Inheritance of Reaction of Sorghum bicolor (L.) Moench to Toxin Produced by Periconia circinata (Mang.) Sacc.1
- K. F. Schertz and
- Y. P. Tai2
The inheritance was determined for the reaction of Sorghum bicolor (L.) Moench to the toxin produced by the saprophyte, Periconia circinata (Mang.) Sacc. (1) A precise laboratory screening technique was developed whereby seedlings were subjected to the toxin devoid of the P. circinata organism. (2) The inheritance of the host-pathogen reaction among established cultivars was confirmed to be controlled at a single locus. Susceptible seedlings (PcPc) died quickly, resistant seedlings (pcpc) grew normally, and heterozygotes (Pcpc) showed an intermediate response. (3) The mutation frequency from susceptibility to resistance (Pc→pc) was one per 7,876 gametes among 55,137 seedlings of ‘Colby,’ a susceptible cultivar.
Mutations at the controlling locus are sufficiently frequent to be of significance in a breeding program and the disease response is precise enough for critical genetic analyses.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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