An Effector from an Oomycete Pathogen affects Arabidopsis Growth Pattern

BOGINO MARIA FLORENCIA; FABRO GEORGINA

Córdoba

Congreso; XXXII Reunión Argentina y XVI Congreso Latinoamericano de Fisiología Vegetal; 2018

Sociedad Argentina de Fisiología Vegetal - SAFV.

Pathogens harbor conserved molecules that are essential to their fitness known as Pathogen Associated Molecular Patterns (PAMPs). Certain plant hosts recognize these molecules as non-self, triggering a first layer of defense responses, called Pathogen Triggered Immunity (PTI). Adapted pathogens evolved ?effectors?: secreted proteins capable to overcome those defense responses. Thus, a successful invasion will depend on the host genotype, as some plants also evolved to recognize effectors and activate another layer of defense responses (Effector Triggered Immunity - ETI). HaRxL106 is an effector from the oomycete Hyaloperonospora arabidopsidis, an obligated biotrophic pathogen of A. thaliana. It has an RxLR domain that is probably implied in translocation to the host cytosol. Studies in yeast two hybrids (Y2H) demonstrated its interaction with IAA11 and BIM1, two transcription factors from the auxins and brassionoesteroids pathways, respectively. Moreover, when HaRxL106 is constitutively expressed in planta, the transgenics phenocopy the Shade Avoidance Syndrome (SAS). We will present experiments intending to elucidate if the changes observed in plant growth pattern are dependent on modulations of the auxins and/or brassionesteroids pathways by HaRxL106.