Demography, genetic diversity and expansion load in the colonizing species Leontodon longirostris (Asteraceae) throughout its native range
Pedro, Manuel de (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Riba Rovira, Miquel (Centre de Recerca Ecològica i d'Aplicacions Forestals)
González-Martínez, Santiago C. (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Seoane, Pedro (Instituto de Investigación Biomédica de Málaga)
Bautista Moreno, Rocío (Instituto de Investigación Biomédica de Málaga)
Gonzalo Claros, M. (Instituto de Investigación Biomédica de Málaga)
Mayol, Maria (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2021
Resum:	Unravelling the evolutionary processes underlying range expansions is fundamental to understand the distribution of organisms, as well as to predict their future responses to environmental change. Predictions for range expansions include a loss of genetic diversity and an accumulation of deleterious alleles along the expansion axis, which can decrease fitness at the range-front (expansion load). In plants, empirical studies supporting expansion load are scarce, and its effects remain to be tested outside a few model species. Leontodon longirostris is a colonizing Asteraceae with a widespread distribution in the Western Mediterranean, providing a particularly interesting system to gain insight into the factors that can enhance or mitigate expansion load. In this study, we produced a first genome draft for the species, covering 418 Mbp (~53% of the genome). Although incomplete, this draft was suitable to design a targeted sequencing of ~1. 5 Mbp in 238 L. longirostris plants from 21 populations distributed along putative colonization routes in the Iberian Peninsula. Inferred demographic history supports a range expansion from southern Iberia around 40,000 years ago, reaching northern Iberia around 25,000 years ago. The expansion was accompanied by a loss of genetic diversity and a significant increase in the proportion of putatively deleterious mutations. However, levels of expansion load in L. longirostris were smaller than those found in other plant species, which can be explained, at least partially, by its high dispersal ability, the self-incompatible mating system, and the fact that the expansion occurred along a strong environmental cline.
Ajuts:	Ministerio de Economía y Competitividad CGL2014-53120-P Ministerio de Economía y Competitividad RTA2017-00054-C03-03 Ministerio de Economía y Competitividad TIN2017-88728-C2-1-R Ministerio de Economía y Competitividad AGL2017-83370-C3-3-R Ministerio de Economía y Competitividad BES-2015-074251 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1006
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Molecular ecology, Vol. 30, issue 5 (March 2021) , p. 1190-1205, ISSN 1365-294X

DOI: 10.1111/mec.15802
PMID: 33452714

Postprint 46 p, 827.2 KB

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