Origin of Multiphase Reduction of P700+ in Broad Bean Leaves after Irradiation with Far-Red Light

Origin of Multiphase Reduction of P700+ in Broad Bean Leaves after Irradiation with Far-Red Light The kinetic curves of dark reduction of P700+ (oxidized primary donor of PSI) after far-red light irradiation were studied on broad bean (Vicia faba L.) leaves treated with antimycin A, methyl viologen, or diuron. Four components of P700+ reduction were found in untreated leaves, namely, an ultrafast component with a half-time of 25 ms, and fast (210 ms), middle (790 ms), and slow (6100 ms) components. The fast component disappeared in leaves treated with antimycin A or methyl viologen. At the same time, these substances did not affect other components of P700+ reduction. Treatment of leaves with diuron abolished both the ultrafast and fast components of P700+ reduction. As the length of far-red light exposure was increased, a lag phase appeared in the development of middle component in leaves treated with diuron, antimycin A, or methyl viologen. In thus treated leaves, an exponential pattern of the middle component was displayed with a certain delay after darkening. A conclusion was drawn that the minor ultrafast component of P700+ dark reduction in broad bean leaves was caused by electron donation to PSI from PSII, whereas the fast component of this process was determined by the operation of ferredoxin-dependent electron transport around PSI. The middle and slow components were supposed to be related to electron input to PSI from reductants localized in the chloroplast stroma. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Origin of Multiphase Reduction of P700+ in Broad Bean Leaves after Irradiation with Far-Red Light

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Publisher
Springer Journals
Copyright
Copyright © 2005 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences; Plant Physiology
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1007/s11183-005-0064-z
Publisher site
See Article on Publisher Site

Abstract

The kinetic curves of dark reduction of P700+ (oxidized primary donor of PSI) after far-red light irradiation were studied on broad bean (Vicia faba L.) leaves treated with antimycin A, methyl viologen, or diuron. Four components of P700+ reduction were found in untreated leaves, namely, an ultrafast component with a half-time of 25 ms, and fast (210 ms), middle (790 ms), and slow (6100 ms) components. The fast component disappeared in leaves treated with antimycin A or methyl viologen. At the same time, these substances did not affect other components of P700+ reduction. Treatment of leaves with diuron abolished both the ultrafast and fast components of P700+ reduction. As the length of far-red light exposure was increased, a lag phase appeared in the development of middle component in leaves treated with diuron, antimycin A, or methyl viologen. In thus treated leaves, an exponential pattern of the middle component was displayed with a certain delay after darkening. A conclusion was drawn that the minor ultrafast component of P700+ dark reduction in broad bean leaves was caused by electron donation to PSI from PSII, whereas the fast component of this process was determined by the operation of ferredoxin-dependent electron transport around PSI. The middle and slow components were supposed to be related to electron input to PSI from reductants localized in the chloroplast stroma.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Aug 9, 2005

References

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