Abstract:
: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 (F(m)) and the initial fluorescence yield (F(o)) were observed so that the F(v)/F(m) ratio and the area above the induction curve (A(max)) 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.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Hodges M,Barber Jdoi
10.1104/pp.72.4.1119subject
Has Abstractpub_date
1983-08-01 00:00:00pages
1119-22issue
4eissn
0032-0889issn
1532-2548journal_volume
72pub_type
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