The major phytotoxic compounds (encecalin, euparin and demethylencecalin) isolated from Helianthella quinquenervis (Hook) A Gray (Asteraceae) were evaluated on di β erent photosynthetic activities in chloroplasts isolated from spinach leaves. ATP synthesis, proton uptake and electron Γow (basal, phos
Influence of thylakoid protein phosphorylation on photosynthetic electron transport and photophosphorylation
β Scribed by Giorgio Forti; Paola M. G. Grubas
- Book ID
- 104627917
- Publisher
- Springer
- Year
- 1986
- Tongue
- English
- Weight
- 268 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0166-8595
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β¦ Synopsis
Data are reported which show that thylakoid protein phosphorylation decreases photosystem II fluorescence yield and enhances the photosystem I dependent photophosphorylation catalyzed by phenazinemethosulphate in the presence of DCMU. The stimulationis larger at low light intensity, but is still observed at high intensity. These observations are interpreted to demonstrate that thylakoid protein phosphorylation causes a transfer of excitation energy from PS II to PS I, but may also have an independent stimulatory effect on PSI dependent photophosphorylation.
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