VIEW ARTICLE

Resistance

Strains of Puccinia graminis Virulent on Wheat Plants Carrying Gene Sr27 Derived from Imperial Rye. N. H. Luig, Senior Research Fellow, Plant Breeding Institute, University of Sydney, Sydney, N.S.W. 2006, Australia; I. A. Watson, Professor, Plant Breeding Institute, University of Sydney, Sydney, N.S.W. 2006, Australia. Phytopathology 66:664-666. Accepted for publication 8 January 1976. DOI: 10.1094/Phyto-66-664.

Gene Sr27, present in Acosta’s wheat (Chinese Spring) - rye (Imperial) translocation line WRT.238.5, was transferred by successive backcrosses to a genetic background susceptible to Puccinia graminis secalis. Lines obtained this way exhibited high infection types to a synthetic hybrid between P. graminis tritici and P. graminis secalis, and to several strains of scabrum rust that are putative hybrids between the two formae speciales. Further tests showed that the hybrid culture had inherited the virulence on plants with Sr27 from its P. graminis secalis parent. Intervarietal crossing in P. graminis in relation to the transference of resistance from alien species to wheat is discussed.