European Journal of Plant Pathology (2013) 135, 115-125

Jatindra Nath Samanta, Kunal Mandal and Satyabrata Maiti (2013)
A novel pathovar of Xanthomonas axonopodis causes gumming of Guggal (Commiphora wightii)
European Journal of Plant Pathology 135 (1), 115-125
Abstract: Guggal (Commiphora wightii (Arnott) Bhandari comb. nov.) is a small tree which is tapped for medicinally important oleo-gum-resin. Naturally infected plant oozes oleo-gum-resin from its trunk and primary branches. However, in either case, the plant dies slowly after oozing. A bacterium was established to be responsible for these phenomena. Four isolates of this bacterium were characterised by biochemical tests, Biolog GN2 microplate reaction, rDNA sequencing, which suggested that the pathogen belonged to the genus Xanthomonas. However, phylogenetic analysis based on chaperone protein (dnaK) gene, TonB-dependent receptor (fyuA) gene, DNA gyrase B (gyrB) gene and RNA polymerase sigma factor (rpoD) gene sequences placed it as a member of X. axonopodis 9.2 rep-PCR/DNA-DNA homology cluster close to X. perforans, X. alfalfae and X. euvesicatoria. Further elucidation of phylogenetic position of the test strains was achieved from a gyrB based tree considering sequences from 71 representative strains. Test strains were confirmed to be members of X. axonopodis. These had very narrow infectivity limited to Commiphora spp. Hence, we propose a novel pathovar, X. axonopodis pv. commiphorae pv. nov. as the cause of gum oozing in guggal. Pathotype is DXA 01 = CFBP 7580 = LMG 26789.
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Link to article at publishers website
Database assignments for author(s): Kunal Mandal, Satyabrata Maiti

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xanthomonas axonopodis pv. commiphorae	Commiphora (crop)	India
	Xanthomonas axonopodis