||Response of the Photosynthetic Apparatus of 'Phaeodactylum tricornutum' (Bacillariophyceae) to Nitrate, Phosphate, or Iron Starvation.
Geider, R. J. ;
La Roche, J. ;
Greene, R. M. ;
Olaizola, M. ;
||Delaware Univ., Lewes. Coll. of Marine Studies. ;Brookhaven National Lab., Upton, NY. Oceanographic and Atmospheric Sciences Div.;Environmental Research Lab., Narragansett, RI.
||EPA/600/J-94/506 ; ERLN-X219
Nutritional deficiencies ;
Photochemical reactions ;
Aquatic microorganisms ;
Phaeodactylum tricornutum ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||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.
||Pub. in Jnl. of Phycology, v29 p755-766 1993. Prepared in cooperation with Brookhaven National Lab., Upton, NY. Oceanographic and Atmospheric Sciences Div. Sponsored by Environmental Research Lab., Narragansett, RI.
|NTIS Title Notes
||Reprint: Response of the Photosynthetic Apparatus of 'Phaeodactylum tricornutum' (Bacillariophyceae) to Nitrate, Phosphate, or Iron Starvation.
||PC A03/MF A01