Plant Question

[aquashark]

Plant Question

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Post by aquashark » Thu Apr 07, 2005 5:37 am

In general, if a plant is kept away from the light, what specifically will happen to the plant's Calvin cycle?

[Poison]

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Post by Poison » Thu Apr 07, 2005 4:34 pm

the plant wouldn't be able to do photosynthesis.

[blindcat35]

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Post by blindcat35 » Sat Feb 04, 2006 6:27 am

Photosynthesis include light and dark interaction >>> not light no dark !!!! if we put plant in drak along time >>> no atp, and chorophil sinthesis .... no energy for plant metabolism ......>>>> it will die

[MrMistery]

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Post by MrMistery » Sat Feb 04, 2006 5:00 pm

Not that simple... as usual... It will die eventually but depending on which type of plant it is. the plant will live longer if it a CAM plant(a pineapple tree, a cactus, any crasulacee) because they can do calvin cycle in the dark as long as there is enough abscisic acid and malic acid accumulated in their vacuoles. These plants normally do Calvin-Bensen cycle at night. For a C3 or C4 plant, this does not go and it will take only a very short time until the ATP and NADPH run out...

Regards,
Andrew

[bearhug]

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Post by bearhug » Sat Feb 04, 2006 5:32 pm

Just to clarify, the dark reaction does not mean that it occurs in the dark. It means that this part of photosynthesis does not use light energy in order to occur, unlike the light reaction.

[MrMistery]

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Post by MrMistery » Sat Feb 04, 2006 6:17 pm

Actually research shows that the dark reaction does not use light energy as power in order to occur. It does need energy in order to activate enzymes(not in CAM plants). However, this qill not be a problem, since you will run out of NADPH long before you run out of already-activated enzymes