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Figure 1: Staining of NTT transporter (blue on left) and starch granules (yellow on right) in GCs
.
Source: The University of Hong Kong
Whether guard cells (GCs) perform photosynthesis has been debated for decades
.
Earlier studies showed that guard cell chloroplasts (GCCs) cannot fix carbon dioxide, but later studies have suggested otherwise
In the morning, sunlight causes the stomata in the leaves of the plant to open
.
This lets carbon dioxide in and oxygen out, boosting photosynthesis
Dr.
Boon Leong Lim's research group at the University of Hong Kong used a plant fluorescent protein sensor to observe the production of ATP and NADPH in real time in the mesophyll cells and chloroplasts of the simulated plant Arabidopsis thaliana
.
"However, under light conditions, we were not able to detect any ATP or NADPH production in GCCs.
In a joint effort, the team showed that, unlike mesophyll cells (MCs), GCs are very inactive in photosynthesis
.
Sugars synthesized and provided by MCs are imported into GCs and consumed by mitochondria to generate ATP required for stomatal opening
"I was very excited when Dr.
Lim contacted me to collaborate on this project," said Dr.
Diana Santelia
.
"We have been trying to clarify these fundamental questions with a molecular genetic approach
Research papers are available here:
https://
Research project video: https:// title
Arabidopsis guard cell chloroplasts import cytosolic ATP for starch turnover and stomatal opening
