 h, in contrast to the light-harvesting pigments that took 4 days to become acclimated. Light-saturated rates of photosynthesis were at a minimum at 6 degreesC and increased twofold with temperature between 6 degreesC and 25 degreesC. Light-limited photosynthesis showed little change with temperature. It is suggested that, at low temperatures, therate of carbon fixation is impaired due to a decrease in the activity of photosynthetic enzymes. This imparts an increase in excitation pressure due to an imbalance between light absorption and utilization. Cells respond to this by decreasing their light-harvesting capacity and increasing their ability to dissipate the excess energy. This fairly rapid regulation may be ecologically advantageous in areas where there are transient temperature changes.

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Documento generato il 04/12/20 alle ore 09:48:21