Nitrogen Systemic Signaling: From Symbiotic Nodulation to Root Acquisition

Plant nutrient acquisition is tightly regulated by resource availability and metabolic needs, implying the existence of communication between roots shoots to ensure their integration at whole-plant level. Here, we focus on systemic signaling pathways controlling nitrogen (N) nutrition, achieved both root import mineral N and, in legume plants, through atmospheric fixation symbiotic bacteria inside dedicated nodules. We explore features conserved repressing or enhancing regulation roots, as well with other environmental factors, such phosphate, light, CO2 availability.