Natural Selection Acts on Floral Traits Associated with Selfing Rate among Populations of Mixed-Mating <i>Collinsia heterophylla</i> (Plantaginaceae)

Strandh, Maria; Jönsson, Jörgen; Madjidian, Josefin A.; Hansson, Bengt; Lankinen, Åsa

doi:10.1086/693464

Cited by 11 publications

(19 citation statements)

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“…The floral and life‐history changes that constitute the selfing syndrome are potentially distinct from morphological and physiological changes that directly affect selfing, such as reduced herkogamy and loss of self‐incompatibility. Although these associated floral and life‐history changes have been observed in a wide range of taxa, and various selective explanations have been proposed for them, there have been few attempts to determine whether selection is indeed responsible for these changes (Duncan & Rausher, ; Strandh et al, ). Genetic drift is also a plausible explanation for these differences.…”

Section: Discussionmentioning

confidence: 99%

“…The floral and life-history changes that constitute the selfing syndrome are potentially distinct from morphological and physiological changes that directly affect selfing, such as reduced herkogamy have been few attempts to determine whether selection is indeed responsible for these changes (Duncan & Rausher, 2013a;Strandh et al, 2017). Genetic drift is also a plausible explanation for these differences.…”

Section: The Role Of Selection On Selfing-syndrome Traitsmentioning

confidence: 99%

“…Two recent studies-on corolla size in the morning glories Ipomoea lacunosa and Ipomoea cordatotriloba (Duncan & Rausher, 2013a) and flower size in Collinsia heterophylla (Strandh, Jönsson, Madjidian, Hansson, & Lankinen, 2017)-indicated a role for natural selection in the divergence of both floral and reproductive traits. Neither, however, included elements of the selfing syndrome outside of floral dimensions, such as nectar, pollen, or growth traits.…”

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confidence: 99%

“…Studies of selection on self-pollination have estimated current levels of inbreeding depression, pollen discounting, and seed discounting (Busch & Delph, 2012;Husband & Schemske, 1996;Layman, Fernando, Herlihy, & Busch, 2017;Rausher, Augustine, & Vanderkooi, 1993), and whether selfing is favored in conditions of pollen or pollinator limitation (Briscoe Runquist, Geber, Pickett-Leonard, & Moeller, 2017;Fishman & Willis, 2008;Gervasi & Schiestl, 2017;Moeller & Geber, 2005;Roels & Kelly, 2011;Strandh et al, 2017;Toräng et al, 2017). However, we know of fewer direct demonstrations of overall selection favoring selfing, although a recent study in Leavenworthia found molecular signatures consistent with positive selection on the S-locus (Herman & Schoen, 2016).…”

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confidence: 99%

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Multiple aspects of the selfing syndrome of the morning glory Ipomoea lacunosa evolved in response to selection: A Qst‐Fst comparison

Rifkin

Liao

Castillo

et al. 2019

Ecology and Evolution

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The frequent transition from outcrossing to selfing in flowering plants is often accompanied by changes in multiple aspects of floral morphology, termed the “selfing syndrome.” While the repeated evolution of these changes suggests a role for natural selection, genetic drift may also be responsible. To determine whether selection or drift shaped different aspects of the pollination syndrome and mating system in the highly selfing morning glory Ipomoea lacunosa , we performed multivariate and univariate Qst‐Fst comparisons using a wide sample of populations of I. lacunosa and its mixed‐mating sister species Ipomoea cordatotriloba . The two species differ in early growth, floral display, inflorescence traits, corolla size, nectar, and pollen number. Our analyses support a role for natural selection driving trait divergence, specifically in corolla size and nectar traits, but not in early growth, display size, inflorescence length, or pollen traits. We also find evidence of selection for reduced herkogamy in I. lacunosa , consistent with selection driving both the transition in mating system and the correlated floral changes. Our research demonstrates that while some aspects of the selfing syndrome evolved in response to selection, others likely evolved due to drift or correlated selection, and the balance between these forces may vary across selfing species.

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Section: Discussionmentioning

confidence: 99%

Section: The Role Of Selection On Selfing-syndrome Traitsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Multiple aspects of the selfing syndrome of the morning glory Ipomoea lacunosa evolved in response to selection: A Qst‐Fst comparison

Rifkin

Liao

Castillo

et al. 2019

Ecology and Evolution

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“…These floral traits also appear to be associated with slower plant developmental rate and later flowering start (Elle et al 2010). In C. heterophylla , variation in outcrossing rate is substantial and populations with higher outcrossing rates have later timing of stigma receptivity (Strandh et al 2017). In line with the results at the genus level, delayed selfing measured as timing of anther-stigma contact was shown to be genetically correlated with timing of stigma receptivity, and tended to be genetically correlated with flowering start (Lankinen et al 2017a).…”

Section: Introductionmentioning

confidence: 99%

Can Sexual Selection Cause Divergence in Mating System-Related Floral Traits?

Lankinen

Strandh

2019

Preprint

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Premise of the Research: The wide diversity of floral traits seen among plants is shaped by neutral and selective evolutionary processes. In outcrossing species, sexual selection from competing pollen donors is expected to be important for shaping mating system-related traits but empirical evidence is scarce. In a previous evaluation of experimental evolution lines crossed with either one or two pollen donors (monogamous, M, or polyandrous, P, lines) at early floral stages in mixed-mating Collinsia heterophylla (Plantaginaceae), P showed enhanced pollen competitive ability and reduced maternal seed set compared to M, in accordance with sexually antagonistic evolution of pollen. Here, we asked whether the presence of sexual selection during pollen competition affect mating system-related floral traits in the same lines. Methodology: We compared flowering start, timing of anther-stigma contact (as an indication of timing of self-pollination), timing of stigma receptivity and first seed set between M and P, and with a source line, S (starting material). The former three traits are later in outcrossers than in selfers of Collinsia. The latter trait was expected to be earlier in P than in M because of sexual selection for early seed siring of pollen. Pivotal Results: Artificial polyandry for four generations resulted in later flowering start and later anther-stigma contact in P compared to M, and the latter trait was intermediate in S. Thus, P appeared more 'outcrossing' than M. Stigma receptivity did not differ between lines. First seed set was earlier in P than in M, as expected from sexual selection. Conclusions: Our results from C. heterophylla experimental evolution lines suggest that a component of sexual selection during outcross pollination could enhance the patterns of floral divergence commonly found between outcrossers and selfers.

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Drought and temperature stresses impact pollen production and autonomous selfing in a California wildflower, Collinsia heterophylla

Arathi

2023

Ecology and Evolution

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Ongoing climatic changes have altered growing conditions for plants by limiting water availability and inducing unprecedented temperature increases, eliciting plant functional responses that compromise floral trait expression, reduce pollen production and promote early self-pollination. In a controlled greenhouse study, plants of Collinsia heterophylla, an annual mixed-mated hermaphrodite, were grown under temperature and water stresses. Floral trait responses and related effects on plant reproductive success were recorded. Plants grown under temperature and water stresses were shorter and had fewer leaves at flowering than control plants. Temperature-stressed plants flowered earlier and had smaller flowers that produced fewer per capita pollen grains than control and water-stressed plants. While lifetime flower production in plants experiencing temperature stress alone or water stress alone was similar to control plants, those receiving combined temperature and water stresses had significantly lower lifetime flower production. Abiotic stress did not affect investment in female traits such as ovule number per flower, but impacted male traits seen as fewer pollen grains per flower. In plants experiencing abiotic stress, an increase in autonomous self-pollination was facilitated through a compromise in herkogamy, a sexual interference mechanism that promotes cross-pollination. Spatial separation between stigma and anther, a measure of herkogamy was zero or negative in stressed plants. Thus, abiotic stress responses in plants did not compromise plant reproductive success as autonomous selfing was augmented. In nature, such responses will likely reduce available nutrition for pollinators through decreased flower and pollen production.

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Natural Selection Acts on Floral Traits Associated with Selfing Rate among Populations of Mixed-Mating Collinsia heterophylla (Plantaginaceae)

Cited by 11 publications

References 81 publications

Multiple aspects of the selfing syndrome of the morning glory Ipomoea lacunosa evolved in response to selection: A Qst‐Fst comparison

Multiple aspects of the selfing syndrome of the morning glory Ipomoea lacunosa evolved in response to selection: A Qst‐Fst comparison

Can Sexual Selection Cause Divergence in Mating System-Related Floral Traits?

Drought and temperature stresses impact pollen production and autonomous selfing in a California wildflower, Collinsia heterophylla

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