The importance of phytohormone signaling in the regulation of plant development and defense responses has long been established. Reponses to particular classes of pathogens, such as those with biotrophic or necrotrophic lifestyles, occur through particular signaling pathways involving salicylic acid or jasmonic acid, with influences from other hormones such as ethylene, abscisic acid, brassinosteroids, and strigolactones. Additionally, the hormones auxin and gibberellic acid, so crucial for normal growth and development, have increasingly better defined roles in mediating plant responses to pathogens. Nevertheless, recent analyses have also revealed a complexity of cross-talk between plant hormone signaling pathways, and have uncovered how plant pathogens may sometimes interfere with or subvert hormone signaling.

This Research Topic explores these topics, with the purpose of providing additional information on plant hormone production and cross-talk in plant interactions with pathogens and insect pests, and how the pathogen may mimic or otherwise manipulate the levels of hormones or hormone signaling to their advantage to colonize the plant. Elucidating the complex web of hormone signaling in plant-pathogen interactions may provide new insights for the control of plant diseases.

We welcome Original Research and other article types falling under, but not limited to:

- Novel insights into the mode of action of hormone signaling in PAMP-triggered and effector-triggered immunity
- New insights on the cross-talk between plant defense hormone signaling pathways
- Studies on novel classes of plant growth promoting regulator molecules
- Studies revealing how hormonally-regulated host developmental programs are altered in plant interactions with pathogens/insect pests
- Production of compounds by plant pathogens that demonstrably alter host hormone signaling pathways and/or development

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Frontiers in Plant Science

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