S-gene polymorphism in phlox drummondii

Abstract

The genetic control of self-incompatibility and the number of 5-alleles were studied in a population of Phlox drummondii from Lytle, Texas. Thirty-four seedlings were transplanted to the greenhouse. Each was self-fertilized (using bud pollination) to generate self families of 9-11 plants. Complete diallels were performed within each family. Twenty-four families contained three crosscompatibility phenotypes whose crossing relationships indicated that self-incompatibility was under gametophytic control and governed by one gene. Homozygotes from twenty-four families were crossed in a half-diallel for 5-genotype assignment. Thirty 5-alleles were detected. Allele frequencies did not deviate significantly from equality. © 1993 The Genetical Society of Great Britain.