Xanthomonas campestris pv. translucens Strains Active in Ice Nucleation. H. K. Kim, Professor, Department of Plant Protection, Gyeongsang National University, Jinja, 620 Gyeongnam, Korea. C. Orser, S. E. Lindow, and D. C. Sands. Assistant Professor, Department of Bacteriology and Biochemistry, University of Idaho, Moscow 83843; Associate Professor, Department of Plant Pathology, University of California, Berkeley 94720; and Associate Professor, Department of Plant Pathology, Montana State University, Bozeman 59717. Plant Dis. 71:994-997. Accepted for publication 7 July 1987. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0994.

Xanthomonas campestris pv. translucens strains isolated from diseased barley plants expressed ice nucleation activity at temperatures from –2 to –8 C. Strains from 12 other Xanthomonas species or X. campestris pathovars did not exhibit ice nucleation activity at temperatures above –8 C. The ice nucleation activity of six strains of X. c. pv. translucens varied both quantitatively and qualitatively. The –5 C ice nucleation activity of strains of X. c. pv. translucens was correlated significantly with extent of frost injury at –5 C to corn seedlings inoculated with these strains.

Keyword(s): bacterial diseases of plants.