Activation of Chlororespiration Increases Chlorophyll Fluorescence Yield in Chlorella Adapted to Darkness at High Temperature

A tenfold increase in chlororespiration during dark incubation of Chlorella perynoidosa Chick CALU-175 at high temperature doubled the initial chlorophyll fluorescence yield (F sub(0)). The presence of iodacetamide or unmetabolizable glucose analog 2-deoxy-D-glucose prevented increase in both chloro...

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Bibliographic Details
Published in:Biology bulletin of the Russian Academy of Sciences 2004-03, Vol.31 (2), p.143-150
Main Authors: Chemeris, Yu. K., Shenderova, L. V., Venediktov, P. S., Rubin, A. B.
Format: Article
Language:English
Subjects:
Chlorella
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Summary:A tenfold increase in chlororespiration during dark incubation of Chlorella perynoidosa Chick CALU-175 at high temperature doubled the initial chlorophyll fluorescence yield (F sub(0)). The presence of iodacetamide or unmetabolizable glucose analog 2-deoxy-D-glucose prevented increase in both chlororespiration and F sub(0) yield. The rates of chlororespiration and F sub(0) yield growth demonstrated a similar pattern of temperature dependence. Inhibition of electron transport between Q sub(A) and plastoquinone with diuron prevented increase in F sub(0) during dark incubation of the cells at high temperature. Apparently, a pool of plastoquinone was restored in the chlororespiratory chain during the dark incubation at 37.5-41 degree C, and plastoquinone exchanged electrons with Q sub(A). This is the cause of Q sub(A) reduction and subsequent increase in F sub(0) yield.
ISSN:1062-3590
DOI:10.1023/B:BIBU.0000022469.13610.d7