RESPONSE TO SELECTION ON AUTOGAMY IN
            <i>PHLOX</i>

Bixby, Paul J.; Levin, Donald A.

doi:10.1111/j.1558-5646.1996.tb03897.x

Cited by 32 publications

(29 citation statements)

References 36 publications

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Section: Genetic Mechanisms Of Self-incompatibility Breakdownmentioning

confidence: 99%

“…Modulators of SI expression segregating at loci distinct from the S-locus have been detected in many plants spanning a wide taxonomic range (reviewed by Levin 1996). Levin (1996) has suggested that many transitions from SI to SC may have arisen through genetic changes at modifier loci rather than at the S-locus itself. The modulation of S-locus expression by unlinked genes has been characterized in model systems of both SSI and GSI (reviewed by McClure et al 2000;Cruz-García et al 2003).…”

Section: Genetic Mechanisms Of Self-incompatibility Breakdownmentioning

confidence: 99%

“…An increasing body of evidence suggests that rejection of incompatible pollen represents a quantitative, rather than qualitative, trait. Plants derived from natural Phlox populations responded rapidly to two cycles of artificial selection favoring increases or decreases in autogamous fruiting (Bixby and Levin 1996). Good-Á vila and Stephenson (2002) detected heritable variation for increasing self-fertility with flower age in Campanula rapunculoides.…”

Section: Genetic Mechanisms Of Self-incompatibility Breakdownmentioning

confidence: 99%

“…An intriguing question concerns whether incomplete expression of SI represents an evolutionarily stable state rather than a transient condition between complete expression and complete breakdown of SI (Levin 1996;Stephenson et al 2000). In particular, the history of duplication or polyploidization in C. rapunculoides suggested by allozyme segregation patterns (Vogler and Stephenson 2001) may indicate that partial breakdown of SI in this species merely represents a by-product of the duplication of part of the S-locus.…”

Section: Evolutionary Significance Of Incomplete Self-incompatibilitymentioning

confidence: 99%

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On the Evolutionary Costs of Self-Incompatibility: Incomplete Reproductive Compensation Due to Pollen Limitation

Vallejo‐Marín

Uyenoyama

2004

Evolution

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Pollen limitation affects plants with diverse reproductive systems and ecologies. In self-incompatible (SI) species, pollen limitation may preclude full reproductive compensation for prezygotic rejection of pollen. We present a model designed to explore the effects of incomplete reproductive compensation on evolutionary changes at a modifier locus that regulates the level of SI expression. Our results indicate that incomplete reproductive compensation greatly increases the evolutionary costs of SI, particularly in populations with low S-allele diversity. The evolutionary fate of modifiers of SI expression depends on the rate at which they are transmitted to future generations as well as the effects of SI on offspring number and quality. Partial SI expression can represent a stable condition rather than an evolutionarily transient state between full expression and full suppression. This unanticipated result provides the first theoretical support for the evolutionary stability of such mixed mating systems, the existence of which has recently been documented.

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Section: Genetic Mechanisms Of Self-incompatibility Breakdownmentioning

confidence: 99%

Section: Genetic Mechanisms Of Self-incompatibility Breakdownmentioning

confidence: 99%

Section: Genetic Mechanisms Of Self-incompatibility Breakdownmentioning

confidence: 99%

Section: Evolutionary Significance Of Incomplete Self-incompatibilitymentioning

confidence: 99%

See 2 more Smart Citations

On the Evolutionary Costs of Self-Incompatibility: Incomplete Reproductive Compensation Due to Pollen Limitation

Vallejo‐Marín

Uyenoyama

2004

Evolution

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“…Also, progeny array analysis revealed a heterogeneous selfing rate among families. Reproductive systems are known to respond rapidly to selection (Henny & Ascher, 1976), Petunia integrifolia (Dana & Ascher, 1985) and Phlox drummondii (Levin, 1995;Bixby & Levin, 1996). Furthermore, Good-Avila & Stephenson (2002) report inheritance of modifiers conferring self-fertility in the partially self-incompatible perennial, Camapanula rapunculoides L. (Campanulaceae).…”

Section: Factors Influencing Mating System Evolutionmentioning

confidence: 99%

Mating system variation along a successional gradient in the allogamous and colonizing plant Crepis sancta (Asteraceae)

Cheptou

Lepart

Escarré

2002

Journal of Evolutionary Biology

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We analysed mating system in an annual and colonizing plant, Crepis sancta, that occupies different successional stages in the French Mediterranean region. Based on a previous experiment, we hypothesized that low inbreeding depression measured in young successional stages should select for selfing whereas higher inbreeding depression in old stages should select for outcrossing. Nine populations of C. sancta (Asteraceae) from contrasting successional stages were used to analyse (1) Seed set after autonomous and enforced selfing in controlled conditions and (2) outcrossing rates in natural conditions using allozymes (progeny array analysis). We found that C. sancta possesses a pseudo-self-incompatibility system and that mating system varies among populations. Allozymes revealed that the population multilocus outcrossing rates vary from 0.77 to 0.99. The lowest outcrossing rates occur in the youngest successional stages and complete outcrossing is found in old stages. The data partially agree with the predictions we made and the results are more generally discussed in the light of factors changing during succession. We did not find any evidence of reproductive assurance in the nine populations, contrary to what is often assumed as a major factor governing mating system evolution in colonizing species. We propose that mating system variation can be interpreted as the result of the balance between the cost of outcrossing and inbreeding depression in a metapopulation context.

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How early does the selfing syndrome arise? Associations between selfing ability and flower size within populations of the mixed‐mater Collinsia verna

McElderry

Spigler

Vogler

et al. 2022

American J of Botany

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Premise: Widespread associations between selfing rate and floral size within and among taxa suggest that these traits may evolve in concert. Does this association develop immediately because of shared genetic and/or developmental control, or stepwise with selection shaping the evolution of one trait following the other? If the former, then association ought to appear within and across selfing populations. We explore this fundamental question in three populations of the mixed-mater Collinsia verna where autonomous selfing (AS) ability has been shown to be under selection by the pollination environment. Methods: We grew clonal replicates of C. verna in a controlled environment to characterize broad-sense genetic correlations among traits within populations and to assess whether divergence in mating system and floral traits among these populations is consistent with their previously observed selection pressures. Results: As predicted by their respective pollination environments, we demonstrate significant genetic divergence among populations in AS ability. However, patterns of divergence in floral traits (petal, stamen, and style size, stigmatic receptivity, and stigma-anther distance) were not as expected. Within populations, genetic variation in AS appeared largely independent from floral traits, except for a single weak negative association in one population between flower size and AS rate. Conclusions: Together, these results suggest that associations between selfing rate and floral traits across Collinsia species are not reflected at microevolutionary scales. If C. verna were to continue evolving toward the selfing syndrome, floral trait evolution would likely follow stepwise from mating system evolution.

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RESPONSE TO SELECTION ON AUTOGAMY IN PHLOX

Cited by 32 publications

References 36 publications

On the Evolutionary Costs of Self-Incompatibility: Incomplete Reproductive Compensation Due to Pollen Limitation

On the Evolutionary Costs of Self-Incompatibility: Incomplete Reproductive Compensation Due to Pollen Limitation

Mating system variation along a successional gradient in the allogamous and colonizing plant Crepis sancta (Asteraceae)

How early does the selfing syndrome arise? Associations between selfing ability and flower size within populations of the mixed‐mater Collinsia verna

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