plant stress response trait biotic plant stress trait TO:0000179 A plant stress response trait (TO:0000164) which is the response of a plant structure (PO:0009011) to biotic plant stress (PSO:0000011). Plant biotic stress traits may be manifested in either the whole plant (PO:0000003) or in parts of the plant, as a result of the exposure to a biotic plant stress (PSO:0000011). Responses to biotic plant stresses may vary from resistance to susceptibility, with varying levels of tolerance. Biotic stresses are those resulting from living factors such as microorganisms, animals (including insects, arachnids and nematodes) or other plants. plant_trait_ontology