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C3 and C4 plants

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C3 and C4 plants

Postby Specks13 » Wed Mar 16, 2005 6:59 pm

Can someone in simple terms please explain the difference between C3 and C4 plants? Thanks
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Postby protozoan » Wed Mar 16, 2005 7:42 pm

The difference is between enzymes which accept CO2 from the air. C3 plants use enzym ribulosodiphosphatcarboxylase while C4 and CAM plants use phosphoenolpyruvatcarboxylase to accept CO2 from the air. Also the primary product of photosynthesis of C3 plants is phosphoglycerat while in C4 plants it is oxalacetate The differences are also between structure of the photosynthetic apparat. I hope this helps, also hope you know what enzymes are.
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Postby MrMistery » Wed Mar 16, 2005 8:25 pm

The difference occurs in photosynthesis. From the point of view of the first subsance created, there are 3 types of plants: C3, C4 and CAM
As protozoan pointed out C3 plants use RuDP carboxylase to fix CO2 and the first organic molecule created is phosphoglycerat(this thing has 3 C atoms=> the name C3)
C4 plants use PEP carboxylase to fix CO2 and the first organic molecule is oxalacetic acid(4 C atoms, from which comes the name). At the C4 plants photosynthesis is 6 times faster than C3 plants
There is a third kind, the CAM plants. Would you like me to explaint those to u to?
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Thanks but...

Postby Specks13 » Wed Mar 16, 2005 9:31 pm

what would be an example of each type of plant? Is it as simple as saying a C4 plant requires less water than a C3 plant?
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Postby Poison » Wed Mar 16, 2005 10:09 pm

examples:
C3----->wheat, barley, potatoes and sugar beet. (most of the plants are C3)
C4----->fourwing saltbush, corn ,many of summer annual plants.
CAM---> cactuses,some orchids and bromeliads
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Postby MrMistery » Thu Mar 17, 2005 6:31 pm

From what i know, NO. None of my books states this
However, every serious book on the subject will tell you that CAM plants require less water. This is why they populate deserts and other such hostile environment. You can recognise a CAM plant because it has water in it's leaves and stem(like aloe vera)
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Postby thank.darwin » Wed Mar 23, 2005 11:52 pm

No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
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Postby Poison » Thu Mar 24, 2005 4:03 pm

CAM plants require less water. Not C3 or C4.
C4 plants use a reaction way called C4 way. This reaction is followed by C3 way. C4 way provides more CO2 to the C3 way.
C3 plants do not have C4 way.
CAM plants also use C3 and C4 ways. the difference is that the stomas of CAM plants are opened during night and CO2 is stored.

Hope this helped. :)
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Postby MrMistery » Fri Mar 25, 2005 8:32 pm

If i didn't know the process Poison, i wouldn't have understood a thing from what you said :D :D
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Postby Poison » Fri Mar 25, 2005 9:49 pm

But you know the process. So this is not a problem 4 u. Is it? :lol:
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Postby MrMistery » Sat Mar 26, 2005 10:59 am

Quite well, if i do say so myself :) :)
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Postby Inuyasha » Sun Mar 27, 2005 8:51 pm

C4 plants are like crabgrass the ones that grow when it tends to be hotter. C3 is like bluegrass. The differene depedns on their intake of CO2. C4 bypass the need to use CO2 therefore they do not have to open their stromatas to let in CO2 for photosyntheseis.
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