Abstract:

【Objective】 The mixed major gene plus polygenes inheritance of parthenocarpy in monoecious cucumber were studied to provide a theoretical basis for breeding monoecious cucumber varieties of strong parthenocarpy. 【Method】 Using the model of the major gene plus polygene of quantitative traits, a joint analysis of six-generations from crossing a highly parthenocarpic monoecious lines ‘6457’ with two non-parthenocarpic inbred lines ‘6429’ and ‘6426’ was carried out to investigate the inheritance of the parthenocarpy in cucumber in different backgrounds and seasons. 【Result】 The results showed that inheritance of parthenocarpy was controlled by two major genes and polygenes. The additive effects of the two major genes were great. The major gene heritabilities of B1, B2, and F2 were 72.2%-88.8%, 52.5%-93.1%, and 88.6%-95.4%, respectively. While the corresponding polygene heritabilities were 0-11.2%, 0-43.1%, and 0-1.5%, respectively. 【Conclusion】 The breeding of monoecious cucumber with highly parthenocarpy should choose parents that both are highly parthenocarpy. Selection of parthenocarpy can be carried out in the earlier generations of conventional crossing breeding.

Key words: cucumber')">cucumber, monoecious, parthenocarpy, major gene plus polygene, inheritance