How coupling resources and development ensures whole-plant homeostasis

Plants maintain internal stability even amid fluctuating external conditions. For energy, nutrients, and fixed carbon, this relies on the dynamic coordination between resource acquisition and allocation to maintenance, growth, and development. However, individual cellular changes in activity are limited in their impact. Instead, systems-level adaptation in multicellular organisms requires collective action and coordination of how resources are used in the rate of formation, precise anatomy, and physiological activity of newly formed organs. This further requires intricate linking between established energy and nutrient signalling pathways and development mechanisms that integrate responses over space and time. Developmental pace and resource homeostasis represent two sides of the same coin and are facilitated by coupled feedback between resource uptake and morphological efficiency. The trilateral framework between availability, developmental pace, and morphology determines resource management, and as such whole-plant resilience and climate adaptation strategies. We explore how feedback mechanisms mediate local resource acquisition of carbon, nitrogen, and phosphorus, how developmental programs such as organogenesis, root foraging response, and branching match resource availability over space and time, and how architectural and morphological efficiency of roots and shoots minimize investment costs and maintain development acquisition potential to facilitate high demands for growth.