Because of this,
defence responses are neither simple nor easily predictable, but rather conditioned by the nutritional and signalling
status of the plant cell. This review discusses recent data and emerging concepts of how recognized defence
pathways interact with and are influenced by light-dependent processes. Particular emphasis is placed on the
potential roles of the chloroplast, photorespiration, and photoreceptor-associated pathways in regulating the
outcome of interactions between plants and pathogenic organisms.