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Parthenocarpy in pepino ( Solanum muricatum  Aiton) can overcome poor fruit set caused by pollination deficiencies. In two families involving a parthenocarpic parent (P p ), a nonparthenocarpic parent (P np ), and the generations P p ⊗, P np ⊗, F 1 , BC p , BC np , and F 2 , we studied three traits that are often confused: parthenocarpy, efficiency of parthenocarpy over seeded fruit set, and the degree of facultative parthenocarpy. Plants were trained to two stems (A and B). On stem A we emasculated six flowers per truss; three were pollinated and the other three were left unpollinated. We considered that a plant was parthenocarpic if it set one or more seedless fruit similar in size and shape to those seeded, and nonparthenocarpic if it only set seeded fruit. The efficiency of parthenocarpy over seeded fruit set was measured with a parthenocarpic fruit set index (PFSI), defined as twice the ratio of seedless to total fruit on stem A. In stem B all flowers were left to self-pollinate naturally. We quantified the degree of facultative parthenocarpy as the percentage of seedless fruit of the total. Parthenocarpy is controlled by one dominant gene for which we propose the symbol  P.  Parthenocarpic fruit set in the homozygote  PP  was as efficient as the seeded one (PFSI ≈ 1); in the heterozygote  Pp  it was less efficient (PFSI ≈ 0.6). The dose of gene  P  explained the differences found between generations for the PFSI and made it possible to predict the PFSI of a given generation from the proportions of  PP  and  Pp  genotypes. Although for the  Pp  hybrids parthenocarpic fruit set was less efficient than the seeded one, their ability to set seedless fruit in conditions of deficient pollination, together with their high degree of heterosis, makes them agronomically useful. The degree of facultative parthenocarpy seemed to be a complex trait with low heritability. In environments unfavorable for pollination, parthenocarpic genotypes set seedless fruit, thus ensuring crop production and yield stability. Using the degree of facultative parthenocarpy to classify plants for parthenocarpy is not recommended. Developing parthenocarpic cultivars can help spread this crop and stabilize yields.

The Inheritance of Parthenocarpy and Associated Traits in Pepino