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Inheritance of Rust Resistance in Safflower¹

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.

Key Words: Carthamus tinctorius L. • Exclusionary rust resistance • Sources of rust resistance • Genetic diversity • Puccinia carthami Cda.

² Research Plant Pathologist and Research Agronomist, Crops Research Division, ARS, USDA, Logan, Utah.

Received for publication January 27, 1969.