Fitness costs of delayed pollination in a mixed-mating plant

Hildesheim, Laura; Opedal, Øystein H.; Armbruster, W. Scott; Pélabon, Christophe

doi:10.1093/aob/mcz141

Cited by 13 publications

(13 citation statements)

References 74 publications

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“…Female flowers contain three ovules each, and one blossom can bear a maximum of nine seeds. Dalechampia scandens is functionally protogynous, with a female phase that lasts for 2-4 days in our study population (mean = 3.00 days; SD = 0.65 days; Hildesheim, Opedal, Armbruster & Pélabon, 2019). With the opening of the first male flower, the blossom transitions into a bisexual phase lasting 2-4 days (mean = 3.65; SD = 0.67), during which the male flowers open in succession.…”

Section: Study Populationmentioning

confidence: 75%

Quantitative and qualitative consequences of reduced pollen loads in a mixed‐mating plant

Hildesheim

Opedal

Armbruster

et al. 2019

Ecology and Evolution

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Greater pollination intensity can enhance maternal plant fitness by increasing seed set and seed quality as a result of more intense pollen competition or enhanced genetic sampling. We tested experimentally these effects by varying the pollen load from a single pollen donor on stigmas of female flowers of Dalechampia scandens (Euphorbiaceae) and measuring the effects on seed number and seed mass. Seed set increased rapidly with pollen number at low to moderate pollen loads, and a maximum set of three seeds occurred with a mean pollen load of 19 pollen grains. We did not detect a trade‐off between the number of seeds and seed mass within a fruit. Seed mass increased with increasing pollen load, supporting the hypothesis of enhanced seed quality via increased pollen‐competition intensity or genetic sampling. These results suggest that maternal fitness increases with larger pollen loads, even when the fertilization success is already high. Our results further highlight the importance of high rates of pollen arrival onto stigmas, as mediated by reliable pollinators. Comparing the pollen‐to‐seed response curve obtained in this experiment with those observed in natural populations suggests that pollen limitation may be more severe in natural populations than predicted from greenhouse studies. These results also indicate that declines in pollinator abundance may decrease plant fitness through lowered seed quality before an effect on seed set is detected.

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Section: Study Populationmentioning

confidence: 75%

Quantitative and qualitative consequences of reduced pollen loads in a mixed‐mating plant

Hildesheim

Opedal

Armbruster

et al. 2019

Ecology and Evolution

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“…interspecific pollen transfer) affects floral evolution (e.g. Hildesheim et al 2019;Kalisz & Vogler 2003;Moreira-Hernandez & Muchhala;Opedal et al 2016) and studies have examined how reliability of floral rewards affects pollinator behavior (e.g. Austin et al 2019;Dunlap et al 2017); however, how stochasticity in the presence of pollinators affects floral evolution and the delineation of pollination systems remains a largely understudied topic.…”

Section: Discussionmentioning

confidence: 99%

Testing Pollination Syndromes in <i>Oenothera</i> (Onagraceae)

Krakos

Austin

2021

J Poll Ecol

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Pollinators are considered a major selective force in shaping the diversification of angiosperms. It has been hypothesized that convergent evolution of floral form has resulted in “pollination syndromes” - i.e. suites of floral traits that correspond to attraction of particular pollinator functional groups. Across the literature, the pollination syndrome concept has received mixed support. This may be due to studies using different methods to describe floral traits and/or the pollination syndrome concept being supported more often in species highly reliant on pollinators for reproduction. Here, we assess the predictive ability of pollination syndromes in Oenothera, a species rich clade with pollination systems existing on a gradient of specialization, and in which species are either self-compatible or self-incompatible. We ask the following questions: Do Oenothera species follow the pollination syndrome concept using traditional, categorical floral trait descriptions and/or quantitative floral trait measurements? And, are floral traits more predictive of primary pollinators in species with specialized pollination systems and/or species that are self-incompatible? Mapping floral traits of 54 Oenothera species into morphospace, we do not find support for the pollination syndrome concept using either categorical or quantitative floral trait descriptions. We do not find support for specialization or breeding system influencing the prediction of primary pollinators. However, we find pollination syndromes were more predictive in Oenothera species with moth pollination systems. Collectively, these results suggest that the pollination syndrome concept cannot be generally applied across taxa and that evolutionary history is important to consider when evaluating the relationship between floral form and contemporary pollinators.

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“…Monoecious plant species have separate male and female flowers on the same plants and can therefore undergo self-fertilization when the pollen of staminate flowers contacts the stigma of pistillate flowers, barring other defenses against selfing ( Mao et al, 2017 ; Avalos et al, 2019 ; Hildesheim et al, 2019 ). Heterodichogamy, which is dispersed and reported in 20 genera from 13 families of flowering plants, is one of the evolutionary pathways from monoecy to dioecy, heterodichogamous populations usually contain two sexual morphs, protogynous and protandrous, which are reciprocal ( Meng et al, 2009 ; Liu et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Flower Development of Heterodichogamous Juglans mandshurica (Juglandaceae)

Zhang

Guo

et al. 2021

Front. Plant Sci.

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Juglans mandshurica is a monoecious heterodichogamous species with protogynous and protandrous mating strategies that occur at a 1:1 ratio and are randomly distributed in the population. The inconsistent male and female flowering periods of the same mating type result in an imbalance of the ratio of male and female flowers, contributing to the low yield of this species. However, little more is known about its floral development. Following three consecutive years of observations, histological analysis, and scanning electron microscopy, we found that the morphological and anatomical development of the male and female flowers were synchronous. The male floral morphological development of J. mandshurica was divided into seven phases, while that of the female flower was nine. Four stages were shared between the male and female flower’s anatomical development. Our findings indicate that there was minimal overlap between sexual functions within the same mating type, guaranteeing synchronization, mutual non-interference, outcrossing, and avoidance of self-fertilization. These results provide a theoretical basis for the improvement of fruit yield and quality through the reasonable allocation of protogynous and protandrous individuals in a population, and for artificial pollination control. Further, these findings lay a foundation for further research on the genetic mechanisms and environmental effects on flower development of heterodichogamous J. mandshurica.

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Fitness costs of delayed pollination in a mixed-mating plant

Cited by 13 publications

References 74 publications

Quantitative and qualitative consequences of reduced pollen loads in a mixed‐mating plant

Quantitative and qualitative consequences of reduced pollen loads in a mixed‐mating plant

Testing Pollination Syndromes in <i>Oenothera</i> (Onagraceae)

Flower Development of Heterodichogamous Juglans mandshurica (Juglandaceae)

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