NDLI: Effects of severe CO2 starvation on the photosynthetic electron transport chain in tobacco plants

Content Provider	Springer Nature Link
Author	Durchan, Milan Vácha, František Krieger Liszkay, Anja
Copyright Year	2001
Abstract	Tobacco plants (Nicotiana tabacum) were kept in CO$_{2}$ free air for several days to investigate the effect of lack of electron acceptors on the photosynthetic electron transport chain. CO$_{2}$ starvation resulted in a dramatic decrease in photosynthetic activity. Measurements of the electron transport activity in thylakoid membranes showed that a loss of Photosystem II activity was mainly responsible for the observed decrease in photosynthetic activity. In the absence of CO$_{2}$ the plastoquinone pool and the acceptor side of Photosystem I were highly reduced in the dark as shown by far-red light effects on chlorophyll fluorescence and P700 absorption measurements. Reduction of the oxygen content of the CO$_{2}$ free air retarded photoinhibitory loss of photosynthetic activity and pigment degradation. Electron flow to oxygen seemed not to be able to counteract the stress induced by severe CO$_{2}$ starvation. The data are discussed in terms of a donation of reducing equivalents from mitochondria to chloroplasts and a reduction of the plastoquinone pool via the NAD(P)H-plastoquinone oxidoreductase during CO$_{2}$ starvation.
Starting Page	203
Ending Page	213
Page Count	11
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	68
Issue Number	3
e-ISSN	15735079
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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