Effects of continuous-background irradiance on xenon-flash-induced fluorescence yields in marine microalgae

Conference · Sat Jan 01 00:00:00 EST 1983

OSTI ID:5821816

Falkowski, P G; Wyman, K; Mauzerall, D

The well established inverse relationship between photosynthesis and fluorescence yield has been interpreted in the context of a model of photosynthesis in which fluorescence, photochemistry, and non-radiative decay all compete for excitation energy in the antenna chlorophyll of PS II traps by first-order rate processes. When all PS II traps are open, the yield of photochemistry is maximal while that of fluorescence is minimal (F/sub 0/); and when reaction centers are closed, the yield of photochemistry is minimal while fluorescence yields become maximal (F/sub M/). By measuring the fluorescence yields of saturating actinic flashes followed by weak probe flashes, we inferred both turnover times and cross-sections of PS II traps in a marine diatom with and without continuous background irradiance. Our results suggest that the delayed double-flash technique can be used to estimate photosynthetic electron flow under steady-state irradiance levels. 8 references.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5821816
• Report Number(s): BNL-33561; CONF-8308110-3; ON: DE83017584
• Resource Relation: Conference: 6. international congress on photosynthesis, Brussels, Belgium, 1 Aug 1983
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
DIATOMS
PHOTOSYNTHESIS
ELECTRON TRANSFER
PHOTOSYNTHETIC REACTION CENTERS
BIOCHEMICAL REACTION KINETICS
FLUORESCENCE
ALGAE
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLOROPHYLL
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
LUMINESCENCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
REACTION KINETICS
SYNTHESIS
550500* - Metabolism