Pollen transport: Illuminating a key mechanism of disassortative pollination

Karron, Jeffrey D.; Christopher, Dorothy A; Semski, Wendy R.

doi:10.1016/j.cub.2021.05.050

Cited by 3 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, ovules are protected within the ovary and, excepting cases of flower predation or abiotic stresses, their fate is mainly determined by the quantity and quality of the pollen received on a flower's stigma and available resources to mature seeds and fruits (Harder and Routley, 2006). Because of such disparate uncertainties (Wilson et al, 1994), pollen grains frequently outnumber ovules by several orders of magnitude, and different flower traits can be subjected to strong male‐biased selection for increasing pollen export (Minnaar et al, 2019; Karron et al, 2021), including floral display size (Sutherland and Delph, 1984; Sutherland, 1987; Campbell, 1989) and pollen production itself (Cruden, 2000; Cunha et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…Our results suggest a link between floral display size and per‐flower pollen production that can be interpreted within the framework of massive pollen losses occurring during the transport of pollen from anthers to stigmas, which in animal‐pollinated flowering plants averages 98.4%, ranging between 51.65 and 99.99% (N. L. da Cunha and M. A. Aizen, unpublished data). Also, the evolutionary effect on pollen production of these pollen transfer losses (Morgan, 1992; Harder and Wilson, 1998; Karron et al, 2021) and post‐pollination pollen mortality due to pistil rejection (Swanson et al, 2004; Broz and Bedinger, 2021) can be observed in the average 20% difference in the number of pollen grains produced by the flowers of self‐compatible vs. self‐incompatible species (Appendix S1, Figure S2B), which can be attributed to differences in self‐pollination and selfing capacity (Hirayama et al, 2005; Brys et al, 2016; Harder and Johnson, 2023 [this issue]). While plants with larger floral displays may benefit from increasing pollinator attraction, they pay the cost of increasing geitonogamous pollination and thus increasing pollen discounting (Barrett et al, 1996; Harder and Wilson, 1998).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Pollen production per flower increases with floral display size across animal‐pollinated flowering plants

Cunha

Aizen

2023

American J of Botany

View full text Add to dashboard Cite

Premise:The number of open flowers on a plant (i.e., floral display size) can influence plant fitness by increasing pollinator attraction. However, diminishing marginal fitness returns with increasing floral display are expected as pollinators tend to visit more flowers per plant consecutively. An extended flower visitation sequence increases the fraction of ovules disabled by self-pollination (ovule discounting) and reduces the fraction of a plant's own pollen that is exported to sire seeds in other plants (pollen discounting). Hermaphroditic species with a genetic system that prevents self-fertilization (self-incompatibility) would avoid ovule discounting and its fitness cost, whereas species without such a genetically based barrier would not. Contrarily, pollen discounting would be an unavoidable consequence of a large floral display irrespective of selfing barriers. Nevertheless, the increasing fitness costs of ovule and pollen discounting could be offset by respectively increasing ovule and pollen production per flower. Methods: We compiled data on floral display size and pollen and ovule production per flower for 1241 animal-pollinated, hermaphroditic angiosperm species, including data on the compatibility system for 779 species. We used phylogenetic general linear mixed models to assess the relations of pollen and ovule production to floral display size. Results: Our findings provide evidence of increasing pollen production, but not of ovule production, with increasing display size irrespective of compatibility system and even after accounting for potentially confounding effects like flower size and growth form. Conclusions: Our comparative study supports the pollen-discount expectation of an adaptive link between per-flower pollen production and floral display across animalpollinated angiosperms.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Pollen production per flower increases with floral display size across animal‐pollinated flowering plants

Cunha

Aizen

2023

American J of Botany

View full text Add to dashboard Cite

show abstract

Phosphoproteomic analysis of distylous Turnera subulata identifies pathways related to endoreduplication that correlate with reciprocal herkogamy

Henning,

Minkoff,

Sussman

2024

American J of Botany

View full text Add to dashboard Cite

PremiseA multi‐omic approach was used to explore proteins and networks hypothetically important for establishing filament dimorphisms in heterostylous Turnera subulata (Sm.) as an exploratory method to identify genes for future empirical research.MethodsMass spectrometry (MS) was used to identify differentially expressed proteins and differentially phosphorylated peptides in the developing filaments between the L‐ and S‐morphs. RNAseq was used to generate a co‐expression network of the developing filaments, MS data were mapped to the co‐expression network to identify hypothetical relationships between the S‐gene responsible for filament dimorphisms and differentially expressed proteins.ResultsMapping all MS identified proteins to a co‐expression network of the S‐morph's developing filaments identified several clusters containing SPH1 and other differentially expressed or phosphorylated proteins. Co‐expression analysis clustered CDKG2, a protein that induces endoreduplication, and SPH1—suggesting a shared biological function. MS analysis suggests that the protein is present and phosphorylated only in the S‐morph, and thus active only in the S‐morph. A series of CDKG2 regulators, including ATM1, and cell cycle regulators also correlated with the presence of reciprocal herkogamy, supporting our interest in the protein.ConclusionsThis work has built a foundation for future empirical work, specifically supporting the role of CDKG2 and ATM1 in promoting filament elongation in response to SPH1 perception.

show abstract

Understanding complex mirror-image flowers – a commentary on: ‘The enantiostylous floral polymorphism of Barberetta aurea (Haemodoraceae) facilitates wing pollination by syrphid flies’

Huang

2023

Annals of Botany

View full text Add to dashboard Cite

show abstract

Pollen transport: Illuminating a key mechanism of disassortative pollination

Cited by 3 publications

References 19 publications

Pollen production per flower increases with floral display size across animal‐pollinated flowering plants

Pollen production per flower increases with floral display size across animal‐pollinated flowering plants

Phosphoproteomic analysis of distylous Turnera subulata identifies pathways related to endoreduplication that correlate with reciprocal herkogamy

Understanding complex mirror-image flowers – a commentary on: ‘The enantiostylous floral polymorphism of Barberetta aurea (Haemodoraceae) facilitates wing pollination by syrphid flies’

Contact Info

Product

Resources

About