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A dominant gene, R, is hypothesized to control the red underfoliage color inheritance in tetraploid fibrous-rooted  Begonia  ×  semperflorens-cultorum . This dominant gene R is considered to also affect the intensity of the foliage color, with RRRR and RRRr giving dark red color on the underside of the leaves. The combination of RRrr and Rrrr gives intermediate red coloration, and homozygous recessive rrrr gives all green foliage. A homozygous RRRR inbred line is being test-crossed for potential commercial value. Cytological investigations of hybrids and inbreds derived from species crosses are ongoing. The results will be presented.

Cytogenetic Evaluation and Foliage Color Inheritance within Interspecific Begonia Inbreds