Abstract
Crosses were carried out between tetraploid Dianthus caryophyllus cv ‘Butterfly’ (2n = 4×= 60) and seven diploid cultivars (2n = 2×= 30). Fewer seeds were obtained and the low seed germination was found which suggested the post-fertilization barrier in 4×–2× 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 4×–2× 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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Acknowledgements
This study was funded by the National Engineering Research Center for Ornamental Horticulture (Grant number 2012FU125X10), Chinese Natural Science Foundation (Grant number 31460530), Yunnan Foundation Research Projects for Application (Grant number 2014FA044 and 2016IA001), Yunnan Young Academic and Technical Leader Training (Grant number 2015HB077), Yunnan Science and Technology Leader Training (Grant number 2016HA005).
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MG and JW designed research. XZ, YS, XY and YZ conducted experiments. SL analysed data. All authors read and approved the manuscript.
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Zhou, X., Su, Y., Yang, X. et al. The biological characters and polyploidy of progenies in hybridization in 4×–2× crosses in Dianthus caryophyllus . Euphytica 213, 118 (2017). https://doi.org/10.1007/s10681-017-1898-0
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DOI: https://doi.org/10.1007/s10681-017-1898-0