Photoinhibition in vivo of Photosystem II reactions during development of the photosystems of wheat seedlings

Photoinhibition in vivo of Photosystem II reactions during development of the photosystems of wheat seedlings

Photoinhibition of O2 evolution and reactions leading to millisecond-delayed light emission (ms-DLE) of chlorophyll by illumination of leaves with excess white light were investigated in wheat seedlings greened for different times in a special chamber with constant conditions (20 degrees C; CO2 and...

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Bibliographic Details
Published in:Photosynthesis research Vol. 84; no. 1-3; pp. 9 - 14
Main Authors: Mahmudov, Z.M, Abdullayev, K.D, Gasanov, R.A
Format: Journal Article
Language:English
Published: Netherlands 01-06-2005
Subjects:
Chlorophyll - metabolism
durum wheat
Light
light intensity
Oxygen - metabolism
oxygen evolution
oxygen evolving complex
photoinhibition
photosystem II
Photosystem II Protein Complex - metabolism
Photosystem II Protein Complex - radiation effects
plant development
seedlings
Seedlings - growth & development
Seedlings - metabolism
Seedlings - radiation effects
Thylakoids - metabolism
Time Factors
Triticum - growth & development
Triticum - metabolism
Triticum - radiation effects
Triticum turgidum subsp. durum
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Summary:Photoinhibition of O2 evolution and reactions leading to millisecond-delayed light emission (ms-DLE) of chlorophyll by illumination of leaves with excess white light were investigated in wheat seedlings greened for different times in a special chamber with constant conditions (20 degrees C; CO2 and humidity). A sharp reduction in initial and steady state rates of O2 evolution and in the intensity of different components of ms-DLE under excess light on the stage of lag-phase of chlorophyll biosynthesis (4-6h of greening) were observed. An increasing stability of the oxygen-evolving process and ms-DLE of chlorophyll during formation of the thylakoid membrane photosystems (12-24 h of greening) was shown. Rifampicin did not influence the stability of oxygen evolution whereas cycloheximide led to the intensification of photoinhibition of the initial and steady-state rates of oxygen evolution under the inhibitory light action. The early stages of photosystems formation during short time of greening of etiolated seedlings were more sensitive to the action of inhibitory light, possibly due to a weak interaction of the oxygen-evolving system components and connection with reaction centers of Photosystem II.
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ISSN:0166-8595
1573-5079
DOI:10.1007/s11120-005-0897-5