Halford Dace (daceh at shrike.und.ac.za) wrote:
: General quer: I have recently been doing some reading about chloroplast
antioxidant
so have i
: Can anybody enlighten me on the mechanism of Qe? I'd really appreciate
either
: an explanation or a pointer to some reference.
try van Wijk and Krause, Planta 189: 359-368 (1993) the gist of which is
that electron donation to PSII is inhibited by acidic conditions in the
lumen, reducing the reduction of PSII which otherwise would lead to the
formation of the reactive singlet oxygen
delta pH in the lumen is caused by a number of mechanisms, which can be
considered more or less photosynthetic: water-splitting by
the OEC, cyclic electron transport, and linear electron transport, where the
electron acceptors can be NADP+, oxygen, nitrite, sulfate and thioredoxin
i should point out that these are my interpretation of the available articles,
and thus stand to be corrected, if neccesary
by the way, i am a durbanite myself - will any of you from the U of N be
attending the PS congress in montpellier?
harry
