Little and Large Pathogen Effectors in Plant Resistance and Susceptibility

JONATHAN D G JONES; KEE-HOON SOHN; ALEXANDRE ROBERT-SEILANIANTZ; LIONEL NAVARRO; RAJENDRA BARI; RITA LEI; ALEJANDRA ROUGON-CARDOSO; GEORGINA FABRO

Sorrento, Italia

Congreso; XIII International Congress on Molecular Plant-Microbe Interactions; 2007

Molecular Plant Microbe Interactions (la revista)

Plant Pathogens use small molecules and also proteins to render their hosts susceptible. Several pathogens either make  plant hormones, or perturb host hormone signalling networks by other means. To counteract pathogen activation of auxin signalling, plants induce microRNA miR393 that targets the TIR1 auxin receptor, to attenuate auxin sensitivity. Furthermore, gibberellin made by fungal necrotrophic pathogens leads to attenuatiion of the defense response to necrotrophs by interference with jasmonic acid signalling. In addition, many bacteria and other pathogens use a specialized secretion system to deliver proteins into host cells that interfere with host defence. We have taken advanteage of the bacterial T3SS secretion system to investigate effectors from filamentous pathogens such as oomycetes. Recent data on oomycete effector functions will be reported.