Constitutive defence activation in plants leads to resistance to a broad-spectrum of pathogens, but also frequently to stunted growth and reduced seed sets; how do plants decide whether to defend against infection or to utilise energy for growth? Plant hormones are important integrators of the physiological responses that influence the outcome of plant-pathogen interactions.
Albrecht and Argueso discuss the mechanisms by which the plant hormone cytokinin regulates both plant growth and response to pathogens, and document the ways in which cytokinins may connect these two processes, ultimately affecting the growth trade-offs observed in plant immunity.
Albrecht, T., & Argueso, C. T. (2016). Should I fight or should I grow now? The role of cytokinins in plant growth and immunity and in the growth–defence trade-off. Annals of Botany, mcw211. https://doi.org/10.1093/aob/mcw211