Journal of Heredity 2003:94(6)
© 2003 The American Genetic Association 94:449-456
Characterization and Inheritance of the Anthocyanin fruit (Aft) Tomato
From the Department of Horticulture, 4017 ALS, Oregon State University, Corvallis, OR 97331. C. M. Jones is currently at the C. M. Rick Tomato Genetics Resource Center, Department of Vegetable Crops, University of California, One Shields Ave., Davis, CA 95616.
Address correspondence to J. R. Myers at the address above, or e-mail: myersja{at}bcc.orst.edu.
Tomato (Lycopersicon esculentum) accession LA1996 with the Anthocyanin fruit (Aft) gene has dark green foliage, elevated anthocyanin expression in the hypocotyls of seedlings, and anthocyanin in the skin and outer pericarp tissues of the fruit. Interest in the health benefits and antioxidant capacity of anthocyanins led to this study of the genetic potential for increased levels of this important class of phytonutrients in tomato fruit. In order to conform to tomato gene nomenclature rules, we propose changing the symbol Af for Anthocyanin fruit to Aft. Segregation ratios of anthocyanin expression in F2 and BC1 populations of a cross between the processing tomato UC82B and LA1996 were consistent with a single dominant gene hypothesis. Anthocyanin expression was reduced in backcross populations compared to F2 populations. Anthocyanin concentration, as measured by the pH differential method, of pigment-rich pericarp and skin tissues from LA1996 was estimated to be 20.6 mg/100 g and 66.5 mg/100 g, respectively. Anthocyanidin composition was characterized by high-performance liquid chromatography (HPLC). Fruit of accession LA1996 contained predominantly petunidin, followed by malvidin and delphinidinin. Lycopene, ß-carotene, phytoene, and phytofluene levels were similar to those of normal tomatoes and lower than those found in high pigment tomatoes.
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