Kallisto
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#1
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Hello!

I have some difficulties with the metabolism of ferns. Here are some clues:

- the ferns are able to intake carbon dioxide by the roots.
- ferns have no stomata!
- ferns store carbon dioxide at night.

First I thought that it has to be CAM photosynthesis, but by this metabolism stomata are involved. That is not the case. So I wonder what it could be. A variation of CAM photosynthesis by any chance? I appreciate helpful answers. Thanks in advance!
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Mockery
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(Original post by Kallisto)
Hello!

I have some difficulties with the metabolism of ferns. Here are some clues:

- the ferns are able to intake carbon dioxide by the roots.
- ferns have no stomata!
- ferns store carbon dioxide at night.

First I thought that it has to be CAM photosynthesis, but by this metabolism stomata are involved. That is not the case. So I wonder what it could be. A variation of CAM photosynthesis by any chance? I appreciate helpful answers. Thanks in advance!
From my preliminary understanding Ferns do have stomata.

Maybe want to recheck this first?
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Kallisto
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(Original post by Mockery)
From my preliminary understanding Ferns do have stomata.

Maybe want to recheck this first?

I have just rehecked the metabolism and it is written that Ferms do not have stomata. So I assume that these plants don't get carbon dioxide by the leaves. It is written too that they do it by the roots and this metabolism is similar to a known physiological optimisation...

That's why I still believe in CAM photosynthesis. Its very likely in my opinion.
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Mockery
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(Original post by Kallisto)
I have just rehecked the metabolism and it is written that Ferms do not have stomata. So I assume that these plants don't get carbon dioxide by the leaves. It is written too that they do it by the roots and this metabolism is similar to a known physiological optimisation...

That's why I still believe in CAM photosynthesis. Its very likely in my opinion.
What is your source for this, where does it say it?
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Kallisto
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(Original post by Mockery)
What is your source for this, where does it say it?
This is written in the task. The task quoted a journal in turn where this mechanisms of ferns were claimed. Unfortunately the task doesn't give a source. Sorry!
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Dynamo123
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(Original post by Kallisto)
This is written in the task. The task quoted a journal in turn where this mechanisms of ferns were claimed. Unfortunately the task doesn't give a source. Sorry!
Well, ferns do have stomata. The functional properties of the stomata may vary, but they are definitely present. Check this:
http://www.plantphysiol.org/content/147/2/922.full

I can't help you with metabolism of ferns, since I don't think my plant biology is that good. You can take it on from here, though.
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Kallisto
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(Original post by Dynamo123)
Well, ferns do have stomata. The functional properties of the stomata may vary, but they are definitely present. Check this:
http://www.plantphysiol.org/content/147/2/922.full

I can't help you with metabolism of ferns, since I don't think my plant biology is that good. You can take it on from here, though.
Never mind! I'm quite sure that the metabolism is CAM photosynthesis. I don't know how the intake of carbon dioxide by the roof works, as the plants are taken the carbon dioxide in the air by stomata as a rule. But I think the reason why these ferns have no stomata is to prevent transpiration at places with a warm climate. Nevertheless I wonder how these ferns are able to intake carbon dioxide. As far as I know carbon dioxide just exists in the air. Or am I wrong?
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