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Populations of photosystem 1 units rapidly and slowly reduced by stromal reductants represent photosystem 1 alpha and photosystem 1 beta complexes: evidence from irradiance-response curves of P700 photooxidation in intact barley leaves



Populations of photosystem 1 units rapidly and slowly reduced by stromal reductants represent photosystem 1 alpha and photosystem 1 beta complexes: evidence from irradiance-response curves of P700 photooxidation in intact barley leaves



Photosynthetica 43(1): 147-151



Photon-induced absorbance changes at 830 nm ( Delta A<sub>830</sub>) related to redox transformations of P700, primary electron donor of photosystem 1 (PS1), were examined in barley leaves treated with diuron and methyl viologen. In such leaves, only soluble reductants localized in chloroplast stroma could serve as electron donors for P700+. Delta A<sub>830</sub> were induced by 1-min irradiation of leaves with "actinic light" (AL, 700+or-6 nm) of various irradiances.

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Accession: 004275363

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DOI: 10.1007/s11099-005-7151-4


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