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Abstract Detail

Hybrids and Hybridization

Oleas, Nora [1], Zweck, Justin [1], Moreno, Mauro [1], Peña, Paola [1].

Speciation as a result of hybridization between genera of Amaryllidaceae in the tropical Andes hotspot.

Hybridization has played an important role on plant speciation. Even though hybridization is common among plant species, these events are less frequent among genera. For the first time, we report natural hybridization among two Amaryllidaceae genera from the Tropical Andes. There are three sympatric species living inside the crater of the Pululahua volcano in Ecuador. Phaedranassa viridiflora is an endangered and endemic species to Ecuador with yellow flowers. Phaedranassa dubia (red flowers) and Stenomesson aurantiacum (orange flowers) have a wider geographic distribution in Ecuador and Colombia. Previous genetic studies using microsatellites suggested gene flow between Phaedranassa viridiflora and P. dubia resulting in a putative hybrid Phaedranassa with orange flowers. However, subsequent reproductive biology studies failed to identify fruits and viable pollen of P. viridiflora and the hybrid. To unravel the origin of the putative orange Phaedranassa hybrid, we explored several lines of evidence. Intergeneric crosses by hand pollination of P. dubia and S. aurantiacum resulted in viable seeds for all the interbreeding treatments. Most of the seeds germinate and the seedlings were genotyped. In the field, a metallic bee of the genus Agapostemon was observed visiting the flowers of all taxa. The assortment of phenotypes found inside the Pululahua volcano crater might be the result of gene flow facilitated by the bee. Our results are the first example of natural intergeneric hybridization leading to speciation in Andean Amaryllidaceae.

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1 - Universidad Tecnologica Indoamerica, Machala y Sabanilla, Quito, Pichincha, 170301, Ecuador

Plant Reproduction Biology

Presentation Type: Oral Paper
Session: 10, Hybrids and Hybridization
Location: 101/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 4:30 PM
Number: 10012
Abstract ID:857
Candidate for Awards:Margaret Menzel Award

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