Linkage of the incompatibility locus and red pigmentation genes in hazelnut

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Abstract
Red-leafed hazelnut trees have value as ornamentals, as rootstocks, and for genetic and pollination experiments where a seedling marker gene is useful. Genetic analysis of the mode of inheritance of the red plant tralt was made and the S-alleles were determined for 80 red-leafed trees. The S locus was found to be tightly linked to the A locus, and the A locus is linked to a C locus with a crossover value of about 18 percent. Both A and C must be present in the dominant form to produce pigmentation. The identification of two dominant A alleles from different sources and with different phenotypic expression expands the potential for genetic improvement.