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Resistance

New Sources of Resistance to Puccinia hordei in Barley Land Race Cultivars. A. H. Yahyaoui, Assistant professor, Esak, Tunisia; E. L. Sharp(2), and M. Reinhold(3). (2)(3)Professor, and Adjuncts assistant professor, Plant Pathology Department, Montana State University, Bozeman 59715. Phytopathology 78:905-908. Accepted for publication 21 January 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/Phyto-78-905.

New genes for resistance to Puccinia hordei appeared to be common in several collections of barley (Hordeum vulgare) land race cultivars originating in central and southern Tunisia. Response of four land race cultivars to a number of different isolates of P. hordei from the Mediterranean region differentiated them from the known genotypes. A dominant resistance gene that behaved as Pa₃ was found in Tu32. Three of the land race cultivars (Tu17, Tu27, and Tu34) each have a dominant resistance gene that is most likely different from the previously known resistance genes. The dominant resistance genes identified in this study were as effective as Pa₃ and Pa₇ and, hence, should be considered for use as new sources of resistance. Further testing is needed to determine the genetic relationships between these genes.