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Genetic relationship between races of Pseudomonas syringae pv.pisi and cultivars of Pisum sativum
Author(s) -
TAYLOR J. D.,
BEVAN J. R.,
CRUTE I. R.,
READER S. L.
Publication year - 1989
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1989.tb02155.x
Subject(s) - biology , pseudomonas syringae , sativum , pisum , cultivar , race (biology) , botany , virulence , gene , genetics
Isolates of Pseudomonas syringae pv. pisi from the UK and overseas were categorized into six races on the basis of their reactions to a range of differential pea (Pisum sativum) cultivars. Race 2 was predominant among the isolates examined and this probably reflects its relative international importance. A previously uncharacterized race (race 6) was virulent on all cultivars tested. Resistance to races 1‐5 was widespread in commercial cultivars and breeding lines with more than 75% showing resistance to one or more races. A preliminary study of the inheritance of resistance indicated that for races 1, 2 and 3, resistance was controlled by different dominant genes. The genetic basis for the relationship between races of P. syringae pv. pisi and pea cultivars was explained in terms of a gene‐for‐gene relationship involving five matching gene pairs. With further clarification of the genetics of resistance this host‐pathogen association will meet most of the requirements of a model system for the study of the genetic and molecular basis of pathogenicity and host specificity.