Some assembly required: Modularity and programmability as keys to decoupling growth-defence trade-offs in plants

Growth-defence trade-off has long been considered an inevitable consequence of resource competition in plants. However, emerging evidence from autoimmune mutants and helper NLR studies reveals this paradigm to be fundamentally incomplete. Rather than simple resource limitation, plants coordinate growth-defence balance through programmable transcriptional networks centred on regulatory hubs such as the EDS1-PAD4-ADR1 (EPA) complex. Meta-analysis across diverse immune contexts demonstrates that defence and growth genes exhibit a remarkably consistent relationship, operating through segregated yet coordinated molecular modules. The discovery that ADR1 helper NLRs simultaneously enhance immune responses whilst actively suppressing growth-related genes-rather than competing passively for shared resources-exposes the coordinated nature of this trade-off. Networks downstream of ADR1 also exhibit remarkable regulatory exclusivity, and this modular organisation, combined with proof-of-concept successes in decoupling immunity from growth penalties through targeted genetic interventions, challenges the zero-sum assumption underlying current crop improvement strategies. Understanding these conserved regulatory circuits opens unprecedented opportunities for engineering optimised plant immunity without yield penalties, transforming agriculture from accepting inevitable trade-offs to programming flexible resource allocation.