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Am J Bot

Title:		Evolution of selfing syndrome and its influence on genetic diversity and inbreeding: A range-wide study in Oenothera primiveris
Author(s):		Cisternas-Fuentes A; Jogesh T; Broadhead GT; Raguso RA; Skogen KA; Fant JB;
Address:		"Negaunee Institute for Plant Conservation Science and Action, Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, Illinois, 60035, USA. Plant Biology and Conservation, Northwestern University, 2205 Tech Drive, Evanston, Illinois, 60208, USA. Department of Biological Science, Clemson University, 132 Long Hall, Clemson, South Carolina, 29631, USA. Department of Entomology and Nematology, University of Florida, 1881 Natural Area Drive, Gainesville, Florida, 32611, USA. Department of Neurobiology and Behavior, Cornell University, W361 Mudd Hall, Ithaca, New York, 14853, USA"
Journal Title:		Am J Bot
Year:		2022
Volume:		20220521
Issue:		5
Page Number:		789 - 805
DOI:		10.1002/ajb2.1861
ISSN/ISBN:		1537-2197 (Electronic) 0002-9122 (Print) 0002-9122 (Linking)
Abstract:		"PREMISE: To avoid inbreeding depression, plants have evolved diverse breeding systems to favor outcrossing, such as self-incompatibility. However, changes in biotic and abiotic conditions can result in selective pressures that lead to a breakdown in self-incompatibility. The shift to increased selfing is commonly associated with reduced floral features, lower attractiveness to pollinators, and increased inbreeding. We tested the hypothesis that the loss of self-incompatibility, a shift to self-fertilization (autogamy), and concomitant evolution of the selfing syndrome (reduction in floral traits associated with cross-fertilization) will lead to increased inbreeding and population differentiation in Oenothera primiveris. Across its range, this species exhibits a shift in its breeding system and floral traits from a self-incompatible population with large flowers to self-compatible populations with smaller flowers. METHODS: We conducted a breeding system assessment, evaluated floral traits in the field and under controlled conditions, and measured population genetic parameters using RADseq data. RESULTS: Our results reveal a bimodal transition to the selfing syndrome from the west to the east of the range of O. primiveris. This shift includes variation in the breeding system and the mating system, a reduction in floral traits (flower diameter, herkogamy, and scent production), a shift to greater autogamy, reduced genetic diversity, and increased inbreeding. CONCLUSIONS: The observed variation highlights the importance of range-wide studies to understand breeding system variation and the evolution of the selfing syndrome within populations and species"
Keywords:		Flowers/genetics Genetic Variation Inbreeding *Oenothera Plant Breeding Pollination Reproduction/genetics Self-Fertilization Onagraceae RADseq breeding system genetic diversity mating system self-incompatibility;
Notes:		"MedlineCisternas-Fuentes, Anita Jogesh, Tania Broadhead, Geoffrey T Raguso, Robert A Skogen, Krissa A Fant, Jeremie B eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2022/05/22 Am J Bot. 2022 May; 109(5):789-805. doi: 10.1002/ajb2.1861. Epub 2022 May 21"