It has been reported that a guard cell in a C4 plant contains both PEPC and Rubisco. Do single guard cells in C4 plants actually perform full photosynthesis?
Hi Gaber,
I think, no because both PEPS and Rubisco are present in both types photosynthetic cells in C4 plants. What publication do you mean?
Best regards,
Hanna
AS YOU KNOW, THERE MUST BE SPATIAL SEPARATION BETWEEN PEPC AND RUBISCO FOR C4 PHOTOSYNTHESIS TO OCCUR. I AM UNAWARE OF PUBLISHED WORK ON STOMATAL PHOTOSYNTHESIS IN C4 OR CAM.
as I know both enzymes work in both types of cells: sheath cells and mesophyll cells, but the ratio of activity of these enzymes in a variety cells are different ....
Thank you Hanna and Muayed
This paper : http://jxb.oxfordjournals.org/content/52/358/1003.full.pdf
has detected Rubisco and PEPC in guard cells. PEPC is perhaps the housekeeping version and not the C4 specific but the point is if Rubiso exists and there is the substrate along with the decarboxylase enzyme, why not perform C4 photosynthesis, especially if another paper has reported that photosynthesis is essential for stomatal opening and that chlorophyll degradation by overexpression of a chlorophyllase leads to deflated stomata.
Dear Garber,
Many thanks for article! I was studied leaves from oilflax and I had similar situation. We found 2 types cells with 2 different chloroplasts which differ from each other in size - small and big...but we not find bunddle cells....
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