I'm currently working on how plants can find carbon sources for their metabolism, except from photosynthesis.

I found cases of mycoheterotrophic nutrition in non-chlorophylic plants and orchids, where plants build a parasitic relashionship with mycorrhizal fungi. Could other plants, like the cultivated ones, or trees, use mycorrizal nets for carbon nutrition from time to time, even when they could realize photosynthesis ? In other words, is non-clorophylic plants way of surviving a new function they developp, or is it a "natural" way of doing for every plant that they push to the extreme ?

Another case is the one of Quercus ilex, that would establish a temporary mycoheterotrophic nutrition, in spring when the root stocks are depleted and the leaves are not grown yet. Is there any study about it ?

I've already red the work of Garbaye J. 2013. La symbiose mycorhizienne. Une association entre les plantes et les champignons. éd. Quae. pp 70-88, 102-105. and work of Marc-André Sélosse.

Thanks for your answers.