Pollen competition between two sympatric <i><scp>O</scp>rchis</i> species (<scp>O</scp>rchidaceae): the overtaking of conspecific of heterospecific pollen as a reproductive barrier

Palermo, Anna Maria; Bellusci, Francesca; Pellegrino, Giuseppe

doi:10.1111/plb.12199

Cited by 8 publications

(5 citation statements)

References 48 publications

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“…Several studies have examined how post-pollination processes influence the degree of assortative mating and the strength of reproductive barriers between species (e.g., Rahmé et al, 2009;Widmer et al, 2009;Ostevik et al, 2016). Similar to the results of our study, conspecific pollen performance is higher than heterospecific performance in Ipomopsis arizonica (Wolf et al, 2001), sympatric Orchis species (Luca et al, 2015), Silene latifolia (Rahmé et al, 2009;Montgomery et al, 2010), Arabidopsis thaliana accession Columbia (Swanson et al, 2016), and some species of the Erica genus (Coetzee et al, 2020). In particular, Rahmé and colleagues (2009) found that when mixing equal proportions of pollen from compatible Silene latifolia and S. dioica species, the differential success of conspecific vs. heterospecific pollen revealed an asymmetric post-zygotic reproductive barrier toward hybrid formation.…”

Section: The Timing Of Pollination Can Reduce Assortative Mating and ...supporting

confidence: 87%

Pollen competition in hybridizingCakilespecies: How does a latecomer win the race?

Jalali

Rosinger

Hodgins

et al. 2022

American J of Botany

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Hybridization between cross-compatible species depends on the extent of competition between alternative mates. Even if stigmatic compatibility allows for hybridization, hybridization requires the heterospecific pollen to be competitive. Here, we determined whether conspecific pollen has an advantage in the race to fertilize ovules and the potential handicap to be overcome by heterospecific pollen in invasive Cakile species. Methods: We used fluorescence microscopy to measure pollen tube growth after conspecific and heterospecific hand-pollination treatments. We then determined siring success in the progeny relative to the timing of heterospecific pollen arrival on the stigma using CAPS markers. Results: In the absence of pollen competition, pollination time and pollen recipient species had a significant effect on the ratio of pollen tube growth. In long-styled C. maritima (outcrosser), pollen tubes grew similarly in both directions. In shortstyled C. edentula (selfer), conspecific and heterospecific pollen tubes grew differently. Cakile edentula pollen produced more pollen tubes, revealing the potential for a mating asymmetry whereby C. edentula pollen had an advantage relative to C. maritima. In the presence of pollen competition, siring success was equivalent when pollen deposition was synchronous. However, a moderate 1-h advantage in the timing of conspecific pollination resulted in almost complete assortative mating, while an equivalent delay in conspecific pollination resulted in substantial hybrid formation. Conclusions: Hybridization can aid the establishment of invasive species through the transfer of adaptive alleles from cross-compatible species, but also lead to extinction through demographic or genetic swamping. Time of pollen arrival on the stigma substantially affected hybridization rate, pointing to the importance of pollination timing in driving introgression and genetic swamping.

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Section: The Timing Of Pollination Can Reduce Assortative Mating and ...supporting

confidence: 87%

Pollen competition in hybridizingCakilespecies: How does a latecomer win the race?

Jalali

Rosinger

Hodgins

et al. 2022

American J of Botany

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“…; Luca et al . ) and Narcissus (Marques et al . , ), which reveals that our knowledge about the role of isolation barriers is poorly understood for most of the hybridising Mediterranean groups.…”

Section: Hybridisation and Polyploidy In The Mediterranean Regionmentioning

confidence: 99%

How much do we know about the frequency of hybridisation and polyploidy in the Mediterranean region?

et al. 2017

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Natural hybridisation and polyploidy are currently recognised as drivers of biodiversity, despite early scepticism about their importance. The Mediterranean region is a biodiversity hotspot where geological and climatic events have created numerous opportunities for speciation through hybridisation and polyploidy. Still, our knowledge on the frequency of these mechanisms in the region is largely limited, despite both phenomena are frequently cited in studies of Mediterranean plants. We reviewed information available from biodiversity and cytogenetic databases to provide the first estimates of hybridisation and polyploidy frequency in the Mediterranean region. We also inspected the most comprehensive modern Mediterranean Flora (Flora iberica) to survey the frequency and taxonomic distribution of hybrids and polyploids in Iberian Peninsula. We found that <6% of Mediterranean plants were hybrids, although a higher frequency was estimated for the Iberian Peninsula (13%). Hybrids were concentrated in few families and in even fewer genera. The overall frequency of polyploidy (36.5%) was comparable with previous estimates in other regions; however our estimates increased when analysing the Iberian Peninsula (48.8%). A surprisingly high incidence of species harbouring two or more ploidy levels was also observed (21.7%). A review of the available literature also showed that the ecological factors driving emergence and establishment of new entities are still poorly studied in the Mediterranean flora, although geographic barriers seem to play a major role in polyploid complexes. Finally, this study reveals several gaps and limitations in our current knowledge about the frequency of hybridisation and polyploidy in the Mediterranean region. The obtained estimates might change in the future with the increasing number of studies; still, rather than setting the complete reality, we hope that this work triggers future studies on hybridisation and polyploidy in the Mediterranean region.

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“…Generally, food‐deceptive orchid species (which exhibit weaker pollinator specificity than sexual‐deceptive species) rely on post‐mating isolation, such as hybrid sterility, as a reproductive barrier to avoid hybridization (Scopece et al 2007; Cozzolino & Scopece 2008). However, competition between conspecific and heterospecific pollen can operate as a post‐pollination pre‐zygotic barrier that limits the frequency of hybrid formation in nature (Luca et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Ecological factors affecting the fitness of the threatened orchid Anacamptis robusta (Orchidaceae): Habitat disturbance, interactions with a co‐flowering rewarding orchid and hybridization events

et al. 2020

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The food-deceptive species Anacamptis robusta is threatened in the Balearic Islands, and its habitat has recently been transformed through human disturbance. This study investigated how human disturbance affects the reproductive output of A. robusta and how its fitness is affected by competition with rewarding relatives, fungal infections and hybridization processes. • To evaluate the impact of habitat loss on plant fitness, data on reproductive measures were obtained in two well-conserved subpopulations and the unique disturbed subpopulation. Photo-trapping cameras were installed to determine the floral visitation rate. All flowering individuals in 2019 were georeferenced using differential GPS to examine the influence of geospatial patterns on the reproductive success of A. robusta. In addition, hand-pollination treatments were performed to evaluate the hybridization between A. coriophora and A. robusta and the origin of A. 9 albuferensis. • The human-disturbed subpopulation of A. robusta had a lower fruit set success than the subpopulations in well-conserved areas. The presence of A. coriophora is negatively affecting the reproductive output of A. robusta. Moreover, A. robusta can only act as the pollen donor during hybridization. • The complexity of the ecological system, which is enhanced by the strong pollinator dependence of the threatened species, must be considered when making conservation decisions. Although human disturbance directly affects plant population stability, other ecological issues must be considered, such as pollinator interaction, interspecific competition for pollinators, fungal infection and hybridization events.

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Pollen competition between two sympatric Orchis species (Orchidaceae): the overtaking of conspecific of heterospecific pollen as a reproductive barrier

Cited by 8 publications

References 48 publications

Pollen competition in hybridizingCakilespecies: How does a latecomer win the race?

Pollen competition in hybridizingCakilespecies: How does a latecomer win the race?

How much do we know about the frequency of hybridisation and polyploidy in the Mediterranean region?

Ecological factors affecting the fitness of the threatened orchid Anacamptis robusta (Orchidaceae): Habitat disturbance, interactions with a co‐flowering rewarding orchid and hybridization events

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