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Atypical tomato petiole lesions associated with the Clavibacter michiganensis ssp. michiganensis expansin mutant ΔCmEXLX2. (A) An individual petiole lesion rupturing a vascular bundle. Necrosis appeared to be confined to the vasculature with healthy plant tissue surrounding the petiole lesions. (B) Multiple lesions localized to the vasculature of an individual petiole. Black arrows highlight the large canker lesions present along multiple vascular tracks.
