Chlororespiration: An adaptation to nitrogen deficiency in Chlamydomonas reinhardtii

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Proceedings of the National Academy of Sciences of the United States of America; (United States)

DOI:https://doi.org/10.1073/pnas.88.11.4791· OSTI ID:5976389

Peltier, G; Schmidt, G W ^[1]

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1. Univ. of Georgia, Athens (United States)

When grown under nitrogen limitation, pronounced chlororespiratory activity develops together with an altered composition of thylakoid membranes in Chlamydomonas reinhardtii. Relative to control cultures, the flash-inhibited, chlororespiration-dependent O{sub 2} consumption signal increases 10-fold. Also augmented is the light-sensitive respiratory activity responsible of the Kok effect, reflecting competitive inhibition of chlororespiratory electron transport by photosystem I. Fluoresscence measurements show that the thylakoid plastoquinone pool is extensively reduced in dark-adapted, N-limited cells. Thylakoids of N-limited cells have reduced amounts of cytochrome b{sub 6}, cytochrome f, and light-harvesting complexes. However, thylakoid-bound NADH-PQ oxidoreductase, with major subunits of 51 kDa and 17 kDa, is increased 7-fold and two novel cytochromes of 34 and 12.5 kDa are highly abundant. Thus, components of photosynthetic and chlororespiratory electron transport pathways are differentially regulated by N availability.

• DOE Contract Number: FG09-84ER13188
• OSTI ID: 5976389
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America; (United States), Vol. 88:11; ISSN 0027-8424
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
CHLAMYDOMONAS
PHOTOSYNTHESIS
CHLOROPLASTS
RESPIRATION
OXIDOREDUCTASES
ENZYME ACTIVITY
CYTOCHROME OXIDASE
ELECTRON TRANSFER
FLUORESCENCE
NITROGEN
NUTRITIONAL DEFICIENCY
THYLAKOID MEMBRANE PROTEINS
ALGAE
CELL CONSTITUENTS
CHEMICAL REACTIONS
CHLOROPHYCOTA
ELEMENTS
ENZYMES
HAEM DEHYDROGENASES
LUMINESCENCE
MEMBRANE PROTEINS
MICROORGANISMS
NONMETALS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
PROTEINS
SYNTHESIS
UNICELLULAR ALGAE
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)