Several studies have demonstrated that mycorrhizal networks can transport carbon,[4][5] phosphorus,[6] nitrogen,[7][8] water,[6][9] defense compounds,[10] and allelochemicals [11][12] from plant to plant. The flux of nutrients and water through hyphal networks has been proposed to be driven by a source–sink model,[1] where plants growing under conditions of relatively high resource availability (e.g., high-light or high-nitrogen environments) transfer carbon or nutrients to plants located in less favorable conditions. A common example is the transfer of carbon from plants with leaves located in high-light conditions in the forest canopy, to plants located in the shaded understory where light availability limits photosynthesis.