Graduate Thesis Or Dissertation
 

The inheritance of parthenocarpy in tomato (Lycopersicon esculentum)

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/q811kp22m

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  • A parthenocarpic breeding line, Oregon T5, from Oregon State University, was crossed with several commercial cultivars. Progenies were studied for 2 years as both direct-seeded plants and transplants in the field at Corvallis, Oregon to determine the inheritance of parthenocarpy in Oregon T5. Both quantitative and qualitative measurements of parthenocarpy were used. F₁, F₂ and backcross data indicated that the inheritance of parthenocarpy in T5 is recessive. F₂ data fit a 9 seedy:7 seedless ratio, suggesting duplicate recessive genes. F₂ data from a cross with 'Severianin', an unrelated parthenocarpic cultivar, indicated the inheritance of parthenocarpy in T5 is due to different genes than in 'Severianin'. These data also support the hypothesis of 2 genes for parthenocarpy in T5, with a possible interaction of modifiers for parthenocarpy from both parents. Chi square tests showed an association between parthenocarpy and earliness as measured by number of days to first ripe fruit. This earlier ripening in T5 crosses resulted from a shorter interval between flowering and ripening, and not from earlier flowering, in most cases. In general, no association was indicated between parthenocarpy and fruit size.
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