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Plastoquinone
Plastoquinone
(
PQ
) is a
quinone
molecule involved in the electron transport chain in the
light-dependent reactions
of
photosynthesis
. Plastoquinone is reduced when it accepts two electrons from
photosystem II
and two hydrogen cations (H
+
) from the stromal matrix of the chloroplast), thereby forming
plastoquinol
. It transports the protons into the lumen of
thylakoid discs
, while the electrons continue further along the
electron transport chain
, into the
cytochrome b
6
f
protein complex.
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