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RECORD NUMBER: 15 OF 17

OLS Field Name OLS Field Data
Main Title Response of the Photosynthetic Apparatus of 'Phaeodactylum tricornutum' (Bacillariophyceae) to Nitrate, Phosphate, or Iron Starvation.
Author Geider, R. J. ; La Roche, J. ; Greene, R. M. ; Olaizola, M. ;
CORP Author Delaware Univ., Lewes. Coll. of Marine Studies. ;Brookhaven National Lab., Upton, NY. Oceanographic and Atmospheric Sciences Div.;Environmental Research Lab., Narragansett, RI.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-94/506 ; ERLN-X219
Stock Number PB95-148680
Additional Subjects Photosynthesis ; Diatoms ; Nutritional deficiencies ; Photochemical reactions ; Starvation ; Nitrates ; Phosphates ; Iron ; Pigments ; Bioindicators ; Aquatic microorganisms ; Phaeophyta ; Reprints ; Phaeodactylum tricornutum ; Bacillariophyceae
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB95-148680 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 05/26/1995
Collation 14p
Abstract
The effects of nitrate, phosphate, and iron starvation and resupply on photosynthetic pigments, selected photosynthetic proteins, and photosystem II (PSII) photochemistry were examined in the diatom Phaeodactylum tricornutum Bohlin (CCMP 1327). Although cell chlorophyll a (chl a) content decreased in nutrient-starved cells, the ratios of light-harvesting accessory pigments (chl c and fucoxanthin) to chl a were unaffected by nutrient starvation. The ratio of the xanthophyll cycle pigments diatoxanthin and diadinoxanthin to chl a increased during nutrient starvation. These pigments are thought to play a photoprotective role by increasing dissipation of excitation energy in the pigment bed upstream from the reaction centers. The relative abundance of the carboxylating enzyme, ribulose bisphosphate carboxylase/oxygenase (RUBISCO), decreased in response to nitrate and iron starvation but not phosphate starvation. The changes in pigment content and fluorescence characteristics were typically reversed within 24 h of resupply of the limiting nutrient.