Abstract
Abstract The inheritance of a tendency to set parthenocarpic fruit in tomato (Lycopersicon esculentum Mill.) line Oregon T5-4 (T5) was studied in the field in crosses with 3 normal, seeded cultivars. F1, F2, and backcross data indicated that the parthenocarpic tendency in T5 is recessive. F2 data fit a 9 seeded : 7 seedless ratio, indicating that normal seediness requires 2 complimentary dominant genes. Parthenocarpic plants were earlier than seeded plants. Early ripening in T5 crosses resulted in most instances from a reduced period of time from first flower to first ripe fruit, and not from early flowering. The F2 from a cross of T5 with ‘Severianin’, an unrelated parthenocarpic cultivar, approached a theoretical 27 seeded : 37 seedless for 3 complimentary gene pairs and demonstrated that parthenocarpic tendency is determined by different factors in these 2 parents.
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