Dual effect of dibromothymoquinone (DBMIB), inhibitor and reducing agent at the donor side of Photosystem I, was investigated in isolated intact chloroplasts by flash-induced absorbance changes at 820 and 515 nm. We show that in the absence of other electron donors, rereduction of P700+ by DBMIB proceeds at a very low rate (half-time of ∼10 s) Dual effect of DBMIB explains that the initial rise of electrochromic absorbance change induced by repetitive flashes is usually not diminished while the slow rise is fully inhibited by this compound.
|Number of pages||5|
|Journal||Biochemical and biophysical research communications|
|Publication status||Published - May 16 1984|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology