Abstract
The inbred parental lines in this study were derived from varieties of sunflowers grown for their large edible seed (Helianthus annuus var macrocarpus (DC.) Ckll.) and from the wild type H. annuus ssp. annuus.A classification using the following types was found to be adequate for genetic studies of branching in sunflowers: 0 ‐ no branching, 1 ‐ basally branched, 2 ‐ top branched, 3 ‐ fully branched with a central head, 4 ‐ fully branched without a central head (wild type).Four genes for branching were named in this study: the dominant gene Br2 for top branching; the duplicate dominant genes Br2 and Br3 from the wild type parent; and the recessive genes b2 and b3 which gave a fully branched phenotype only when homozygous for both genes.The single gene Y for green versus yellow growing point color was found to be linked with the gene Br3 for branching with 11.6 ± 1.0% recombination.
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