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Ruby Metzner I would say photosynthesis occurs in all green cells. If the leaf primordia is green, it is most probable that there is photosynthesis in the chloroplast there too. Here is a nice article which you can read and understand. Article Gain and Loss of Photosynthetic Membranes during Plastid Dif...

An interesting question, and I a'm looking for answers from peers.

I'm highly interested in understanding switching on/off of photosynthesis; here is an article where used combined approach to understand switching on of photosynthesis in an Antarctica lichen.

Article A correlative approach, combining chlorophyll a fluorescence...