effector-biology
Effector biology is the study of proteins secreted by plant pathogens—such as fungi, oomycetes, and bacteria—that manipulate host plant cellular processes to promote infection and suppress immunity. Understanding how these effectors function and interact with plant targets is critical for deciphering the molecular arms race between pathogens and their hosts. This knowledge drives the development of disease-resistant crop varieties by identifying key plant immune components that pathogens exploit or that can be engineered to recognize and neutralize effector activity.
PubMed · 2026-04-06
Scientists mapped the 'infection toolkit' of a family of fungi that devastate woody plants worldwide, identifying core molecular tools these pathogens use across 25 species to disable plant defenses and cause disease.
Each of the 25 Botryosphaeriaceae fungal species carries between 56 and 183 candidate secreted effector proteins (CSEPs) — small proteins used to manipulate host plant immunity.
Conserved effector families (shared across species) are significantly outnumbered by diversified ones, and the conserved ones are likely inherited through normal reproduction while many diversified ones appear to have been acquired by swapping genes with other organisms (horizontal gene transfer).
Conserved effectors activate earlier and persist longer during host infection compared to diversified effectors, and experiments confirmed they actively suppress plant immune responses.