Phylogeny and population structure of phylotype II ecotypes of Ralstonia solanacearum: Potato brown rot, banana Moko, and emerging strains
The ancient soil borne plant vascular pathogen Ralstonia solanacearum has evolved and adapted to cause severe damage on an unusually wide range of plants. To better describe and understand these adaptations, we grouped strains with very similar lifestyles and host specializations into ecotypes. We used comparative genomic hybridization (CGH) to investigate three particular ecotypes in the American phylotype II group: 1) Brown rot strains from sequevars IIB-1 and IIB-2, historically known as race 3 biovar 2; 2) New pathologenic variants from sequevar IIB-4NPB that lack pathogenicity to banana but can infect many other plant species; and 3) Moko disease-causing strains from sequevars IIB-3, IIB-4 and IIA-6, historically known as race 2, that cause wilt on banana, plantain and Heliconia. Brown rot IIB-1 strains originate from the Andes and were previously considered monophyletic (clonal) based on data from neutral marker typing of potato-infecting strains collected worldwide. Emerging IIB-4NPB strains are phylogenetically indistinguishable from IIB-4 Moko banana strains, despite their distinct host ranges. We used genome analysis of these very different but closely related phylotype II strains to decipher their population structure and gain clues about the biology of these ecotypes.
| Main Authors: | , , , , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
Oil crops research institute of chinese academy of agriculture sciences
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| Subjects: | H20 - Maladies des plantes, |
| Online Access: | http://agritrop.cirad.fr/563752/ |
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