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Inheritance of Field Reaction to Soil-Borne Wheat Mosaic Virus¹

A five-parent incomplete winter wheat diallel cross was studied for inheritance of field reaction to Soil- Born Wheat Mosaic Virus (SBWMV).

Resistance was found to be monogenic dominant over both susceptibility to mosaic and to mosaic-rosette, and susceptibility to mosaic was, likewise, monogenic dominant over mosaic-rosette susceptibility. The results were interpreted on the basis of the operation of a multiple allelic series consisting of three alleles, viz, (1) R^mr which governs resistance to mosaic and mosaic-rosette, (2) ^m which is recessive to R^mr and conditions susceptibility to mosaic but is resistant to the rosette phase and (3) ^mr which is recessive to both R^mr and ^m and is responsible for mosaic-rosette susceptibility.

Key Words: Winter wheat • Rosette • Genetics • Multiple allele

² Graduate student in Agronomy (now Associate Dean, J. Nehru Agricultural University, India), and Professors of Agronomy and Plant Pathology, University of Illinois, Urbana-Champaign 61801, respectively.

Received for publication August 25, 1969.

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