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The Journal of Heredity 1984:75(1):62-66
© 1984 The American Genetic Association 75:62-66

research-article

Expression and inheritance of parthenocarpy in ‘Severianin’ tomato

Steve Lin, William L. George, and Walter E. Splittstoesser

Department of Horticulture, University of Illions 1301 W. Gregory Drive, Urbana, IL 61801

Please address reprint requests to W. L. George

Abstract

The expression of parthenocarpy in the tomato cultivar Severianin is facuttative, producing seeded and/or seedless fruits depending on the environmental conditions. The genetics of this facuitative parthenocarpy in Severianin was verified as being controlled by a single recessive gene, pat-2. Expressivity of pat-2 is strong in environments unfavorable for normal pollination and fertilization of flowers in tomato; for example, high night and day temperatures in midsummer in Urbana, Illinois. Plant breeders should find this trait useful as an adjunct system to promote fruit setting in tomato, particularly in stress environments where it has the ability to form normal but seedless fruits. Selection for parthenocarpy without the labor-intensive procedure of emasculation is efficient when segregating populations are grown in temperature stress environments. This parthenocarplc gene may be associated with determinate growth habit and/or earliness through pleiotropic effects and not genetic linkages. No genetic linkages were detected with aw, c, ps, u, and y.


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