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Open AccessArticle

Self-Compatibility Not Associated with Morphological or Genetic Diversity Reduction in Oil-Rewarding Calceolaria Species

1
Centro GEMA, Genómica, Ecología y Medio Ambiente, Facultad de Estudios Interdisciplinarios, Universidad Mayor, Camino La Pirámide 5750, Santiago 8580745, Chile
2
Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Casilla 114-D, Santiago 8331150, Chile
3
Department of Entomology, Plant Sciences Building 3138, University of Maryland, College Park, MD 20742-4454, USA
*
Author to whom correspondence should be addressed.
These authors share last authorship.
Plants 2020, 9(10), 1377; https://doi.org/10.3390/plants9101377
Received: 20 August 2020 / Revised: 28 September 2020 / Accepted: 9 October 2020 / Published: 16 October 2020
(This article belongs to the Section Plant Ecology)
One of the most common evolutionary transitions in angiosperms is the reproductive change from outcrossing to selfing, commonly associated with changes in floral biology and genetic diversity. Here, we aim to test whether self-compatibility leads to a reduction of floral traits and genetic diversity. For this, we experimentally estimate levels of self-compatibility, measure three floral traits and estimate four genetic diversity parameters using nine microsatellites in nine Calceolaria species. Our analysis indicated that four of the study species were self-incompatible. In addition, we found that self-compatible species did not show a reduction in floral traits size, but rather displayed larger corolla and elaiophore areas. Our analyses of genetic diversity identified larger allele number and observed heterozygosity in selfers than in outcrossers, but did not find larger inbreeding in the self-compatible species. Even though our results contradict our expectations, in the case of Calceolaria, their high dependence on only two genera of oil-bees puts the genus in a vulnerable reproductive position, probably facilitating the evolution of reproductive assurance mechanisms in the absence of pollinators. As a result, plants maintain their pollinator attraction traits while evolving the ability to self, possibly in a delayed way. View Full-Text
Keywords: Calceolaria; self-incompatibility; Chile; specialized pollination; floral morphology; plant reproduction Calceolaria; self-incompatibility; Chile; specialized pollination; floral morphology; plant reproduction
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MDPI and ACS Style

Murúa, M.; Espíndola, A.; Pérez, F. Self-Compatibility Not Associated with Morphological or Genetic Diversity Reduction in Oil-Rewarding Calceolaria Species. Plants 2020, 9, 1377.

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