Coordinated systemic regulation maintains plant nutrient homeostasis

Plant survival in fluctuating environments depends on the precise maintenance of nutrient homeostasis, which requires the integration of local nutrient availability with whole-plant demand. While the molecular components of local nutrient sensing and uptake are well-characterized, the systemic signaling networks that coordinate acquisition, allocation, and utilization across distant organs are less understood. This review synthesizes recent advances in understanding the systemic regulation of plant nutrient homeostasis. We highlight how plants coordinate photosynthetic activity in shoots with mineral nutrient absorption in roots to optimize growth. Furthermore, we examine the long-distance communication systems through which diverse mobile signals are translocated via the vasculature to synchronize root nutrient uptake with shoot photosynthetic status and developmental demands. Collectively, this synthesis illuminates the complex and finely tuned regulatory mechanisms that balance growth with environmental adaptation.