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The plant immune system is broadly characterised as a cell autonomous response system; in general, all plant cells are capable of pathogen perception and response. However, plasma membrane-lined pores that connect neighbouring cells called plasmodesmata are regulated during immune responses, identifying that cell-to-cell connectivity and communication is a component of immune signalling. Plasmodesmata close in response to the perception of pathogens, mediated by specialised immune signalling cascades located at plasmodesmata. Antagonistically, pathogens can also regulate plasmodesmata to gain access to non-infected cells. Our research investigates how plasmodesmata and cell-to-cell connectivity are regulated within, and underpin, both immunity and infection.