Variation in reward quality and pollinator attraction: the consumer does not always get it right

Carr, David E.; Haber, Ariela I.; LeCroy, Kathryn A.; Lee, De'Ashia E.; Link, Rosabeth I.

doi:10.1093/aobpla/plv034

Cited by 22 publications

(67 citation statements)

References 54 publications

(69 reference statements)

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“…Since pollen is the only reward for pollinators in M. guttatus , pollinators would be expected to preferentially visit outbred plants to optimize nutritional rewards. As expected, pollinators demonstrated preferences for outbred over inbred plants , Carr et al 2015. Furthermore, in pairwise choice tests in which artificial flowers were provisioned with either fertile or sterile anthers from M.…”

Section: Introductionsupporting

confidence: 71%

“…Bombus impatiens also preferred fertile over sterile anthers in an olfactometer test in which visual cues from anthers and pollen were absent (Carr et al 2015). All of these results were obtained using bumblebees that had previous experience foraging on M. guttatus, and provided evidence that experienced bumblebees could make foraging decisions based on reward quality.…”

Section: Introductionmentioning

confidence: 74%

“…impatiens did not discriminate among outbred subpopulations of M. guttatus that differed significantly in reward quality , Carr et al 2015. Moreover, experienced B.…”

Section: Introductionmentioning

confidence: 86%

“…impatiens preferred outbred over inbred plants even when the pollen viability of outbred plants was as low on average as that of inbred plants (Carr et al 2015), indicating that bumblebee preference for outbred plants was not directly driven by reward quality. Preferences for outbred plants were also independent of important visual cues, including corolla width and the number of open flowers , Carr et al 2015.…”

Section: Introductionmentioning

confidence: 95%

“…These studies have demonstrated that inbreeding affects plant defenses as well as host plant quality, thereby influencing susceptibility to herbivore damage. Only a few studies have examined inbreeding effects on plant-pollinator interactions , Carr et al 2015, and the plant traits mediating these effects have been studied less extensively.…”

Section: Introductionmentioning

confidence: 99%

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Variation in Volatile Emission in Mimulus guttatus and Implications for Plant-Insect Interactions

Haber¹

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The volatile compounds emitted from plants function as key host-location cues for their insect visitors. Floral volatiles guide pollinators to nectar and pollen, and in turn, pollinators initiate plant reproduction, potentially promoting a mutualistic interaction. Constitutive and herbivore-induced foliar volatiles function as an important plant defense by deterring herbivores and attracting natural enemies of herbivores. Given the importance of plant volatiles in insect behavior, variation in volatile phenotypes is expected to affect insect visitation patterns, and consequently, plant reproductive success and susceptibility to herbivores. Inbreeding is an important source of genetic variation that it is extremely common in natural populations of flowering plants. Since inbreeding increases homozygosity, inbreeding could increase expression of recessive alleles that disrupt biosynthesis of volatile compounds. In previous work, inbreeding in the mixed-mating herb Mimulus guttatus (yellow monkeyflower) decreased pollinator attraction and resistance to herbivory. However, the plant traits underlying these effects are This dissertation is one of only a few studies to examine effects of inbreeding on plant volatile profiles, and it is the first study to demonstrate that innate olfactory preferences of bumblebees can override learned preferences for floral scents. It is also among the first to differentiate the responses of specialist and generalist herbivores to inbreeding effects in their host. The findings in this dissertation enhance our understanding of the ecology and evolution of plant-insect interactions, which can have important implications for the evolution of plant mating systems and the vulnerability of small populations.

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Section: Introductionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 74%

“…impatiens did not discriminate among outbred subpopulations of M. guttatus that differed significantly in reward quality , Carr et al 2015. Moreover, experienced B.…”

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Variation in Volatile Emission in Mimulus guttatus and Implications for Plant-Insect Interactions

Haber¹

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Inbreeding in Solanum carolinense alters floral attractants and rewards and adversely affects pollinator visitation

Kariyat

Bentley

Nihranz

et al. 2021

American J of Botany

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Inbreeding depression is well documented in flowering plants and adversely affects a wide range of fitness-related traits. Recent work has begun to explore the effects of inbreeding on ecological interactions among plants and other organisms, including insect herbivores and pathogens. However, the effects of inbreeding on floral traits, floral scents, and pollinator visitation are less well studied. METHODS: Using inbred and outbred maternal families of horsenettle (Solanum carolinense, Solanaceae), we examined the effects of inbreeding on traits associated with pollinator attraction and floral rewards. Specifically, we measured corolla size, counted pollen grains per flower, and analyzed floral volatile emissions via gas chromatography and mass spectrometry. We also examined pollinator visitation to experimental arrays of flowering inbred and outbred plants under field conditions. RESULTS: Compared to those of outbred plants, flowers of inbred plants exhibited reduced corolla size and pollen production, as well as significantly reduced emission of the two most abundant volatile compounds in the floral blend. Furthermore, bumblebees-the main pollinators of horsenettle-discriminated against inbred flowers in the field: bees were more likely to make initial visits to flowers on outbred plants, visited outbred flowers more often overall, and spent more time on outbred flowers. CONCLUSIONS: These results show that inbreeding can (1) alter floral traits that are known to mediate pollinator attraction; (2) reduce the production of floral rewards (pollen is the sole reward in horsenettle); and (3) adversely affect pollinator visitation under field conditions.

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The rapid appearance of homostyly in a cultivated distylous population of Primula forbesii

Liu

Jia

et al. 2022

Ecology and Evolution

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Evolutionary breakdown from rigorous outbreeding to self‐fertilization frequently occurs in angiosperms. Since the pollinators are not necessary, self‐compatible populations often reduce investment in floral display characteristics and pollination reward. Primula forbesii is a biennial herb with distribution restricted to southwest China; it was initially a self‐incompatible distylous species, but after 20 years of artificial domestication, homostyly appeared. This change in style provides an ideal material to explore the time required for plant mating systems to adapt to new environmental changes and test whether flower attraction has reduced following transitions to selfing. We did a survey in wild populations of P. forbesii where its seeds were originally collected 20 years ago and recorded the floral morph frequencies and morphologies. The floral morphologies, self‐incompatibility, floral scent, and pollinator visitation between distyly and homostyly were compared in greenhouse. Floral morph frequencies of wild populations did not change, while the cultivated population was inclined to L‐morph and produced homostyly. Evidence from stigma papillae and pollen size supports the hypothesis that the homostyly possibly originated from mutations of large effect genes in distylous linkage region. Transitions to self‐compatible homostyly are accompanied by smaller corolla size, lower amounts of terpenoids, especially linalool and higher amounts of fatty acid derivatives. The main pollinators in the greenhouse were short‐tongued Apis cerana. However, homostyly had reduced visiting frequency. The mating system of P. forbesii changed rapidly in just about 20 years of domestication, and our findings confirm the hypothesis that the transition to selfing is accompanied by decreased flower attraction.

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Variation in reward quality and pollinator attraction: the consumer does not always get it right

Cited by 22 publications

References 54 publications

Variation in Volatile Emission in Mimulus guttatus and Implications for Plant-Insect Interactions

Variation in Volatile Emission in Mimulus guttatus and Implications for Plant-Insect Interactions

Inbreeding in Solanum carolinense alters floral attractants and rewards and adversely affects pollinator visitation

The rapid appearance of homostyly in a cultivated distylous population of Primula forbesii

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