Detection of a Gene in Pea Controlling Nonhost Resistance to Pseudomonas syringae pv. phaseolicola . John R. Wood. Department of Biological Sciences, University of the West of England, Frenchay Campus, Coldharbour Lane, Bristol, BS16 1QY. Alan Vivian(1), Carol Jenner(1), John W. Mansfield(2), and John D. Taylor(3). (1) Department of Biological Sciences, University of the West of England, Frenchay Campus, Coldharbour Lane, Bristol, BS16 1QY, (2) department of Biological Sciences, Wye College, Wye, Ashford, Kent, TN25 5AH, and (3)Horticulture Research International, Wellesbourne, Warwick, CV35 9EF, United Kingdom. Received 15 October 1993. Revision received 24 March 1994. MPMI 7:534-537. Accepted 26 April 1994. Copyright 1994 The American Phytopathological Society.

Cloned DNA from an approximately 150-kb plasmid in the bean pathogen Pseudomonas syringae pv. phaseolicola conferred avirulence on P. syringae pv. pisi toward its host, pea. Avirulence was determined by two loci, which appeared to match a single dominant resistance gene in the pea cultivar Kelvedon Wonder, the first gene for nonhost resistance to be identified in pea.