Document Detail

Effects of Anaerobiosis on Chlorophyll Fluorescence Yield in Spinach (Spinacia oleracea) Leaf Discs.
MedLine Citation:
PMID:  12231769     Owner:  NLM     Status:  Publisher    
When spinach (Spinacia oleracea) leaf discs were incubated in a dark anaerobic environment, the chlorophyll fluorescence yield was much increased relative to the aerobic control. Occasionally, the fluorescence yield of the darkened anaerobic samples approached 80% of the maximum fluorescence. The anaerobic incubation period also induced in a leaf disc the capacity to exhibit a low light-mediated chlorophyll fluorescence induction phenomenon. This involved a rapid and slow increase in fluorescence yield, followed by a slow quenching. This could be induced by light levels as low as 400 [mu]W m-2. The anaerobic-dependent increase in chlorophyll fluorescence yield could be relaxed by either far-red light, O2, or a saturating pulse of white light. It was concluded that the anaerobic-dependent increase in chlorophyll fluorescence yield was due to a dark reduction of the plastoquinone pool and its relaxation by reoxidation. Darkened isolated chloroplasts did not exhibit a fluorescence yield increase under anaerobic conditions. Fluorescence slowly increased only when dithiothreitol or dithionite was added.
G. C. Harris; U. Heber
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Publication Detail:
Journal Detail:
Title:  Plant physiology     Volume:  101     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  1993 Apr 
Date Detail:
Created Date:  2002-Sep-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1169-1173     Citation Subset:  -    
Biology Department, Wellesley College, Wellesley, Massachusetts 02181 (G.C.H.).
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