Cassava bacterial blight (CBB), incited by Xanthomonas axonopodis pv. manihotis (Xam), is the most important bacterial disease of cassava, a staple food source for millions of people in developing countries. Here we present a widely applicable strategy for elucidating the virulence components of a pathogen population. We report Illumina-based draft genomes for 65 Xam strains and deduce the phylogenetic relatedness of Xam across the areas where cassava is grown. Using an extensive database of effector proteins from animal and plant pathogens, we identify the effector repertoire for each sequenced strain and use a comparative sequence analysis to deduce the least polymorphic of the conserved effectors. These highly conserved effectors have been maintained over 11 countries, three continents, and 70 y of evolution and as such represent ideal targets for developing resistance strategies.

https://dx.doi.org/10.1073/pnas.1208003109

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https://dx.doi.org/10.1073/pnas.1208003109

Cassava; Plant Diseases; Disease Control; Plant Genetic Resources

Innate Immunity; Type Three Effectors; Next-Generation Sequencing; Cassava; Plant Diseases; Xanthomonas Axonopodis Pv. Manihotis

Africa; East Africa; West Africa

Uganda; Nigeria

Proceedings of the National Academy of Sciences