Development of photosynthetic activity in Porphyridium purpureum (Rhodophyta) following nitrogen starvation
- Smithsonian Institution, Washington, DC (USA)
The effects of nitrogen limitation on laboratory cultures of Porphyridium purpureum Bory, Drew and Ross were studied under continuous white light illumination (35 {mu}E {times} m{sup {minus}2} {times} s{sup {minus}1}). Growth ceased, respiration exceeded photosynthesis, chlorophyll content was reduced by 80%, and phycoerythrin content was reduced by 99% over a period of 14 days under nitrogen limitation. Recovery upon addition of nitrogen resulted in increased phycobiliprotein content, appearance of phycobilisomes attached to the thylakoids, increased oxygen evolution, and increased fluorescence emission from photosystem 1 (720 nm) and photosystem 2 (685 nm) upon excitation by green light. Growth resumes after 72 h and was concomitant with an increase of chlorophyll, phycoerythrin and phycobilisomes per thylakoid area. The results suggest that photosystem 1 was less affected by nitrogen starvation than photosystem 2 and that the recovery was largely dependent on the restoration of phycobilisomes and other photosystem components.
- DOE Contract Number:
- FG05-87ER13652
- OSTI ID:
- 6613590
- Journal Information:
- Journal of Phycology; (USA), Vol. 26:1; ISSN 0022-3646
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALGAE
PHOTOSYNTHESIS
NITROGEN
BIOLOGICAL EFFECTS
CHLOROPHYLL
NUTRITIONAL DEFICIENCY
PHOTOSYNTHETIC REACTION CENTERS
PHYCOBILINS
PHYCOBILISOMES
CARBOXYLIC ACIDS
CELL CONSTITUENTS
CHEMICAL REACTIONS
ELEMENTS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
PROTEINS
SYNTHESIS
560300* - Chemicals Metabolism & Toxicology