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Media type:
E-Article
Title:
Diploidy suggests hybrid origin and sexuality in Sorbus subgen. Tormaria from Thuringia, Central Germany
Contributor:
Meyer, Norbert;
Gregor, Thomas;
Meierott, Lenz;
Paule, Juraj
imprint:
Springer-Verlag Gmbh, 2014
Published in:Plant Systematics and Evolution
Language:
English
ISSN:
0378-2697;
1615-6110
Origination:
Footnote:
Description:
<p>From Thuringia, Central Germany, seven presumably apomictic microspecies were described within Sorbus subgen. Tormaria (Sorbus aria × torminalis, S. latifolia group): Sorbus acutiloba, S. acutisecta, S. decipiens, S. heilingensis, S. isenacensis, S. multicrenata, and S. parumlobata. Flow cytometric ploidy estimation revealed one sample-standard ratio class for all taxa which corresponds to diploidy. As the apomixis in Sorbus is exclusive to polyploids we deduce that the sampled trees are F₁ or early diploid hybrids of the combination S. aria × torminalis. The oldest name for this combination is Pyrus × decipiens Bechst. 1810 (= Sorbus × decipiens (Bechst.) Petz. & G. Kirchn.). Hence, the wide-spread presumption that the diploid hybrid Sorbus × decipiens is rare, sterile, and only scarcely found between its parents does not apply for Thuringia. Here, this taxon forms relatively dense stands and spreads by suckering and fertile seeds.</p>