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Regeneration and analysis of citrus interspecific mixoploid hybrid plants from asymmetric somatic hybridization

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Abstract

Embryogenic protoplasts of Dancy tangerine (Citrus reticulata Blanco) were X-ray irradiated at three doses and electrofused with iodoacetic acid-treated embryogenic protoplasts of Page tangelo (C. reticulata Blanco × C. paradisi Macf.). Shoots could regenerate only from the fusion combination with the lowest irradiation dose, but were recalcitrant to rooting. In vitro grafting was applied to obtain complete plants. Chromosome examination showed that the plants contained mainly diploid and aneuploid cells, together with few tetraploid cells, indicating that they were mixoploids. Random amplified polymorphic DNA analyses with 10-mer arbitrary primers confirmed the plants as true somatic hybrids. This is the first report on regeneration of mixoploid hybrid plants via protoplast asymmetric fusion in Citrus. Negative effects of ionizing irradiation on regeneration of embryoids and plantlets and possible agronomic interest of the mixoploid plants are also discussed.

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  1. National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, P.R. China

    Jihong Liu & Xiuxin Deng

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  1. Jihong Liu
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  2. Xiuxin Deng
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Liu, J., Deng, X. Regeneration and analysis of citrus interspecific mixoploid hybrid plants from asymmetric somatic hybridization. Euphytica 125, 13–20 (2002). https://doi.org/10.1023/A:1015748411654

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