Pathways of water flow in mycorrhizal plants

Pathways of water flow in mycorrhizal plants

Pathways of water flow in mycorrhizal plants

Arbuscular mycorrhizal (AM) symbiosis regulates root hydraulic properties, but it is not clear whether this involves the cell-to-cell or the apoplastic pathway. Bárzana et al. show that roots of AM plants of maize and tomato enhance the relative apoplastic water flow as compared to non-AM plants, and that this increase is significant both under well-watered and drought-stress conditions. The presence of the AM fungus in the roots of the host plants could modulate switching between apoplastic and cell-to-cell water transport pathways, which may allow a greater flexibility in the response of the plants to water shortage.