Abstract
It is well known that blue and red light can open stomatas through the osmotic regulation. In the previous study, we have found that in guard cells the cortical microtubules were organized as radial arrays during daytime, suggesting their role in the stomatal opening. However, it was not clear which light induced the cortical microtubular organization. Then, we examined the relationship between the cortical microtubular organization and the stomatal aperture under the blue or red-light condition in Vicia Fava L.. As a result, both the blue and red lights could organize the cortical microtubules, the stomatal aperture was higher under the blue light. Furthermore, using Arabidopsis plants stably expressing GFP-tubulin fusion protein, we found that the blue light induce the radial array more clearly.
These results suggest the blue light regulation of stomatal opening through the organization of cortical microtubules.
