The biological characters and polyploidy of progenies in hybridization in 4x-2x crosses in Dianthus caryophyllus
文献类型： 外文期刊
作者： Zhou, Xuhong 1 ; Su, Yan 1 ; Yang, Xiumei 1 ; Zhang, Yiping 1 ; Li, Shengchong 1 ; Gui, Min 1 ; Wang, Jihua 1 ;
作者机构： 1.Yunnan Acad Agr Sci, Flower Res Inst, Longtou St, Kunming North Suburb 650205, Yunnan, Peoples R China
关键词： 4x-2x;Dianthus caryophyllus;Heterozygosity;Tetraploid hybrid;Unreduced gamete
期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）
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收录情况： SCI
摘要： Crosses were carried out between tetraploid Dianthus caryophyllus cv 'Butterfly' (2n = 4x= 60) and seven diploid cultivars (2n = 2x= 30). Fewer seeds were obtained and the low seed germination was found which suggested the post-fertilization barrier in 4x-2x crosses. 12 progeny were obtained from 5 crossing combinations. Chromosome analysis revealed that they consisted of 5 triploid hybrid plants and 7 tetraploid hybrid plants, suggesting that unreduced male gamete maybe be involved in polyploid formation. Various flower shapes and colours were observed in the polyploid progenies, showing that sexual polyploidization results in greater variability and fitness. The hybrids obtained by 4x-2x crosses showed the flower-size intermediate between the parents or larger than the parents. Some favourable characters of parents such as flower shape, flower colour and resistance to Fusarium oxysporum, were successfully transmitted to the hybrids. Since polyploid hybrids have some of the profitable characters of the parents, they are expected to be used for future breeding in carnation.
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