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What happens to water during photosynthesis?

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What happens to water during photosynthesis?

Postby Chrissy » Thu May 24, 2007 9:51 pm

What happens to water during photosynthesis? Where in the chloroplast does this occur?
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the characteristic of photosynthesis

Postby Tae Jun, Yoon » Fri May 25, 2007 8:38 am

What happens to water during photosynthesis? Where in the chloroplast does this occur?

The entire chemical formula of photosynthesis is this
: 6CO2 + 12H2O -> C6H12O6 + 6O2 + 6H2O
You can see that the coefficient of water decreased after the reaction occur. Decreasing of the water occurs in thylakoid. This reaction is called "photolysis" : During photolysis, twelve mol of water is decomposed to oxygen, two protons, and electrons. the electrons are used to synthesize ATP and NADPH2
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Re: What happens to water during photosynthesis?

Postby satrohraj » Sun May 27, 2007 7:13 am

Chrissy wrote:What happens to water during photosynthesis? Where in the chloroplast does this occur?


To be particular, water marks the beginning of photosynthesis.
One Molecule water breaks into Hydrogen and Oxygen Ions; and supplies 2H+ and 2e to PS II; via OEC (Oxygen Evolving Complex)

[ Equation: H2O ---> 2H+ + 1/2O2 + 2e ]

Thats the first step in photosynthesis.
And there is no more water in whole photosynthesis, I suppose :-)
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Postby wtwt5237 » Fri Jun 01, 2007 7:21 am

no water is degradated, but water acts as carrying agents somewhere, if my memories don't get it wrong.
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Postby MrMistery » Fri Jun 01, 2007 8:12 pm

water is split into 2 hydrogen ions, 2 electrons and an oxygen atom that quickly combines with another oxygen atom to form molecular oxygen. This occurs at the beginning of the light reaction of photosynthesis.
This is actually a very important thing, because it produces molecular oxygen, which can then be used for cellular respiration by other organisms or the plant itself.
Where does it take place? Well, the only molecule in nature that can oxidise water is P680, the reaction center of photosystem II. The actual photolysis occurs on the thylacoid lumen side of the thylacoid membrane, in a complex protein machine that contains Cloride, fittingly named water splitting complex.
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Postby daniel.kurz » Sat Jun 02, 2007 1:35 am

This process is done to replace the ions loss in photosystem II. Those are the ones in the chloroplasts. The electrons are excited by photons from the sun and then those electrons are used later in photosystem I. If the water did not replace the ions loss by photosystem II the leaf would quickly die.
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