Reproduction mode in the allopolyploid facultatively apomictic hawkweed Hieracium rubrum (Asteraceae, H. subgen. Pilosella)

Hereditas
Anna KrahulcováFrantišek Krahulec

Abstract

The versatility of the breeding system in the hybridogenous hexaploid, Hieracium rubrum, was demonstrated in emasculation and crossing experiments. The flow-cytometric ploidy analysis of 1095 seedlings amongst its' progeny enabled the determination and quantification of the reproductive pathway (apospory, haploid parthenogenesis, cross-fertilization of both reduced and unreduced female gametes) responsible for each progeny class. The progeny profiles were stable between two successive years. The percentage of hybrids arisen from crosses with tetraploid sexual H. pilosella was 7.9%. The rate of trihaploids generated by H. rubrum when crossed to H. pilosella was 3.95%, similar to that of pentaploid (n + n) and octoploid (2n + n) hybrids (3.95% and 3.39%). Unreduced pollen from H. pilosella contributed to hybridization much less frequently (0.56% of all progeny), than unreduced eggs of H. rubrum. The increased frequency of trihaploids formed by crossed compared to emasculated plants suggests an interaction between the presence of pollen and the autonomous development of meiotic embryo sacs. Although the environmental conditions (garden compared to unheated glasshouse) influenced the progeny following the emasculation, no correspon...Continue Reading

References

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Citations

Jun 20, 2012·Sexual Plant Reproduction·Radka RosenbaumováFrantišek Krahulec
Mar 21, 2006·Journal of Molecular Evolution·T Roderick DockingDaniel J Schoen
Aug 11, 2007·The New Phytologist·Rebecca Hufft Kao
Mar 11, 2006·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Jan Suda, Pavel Trávnícek
Mar 23, 2011·The Plant Journal : for Cell and Molecular Biology·Anna M G KoltunowRoss A Bicknell
Aug 27, 2014·American Journal of Botany·Michael B BurgessChristopher S Campbell

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