Abstract
ing to only 13% of total Cyt 6-559 in spinach chloroplasts, is analyzed with the help of a highly selective, computercontrolled spectrophotometer, which simultaneously applies 16 pulse modulated narrow band measuring beams with wavelengths in the cytochrome a-band (500-600 nm) for recordings of time resolved difference spectra. This Cyt 6-559 fraction remains oxidized upon dark incubation with ascorbate and is reduced upon illumination. It can be reduced by cyclic PSI in an antimycin A-sensitive reaction or in the course of antimycin A-insensitive linear electron transport via the Cyt b6/f complex. Reduction by NADPH in the dark requires ferredoxin. Simultaneous recordings of Cyt 6-563 and Cyt/ reveal close kinetic connection between this Cyt 6-559 fraction and the low potential chain of the Cyt 6 6 // complex. These results confirm and extend previous observations of Miyake et al. 1995 (Plant Cell Physiol. 36: 743) in maize mesophyll thylakoids, which led to the hypothesis that Cyt 6-559 (Fd) occupies the position of the postulated ferredoxin-plastoquinone reductase (FQR) in cyclic electron transport.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
