[Activation of the chloroplast respiration increases chlorophyll fluorescence yield in Chlorella adapted to darkness at higher temperature].
A tenfold increase in chlororespiration during dark incubation of Chlorella perynoidosa Chick at high temperature doubled the initial chlorophyll fluorescence yield (F0). The presence of iodacetamide or unmetabolizable glucose analog 2-deoxy-D-glucose prevented increase in both chlororespiration and F0 yield. The rates of chlororespiration and F0 yield growth demonstrated a similar pattern of temperature dependence. Inhibition of electron transport between QA and plastoquinone prevented increase in F0 during dark respiration 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 degrees C and plastoquinone exchanged electrons with QA. This is the cause of QA reduction and subsequent increase in F0 yield.
Chemeris
Iu K
IuK
Biological Faculty, Moscow State University, Vorob'evy gory, Moscow, 119899 Russia.
Shenderova
L V
LV
Venediktov
P S
PS
Rubin
A B
AB
D000222:Adaptation, Physiological / Q000502:physiology*; D002708:Chlorella / Q000187:drug effects / Q000502:physiology*; D002734:Chlorophyll / Q000737:chemistry / Q000378:metabolism*; D002736:Chloroplasts / Q000187:drug effects / Q000378:metabolism*; D003624:Darkness; D003847:Deoxyglucose / Q000494:pharmacology; D005453:Fluorescence; D007460:Iodoacetamide / Q000494:pharmacology; D010971:Plastoquinone / Q000378:metabolism; D013696:Temperature
D002734:Chlorophyll; D003847:Deoxyglucose; D010971:Plastoquinone; D007460:Iodoacetamide