Features and properties of tangerine hybrids derived from distant hybridization (Citrus var. unshiu×Poncirus trifoliata)

Among citrus crops in the subtropical zone of the of the Russian Federation Black Sea coast of Krasnodar Territory, only tangerines can be grown (Citrus reticulata Blanco var. unshiu Tan.). The expansion of planting is hindered by poor winter hardiness, that’s why breeders are faced with a task of creating new forms of mandarin that are maximally adapted to the extreme climatic conditions of the region. By using of a distant hybridisation it is possible to create such forms. Purposeful distant hybridization allows transferring the properties of one genus to another, which is leading to phenotypic and genotypic changes in hybrid generation. The article emphasizes the importance of distant hybridization. For the period 1995-2019, distant, recurrent and inter-hybrid hybridizations were carried out to create a new hybrid fund. The results of 19 combinations of crossing by using Poncirus trifoliata Raf., and hybrids which were obtained with the participation of this genus, as well as hybrid species: C.×insitorum, C.×citrangeqwa and the genus Fortunella Sw. Expanded forms were selected for further breeding with an early term of fruit ripening (I decade of October): YuМR-97; YuКR-22; ККR-27; ККR-22; МRКR-97-25; МRКR-97-25-1; КRМR-25-97, with later ripening (II decade of October: КVI-1, КVI-3, YuI-12 received with C. insitorum. Also with late maturity hybrids were revealed: КРF-25; КРF-22; МРF-97; TsКR-25; YuTs-8 with the immixture of Fortunella margarita and C. citrangeqwat. From recurrent and inter-hybrid hybridization were marked out promising forms of mandarin with positive features such as early ripening, average fruit mass and a high tasting assessment. The greatest breeding value is represented by hybrids derived with the immixture of the most frost-resistant ccongeners of the citrus Poncirus trifoliata, however, from 5.0 % to 6.25 % of promising samples were selected in these families. All forms have breeding value for further work on creating winter hardiness varieties of mandarin.

citrus fruits, mandarin, breeding, distant hybridization , hybrids, features, properties, winter hardiness

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