Genetic Studies of Field Reaction to Wheat Soilborne Mosaic Virus. Rashied S. Modawi, Graduate Student, Department of Plant Pathology, Kansas State University, Manhattan 66506. E. G. Heyne, Professor, Dionisio Brunetta, Former Graduate Student, Agronomy Department, and William G. Willis, Professor, Department of Plant Pathology, Kansas State University, Manhattan 66506. Plant Dis. 66:1183-1184. Accepted for publication 19 April 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-1183.

The inheritance of field reaction to wheat soilborne mosaic in winter wheat was studied in F₁, F₂, F₃, and F₄ generations from a seven-parent diallel cross. The resistant parents were Shawnee, Oasis, KS73148, and KS73256. Centurk was moderately resistant, Gage moderately susceptible, and Eagle susceptible. Resistance and susceptibility were controlled by a single locus, with resistance dominant over susceptibility. The resistant lines seemed to share the same factor for resistance despite different origins. Centurk was a mixture of resistant and susceptible genotypes. No segregation for resistance was observed in Gage × Eagle cross, but later in the season the Gage type recovered from infection better than the Eagle type.

Keyword(s): disease resistance.