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. 1977 May;59(5):948–952. doi: 10.1104/pp.59.5.948

Blue light-induced Absorbance Changes in Membrane Fractions from Corn and Neurospora1,2

Robert D Brain a, John A Freeberg a,3, Charles V Weiss a,4, Winslow R Briggs a
PMCID: PMC543332  PMID: 16659974

Abstract

Blue light-induced absorbance changes were measured from differentially centrifuged membrane fractions from dark-grown coleoptiles of Zea mays L., and mycelia from an albino mutant of Neurospora crassa. Actinic irradiation caused changes in absorbance consistent with a flavinmediated reduction of a b-type cytochrome. Both corn and Neurospora showed similar light-minus-dark difference spectra, dose response curves, and kinetics of dark recovery after irradiation. The photoreducible cytochrome system from Neurospora showed the same distribution as the activity of a sodium-stimulated adenosine triphosphatase, thought to be a plasma membrane marker, in differential centrifugation experiments. The fraction showing the absorbance change did not co-sediment with the mitochondria, nor with the endoplasmic reticulum. Comparison of absorption spectra of fully oxidized, partially reduced, and fully reduced preparations showed that approximately a 30% reduction of the cytochromes involved with the process was needed to obtain the light-induced absorbance changes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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