Question
Which of the following inhibits O2 release in light phase?
Zeatin
PMA
DCMU
None of these
Solution
C.
DCMU
DCMU is a very specific and sensitive inhibitor of photosynthesis (photosynthetic inhibitors). It blocks the plastoquinone binding site of photosystem II, disallowing the electron flow from photosystem II to plastoquinone. Thus, it inhibits Hill reaction, by inhibiting release of O2.
