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Photoadaptation and the package effect in Dunaliella tertiolecta (Chlorophyceae)

Journal Article · · J. Phycol.; (United States)
; ; ;
In the marine unicellular chlorophyte, Dunaliella tertiolecta Butcher, the spectrally averaged in vivo absorption cross section, normalized to chlorophyll a (so-called a* values), vary two-fold in response to changes in growth irradiance. The authors used a kinetic approach to examine the specific factors which account for these changes in optical properties as cells photoadapt. Using Triton X-100 to solubilize membranes, they were able to differentiate between package effects and pigmentation effects. Their analyses suggest that 43-49% of the variability in a* is due to changes in pigmentation, whereas 51-57% is due to the package effect. Further analyses revealed that changes in cell size did not significantly affect packaging, while thylakoid stacking and the transparency of thylakoid membranes were important factors. Their results suggest that thylakoid membrane protein/lipid ratios change during photoadaptation, and these changes influence the effective rate of light harvesting per unit chlorophyll a.
Research Organization:
Bar Ilan Univ., Ramat Gan (Israel)
OSTI ID:
6082847
Journal Information:
J. Phycol.; (United States), Journal Name: J. Phycol.; (United States) Vol. 25:1; ISSN JPYLA
Country of Publication:
United States
Language:
English

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Related Subjects

520100* -- Environment
Aquatic-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
550500 -- Metabolism
59 BASIC BIOLOGICAL SCIENCES
ALGAE
AQUATIC ORGANISMS
BIOLOGICAL ADAPTATION
BIOLOGICAL EFFECTS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLOROPHYLL
ELECTROMAGNETIC RADIATION
GROWTH
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LIPIDS
MEMBRANE PROTEINS
MEMBRANES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHOTOSYNTHETIC MEMBRANES
PHYTOCHROMES
PHYTOPLANKTON
PIGMENTS
PLANKTON
PLANTS
PORPHYRINS
PROTEINS
QUANTITY RATIO
RADIATIONS
SYNTHESIS
VISIBLE RADIATION