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The Journal of Heredity 1986:77(6):471-472
© 1986 The American Genetic Association 77:471-472

other

Genetics of self-Incompatibility in Calotis cuneifolia

Julla K. Davidson, and Helen M. Stace

J. K. Davidson is graduate student in the Department of Genetics and Human Variation, La Trobe University, Bundoora, Victoria 3083, Australia. The authors thank Dr. B. Brown for help with the maximum likelihood estimate, and Dr. V. Vithanage for the aniline blue fluorescent technique of observing pollen tubes. This research was supported by the Department of Genetics and Human Variation, La Trobe University, Bundoora, Victoria 3083, Australia.

Dr. Stace's present address is: CSIRO Davies Laboratory, Townsville, Queensland 4814, Australia.

Please address reprint requests to J. K. Davidson.

Abstract

Twelve plants from a diploid population of an Australian daisy Calotis cuneifolia were found to be self-incompatible. A diallel cross of all plants showed that each had a distinct incompatibility phenotype. Unilateral Incompatibility occurred in eight crosses. All incompatible pollen tubes were inhibited on the stigma surface. Each diallel of the progeny from a parental cross displayed four distinct phenotypes. The evidence presented is consistent with genetic control of incompatibility by a sporophytic one-locus system with several S alleles. A method for estimating the number of S alleles is presented. A maximum likelihood estimate of the number of S alleles in this sample is 12.


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