Molecular evidence of bidirectional introgression between Quercus suber and Quercus ilex

doi:10.3832/ifor2570-011

Molecular evidence of bidirectional introgression between Quercus suber and Quercus ilex

Unai López De Heredia, Héctor Sánchez, Alvaro Soto

iForest - Biogeosciences and Forestry, Volume 11, Issue 2, Pages 338-343 (2018)
doi: https://doi.org/10.3832/ifor2570-011
Published: Apr 18, 2018 - Copyright © 2018 SISEF

Research Articles

Collection/Special Issue: INCOTW - Sassari, Italy (2017)
International Congress on Cork Oak Trees and Woodlands
Guest Editors: Piermaria Corona, Sandro Dettori

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Cork oak and holm oak share a large part of their natural range, and are known to hybridize in mixed stands. This hybridization is supposed to have played a relevant role in the past history of cork oak. Previous research has reported that F₁ hybrids are produced with holm oak acting as pollen recipient, therefore carrying holm oak chloroplast. Additionally, F₁hybrids have been assumed to be pollinated mostly by cork oak. Continued backcrossing of F₁hybrids with cork oak (supported by flowering phenology) could have created the organellar introgression patterns observed nowadays in Eastern Spain and Southern France cork oak populations. On the contrary, no organellar introgression has been detected in holm oak and multiple generation backcross individuals to holm oak have not been reported so far. In this work, we examined whether hybrids preferentially backcross with cork oak or with holm oak. To reach this goal, we genotyped by using eight microsatellite loci the progeny of four cork and four holm oak trees (33 and 44 half-siblings, respectively), and of four hybrids (468 half-siblings) collected over three years from a natural mixed population. We used the STRUCTURE software to estimate the proportion of the genotype of each seedling inherited from cork oak (q_s) or from holm oak (q_i). The ratio of the offspring q value over the mother q value helped determine the source of pollen that originated each acorn. Our results show for the first time that hybrid trees can be effectively pollinated by both parental species. Additionally, each hybrid tree was predominantly pollinated by the most abundant oak species in its vicinity. These results confirm the occurrence of bidirectional introgression, previously suggested for adult hybrid trees in the field, and point out the pattern of introgression in the seedlings could be most affected by the abundance of the parental species.

Keywords

Cork Oak, Holm Oak, Hybridization, Introgression, Microsatellites

Authors’ address

(1)

GI Genética, Fisiología e Historia Forestal, Dpto. Sistemas y Recursos Naturales, ETSI Montes, Forestal y del Medio Natural, Universidad Politécnica de Madrid, Madrid (Spain)

Corresponding author

Alvaro Soto
asdv00@gmail.com

Citation

López De Heredia U, Sánchez H, Soto A (2018). Molecular evidence of bidirectional introgression between Quercus suber and Quercus ilex. iForest 11: 338-343. - doi: 10.3832/ifor2570-011

Academic Editor

Piermaria Corona

Paper history

Received: Jul 28, 2017
Accepted: Feb 20, 2018

First online: Apr 18, 2018
Publication Date: Apr 30, 2018
Publication Time: 1.90 months

Open Access

This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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