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Abstract Detail

Host/Plant Pathogen Interactions and Plant Health Management

Sormany, François [1], Joly, David L. [1].

Preliminary analysis of organ-specificity in Phytophthora infestans, causal agent of potato late blight.

Plant pathogens secrete virulence factors (also called effectors) that interfere with the plant immune system and allow their colonization in host tissues. Ironically, plants possess resistance genes (R genes) able to recognize some of these effectors and trigger a defense response to block the spread of these pathogens. When an effector is recognized by an R gene, it is dubbed an avirulence factor (Avr). Modern breeding approaches attempt to take advantage of these avirulence factors to accelerate the identification of new resistant cultivars. One of the most devastating potato (Solanum tuberosum L.) disease is late blight, caused by Phytophthora infestans (Mont.) de Bary. While several Avr genes have been identified in P. infestans, most of the knowledge regarding their activity has been obtained following foliage infection. Yet P. infestans also attacks tubers, and it is known that some R genes are effective only in potato leaves. The existence of differential infectious process according to the infected organ is a relatively unexplored area, but it is clear that some plant pathogens deploy some effectors in an organ-specific manner. The objectives of this project are (1) the comparison of the P. infestans infection process in different organs (leaves vs. tubers), and (2) the identification of the genetic determinants responsible for the absence of resistance in tubers from otherwise resistant plants. To this end, Avr gene expression profiles will be analyzed, as well as their ability to trigger defense responses in these organs.

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1 - Université de Moncton, Département de biologie, 18 avenue Antonine-Maillet, Moncton, NB, E1A 3E9, Canada

Plant-Pathogen Interaction

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PPA035
Abstract ID:1032
Candidate for Awards:CPS Best Student Presentation Awards

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