Sexual reproduction as a source of ploidy level variation in the model agamic complex of Pilosella bauhini and P. officinarum (Asteraceae: Lactuceae)

0444281 - BÚ 2016 RIV AT eng J - Článek v odborném periodiku
Rosenbaumová, R. - Krahulec, František
Sexual reproduction as a source of ploidy level variation in the model agamic complex of Pilosella bauhini and P. officinarum (Asteraceae: Lactuceae).
Plant Systematics and Evolution. Roč. 301, č. 1 (2015), s. 279-290. ISSN 0378-2697. E-ISSN 1615-6110
Institucionální podpora: RVO:67985939
Klíčová slova: Pilosella * residual sexuality * hybridization
Kód oboru RIV: EF - Botanika
Impakt faktor: 1.361, rok: 2015

We studied the significance of sexual reproduction as a source of ploidy level variation in a model system consisting of hexaploid, facultatively apomictic Pilosella bauhini and tetraploid, sexual P. officinarum. As the maternal parent, apomictic P. bauhini generated higher ploidy level variation than sexual P. officinarum. Ploidy levels of its progeny ranged from triploid to octoploid under experimental conditions and even to decaploid in the field. This progeny diversity resulted from the breeding system in P. bauhini, which included haploid parthenogenesis and sexual reproduction through both reduced and unreduced gametes besides prevailing apomixis; these particular reproductive pathways have been quantified. Sexual P. officinarum, on the other hand, reproduced exclusively through fusion of reduced gametes and produced only pentaploid hybrids or tetraploid progeny from autogamy, allogamy or both. Surprisingly, sexual P. officinarum was also the species showing stronger reproductive isolation, especially under the field conditions where intra-specific fertilization was highly favoured, most probably through competition between conspecific and heterospecific pollen. Apomictic P. bauhini thus appeared to be a significant source of ploidy level variation in the model population even though most of its progeny was formed clonally through apomixis. Only part of this variation was manifested in the field.
Trvalý link: http://hdl.handle.net/11104/0246828