VIEW ARTICLE

Genetics

Inheritance of Reaction of Orchardgrass to Puccinia graminis f. sp. dactylidis. Mary Lou Schubert, Research assistant, Department of Plant Pathology, University of Missouri, Columbia 65211; W. Q. Loegering(2), and D. A. Sleper(3). (2)Professor emeritus, Department of Plant Pathology, University of Missouri, Columbia 65211; (3)Associate professor, Department of Agronomy, University of Missouri, Columbia 65211. Phytopathology 72:1032-1034. Accepted for publication 13 November 1981. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-1032.

The genetics of reaction of autotetraploid Dactylis glomerata to Puccinia graminis f. sp. dactylidis was studied on S₁ populations of 29 F₁ plants (clones) from a cross of two nearly self-incompatible parents. While segregation for reaction in each selfed population was observed and there was similarity in the segregation of the progeny from most of the clones in each of 2 yr, distinct autotetraploid ratios were not found. The reasons for this were not clear though environmental effects, linkage of self-incompatibility and reaction, aneuploidy, allelism, chromotid versus chromosome segregation, preferential pairing, and the possibility that segregation for reaction occurred at more than one locus are suggested as possible causes.