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Genetic Studies of Self-Incompatibility in Carthamus flavescens Spreng¹

The inheritance of self-incompatibility was studied in Carthamus flavescens Spreng., a weedy relative of C. tinctorius L. (cultivated safflower). C. flavescens was found to have a single-locus sporophytic system of selfincompatibility with at least six alleles at the locus. Data from intercrosses among C. flavescens plants and F₂ and F₃ generations of interspecific crosses supported the hypothesis of dominance in the pollen and independent action of alleles in the style. The allele for self-compatibility, S_f, in C. tinctorius was intermediate in the dominance range of the self-incompatibility alleles identified in C. flavescens. There was evidence that dominance relationships were temperature sensitive. Considerable nonhomology of S alleles in C. flavescens and C. oxyacantha M.B. was indicated.

Key Words: Safflower • Pseudo-compatibility

² Research Scientist, C.S.I.R.O. Division of Tropical Pastures, St. Lucia, Qld., Australia, and Professor of Agronomy, University of California, Davis.

Received for publication February 21, 1970.