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Activities of Noncyclic and Alternative Pathways of Photosynthetic Electron Transport in Leaves of Broad Bean Plants Grown at Various Light Irradiances

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Russian Journal of Plant Physiology : Volume 52, Issue 3, May 2005

Russian Journal of Plant Physiology : Volume 52, Issue 2, March 2005

Russian Journal of Plant Physiology : Volume 52, Issue 1, January 2005

Russian Journal of Plant Physiology : Volume 51

Russian Journal of Plant Physiology : Volume 50

Russian Journal of Plant Physiology : Volume 49

Russian Journal of Plant Physiology : Volume 48

Russian Journal of Plant Physiology : Volume 47

Activities of Noncyclic and Alternative Pathways of Photosynthetic Electron Transport in Leaves of Broad Bean Plants Grown at Various Light Irradiances

Content Provider	Springer Nature Link
Author	Nikolaeva, M. K. Bukhov, N. G. Egorova, E. A.
Copyright Year	2005
Abstract	Activities of noncyclic and alternative pathways of photosynthetic electron transport were studied in intact leaves of broad been (Vicia faba L.) seedlings grown under white light at irradiances of 176, 36, and 18 µmol quanta/(m$^{2}$ s). Electron flows were followed from light-induced absorbance changes at 830 nm related to redox transformations of P700, the photoactive PSI pigment. The largest absorbance changes at 830 nm, induced by either white or far-red light, were observed in leaves of seedlings grown at irradiance of 176 µmol quanta/(m$^{2}$ s), which provides evidence for the highest concentration of PSI reaction centers per unit leaf area in these seedlings. When actinic white light of 1800 µmol quanta/(m$^{2}$ s) was turned on, the P700 oxidation proceeded most rapidly in leaves of seedlings grown at irradiance of 176 µmol quanta/(m$^{2}$ s). The rates of electron transfer from PSII to PSI were measured from the kinetics of dark P700$^{+}$ reduction after turning off white light. These rates were similar in leaves of all light treatments studied, and their characteristic reaction times were found to range from 9.2 to 9.5 ms. Four exponentially decaying components were resolved in the kinetics of dark P700$^{+}$ reduction after leaf exposure to far-red light. A minor but the fastest component of P700$^{+}$ reduction with a halftime of 30–60 ms was determined by electron transfer from PSII, while the three other slow components were related to the operation of alternative electron transport pathways. Their halftimes and relative magnitudes were almost independent on irradiance during plant cultivation. It is concluded that irradiance during plant growth affects the absolute content of PSI reaction centers in leaves but did not influence the rates of noncyclic and alternative electron transport.
Starting Page	427
Ending Page	433
Page Count	7
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	52
Issue Number	4
e-ISSN	16083407
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2005-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vicia faba irradiance during plant growth photosynthetic electron transport Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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

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Activities of Noncyclic and Alternative Pathways of Photosynthetic Electron Transport in Leaves of Broad Bean Plants Grown at Various Light Irradiances

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