Illuminating the incredible journey of pollen

Anderson, Bruce; Minnaar, Corneile

doi:10.1002/ajb2.1539

Cited by 4 publications

(8 citation statements)

References 19 publications

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“…While a dearth in technology has made quantifications of pollen movement one of the least-studied aspects of pollination, 7,8 high outcrossing rates in handed plants suggest that handedness reduces pollen movement within multi-flowered plants. 5,6 Negative fitness costs associated with pollen movement within plants (e.g., inbreeding and incompatibility issues) are thought to have driven widespread spatial separation of anthers and stigmas across many angiosperm families.…”

Section: And Discussionmentioning

confidence: 99%

“…Clearly, the rates of self-pollen movement ($8%) and inbreeding depression in W. paniculata are not high enough to outweigh the advantages of having a stigmaside anther. The arrangement of anthers and stigmas in W. paniculata may also represent various bet-hedging strategies 8 to ensure that male and female function can contribute to overall plant fitness in a variety of pollination environments. For example, when carpenter bees visit flowers often, pollen movement will be dominated by upper anthers and result mostly in outcrossing.…”

Section: And Discussionmentioning

confidence: 99%

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A combination of pollen mosaics on pollinators and floral handedness facilitates the increase of outcross pollen movement

Minnaar

Anderson

2021

Current Biology

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Section: And Discussionmentioning

confidence: 99%

Section: And Discussionmentioning

confidence: 99%

A combination of pollen mosaics on pollinators and floral handedness facilitates the increase of outcross pollen movement

Minnaar

Anderson

2021

Current Biology

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“…This lack of space is one potential reason why pollen export may decrease with the amount of pollen removed by each pollinator and why flowers often dispense many small pollen loads instead of a few large pollen loads (Harder and Thomson, 1989). Inflorescence architecture, pollen‐dispensing strategies, and structures that brush existing pollen from pollinators may all be shaped in part by pollen landscapes and the competition for space by pollen grains from rival pollen donors (Minnaar et al, 2019a; Anderson and Minnaar, 2020). Despite the potentially important ecological and evolutionary consequences of pollen landscapes, their existence in flowers with granular pollen has not been verified by empirical studies.…”

Section: Figurementioning

confidence: 99%

Pollen layering and male–male competition: Quantum dots demonstrate that pollen grains compete for space on pollinators

Moir

Anderson

2023

American J of Botany

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Premise: Almost nothing is known about what happens to pollen grains once they attach to pollinators, although some have postulated that pollen from different donors may form complex, two-or three-dimensional landscapes (e.g., layers or mosaics) that can facilitate male-male competition. For example, pollen that is already on pollinators may preclude the deposition of subsequent pollen grains. Methods: Using quantum dots to mark the pollen of individual flowers, we explored the possibilities of layering and preclusion in a fly-pollinated iris, Moraea lurida. Results and Conclusions:The proportion of labeled pollen from the last flower visited diminished in sequential pollen samples taken from the top to the bottom of the pollen load, representing the first empirical evidence for pollen layering. However, the consequences in terms of pollen preclusion were equivocal: Although the preexisting pollen load size was not a good predictor of new pollen receipt, labeled pollen loads from the last flower visited were significantly smaller than pollen loads from the previous flower visited. Thus, pollen from the previous flower may preclude pollen placement from a subsequently visited flower, and pollen from different flowers may compete for space on pollinators.

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“…Future studies could then use novel pollen tracking techniques (see Anderson & Minnaar, 2020) to more fully understand patterns of reciprocal HP transfer between native and invasive species and its potential impacts on plant reproductive success. For instance, such techniques may allow to more quickly and accurately characterize patterns of pollen transfer among species, particularly in closely related species with strong similarities in pollen morphology.…”

Section: Invasive Plant Species Integration Into Plant–pollinator Networkmentioning

confidence: 99%

“…For instance, such techniques may allow to more quickly and accurately characterize patterns of pollen transfer among species, particularly in closely related species with strong similarities in pollen morphology. They may also allow to more precisely describe patterns of pollen movement as the location and number of pollen analogs can be manipulated (Anderson & Minnaar, 2020). Until now, only a couple of studies have evaluated HP transfer networks in invaded communities and both suggest important invasive species effects (Johnson & Ashman, 2018; Parra‐Tabla et al ., 2021).…”

Section: Invasive Plant Species Integration Into Plant–pollinator Networkmentioning

confidence: 99%

Impacts of plant invasions in native plant–pollinator networks

Parra-Tabla¹,

Arceo‐Gómez

2021

New Phytologist

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Summary The disruption of mutualisms by invasive species has consequences for biodiversity loss and ecosystem function. Although invasive plant effects on the pollination of individual native species has been the subject of much study, their impacts on entire plant–pollinator communities are less understood. Community‐level studies on plant invasion have mainly focused on two fronts: understanding the mechanisms that mediate their integration; and their effects on plant–pollinator network structure. Here we briefly review current knowledge and propose a more unified framework for evaluating invasive species integration and their effects on plant–pollinator communities. We further outline gaps in our understanding and propose ways to advance knowledge in this field. Specifically, modeling approaches have so far yielded important predictions regarding the outcome and drivers of invasive species effects on plant communities. However, experimental studies that test these predictions in the field are lacking. We further emphasize the need to understand the link between invasive plant effects on pollination network structure and their consequences for native plant population dynamics (population growth). Integrating demographic studies with those on pollination networks is thus key in order to achieve a more predictive understanding of pollinator‐mediated effects of invasive species on the persistence of native plant biodiversity.

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Illuminating the incredible journey of pollen

Cited by 4 publications

References 19 publications

A combination of pollen mosaics on pollinators and floral handedness facilitates the increase of outcross pollen movement

A combination of pollen mosaics on pollinators and floral handedness facilitates the increase of outcross pollen movement

Pollen layering and male–male competition: Quantum dots demonstrate that pollen grains compete for space on pollinators

Impacts of plant invasions in native plant–pollinator networks

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