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This article in CS

  1. Vol. 11 No. 1, p. 6-9
    Received: Feb 21, 1970

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Genetic Studies of Self-Incompatibility in Carthamus flavescens Spreng1

  1. B. C. Imrie and
  2. P. F. Knowles2



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, Sf, 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.

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