Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2020 Nov 20;10(24):13990-13999.
doi: 10.1002/ece3.6992. eCollection 2020 Dec.

How rapidly do self-compatible populations evolve selfing? Mating system estimation within recently evolved self-compatible populations of Azorean Tolpis succulenta (Asteraceae)

Benjamin Kerbs  1 , Daniel J Crawford  1   2 , Griffin White  1   3 , Mónica Moura  4 , Lurdes Borges Silva  4 , Hanno Schaefer  5 , Keely Brown  1 , Mark E Mort  1 , John K Kelly  1
Affiliations

How rapidly do self-compatible populations evolve selfing? Mating system estimation within recently evolved self-compatible populations of Azorean Tolpis succulenta (Asteraceae)

Benjamin Kerbs et al. Ecol Evol. .

Abstract

Genome-wide genotyping and Bayesian inference method (BORICE) were employed to estimate outcrossing rates and paternity in two small plant populations of Tolpis succulenta (Asteraceae) on Graciosa island in the Azores. These two known extant populations of T. succulenta on Graciosa have recently evolved self-compatibility. Despite the expectation that selfing would occur at an appreciable rate (self-incompatible populations of the same species show low but nonzero selfing), high outcrossing was found in progeny arrays from maternal plants in both populations. This is inconsistent with an immediate transition to high selfing following the breakdown of a genetic incompatibility system. This finding is surprising given the small population sizes and the recent colonization of an island from self-incompatible colonists of T. succulenta from another island in the Azores, and a potential paucity of pollinators, all factors selecting for selfing through reproductive assurance. The self-compatible lineage(s) likely have high inbreeding depression (ID) that effectively halts the evolution of increased selfing, but this remains to be determined. Like their progeny, all maternal plants in both populations are fully outbred, which is consistent with but not proof of high ID. High multiple paternity was found in both populations, which may be due in part to the abundant pollinators observed during the flowering season.

Keywords: Tolpis succulenta; island colonization; mating systems; self‐incompatibility.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflict of interest.

Figures

FIGURE 1
FIGURE 1
Capitulum ofTolpis succulentaon Graciosa Island, visited by a small halictid bee (Halictus malachurus). Photo by H. Shaefer
FIGURE 2
FIGURE 2
Locality of two populations ofTolpis succulenta(GRSC and GRBL) on Graciosa island, within the central group of the Azorean archipelago
FIGURE 3
FIGURE 3
Posterior density for the overall outcrossing rate (t) across both populations
FIGURE 4
FIGURE 4
Individual offspring within the same rectangles are full sibs. Maternal family 1 has six sires, and families four and five have four sires. As shown in Table 1, the other five families have no full sibs
See this image and copyright information in PMC

References

    1. Anderson, G. J. , Bernardello, G. , Stuessy, T. F. , & Crawford, D. J. (2001). Breeding system and pollination of selected plants endemic to Juan Fernández Islands. American Journal of Botany, 88, 220 ‐ 233. - PubMed
    1. Andolfatto, P. , Davison, D. , Erezyilmaz, D. , Hu, T. T. , Mast, J. , Sunayama‐Morita, T. , & Stern, D. L. (2011). Multiplexed shotgun genotyping for rapid and efficient genetic mapping. Genome Research, 21, 610–617. 10.1101/gr.115402.110 - DOI - PMC - PubMed
    1. Arista, M. , Berjano, B. , Viruel, J. , Ortiz, M. A. , Talavera, M. , & Ortiz, P. L. (2017). Uncertain pollination environment promotes the evolution of a stable mixed reproductive system in the self‐incompatible Hypochaeris salzmanniana (Asteraceae). Annals of Botany, 120, 447–456. 10.1093/aob/mcx059 - DOI - PMC - PubMed
    1. Armbruster, P. , & Reed, D. H. (2006). Inbreeding depression in benign and stressful environments. Heredity, 95, 235–242. - PubMed
    1. Baldwin, S. J. , & Schoen, D. J. (2019). Inbreeding depression is difficult to purge in self‐incompatible populations of Leavenworthia alabamica . New Phytologist, 224, 1330–1338. - PubMed

LinkOut - more resources