Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 72:1119-1122 (1983)
© 1983 American Society of Plant Biologists

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Articles

State 1-State 2 Transitions in a Unicellular Green Algae 1

Analysis of In Vivo Chlorophyll Fluorescence Induction Curves in the Presence of 3-(3,4-Dichlorophenyl)-1, 1-dimethylurea (DCMU)

Michael Hodges2 and James Barber

Agricultural Research Council Photosynthesis Research Group, Department of Pure and Applied Biology, Imperial College, London SW7 2BB England

A study has been made on the State 1-State 2 transitions exhibited by the unicellular green algae Chlorella pyrenoidosa. Chlorophyll fluorescence induction curves from algae adapted to State 1 or State 2 have been analyzed and a comparison made with similar curves produced by decreasing the intensity of light going to the photosystem II reaction centers. In both cases, quenching of the maximum fluorescence yield (Fm) and the initial fluorescence yield (Fo) were observed so that the Fv/Fm ratio and the area above the induction curve (Amax) remained constant. The State 1-State 2 transition also produced changes in the {beta}max component indicative of some alteration within photosystem II organization. The implications of these experiments on the in vivo mechanism for energy redistribution between the two photosystems are discussed in terms of changes in absorption cross-section rather than being due to spillover from photosystem II to photosystem I. These changes may reflect the phosphorylation of the light-harvesting chlorophyll a/b protein complex and its subsequent migration away from the photosystem II core leading to its closer association with photosystem I.

2 Supported on a SERC-CASE scholarship.

1 Supported by the Agricultural Research Council (to J. B.).






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