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H2O comes out of PS?

Gary Hannan bio_hannan at ONLINE.EMICH.EDU
Fri Mar 10 13:48:36 EST 2000

Well, as long as folks are revealing photosynthetic ignorance, here is my

A balanced equation for photosynthesis show 2H2O going into PS (for each
CO2) and 1 H2O coming out (in addition to carbohydrate, etc.).  My question
is, what is the source of the H2O on the right side of the overall
equation?  I have looked in numerous plant phys and biochem books and I
have been unable to find it.  I know that ATP formation will generat H and
OH, but that does not apply here.  Is it the step from PGA to PGAL in the
Calvin Cycle??  Or is it shown in equations because it is required for
balancing things even though no one knows where it comes from?


Gary Hannan

Gary Hannan
bio_hannan at online.emich.edu
Biology Dept.
Eastern Michigan University
Ypsilanti, MI  48197
(734) 487-4399


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