Inheritance of Rust Resistance in Safflower1
- D. E. Zimmer and
- A. L. Urie22
The inheritance of resistance in safflower, Carthamus tinctorius L., to the foliage and seedling phase of rust, incited by Puccinia carthami Cda., was studied in crosses between rust-susceptible lines and three resistant selection (‘PI 195895-95,’ ‘PI 250601-109,’ ‘PI 253914-5’). The relationship between the genes for resistance of these selections and the resistance genes of ‘7083-245-8,’ ‘PI 250721-73,’ and ‘Nebraska 1-1-5’ was determined from the segregation ratios exhibited in the F2 and F3 generations. Three independently inherited-dominant-factor pairs AA, II, and MM, which individually and collectively condition resistance to both seedling and foliage rust, were found — Gene A in PI 253914-5, gene M in PI 195895-95 and 7083-245-8, and gene I in PI 250601-109 and PI 250721-73. Genes A, I, and M were inherited independently of the exclusionary resistance gene-pair N1N1 of Nebraska 1-1-5. They are believed to be unrelated to the OyOy gene pair for resistance in Carthamus oxyacantha M.B.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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