Biology 4218A Lecture Notes - Lecture 15: Horizontal Resistance, Apoplast, Dicotyledon

• School: Western University
• Department: Biology
• Course: Biology 4218A
• Professor: Richard Gardiner

Document Summary

For each gene that determines resistance in the host, there is a corresponding gene in the pathogen that determines (a)virulence. Pathogen"s effector is recognized by host which induces resistance. Or binds co-receptor, which in turn interacts with r. Or r protein guards pathogenicity target, so once effector binds, defense mech occurs. Or protease-dependent defense (avr genes encodes protease, which cleaves host proteins, which activates defense mech) Overall ability of pathogen causing disease is a result of cultivars (gen var b/w plant varieties) and pathovars (gen var b/w pathogen strains) Avr gene: gene that can induce disease resistance in a host plant when that plant has corresponding r gene. A means avirulence factor so if plant has r gene then not susceptible. a means virulence factor because plant cannot detect any avr effector r means plant lacks resistance gene so it is susceptible. If disease occurs, still get yield as disease develops slowly.