A first test of elemental allelopathy via heterospecific pollen receipt

Wipf, Heidi M.-L.; Meindl, George A.; Ashman, Tia‐Lynn

doi:10.3732/ajb.1500187

Cited by 11 publications

(6 citation statements)

References 72 publications

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“…Interactions between HP and CP grains on the stigma, or tubes within the recipient style, can also influence the quality of pollination. Heterospecific pollen can reduce CP tubes as a result of allelochemical or physical interference (Morales and Traveset, 2008;Ashman and Arceo-Gómez, 2013;Wipf et al, 2016;Takemori et al, 2019). Heterospecific pollen can sometimes lead to increased seed production (Arceo-Gómez et al, 2019;Suárez-Mariño et al, 2019), possibly reflecting increased CP tubes/grain as a result of the 'herd' or 'mentor'-like effect (as in CP; Cruzan, 1990;Niesenbaum, 1999).…”

Section: Processes That Underlie Cp Tubes/grain-hp Relationshipsmentioning

confidence: 99%

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Pollen on stigmas as proxies of pollinator competition and facilitation: complexities, caveats and future directions

et al. 2020

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Background Pollen transfer via animals is necessary for reproduction by ~80 % of flowering plants, and most of these plants live in multispecies communities where they can share pollinators. While diffuse plant–pollinator interactions are increasingly recognized as the rule rather than the exception, their fitness consequences cannot be deduced from flower visitation alone, so other proxies, functionally closer to seed production and amenable for use in a broad variety of diverse communities, are necessary. Scope We conceptually summarize how the study of pollen on stigmas of spent flowers can reflect key drivers and functional aspects of the plant–pollinator interaction (e.g. competition, facilitation or commensalism). We critically evaluate how variable visitation rates and other factors (pollinator pool and floral avoidance) can give rise to different relationships between heterospecific pollen and (1) conspecific pollen on the stigma and (2) conspecific tubes/grain in the style, revealing the complexity of potential interpretations. We advise on best practices for using these proxies, noting the assumptions and caveats involved in their use, and explicate what additional data are required to verify interpretation of given patterns. Conclusions We conclude that characterizing pollen on stigmas of spent flowers provides an attainable indirect measure of pollination interactions, but given the complex processes of pollen transfer that generate patterns of conspecific–heterospecific pollen on stigmas these cannot alone determine whether competition or facilitation are the underlying drivers. Thus, functional tests are also needed to validate these hypotheses.

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Section: Processes That Underlie Cp Tubes/grain-hp Relationshipsmentioning

confidence: 99%

“…spermidine; Palmer-Young et al, 2019) when HP germinates or bursts on the stigma (e.g. Prieu et al, 2016;Wipf et al, 2016). In multispecies loads of HP, antagonistic effects between HP grains can lead to non-additive effects on CP performance (Arceo-Gómez and Ashman, 2011).…”

Section: Processes That Underlie Cp Tubes/grain-hp Relationshipsmentioning

confidence: 99%

Pollen on stigmas as proxies of pollinator competition and facilitation: complexities, caveats and future directions

et al. 2020

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“…Heterospecific pollen effects can occur via physical displacement of CP and/or via allelopathic effects (chemical interference), preventing CP germination (Sukada and Jayachandra, ; Wipf et al., ) and limiting reproductive success (e.g., Caruso and Alfaro, ; Arceo‐Gómez and Ashman, , ). However, IS effects on natives via HP transfer can be highly variable (Morales and Traveset, ), and some studies suggest that IS do not always impose negative effects on native species, even under conditions of high pollinator sharing between invasive and native plants (see Bjerknes et al., ; Charlebois and Sargent, ; Stout et al., ).…”

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confidence: 99%

Patterns and effects of heterospecific pollen transfer between an invasive and two native plant species: the importance of pollen arrival time to the stigma

Suárez‐Mariño¹,

Arceo‐Gómez

Sosenski³

et al. 2019

American J of Botany

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Premise Invasive plant species can integrate into native plant–pollinator communities, but the underlying mechanisms are poorly understood. Competitive interactions between invasive and native plants via heterospecific pollen (HP) and differential invasive HP effects depending on HP arrival time to the stigma may mediate invasion success, but these have been little studied. Methods We evaluated patterns and effects of HP receipt on pollen tube growth in two native and one invasive species in the field. We also used hand‐pollination experiments to evaluate the effect of invasive HP pollen and its arrival time on native reproductive success. Results Native species receive smaller and less‐diverse HP loads (5–7 species) compared to invasive species (10 species). The load size of HP had a negative effect on the proportion of pollen tubes in both native species but not in the invasive, suggesting higher HP tolerance in the latter. Invasive HP arrival time differentially affected pollen tube success in native species. Conclusions Our results highlight the need to study reciprocal HP effects between invasive and native species and the factors that determine differential responses to HP receipt to fully understand the mechanisms facilitating invasive species integration into native plant–pollinator communities.

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“…One underappreciated issue that is currently receiving much attention is whether heterospecific pollen can affect conspecific pollen performance on a stigma. Wipf et al (2016 in this issue) formulated and tested a novel hypothesis that metal hyperaccumulators might have elevated heavy metal concentrations in their pollen and therefore be toxic to nonaccumulator pollen when interacting on a stigma. Pollen grains from the nickel hyperaccumulator, Streptanthus polygaloides , were found to have higher levels of nickel than that of a nonaccumulator, Mimulus guttatus .…”

Section: Are Interactions Among Male Gametophytes Important?mentioning

confidence: 99%

Pollen—Tiny and ephemeral but not forgotten: New ideas on their ecology and evolution

Williams

Mazer

2016

American J of Botany

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Ecologists and evolutionary biologists have been interested in the functional biology of pollen since the discovery in the 1800s that pollen grains encompass tiny plants (male gametophytes) that develop and produce sperm cells. After the discovery of double fertilization in flowering plants, botanists in the early 1900s were quick to explore the effects of temperature and maternal nutrients on pollen performance, while evolutionary biologists began studying the nature of haploid selection and pollen competition. A series of technical and theoretic developments have subsequently, but usually separately, expanded our knowledge of the nature of pollen performance and how it evolves. Today, there is a tremendous diversity of interests that touch on pollen performance, ranging from the ecological setting on the stigma, structural and physiological aspects of pollen germination and tube growth, the form of pollen competition and its role in sexual selection in plants, virus transmission, mating system evolution, and inbreeding depression. Given the explosion of technical knowledge of pollen cell biology, computer modeling, and new methods to deal with diversity in a phylogenetic context, we are now more than ever poised for a new era of research that includes complex functional traits that limit or enhance the evolution of these deceptively simple organisms.

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A first test of elemental allelopathy via heterospecific pollen receipt

Cited by 11 publications

References 72 publications

Pollen on stigmas as proxies of pollinator competition and facilitation: complexities, caveats and future directions

Pollen on stigmas as proxies of pollinator competition and facilitation: complexities, caveats and future directions

Patterns and effects of heterospecific pollen transfer between an invasive and two native plant species: the importance of pollen arrival time to the stigma

Pollen—Tiny and ephemeral but not forgotten: New ideas on their ecology and evolution

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