Journal
AMERICAN JOURNAL OF BOTANY
Volume 99, Issue 5, Pages 923-932Publisher
BOTANICAL SOC AMER INC
DOI: 10.3732/ajb.1100383
Keywords
autogamy; heterostyly; inbreeding depression; Oxalis alpina (Oxalidaceae); purging; self-incompatibility
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Funding
- University of California Institute for Mexico
- United States (UC MEXUS)
- CONACYT [47858-Q]
- Universidad Nacional Autonoma de Mexico [PAPIIT IN217803]
- National Science Foundation [DEB-0614164]
- GAANN
- University of California Irvine
- Office of Integrative Activities
- Office Of The Director [963441] Funding Source: National Science Foundation
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Premise of the study: Variation among individuals in levels of inbreeding depression associated with selfing levels could influence mating system evolution by purging deleterious alleles, but empirical evidence for this association is limited. Methods: We investigated the association of family-level inbreeding depression and presumed inbreeding history in a tristylous population of Oxalis alpina (Oxalidaceae). Key results: Mid-styled individuals possessed the greatest degree of self-compatibility (SC) and produced more autogamous capsules than short-or long-styled individuals. Offspring of highly self-compatible mid-styled individuals showed reduced inbreeding depression. Mid-styled plants that produced capsules autogamously exhibited reduced stigma-anther separation compared to mid-styled plants that produced no capsules autogamously. Reduced inbreeding depression was not correlated with stigma-anther separation, suggesting that self-compatibility and autogamy evolve before morphological changes in stigma-anther separation. Conclusions: Purging of inbreeding depression occurred in SC mid-styled maternal families. Low inbreeding depression in SC mid-styled plants may lead to retention of the mid-styled morph in populations, despite the occurrence of higher selfing rates in mid-styled relative to short-or long-styled morphs. Variation among individuals in levels of self-fertilization within populations may lead to associations between inbreeding lineages and lower levels of inbreeding depression, influencing the evolution of mating systems.
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