Abstract
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) Rmr which governs resistance to mosaic and mosaic‐rosette, (2) γm which is recessive to Rmr and conditions susceptibility to mosaic but is resistant to the rosette phase and (3) γmr which is recessive to both Rmr and γm and is responsible for mosaic‐rosette susceptibility.
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