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pubmed-article:16662607pubmed:dateCreated2010-6-29lld:pubmed
pubmed-article:16662607pubmed:abstractTextChloroplasts isolated from seedlings of a virescens mutant of barley (Hordeum vulgare L cv Gateway) grown for 6 days under continuous illumination had lower levels of photosystem II activities on a chlorophyll basis than wild-type seedlings. After 8 days, however, the photosystem II rates of the mutant and wild-type were approximately equal. Lower levels of the photosystem II activities in the mutant were correlated with a smaller functional plastoquinone pool size as determined by room temperature fluorescence induction. Higher levels of extractable plastoquinone A on a chlorophyll basis, however, were obtained from mutant chloroplasts. An increased room temperature fluorescence yield in the mutant was shown to be due to a higher level of initial fluorescence. A decreased sigmoidicity in the room temperature fluorescence induction transient in the presence of diuron and an increased 77 K fluorescence emission at 680 nanometers lead us to believe that a certain population of the light harvesting chlorophyll protein complex in the mutant membranes is unconnected to photo-system II reaction centers. Although photochemical activities of the mutant approach wild-type values as the mutant develops, the population of dissociated light harvesting complexes does not appear to change.lld:pubmed
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pubmed-article:16662607pubmed:statusPubMed-not-MEDLINElld:pubmed
pubmed-article:16662607pubmed:monthOctlld:pubmed
pubmed-article:16662607pubmed:issn0032-0889lld:pubmed
pubmed-article:16662607pubmed:authorpubmed-author:ZalikSSlld:pubmed
pubmed-article:16662607pubmed:authorpubmed-author:KyleD JDJlld:pubmed
pubmed-article:16662607pubmed:issnTypePrintlld:pubmed
pubmed-article:16662607pubmed:volume70lld:pubmed
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pubmed-article:16662607pubmed:authorsCompleteYlld:pubmed
pubmed-article:16662607pubmed:pagination1026-31lld:pubmed
pubmed-article:16662607pubmed:dateRevised2010-9-14lld:pubmed
pubmed-article:16662607pubmed:year1982lld:pubmed
pubmed-article:16662607pubmed:articleTitlePhotosystem II Activity, Plastoquinone A Levels, and Fluorescence Characterization of a Virescens Mutant of Barley.lld:pubmed
pubmed-article:16662607pubmed:affiliationDepartment of Plant Sciences, University of Alberta, Edmonton, Alberta T6G 2E3 Canada.lld:pubmed
pubmed-article:16662607pubmed:publicationTypeJournal Articlelld:pubmed
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