Identification and origin of Xanthomonas campestris pv. campestris races and related pathovars

Citation
Jg. Vicente et al., Identification and origin of Xanthomonas campestris pv. campestris races and related pathovars, PHYTOPATHOL, 91(5), 2001, pp. 492-499
Citations number
37
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
PHYTOPATHOLOGY
ISSN journal
0031-949X → ACNP
Volume
91
Issue
5
Year of publication
2001
Pages
492 - 499
Database
ISI
SICI code
0031-949X(200105)91:5<492:IAOOXC>2.0.ZU;2-2
Abstract
One hundred sixty-four isolates of Xanthomonas campestris pv. campestris an d other X. campestris pathovars known to infect cruciferous hosts (X. campe stris pvs. aberrans, raphani, armoraciae, and incanae) were inoculated onto a differential series of Brassica spp. to determine bath pathogenicity to brassicas and race. Of these, 144 isolates were identified as X. campestris pv. campestris and grouped into six races, with races 1 (62%) and 4 (32%) being predominant. Other races were rare. The remaining 20 isolates from br assicas and other cruciferous hosts were either nonpathogenic or very weakl y pathogenic on the differential series and could not be race-typed. Five o f these isolates, from the ornamental crucifers wallflower (Cheiranthus che iri), stock (Matthiola incana) and candytuft (Iberis sp.), showed clear evi dence of pathovar-like specificity to the hosts of origin. A gene-for-gene model based on the interaction of four avirulence genes in X. campestris pv . campestris races and four matching resistance genes in the differential h osts is proposed. Knowledge of the race structure and worldwide distributio n of races is fundamental to the search for sources of resistance and for t he establishment of successful resistance breeding programs.