Biochemical and Biophysical Research Communications 1993-08-16

Involvement of acceptor side components of PSII in the regulatory mechanism of Plectonema boryanum grown photoautotrophically under diazotrophic condition.

H S Misra, T S Desai

Index: Biochem. Biophys. Res. Commun. 194(3) , 1001-7, (1993)

Full Text: HTML

Abstract

Alternating peaks of photosynthetic activity (P-phase) and nitrogen fixing activity (N-phase) were shown in Plectonema boryanum grown under diazotrophic condition in continuous light. In N-phase photosystem I activity increased by 35-45% and oxygen evolution decreased by 70-80% which was partially restored to 45-55% in the presence of 2,6-dichloro-p-benzoquinone. Thermoluminescence glow curve in P-phase consists of a major band at 25 degrees C which was shifted to 10 degrees C in N-phase. Both these bands are sensitive to DCMU and tetranitromethane. Flash excitation studies with major thermoluminescence band in P and N-phase showed oscillations with same periodicity of four having maxima at 2nd and 6th flashes. On the basis of these observations it is suggested that photosynthetic electron transport under diazotrophic growth condition is regulated by the redox levels of the secondary quinone acceptor QB.

Related Compounds

  • 2,6-DICHLORO-1...

Related Articles:

Metal-independent decomposition of hydroperoxides by halogenated quinones: detection and identification of a quinone ketoxy radical.

2009-07-14

[Proc. Natl. Acad. Sci. U. S. A. 106(28) , 11466-71, (2009)]

Removal of halo-benzoquinone (emerging disinfection by-product) precursor material from three surface waters using coagulation.

2013-04-01

[Water Res. 47(5) , 1773-82, (2013)]

Microbial anaerobic demethylation and dechlorination of chlorinated hydroquinone metabolites synthesized by basidiomycete fungi.

2004-01-01

[Appl. Environ. Microbiol. 70(1) , 385-92, (2004)]

Interaction of exogenous quinones with membranes of higher plant chloroplasts: modulation of quinone capacities as photochemical and non-photochemical quenchers of energy in Photosystem II during light-dark transitions.

2003-06-05

[Biochim. Biophys. Acta 1604(2) , 115-23, (2003)]

Substrate water exchange in photosystem II core complexes of the extremophilic red alga Cyanidioschyzon merolae.

2014-08-01

[Biochim. Biophys. Acta 1837(8) , 1257-62, (2014)]

More Articles...