Low levels of inbreeding depression and enhanced fitness in cleistogamous progeny in the annual plant<i>Triodanis perfoliata</i>

Ansaldi, Beth H.; Weber, Joseph T.; Goodwillie, Carol; Franks, Steven J.

doi:10.1139/cjb-2019-0022

Cited by 20 publications

(17 citation statements)

References 67 publications

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“…Dimorphic cleistogamy is thought to be an advantageous reproductive strategy that allows for plastic responses in sexual reproduction depending on the quality of pollination and abiotic resource environment ( e.g . Ansaldi et al 2019). In this study we found that cleistogamy expression in C. broussonetii is maximized in abiotically degraded frequently burned habitats from Chaco Serrano that apparently did not show depleted pollination fauna.…”

Section: Discussionmentioning

confidence: 98%

Fire frequency effects on cleistogamy expression and progeny performance inCologania broussonetii

2021

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Increased fire frequency usually erodes microenvironmental conditions, causing a drastic limitation of edaphic resources. Thus, the production of permanently closed‐small flowers (cleistogamous, CL) should increase in sites with high fire frequency as this implies a less expensive reproductive assurance strategy. However, because open, insect‐pollinated flowers (chasmogamous, CH) have the potential capacity to outcross via pollinators, CH progeny produced at any site should outperform selfed CL progeny. We evaluate the effect of fire frequency on the relative production of CL/CH flowers and fruits, and their seed set, along with several progeny performance parameters in Cologania broussonetii (Fabaceae), a resprouting herb with dimorphic cleistogamy native to the Chaco Serrano. Fire frequency increased cleistogamy expression, reaching extreme levels in high fire frequency sites. Seed set was similarly high for both CH and CL flowers in the unburned condition, while in burned sites the few developed CH flowers set more seeds than CL flowers. However, progeny performance was similar between CH and CL progeny at each and across all fire frequency conditions. Cleistogamy expression in C. broussonetii is maximized in abiotically degraded frequently burned habitats, although the selfed CL progeny is as successful as potentially outcrossed CH progeny. Fire frequency may decreased floral size and abundance, selecting for autogamous reproduction, which restricts not only the genetic potential of plant populations but also the resources offered to pollinators. At the community level, increased cleistogamy expression may potentially have negative implications for non‐cleistogamous, more outcrossing species surviving in frequently burned environments.

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Section: Discussionmentioning

confidence: 98%

Fire frequency effects on cleistogamy expression and progeny performance inCologania broussonetii

2021

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“…Self‐fertilization is common in flowering plants and frequently gives rise to inbreeding depression, defined as a reduction in the fitness of inbred relative to outbred offspring. Extensive work has documented effects of inbreeding on a wide range of fitness‐related plant traits, including growth and reproductive output through both the male (e.g., pollen production, pollen viability, pollen tube growth) and female (e.g., fruit and seed production) functions (Husband and Schemske, 1996; Jóhannsson et al, 1998; Ansaldi et al, 2019). Recent work has also begun exploring the ecological implications of inbreeding, including interactions among plants and other organisms (Stephenson et al, 2004; Carr and Eubanks, 2014; Kalske et al, 2014; Haber et al, 2018; Schrieber et al, 2018; Kariyat and Stephenson, 2019).…”

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confidence: 99%

Inbreeding in Solanum carolinense alters floral attractants and rewards and adversely affects pollinator visitation

Kariyat

Bentley

Nihranz

et al. 2021

American J of Botany

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Inbreeding depression is well documented in flowering plants and adversely affects a wide range of fitness-related traits. Recent work has begun to explore the effects of inbreeding on ecological interactions among plants and other organisms, including insect herbivores and pathogens. However, the effects of inbreeding on floral traits, floral scents, and pollinator visitation are less well studied. METHODS: Using inbred and outbred maternal families of horsenettle (Solanum carolinense, Solanaceae), we examined the effects of inbreeding on traits associated with pollinator attraction and floral rewards. Specifically, we measured corolla size, counted pollen grains per flower, and analyzed floral volatile emissions via gas chromatography and mass spectrometry. We also examined pollinator visitation to experimental arrays of flowering inbred and outbred plants under field conditions. RESULTS: Compared to those of outbred plants, flowers of inbred plants exhibited reduced corolla size and pollen production, as well as significantly reduced emission of the two most abundant volatile compounds in the floral blend. Furthermore, bumblebees-the main pollinators of horsenettle-discriminated against inbred flowers in the field: bees were more likely to make initial visits to flowers on outbred plants, visited outbred flowers more often overall, and spent more time on outbred flowers. CONCLUSIONS: These results show that inbreeding can (1) alter floral traits that are known to mediate pollinator attraction; (2) reduce the production of floral rewards (pollen is the sole reward in horsenettle); and (3) adversely affect pollinator visitation under field conditions.

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“…A mixed mating system in which both closed, obligate selfing cleistogamous (hereafter CL) flowers and open, facultatively outcrossing chasmogamous (hereafter CH) flowers are produced on the same individual, is a relatively widespread condition occurring in around 50 angiosperm families (Lord, 1981; Culley and Klooster, 2007). Compared to CH flowers, CL flowers are cheaper to produce, more reliable in terms of fruit set, and have higher seedling emergence (Baskin and Baskin, 2017; Ansaldi et al, 2019). Cleistogamy has evolved independently multiple times (Desfeux et al, 1996), and there are few, if any, documented cases of loss of the CH flowers.…”

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confidence: 99%

“…Cleistogamy has evolved independently multiple times (Desfeux et al, 1996), and there are few, if any, documented cases of loss of the CH flowers. This peculiar reproductive strategy, and why it is maintained, has puzzled biologists for a long time, and continues to do so because it goes against the prediction that mixed mating is not evolutionarily stable (Goodwillie et al, 2005; Oakley and Winn, 2008; Winn and Moriuchi, 2009; Ansaldi et al, 2019; Furukawa et al, 2020). Yet, experimental studies have revealed certain conditions (e.g., pollen limitation) that would allow mixed mating systems to be evolutionarily stable (Albert et al, 2011; Stojanova et al, 2020).…”

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confidence: 99%

Selective forces on the maintenance of outcrossing in an almost exclusively cleistogamous violet species

Seguí

Hervías‐Parejo

Traveset

2021

American J of Botany

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Premise Cleistogamous species constitute interesting study systems to resolve the longstanding question of how outcrossing is maintained given that seed production is ensured through selfing. In this work, we investigate the selective forces that allow the persistence of producing self‐pollinated cleistogamous (CL) and chasmogamous (CH) flowers in Viola jaubertiana Marès & Vigin. Methods We monitored three populations at different elevation for two years, and studied the flowering phenology and the relative contribution of each flower morph to parental fitness. We tested whether allocation to CH and CL flowers differed across populations and if it covaried with herbivory and water stress conditions. We also performed hand‐pollination and bagging experiments in CH flowers to estimate inbreeding depression and heterosis. Results The CH flowers open in winter under unfavorable conditions for pollination, show high pollen limitation and no‐delayed selfing, and thus produce a low amount of seeds. Conversely, CL flowers appear in early spring, are physiologically cheaper to produce (i.e., dry weight is 3.4 times lower than that of CH flowers), and yield approximately 100 times more seeds than CH flowers. The CH flowers were favored under water stress and low herbivory. Crosses between populations showed up to 25% greater fitness than those within populations. Conclusions Despite the great pollen limitation in CH flowers, we suggest that the interaction among different environmental determinants and heterosis are probably sufficient forces to maintain chasmogamy in this long‐lived species, reducing deleterious fixed mutations in the selfed lines.

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Low levels of inbreeding depression and enhanced fitness in cleistogamous progeny in the annual plantTriodanis perfoliata

Cited by 20 publications

References 67 publications

Fire frequency effects on cleistogamy expression and progeny performance inCologania broussonetii

Fire frequency effects on cleistogamy expression and progeny performance inCologania broussonetii

Inbreeding in Solanum carolinense alters floral attractants and rewards and adversely affects pollinator visitation

Selective forces on the maintenance of outcrossing in an almost exclusively cleistogamous violet species

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