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Magner ET, Freund Saxhaug K, Zambre A, Bruns K, Carroll P, Snell-Rood EC, Hegeman AD, Carter CJ. A multifunctional role for riboflavin in the yellow nectar of Capsicum baccatum and Capsicum pubescens. THE NEW PHYTOLOGIST 2024; 243:1991-2007. [PMID: 38874372 DOI: 10.1111/nph.19886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 05/14/2024] [Indexed: 06/15/2024]
Abstract
A few Capsicum (pepper) species produce yellow-colored floral nectar, but the chemical identity and biological function of the yellow pigment are unknown. A combination of analytical biochemistry techniques was used to identify the pigment that gives Capsicum baccatum and Capsicum pubescens nectars their yellow color. Microbial growth assays, visual modeling, and honey bee preference tests for artificial nectars containing riboflavin were used to assess potential biological roles for the nectar pigment. High concentrations of riboflavin (vitamin B2) give the nectars their intense yellow color. Nectars containing riboflavin generate reactive oxygen species when exposed to light and reduce microbial growth. Visual modeling also indicates that the yellow color is highly conspicuous to bees within the context of the flower. Lastly, field experiments demonstrate that honey bees prefer artificial nectars containing riboflavin. Some Capsicum nectars contain a yellow-colored vitamin that appears to play roles in (1) limiting microbial growth, (2) the visual attraction of bees, and (3) as a reward to nectar-feeding flower visitors (potential pollinators), which is especially interesting since riboflavin is an essential nutrient for brood rearing in insects. These results cumulatively suggest that the riboflavin found in some Capsicum nectars has several functions.
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Affiliation(s)
- Evin T Magner
- Department of Plant & Microbial Biology, University of Minnesota, 1479 Gortner Avenue, St. Paul, MN, 55108, USA
| | | | - Amod Zambre
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, 55108, USA
| | - Kaitlyn Bruns
- Department of Plant & Microbial Biology, University of Minnesota, 1479 Gortner Avenue, St. Paul, MN, 55108, USA
| | - Patrick Carroll
- Department of Plant & Microbial Biology, University of Minnesota, 1479 Gortner Avenue, St. Paul, MN, 55108, USA
| | - Emilie C Snell-Rood
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, 55108, USA
| | - Adrian D Hegeman
- Department of Plant & Microbial Biology, University of Minnesota, 1479 Gortner Avenue, St. Paul, MN, 55108, USA
- Department of Horticultural Science, University of Minnesota, St. Paul, MN, 55108, USA
| | - Clay J Carter
- Department of Plant & Microbial Biology, University of Minnesota, 1479 Gortner Avenue, St. Paul, MN, 55108, USA
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Francis JS, Mueller TG, Vannette RL. Intraspecific variation in realized dispersal probability and host quality shape nectar microbiomes. THE NEW PHYTOLOGIST 2023; 240:1233-1245. [PMID: 37614102 DOI: 10.1111/nph.19195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 07/16/2023] [Indexed: 08/25/2023]
Abstract
Epiphytic microbes frequently affect plant phenotype and fitness, but their effects depend on microbe abundance and community composition. Filtering by plant traits and deterministic dispersal-mediated processes can affect microbiome assembly, yet their relative contribution to predictable variation in microbiome is poorly understood. We compared the effects of host-plant filtering and dispersal on nectar microbiome presence, abundance, and composition. We inoculated representative bacteria and yeast into 30 plants across four phenotypically distinct cultivars of Epilobium canum. We compared the growth of inoculated communities to openly visited flowers from a subset of the same plants. There was clear evidence of host selection when we inoculated flowers with synthetic communities. However, plants with the highest microbial densities when inoculated did not have the highest microbial densities when openly visited. Instead, plants predictably varied in the presence of bacteria, which was correlated with pollen receipt and floral traits, suggesting a role for deterministic dispersal. These findings suggest that host filtering could drive plant microbiome assembly in tissues where species pools are large and dispersal is high. However, deterministic differences in microbial dispersal to hosts may be equally or more important when microbes rely on an animal vector, dispersal is low, or arrival order is important.
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Affiliation(s)
- Jacob S Francis
- Department of Entomology and Nematology, University of California Davis, Davis, CA, 95616, USA
| | - Tobias G Mueller
- Department of Entomology, Cornell University, Ithaca, NY, 14853, USA
| | - Rachel L Vannette
- Department of Entomology and Nematology, University of California Davis, Davis, CA, 95616, USA
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Kakkar RA, Haneen MA, Parida AC, Sharma G. The known, unknown, and the intriguing about members of a critically endangered traditional medicinal plant genus Aconitum. FRONTIERS IN PLANT SCIENCE 2023; 14:1139215. [PMID: 37575934 PMCID: PMC10421671 DOI: 10.3389/fpls.2023.1139215] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 04/03/2023] [Indexed: 08/15/2023]
Abstract
Humanity will always be indebted to plants. In the ongoing scientific era, the 'Herbal Revolution' has helped discover several valuable medicinal plants and associated novel secondary metabolites from the diverse unexplored ecosystems, treating several diseases via phytotherapy. The Aconitum genus comprises several economically-important poisonous mountainous medicinal plant species whose unique biodiversity is on the verge of extinction due to illegal human intervention triggered habitat loss, over-harvesting, and unrestricted trading. Owing to its vast diversity of diterpene alkaloids, most species are extensively used to treat several ailments in rural parts of the world. Irrespective of this, many unexplored and intriguing prospects exist to understand and utilize this critical plant for human benefit. This systematic review tries to fill this gap by compiling information from the sporadically available literature known for ~300 Aconitum spp. regarding its nomenclature and classification, endangerment, plant morphology, ploidy, secondary metabolites, drug pharmacokinetics, conservation, and omics-based computational studies. We also depicted the disparity in the studied model organisms for this diverse genus. The absence of genomic/metagenomic data is becoming a limiting factor in understanding its plant physiology, metabolic pathways, and plant-microbes interactions, and therefore must be promoted. Additionally, government support and public participation are crucial in establishing conservation protocols to save this plant from endangerment.
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Affiliation(s)
- Richa Ashok Kakkar
- Department of Biotechnology, Indian Institute of Technology Hyderabad, Sangareddy, Telangana, India
- Institute of Bioinformatics and Applied Biotechnology, Bengaluru, India
| | - Mariam Azeezuddin Haneen
- Department of Biotechnology, Indian Institute of Technology Hyderabad, Sangareddy, Telangana, India
- Institute of Bioinformatics and Applied Biotechnology, Bengaluru, India
| | | | - Gaurav Sharma
- Department of Biotechnology, Indian Institute of Technology Hyderabad, Sangareddy, Telangana, India
- Institute of Bioinformatics and Applied Biotechnology, Bengaluru, India
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Mueller TG, Francis JS, Vannette RL. Nectar compounds impact bacterial and fungal growth and shift community dynamics in a nectar analog. ENVIRONMENTAL MICROBIOLOGY REPORTS 2023; 15:170-180. [PMID: 36779256 PMCID: PMC10464699 DOI: 10.1111/1758-2229.13139] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 12/04/2022] [Indexed: 05/06/2023]
Abstract
Floral nectar is frequently colonised by microbes. However, nectar microbial communities are typically species-poor and dominated by few cosmopolitan genera. One hypothesis is that nectar constituents may act as environmental filters. We tested how five non-sugar nectar compounds as well as elevated sugar impacted the growth of 12 fungal and bacterial species isolated from nectar, pollinators, and the environment. We hypothesised that nectar isolated microbes would have the least growth suppression. Additionally, to test if nectar compounds could affect the outcome of competition between microbes, we grew a subset of microbes in co-culture across a subset of treatments. We found that some compounds such as H2 O2 suppressed microbial growth across many but not all microbes tested. Other compounds were more specialised in the microbes they impacted. As hypothesised, the nectar specialist yeast Metschnikowia reukaufii was unaffected by most nectar compounds assayed. However, many non-nectar specialist microbes remained unaffected by nectar compounds thought to reduce microbial growth. Our results show that nectar chemistry can influence microbial communities but that microbe-specific responses to nectar compounds are common. Nectar chemistry also affected the outcome of species interactions among microbial taxa, suggesting that non-sugar compounds can affect microbial community assembly in flowers.
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Affiliation(s)
- Tobias G. Mueller
- Department of Entomology and NematologyUniversity of California, DavisDavisCaliforniaUSA
- Department of EntomologyCornell UniversityIthacaNew YorkUSA
| | - Jacob S. Francis
- Department of Entomology and NematologyUniversity of California, DavisDavisCaliforniaUSA
| | - Rachel L. Vannette
- Department of Entomology and NematologyUniversity of California, DavisDavisCaliforniaUSA
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Değirmenci L, Rogé Ferreira FL, Vukosavljevic A, Heindl C, Keller A, Geiger D, Scheiner R. Sugar perception in honeybees. Front Physiol 2023; 13:1089669. [PMID: 36714315 PMCID: PMC9880324 DOI: 10.3389/fphys.2022.1089669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 12/28/2022] [Indexed: 01/14/2023] Open
Abstract
Honeybees (Apis mellifera) need their fine sense of taste to evaluate nectar and pollen sources. Gustatory receptors (Grs) translate taste signals into electrical responses. In vivo experiments have demonstrated collective responses of the whole Gr-set. We here disentangle the contributions of all three honeybee sugar receptors (AmGr1-3), combining CRISPR/Cas9 mediated genetic knock-out, electrophysiology and behaviour. We show an expanded sugar spectrum of the AmGr1 receptor. Mutants lacking AmGr1 have a reduced response to sucrose and glucose but not to fructose. AmGr2 solely acts as co-receptor of AmGr1 but not of AmGr3, as we show by electrophysiology and using bimolecular fluorescence complementation. Our results show for the first time that AmGr2 is indeed a functional receptor on its own. Intriguingly, AmGr2 mutants still display a wildtype-like sugar taste. AmGr3 is a specific fructose receptor and is not modulated by a co-receptor. Eliminating AmGr3 while preserving AmGr1 and AmGr2 abolishes the perception of fructose but not of sucrose. Our comprehensive study on the functions of AmGr1, AmGr2 and AmGr3 in honeybees is the first to combine investigations on sugar perception at the receptor level and simultaneously in vivo. We show that honeybees rely on two gustatory receptors to sense all relevant sugars.
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Affiliation(s)
- Laura Değirmenci
- Behavioral Physiology and Sociobiology, Biocenter, Julius-Maximilians-Universität Würzburg, Wuerzburg, Germany,*Correspondence: Laura Değirmenci, ; Fabio Luiz Rogé Ferreira,
| | - Fabio Luiz Rogé Ferreira
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, Julius-Maximilians-Universität Würzburg, Wuerzburg, Germany,*Correspondence: Laura Değirmenci, ; Fabio Luiz Rogé Ferreira,
| | - Adrian Vukosavljevic
- Behavioral Physiology and Sociobiology, Biocenter, Julius-Maximilians-Universität Würzburg, Wuerzburg, Germany
| | - Cornelia Heindl
- Behavioral Physiology and Sociobiology, Biocenter, Julius-Maximilians-Universität Würzburg, Wuerzburg, Germany
| | - Alexander Keller
- Organismic and Cellular Interactions, Faculty of Biology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Dietmar Geiger
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, Julius-Maximilians-Universität Würzburg, Wuerzburg, Germany
| | - Ricarda Scheiner
- Behavioral Physiology and Sociobiology, Biocenter, Julius-Maximilians-Universität Würzburg, Wuerzburg, Germany
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Fenner ED, Scapini T, da Costa Diniz M, Giehl A, Treichel H, Álvarez-Pérez S, Alves SL. Nature's Most Fruitful Threesome: The Relationship between Yeasts, Insects, and Angiosperms. J Fungi (Basel) 2022; 8:984. [PMID: 36294549 PMCID: PMC9605484 DOI: 10.3390/jof8100984] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 09/13/2022] [Accepted: 09/18/2022] [Indexed: 07/30/2023] Open
Abstract
The importance of insects for angiosperm pollination is widely recognized. In fact, approximately 90% of all plant species benefit from animal-mediated pollination. However, only recently, a third part player in this story has been properly acknowledged. Microorganisms inhabiting floral nectar, among which yeasts have a prominent role, can ferment glucose, fructose, sucrose, and/or other carbon sources in this habitat. As a result of their metabolism, nectar yeasts produce diverse volatile organic compounds (VOCs) and other valuable metabolites. Notably, some VOCs of yeast origin can influence insects' foraging behavior, e.g., by attracting them to flowers (although repelling effects have also been reported). Moreover, when insects feed on nectar, they also ingest yeast cells, which provide them with nutrients and protect them from pathogenic microorganisms. In return, insects serve yeasts as transportation and a safer habitat during winter when floral nectar is absent. From the plant's point of view, the result is flowers being pollinated. From humanity's perspective, this ecological relationship may also be highly profitable. Therefore, prospecting nectar-inhabiting yeasts for VOC production is of major biotechnological interest. Substances such as acetaldehyde, ethyl acetate, ethyl butyrate, and isobutanol have been reported in yeast volatomes, and they account for a global market of approximately USD 15 billion. In this scenario, the present review addresses the ecological, environmental, and biotechnological outlooks of this three-party mutualism, aiming to encourage researchers worldwide to dig into this field.
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Affiliation(s)
- Eduardo D. Fenner
- Graduate Program in Environment and Sustainable Technologies, Federal University of Fronteira Sul, Campus Cerro Largo, Cerro Largo 97900-000, RS, Brazil
- Laboratory of Yeast Biochemistry, Federal University of Fronteira Sul, Campus Chapecó, Chapecó 89815-899, SC, Brazil
| | - Thamarys Scapini
- Laboratory of Microbiology and Bioprocesses, Federal University of Fronteira Sul, Campus Erechim, Erechim 99700-970, RS, Brazil
| | - Mariana da Costa Diniz
- Laboratory of Yeast Biochemistry, Federal University of Fronteira Sul, Campus Chapecó, Chapecó 89815-899, SC, Brazil
| | - Anderson Giehl
- Laboratory of Yeast Biochemistry, Federal University of Fronteira Sul, Campus Chapecó, Chapecó 89815-899, SC, Brazil
| | - Helen Treichel
- Laboratory of Microbiology and Bioprocesses, Federal University of Fronteira Sul, Campus Erechim, Erechim 99700-970, RS, Brazil
| | - Sergio Álvarez-Pérez
- Department of Animal Health, Faculty of Veterinary Medicine, Complutense University of Madrid, 28040 Madrid, Spain
| | - Sérgio L. Alves
- Graduate Program in Environment and Sustainable Technologies, Federal University of Fronteira Sul, Campus Cerro Largo, Cerro Largo 97900-000, RS, Brazil
- Laboratory of Yeast Biochemistry, Federal University of Fronteira Sul, Campus Chapecó, Chapecó 89815-899, SC, Brazil
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7
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Nicolson SW. Sweet solutions: nectar chemistry and quality. Philos Trans R Soc Lond B Biol Sci 2022; 377:20210163. [PMID: 35491604 PMCID: PMC9058545 DOI: 10.1098/rstb.2021.0163] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 11/07/2021] [Indexed: 12/22/2022] Open
Abstract
Nectar, the main floral reward for pollinators, varies greatly in composition and concentration. The assumption that nectar quality is equivalent to its sugar (energy) concentration is too simple. Diverse non-sugar components, especially amino acids and secondary metabolites, play various roles in nutrition and health of pollinators. Many nectar compounds have indirect effects by altering the foraging behaviour of pollinators or protecting them from disease. This review also emphasizes the water component of nectar, often ignored because of evaporative losses and difficulties in sampling small nectar volumes. Nectar properties vary with environmental factors, pollinator visits and microbial contamination. Pollination mutualisms depend on the ability of insect and vertebrate pollinators to cope with and benefit from the variation and diversity in nectar chemistry. This article is part of the theme issue 'Natural processes influencing pollinator health: from chemistry to landscapes'.
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Affiliation(s)
- Susan W. Nicolson
- Department of Zoology and Entomology, University of Pretoria, Pretoria 0002, South Africa
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8
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Ryniewicz J, Roguz K, Mirski P, Brzosko E, Skłodowski M, Wróblewska A, Ostrowiecka B, Tałałaj I, Jermakowicz E, Zych M. Spatiotemporal Variations in Seed Set and Pollen Limitation in Populations of the Rare Generalist Species Polemonium caeruleum in Poland. FRONTIERS IN PLANT SCIENCE 2022; 12:755830. [PMID: 35046972 PMCID: PMC8761629 DOI: 10.3389/fpls.2021.755830] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 11/22/2021] [Indexed: 06/01/2023]
Abstract
A vast majority of angiosperms are pollinated by animals, and a decline in the number and diversity of insects often affects plant reproduction through pollen limitation. This phenomenon may be particularly severe in rare plant species, whose populations are shrinking. Here, we examined the variability in factors shaping reproductive success and pollen limitation in red-listed Polemonium caeruleum L. During a 5-year study in several populations of P. caeruleum (7-15, depending on year), we assessed the degree of pollen limitation based on differences in seed set between open-pollinated (control) and hand-pollinated flowers. We analysed the effects of flower visitors, population size, and meteorological data on plant reproductive success and pollen limitation. Our study showed that pollen limitation rarely affected P. caeruleum populations, and was present mainly in small populations. Pollen limitation index was negatively affected by the size of population, visitation frequency of all insects, and when considering the visitation frequency of individual groups, also by honeybee visits. Seed production in control treatment was positively influenced by the population size, average monthly precipitation in June and visits of hoverflies, while visits of honeybees, average monthly temperature in September, and average monthly precipitation in August influenced seed production negatively. As generalist plant P. caeruleum can be pollinated by diverse insect groups, however, in small populations their main visitors, the honeybees and bumblebees, may be less attracted, eventually leading to the disappearance of these populations. In pollination of P. caeruleum managed honeybees may play a dual role: while they are the most frequent and efficient flower visitors, their presence decreases seed set in open-pollinated flowers, which is most probably related to efficient pollen collection by these insects.
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Affiliation(s)
- Justyna Ryniewicz
- Botanic Garden, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Katarzyna Roguz
- Botanic Garden, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Paweł Mirski
- Faculty of Biology, University of Białystok, Białystok, Poland
| | - Emilia Brzosko
- Faculty of Biology, University of Białystok, Białystok, Poland
| | - Mateusz Skłodowski
- Botanic Garden, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Ada Wróblewska
- Faculty of Biology, University of Białystok, Białystok, Poland
| | | | - Izabela Tałałaj
- Faculty of Biology, University of Białystok, Białystok, Poland
| | | | - Marcin Zych
- Botanic Garden, Faculty of Biology, University of Warsaw, Warsaw, Poland
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Colda A, Bossaert S, Verreth C, Vanhoutte B, Honnay O, Keulemans W, Lievens B. Inoculation of pear flowers with Metschnikowia reukaufii and Acinetobacter nectaris enhances attraction of honeybees and hoverflies, but does not increase fruit and seed set. PLoS One 2021; 16:e0250203. [PMID: 33886638 PMCID: PMC8061982 DOI: 10.1371/journal.pone.0250203] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/02/2021] [Indexed: 11/28/2022] Open
Abstract
Currently, one of the most important challenges is to provide sufficient and affordable food and energy for a fast-growing world population, alongside preserving natural habitats and maintaining biodiversity. About 35% of the global food production depends on animals for pollination. In recent years, an alarming worldwide decline in pollinators has been reported, putting our food production under additional pressure. Therefore, there is an urgent need to find sustainable ways to ensure this crucial ecosystem service. Recent studies have shown that floral nectar is generally colonized by microorganisms, specifically yeasts and bacteria, which may alter nectar chemistry and enhance attraction of pollinators. In this study, we investigated changes in pollinator foraging behavior and pollination success in European pear (Pyrus communis L.) cultivars 'Regal Red' and 'Sweet Sensation' (red sports of 'Doyenné de Comice') after flower inoculation with the typical nectar-inhabiting microorganisms Metschnikowia reukaufii and Acinetobacter nectaris, and a combination of both. Pollination success was monitored by measuring the number of flower visits, fruit set and seed set in two consecutive years, 2019 and 2020. Results revealed that application of a mixture of M. reukaufii and A. nectaris resulted in significantly higher visitation rates of honeybees and hoverflies. By contrast, no effects on flower visits were found when yeasts and bacteria were applied separately. Fruit set and seed set were not significantly affected by any of the inoculation treatments. The only factors affecting fruit set were initial number of flower clusters on the trees and the year. The absence of treatment effects can most likely be attributed to the fact that pollination was not a limiting factor for fruit set in our experiments. Altogether, our results show that inoculation of flowers with nectar microbes can modify pollinator foraging patterns, but did not lead to increased pollination success under the conditions tested.
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Affiliation(s)
- Agneta Colda
- Division of Crop Biotechnics, Laboratory for Fruit Breeding and Biotechnology, Department of Biosystems, KU Leuven, Leuven, Belgium
| | - Sofie Bossaert
- Laboratory for Process Microbial Ecology and Bioinspirational Management, Department of Microbial and Molecular Systems, Center of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Christel Verreth
- Laboratory for Process Microbial Ecology and Bioinspirational Management, Department of Microbial and Molecular Systems, Center of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Bart Vanhoutte
- Research Center for Fruit Growing, Sint-Truiden, Belgium
| | - Olivier Honnay
- Division of Ecology, Evolution and Biodiversity Conservation, Department of Biology, Plant Conservation and Population Biology, KU Leuven, Leuven, Belgium
| | - Wannes Keulemans
- Division of Crop Biotechnics, Laboratory for Fruit Breeding and Biotechnology, Department of Biosystems, KU Leuven, Leuven, Belgium
| | - Bart Lievens
- Laboratory for Process Microbial Ecology and Bioinspirational Management, Department of Microbial and Molecular Systems, Center of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
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