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Hoepflinger MC, Barman M, Dötterl S, Tenhaken R. A novel O-methyltransferase Cp4MP-OMT catalyses the final step in the biosynthesis of the volatile 1,4-dimethoxybenzene in pumpkin (Cucurbita pepo) flowers. BMC PLANT BIOLOGY 2024; 24:294. [PMID: 38632532 PMCID: PMC11022444 DOI: 10.1186/s12870-024-04955-3] [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: 02/06/2024] [Accepted: 03/27/2024] [Indexed: 04/19/2024]
Abstract
BACKGROUND Floral scents play a crucial role in attracting insect pollinators. Among the compounds attractive to pollinators is 1,4-dimethoxybenzene (1,4-DMB). It is a significant contributor to the scent profile of plants from various genera, including economically important Cucurbita species. Despite its importance, the biosynthetic pathway for the formation of 1,4-DMB was not elucidated so far. RESULTS In this study we showed the catalysis of 1,4-DMB in the presence of 4-methoxyphenol (4-MP) by protein extract from Styrian oil pumpkin (Cucurbita pepo) flowers. Based on this finding, we identified a novel O-methyltransferase gene, Cp4MP-OMT, whose expression is highly upregulated in the volatile-producing tissue of pumpkin flowers when compared to vegetative tissues. OMT activity was verified by purified recombinant Cp4MP-OMT, illustrating its ability to catalyse the methylation of 4-MP to 1,4-DMB in the presence of cofactor SAM (S-(5'-adenosyl)-L-methionine). CONCLUSIONS Cp4MP-OMT is a novel O-methyltransferase from C. pepo, responsible for the final step in the biosynthesis of the floral scent compound 1,4-DMB. Considering the significance of 1,4-DMB in attracting insects for pollination and in the further course fruit formation, enhanced understanding of its biosynthetic pathways holds great promise for both ecological insights and advancements in plant breeding initiatives.
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Affiliation(s)
- Marion Christine Hoepflinger
- Department of Environment & Biodiversity, Paris Lodron University Salzburg, Hellbrunnerstraße 34, Salzburg, 5020, Austria
| | - Monica Barman
- Department of Environment & Biodiversity, Paris Lodron University Salzburg, Hellbrunnerstraße 34, Salzburg, 5020, Austria
- Leibniz Institute of Vegetable and Ornamental Crops (IGZ), Theodor-Echtermeyer-Weg 1, 14979, Großbeeren, Germany
| | - Stefan Dötterl
- Department of Environment & Biodiversity, Paris Lodron University Salzburg, Hellbrunnerstraße 34, Salzburg, 5020, Austria
| | - Raimund Tenhaken
- Department of Environment & Biodiversity, Paris Lodron University Salzburg, Hellbrunnerstraße 34, Salzburg, 5020, Austria.
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2
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Noh YM, Ait Hida A, Raymond O, Comte G, Bendahmane M. The scent of roses, a bouquet of fragrance diversity. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:1252-1264. [PMID: 38015983 DOI: 10.1093/jxb/erad470] [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: 09/05/2023] [Accepted: 11/27/2023] [Indexed: 11/30/2023]
Abstract
Roses have been domesticated since antiquity for their therapeutic, cosmetic, and ornamental properties. Their floral fragrance has great economic value, which has influenced the production of rose varieties. The production of rose water and essential oil is one of the most lucrative activities, supplying bioactive molecules to the cosmetic, pharmaceutical, and therapeutic industries. In recent years, major advances in molecular genetics, genomic, and biochemical tools have paved the way for the identification of molecules that make up the specific fragrance of various rose cultivars. The aim of this review is to highlight current knowledge on metabolite profiles, and more specifically on fragrance compounds, as well as the specificities and differences between rose species and cultivars belonging to different rose sections and how they contribute to modern roses fragrance.
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Affiliation(s)
- Yuo-Myoung Noh
- Laboratoire Reproduction et Développement des Plantes, INRA-CNRS-Lyon1-ENS, Ecole Normale Supérieure de Lyon, Lyon, France
- UMR Ecologie Microbienne, CNRS, INRA, VetAgro Sup, UCBL, Université de Lyon, Lyon, France
| | - Amal Ait Hida
- Institut Agronomique et Vétérinaire, Complexe Horticole, Agadir, Morocco
| | - Olivier Raymond
- Laboratoire Reproduction et Développement des Plantes, INRA-CNRS-Lyon1-ENS, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Gilles Comte
- UMR Ecologie Microbienne, CNRS, INRA, VetAgro Sup, UCBL, Université de Lyon, Lyon, France
| | - Mohammed Bendahmane
- Laboratoire Reproduction et Développement des Plantes, INRA-CNRS-Lyon1-ENS, Ecole Normale Supérieure de Lyon, Lyon, France
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Dos Santos AT, Souza JPA, Jorge IR, Andrade SMM, Rosa BB, Moura MO, Zarbin PHG. Can Pheromones Contribute to Phylogenetic Hypotheses? A Case Study of Chrysomelidae. J Chem Ecol 2023; 49:611-641. [PMID: 37856061 DOI: 10.1007/s10886-023-01450-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 08/15/2023] [Accepted: 08/21/2023] [Indexed: 10/20/2023]
Abstract
Pheromones mediate species-level communication in the search for mates, nesting, and feeding sites. Although the role of pheromones has long been discussed by various authors, their existence was not proven until the mid-twentieth century when the first sex pheromone was identified. From this finding, much has been speculated about whether this communication mechanism has acted as a regulatory agent in the process of speciation, competition, and sexual selection since it acts as an intraspecific barrier. Chrysomelidae is one of the major Phytophaga lineages, with approximately 40,000 species. Due to this immense diversity the internal relationships remain unstable when analyzed only with morphological data, consequently recent efforts have been directed to molecular analyses to establish clarity for the relationships and found their respective monophyly. Therefore, our goals are twofold 1) to synthesize the current literature on Chrysomelidae sex pheromones and 2) to test whether Chrysomelidae sex pheromones and their chemical structures could be used in phylogenetic analysis for the group. The results show that, although this is the first analysis in Chrysomelidae to use pheromones as a phylogenetic character, much can be observed in agreement with previous analyses, thus confirming that pheromones, when known in their entirety within lineages, can be used as characters in phylogenetic analyses, bringing elucidation to the relationships and evolution of organisms.
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Affiliation(s)
- Aluska T Dos Santos
- Setor de Ciências Exatas, Departamento de Química, Universidade Federal do Paraná, Curitiba, Paraná, CEP 81531-980, Brazil
- Setor de Ciências Biológicas, Departamento de Zoologia, Universidade Federal do Paraná, Curitiba, Paraná, CEP 81531-980, Brazil
| | - João P A Souza
- Setor de Ciências Exatas, Departamento de Química, Universidade Federal do Paraná, Curitiba, Paraná, CEP 81531-980, Brazil
| | - Isaac R Jorge
- Setor de Ciências Biológicas, Departamento de Zoologia, Universidade Federal do Paraná, Curitiba, Paraná, CEP 81531-980, Brazil
| | - Samara M M Andrade
- Natural Resources Canada - Great Lakes Forestry Centre, Sault Ste Marie, Ontario, P6A 2E5, Canada
- Graduate Department of Forestry, John H. Daniels Faculty of Architecture, Landscape and Design, University of Toronto, Toronto, Ontario, M5S 3B3, Canada
| | - Brunno B Rosa
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, 14040-901, Brazil
- Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Center for Integrative Biodiversity Discovery, Invalidenstraße 43, 10115, Berlin, Germany
| | - Maurício O Moura
- Setor de Ciências Biológicas, Departamento de Zoologia, Universidade Federal do Paraná, Curitiba, Paraná, CEP 81531-980, Brazil
| | - Paulo H G Zarbin
- Setor de Ciências Exatas, Departamento de Química, Universidade Federal do Paraná, Curitiba, Paraná, CEP 81531-980, Brazil.
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Jenny LA, Shapiro LR, Davis CC, Jonathan Davies T, Pierce NE, Meineke E. Herbarium specimens reveal herbivory patterns across the genus Cucurbita. AMERICAN JOURNAL OF BOTANY 2023; 110:e16126. [PMID: 36633920 DOI: 10.1002/ajb2.16126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 12/12/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
PREMISE Quantifying how closely related plant species differ in susceptibility to insect herbivory is important for understanding the variation in evolutionary pressures on plant functional traits. However, empirically measuring in situ variation in herbivory spanning the geographic range of a plant-insect complex is logistically difficult. Recently, new methods have been developed using herbarium specimens to investigate patterns in plant-insect symbioses across large geographic scales. Such investigations provide insights into how accelerated anthropogenic changes may impact plant-insect interactions that are of ecological or agricultural importance. METHODS Here, we analyze 274 pressed herbarium samples to investigate variation in herbivory damage in 13 different species of the economically important plant genus Cucurbita (Cucurbitaceae). This collection is composed of specimens of wild, undomesticated Cucurbita that were collected from across their native range, and Cucurbita cultivars collected from both within their native range and from locations where they have been introduced for agriculture in temperate North America. RESULTS Herbivory is common on individuals of all Cucurbita species collected throughout their geographic ranges. However, estimates of herbivory varied considerably among individuals, with mesophytic species accruing more insect damage than xerophytic species, and wild specimens having more herbivory than specimens collected from human-managed habitats. CONCLUSIONS Our study suggests that long-term evolutionary changes in habitat from xeric to mesic climates and wild to human-managed habitats may mediate the levels of herbivory pressure from coevolved herbivores. Future investigations into the potential factors that contribute to herbivory may inform the management of domesticated crop plants and their insect herbivores.
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Affiliation(s)
- Laura A Jenny
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, 02138, United States
| | - Lori R Shapiro
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, 02138, United States
- Department of Applied Ecology, North Carolina State University, Raleigh, North Carolina, 27695, United States
| | - Charles C Davis
- Harvard University Herbaria, Department of Organismal and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, 02138, United States
| | - T Jonathan Davies
- Departments of Botany, and Forest & Conservation Sciences, University of British Columbia, Vancouver, British Columbia, BC V6T 1Z4, Canada
- African Centre for DNA Barcoding, University of Johannesburg, Johannesburg, Gauteng, 2028, South Africa
| | - Naomi E Pierce
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, 02138, United States
| | - Emily Meineke
- Department of Entomology and Nematology, University of California, Davis, Davis, California, 95616, United States
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Optimization of a Mass Trapping Method against the Striped Cucumber Beetle Acalymma vittatum in Organic Cucurbit Fields. INSECTS 2022; 13:insects13050465. [PMID: 35621800 PMCID: PMC9147337 DOI: 10.3390/insects13050465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/12/2022] [Accepted: 05/13/2022] [Indexed: 11/17/2022]
Abstract
Simple Summary Striped cucumber beetles are the main pest of cucurbits in North America. Organic cucurbit producers face a great challenge since few effective organic-approved striped cucumber beetle control methods exist. In this study, we evaluated and improved a mass trapping method using perforated yellow jugs with commercially available odorant baits to attract striped cucumber beetles. Our goal was to maximize striped cucumber beetle captures while minimizing unwanted captures of beneficial insects. We found that baited traps attracted more striped cucumber beetles than unbaited traps, and that traps with smaller holes effectively captured striped cucumber beetles while limiting unwanted captures. Finally, we also determined an optimal bait type that should preferentially be used to capture striped cucumber beetles. Abstract The striped cucumber beetle (SCB) Acalymma vittatum (F.) (Coleptera: Chrysomelidae) is a prime problem in North American cucurbit crops. While certain chemical pesticides efficiently control SCB in conventional cucurbit fields, alternative solutions are required due to the ever-evolving regulations on pesticides. For organic producers, very few control methods exist. A novel mass trapping method demonstrates the potential of controlling SCBs using floral-based semiochemical baited traps in cucurbit crops. The goals of this study were to (1) determine whether baited traps capture more SCBs than unbaited ones, and (2) optimize the trapping method by comparing different trap types and different commercially available attractants to maximize SCB captures while minimizing non-target species captures. The results of a first experiment showed that baited traps captured significantly more SCBs than unbaited ones. Baited traps also captured significantly more bees and hoverflies than unbaited ones. In a second experiment these unwanted captures were drastically reduced by using traps with ten 4 mm in diameter holes per side. Finally, a third experiment demonstrated that the attractant 40CT313 was the most efficient at capturing SCB compared to other tested lures. Overall, the optimized mass trapping technique demonstrated a potential to effectively control SCB populations in organic cucurbit crops.
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Yacine Y, Loeuille N. Stable coexistence in plant-pollinator-herbivore communities requires balanced mutualistic vs antagonistic interactions. Ecol Modell 2022. [DOI: 10.1016/j.ecolmodel.2021.109857] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Zhu L, Liao J, Liu Y, Zhou C, Wang X, Hu Z, Huang B, Zhang J. Integrative metabolome and transcriptome analyses reveal the molecular mechanism underlying variation in floral scent during flower development of Chrysanthemum indicum var. aromaticum. FRONTIERS IN PLANT SCIENCE 2022; 13:919151. [PMID: 36733600 PMCID: PMC9889088 DOI: 10.3389/fpls.2022.919151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 08/11/2022] [Indexed: 05/19/2023]
Abstract
Chrysanthemum indicum var. aromaticum (CIA) is an endemic plant that occurs only in the high mountain areas of the Shennongjia Forest District in China. The whole plant, in particular the flowers of CIA, have intense fragrance, making it a novel resource plant for agricultural, medicinal, and industrial applications. However, the volatile metabolite emissions in relation to CIA flower development and the molecular mechanisms underlying the generation of floral scent remain poorly understood. Here, integrative metabolome and transcriptome analyses were performed to investigate floral scent-related volatile compounds and genes in CIA flowers at three different developmental stages. A total of 370 volatile metabolites, mainly terpenoids and esters, were identified, of which 89 key differential metabolites exhibited variable emitting profiles during flower development. Transcriptome analysis further identified 8,945 differentially expressed genes (DEGs) between these samples derived from different flower developmental stages and KEGG enrichment analyses showed that 45, 93, and 101 candidate DEGs associated with the biosynthesis of phenylpropanoids, esters, and terpenes, respectively. Interestingly, significant DEGs involved into the volatile terpenes are only present in the MEP and its downstream pathways, including those genes encoding ISPE, ISPG, FPPS, GPPS, GERD, ND and TPS14 enzymes. Further analysis showed that 20 transcription factors from MYB, bHLH, AP2/EFR, and WRKY families were potentially key regulators affecting the expressions of floral scent-related genes during the CIA flower development. These findings provide insights into the molecular basis of plant floral scent metabolite biosynthesis and serve as an important data resources for molecular breeding and utilization of CIA plants in the future.
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Affiliation(s)
- Lu Zhu
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, Hubei, China
| | - Jiahao Liao
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, Hubei, China
| | - Yifei Liu
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, Hubei, China
| | - Chunmiao Zhou
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, Hubei, China
| | - Xu Wang
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, Hubei, China
| | - Zhigang Hu
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, Hubei, China
| | - Bisheng Huang
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, Hubei, China
- *Correspondence: Bisheng Huang,
| | - Jingjing Zhang
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, Hubei, China
- South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Jingjing Zhang,
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Luizzi VJ, Friberg M, Petrén H. Phenotypic plasticity in floral scent in response to nutrient, but not water, availability in the perennial plant
Arabis alpina. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13866] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Victoria J. Luizzi
- Department of Ecology & Evolutionary Biology University of Arizona Tucson AZ USA
- Department of Biology Lund University Lund Sweden
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Eisen KE, Geber MA, Raguso RA. Emission rates of species-specific volatiles vary across communities of Clarkia species: Evidence for multi-modal character displacement. Am Nat 2021; 199:824-840. [DOI: 10.1086/715501] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Mertens D, Boege K, Kessler A, Koricheva J, Thaler JS, Whiteman NK, Poelman EH. Predictability of Biotic Stress Structures Plant Defence Evolution. Trends Ecol Evol 2021; 36:444-456. [PMID: 33468354 DOI: 10.1016/j.tree.2020.12.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 12/11/2020] [Accepted: 12/17/2020] [Indexed: 12/16/2022]
Abstract
To achieve ecological and reproductive success, plants need to mitigate a multitude of stressors. The stressors encountered by plants are highly dynamic but typically vary predictably due to seasonality or correlations among stressors. As plants face physiological and ecological constraints in responses to stress, it can be beneficial for plants to evolve the ability to incorporate predictable patterns of stress in their life histories. Here, we discuss how plants predict adverse conditions, which plant strategies integrate predictability of biotic stress, and how such strategies can evolve. We propose that plants commonly optimise responses to correlated sequences or combinations of herbivores and pathogens, and that the predictability of these patterns is a key factor governing plant strategies in dynamic environments.
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Affiliation(s)
- Daan Mertens
- Laboratory of Entomology, Wageningen University and Research, P.O. Box 16, 6700 AA, Wageningen, The Netherlands.
| | - Karina Boege
- Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Apartado Postal 70-275, Coyoacán, C.P. 04510, Ciudad de México, Mexico
| | - André Kessler
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA
| | - Julia Koricheva
- Department of Biological Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK
| | | | - Noah K Whiteman
- Department of Integrative Biology, University of California-Berkeley, Berkeley, CA 94720, USA
| | - Erik H Poelman
- Laboratory of Entomology, Wageningen University and Research, P.O. Box 16, 6700 AA, Wageningen, The Netherlands.
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Kim YK, Lee S, Song JH, Kim MJ, Yunusbaev U, Lee ML, Kim MS, Kwon HW. Comparison of Biochemical Constituents and Contents in Floral Nectar of Castanea spp. Molecules 2020; 25:molecules25184225. [PMID: 32942597 PMCID: PMC7570523 DOI: 10.3390/molecules25184225] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/11/2020] [Accepted: 09/11/2020] [Indexed: 11/16/2022] Open
Abstract
Pollination is essential for efficient reproduction in pollinator-dependent crops that rely on the attraction of pollinators to flowers. Especially, floral nectar is considered to be an important factor attracting pollinator like honey bees, but differences among major chestnut species (Castanea crenata, C. mollissima, C. dentata, and C. sativa) are still little explored. This study aims to evaluate the value of honey source by analyzing floral nectar characteristics and comparing the composition of volatile organic compounds (VOCs) that mediate plant-pollinator interaction. In this study, we analyzed nectar samples obtained from male flowers using HPLC and HS-SPME/GC-MS. The five chestnuts showed significant differences between the volume of secreted nectar, free sugar composition, amino acid content and VOCs composition. Furthermore, C. crenata (Japanese cultivar 'Ungi') was revealed to emit the highest total amounts of VOCs and high levels of benzenoid compounds that are generally associated with flower-visiting insects. The sugar content per catkin, which is used to determine the honey yield, was the highest in C. crenata, suggesting that C. crenata 'Ungi' can be highly valued as a honey tree. Therefore, a better understanding of the relationship between pollinator and nectar characteristics of C. crenara could contribute to a prospective honey plant.
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Affiliation(s)
- Young Ki Kim
- Division of Special Forest Product, National Institute of Forest Science, 39 Onjeong-ro, Suwon 16631, Korea; (Y.K.K.); (J.H.S.); (M.J.K.)
| | - Sujin Lee
- Department of Life Sciences & Convergence Research Center for Insect Vectors, Incheon National University, 199 Academy-ro, Incheon 22012, Korea; (S.L.); (U.Y.); (M.-L.L.)
| | - Jeong Ho Song
- Division of Special Forest Product, National Institute of Forest Science, 39 Onjeong-ro, Suwon 16631, Korea; (Y.K.K.); (J.H.S.); (M.J.K.)
| | - Mahn Jo Kim
- Division of Special Forest Product, National Institute of Forest Science, 39 Onjeong-ro, Suwon 16631, Korea; (Y.K.K.); (J.H.S.); (M.J.K.)
| | - Ural Yunusbaev
- Department of Life Sciences & Convergence Research Center for Insect Vectors, Incheon National University, 199 Academy-ro, Incheon 22012, Korea; (S.L.); (U.Y.); (M.-L.L.)
| | - Myeong-Lyeol Lee
- Department of Life Sciences & Convergence Research Center for Insect Vectors, Incheon National University, 199 Academy-ro, Incheon 22012, Korea; (S.L.); (U.Y.); (M.-L.L.)
| | - Mun Seop Kim
- Division of Special Forest Product, National Institute of Forest Science, 39 Onjeong-ro, Suwon 16631, Korea; (Y.K.K.); (J.H.S.); (M.J.K.)
- Correspondence: (M.S.K.); (H.W.K.); Tel.: +82-31-290-1194 (M.S.K.); +82-32-835-8090 (H.W.K.)
| | - Hyung Wook Kwon
- Department of Life Sciences & Convergence Research Center for Insect Vectors, Incheon National University, 199 Academy-ro, Incheon 22012, Korea; (S.L.); (U.Y.); (M.-L.L.)
- Correspondence: (M.S.K.); (H.W.K.); Tel.: +82-31-290-1194 (M.S.K.); +82-32-835-8090 (H.W.K.)
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12
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Joffard N, Le Roncé I, Langlois A, Renoult J, Buatois B, Dormont L, Schatz B. Floral trait differentiation in Anacamptis coriophora: Phenotypic selection on scents, but not on colour. J Evol Biol 2020; 33:1028-1038. [PMID: 32500947 DOI: 10.1111/jeb.13657] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 05/14/2020] [Accepted: 05/23/2020] [Indexed: 01/26/2023]
Abstract
Current divergent selection may promote floral trait differentiation among conspecific populations in flowering plants. However, whether this applies to complex traits such as colour or scents has been little studied, even though these traits often vary within species. In this study, we compared floral colour and odour as well as selective pressures imposed upon these traits among seven populations belonging to three subspecies of the widespread, generalist orchid Anacamptis coriophora. Colour was characterized using calibrated photographs, and scents were sampled using dynamic headspace extraction and analysed using gas chromatography-mass spectrometry. We then quantified phenotypic selection exerted on these traits by regressing fruit set values on floral trait values. We showed that the three studied subspecies were characterized by different floral colour and odour, with one of the two predominant floral volatiles emitted by each subspecies being taxon-specific. Plant size was positively correlated with fruit set in most populations, whereas we found no apparent link between floral colour and female reproductive success. We detected positive selection on several taxon-specific compounds in A. coriophora subsp. fragrans, whereas no selection was found on floral volatiles of A. coriophora subsp. coriophora and A. coriophora subsp. martrinii. This study is one of the first to document variation in phenotypic selection exerted on floral scents among conspecific populations. Our results suggest that selection could contribute to ongoing chemical divergence among A. coriophora subspecies.
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Affiliation(s)
- Nina Joffard
- Centre d'Ecologie Fonctionnelle et Evolutive, EPHE-PSL, CNRS, Univ. Montpellier, Univ. Paul Valéry Montpellier 3, IRD, Montpellier, France
- Evolutionsbiologiskt Centrum (EBC), Uppsala, Sweden
| | - Iris Le Roncé
- Centre d'Ecologie Fonctionnelle et Evolutive, EPHE-PSL, CNRS, Univ. Montpellier, Univ. Paul Valéry Montpellier 3, IRD, Montpellier, France
- Département de biologie, École Normale Supérieure de Lyon, Lyon, France
| | - Alban Langlois
- Centre d'Ecologie Fonctionnelle et Evolutive, EPHE-PSL, CNRS, Univ. Montpellier, Univ. Paul Valéry Montpellier 3, IRD, Montpellier, France
- Université Toulouse III Paul Sabatier, Toulouse, France
| | - Julien Renoult
- Centre d'Ecologie Fonctionnelle et Evolutive, EPHE-PSL, CNRS, Univ. Montpellier, Univ. Paul Valéry Montpellier 3, IRD, Montpellier, France
| | - Bruno Buatois
- Centre d'Ecologie Fonctionnelle et Evolutive, EPHE-PSL, CNRS, Univ. Montpellier, Univ. Paul Valéry Montpellier 3, IRD, Montpellier, France
| | - Laurent Dormont
- Centre d'Ecologie Fonctionnelle et Evolutive, EPHE-PSL, CNRS, Univ. Montpellier, Univ. Paul Valéry Montpellier 3, IRD, Montpellier, France
| | - Bertrand Schatz
- Centre d'Ecologie Fonctionnelle et Evolutive, EPHE-PSL, CNRS, Univ. Montpellier, Univ. Paul Valéry Montpellier 3, IRD, Montpellier, France
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Dowell JA, Reynolds EC, Pliakas TP, Mandel JR, Burke JM, Donovan LA, Mason CM. Genome-Wide Association Mapping of Floral Traits in Cultivated Sunflower (Helianthus annuus). J Hered 2020; 110:275-286. [PMID: 30847479 DOI: 10.1093/jhered/esz013] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Accepted: 03/02/2019] [Indexed: 12/14/2022] Open
Abstract
Floral morphology and pigmentation are both charismatic and economically relevant traits associated with cultivated sunflower (Helianthus annuus L.). Recent work has linked floral morphology and pigmentation to pollinator efficiency and seed yield. Understanding the genetic architecture of such traits is essential for crop improvement, and gives insight into the role of genetic constraints in shaping floral diversity. A diversity panel of 288 sunflower genotypes was phenotyped for a variety of morphological, phenological, and color traits in both a greenhouse and a field setting. Association mapping was performed using 5788 SNP markers using a mixed linear model approach. Several dozen markers across 10 linkage groups were significantly associated with variation in morphological and color trait variation. Substantial trait plasticity was observed between greenhouse and field phenotyping, and associations differed between environments. Color traits mapped more strongly than morphology in both settings, with markers together explaining 16% of petal carotenoid content in the greenhouse, and 17% and 24% of variation in disc anthocyanin presence in the field and greenhouse, respectively. Morphological traits like disc size mapped more strongly in the field, with markers together explaining up to 19% of disc size variation. Loci identified here through association mapping within cultivated germplasm differ from those identified through biparental crosses between modern cultivated sunflower and either its wild progenitor or domesticated landraces. Several loci lie within genomic regions involved in domestication. Differences between phenotype expression under greenhouse and field conditions highlight the importance of plasticity in determining floral morphology and pigmentation.
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Affiliation(s)
- Jordan A Dowell
- Department of Biology, University of Central Florida, Orlando, FL
| | - Erin C Reynolds
- Department of Plant Biology, University of Georgia, Athens, GA
| | | | - Jennifer R Mandel
- Department of Biological Sciences, University of Memphis, Memphis, TN
| | - John M Burke
- Department of Plant Biology, University of Georgia, Athens, GA
| | - Lisa A Donovan
- Department of Plant Biology, University of Georgia, Athens, GA
| | - Chase M Mason
- Department of Biology, University of Central Florida, Orlando, FL.,Department of Plant Biology, University of Georgia, Athens, GA.,Arnold Arboretum, Harvard University, Boston, MA
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14
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Jantzen F, Lynch JH, Kappel C, Höfflin J, Skaliter O, Wozniak N, Sicard A, Sas C, Adebesin F, Ravid J, Vainstein A, Hilker M, Dudareva N, Lenhard M. Retracing the molecular basis and evolutionary history of the loss of benzaldehyde emission in the genus Capsella. THE NEW PHYTOLOGIST 2019; 224:1349-1360. [PMID: 31400223 DOI: 10.1111/nph.16103] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 07/18/2019] [Indexed: 05/13/2023]
Abstract
The transition from pollinator-mediated outbreeding to selfing has occurred many times in angiosperms. This is generally accompanied by a reduction in traits attracting pollinators, including reduced emission of floral scent. In Capsella, emission of benzaldehyde as a main component of floral scent has been lost in selfing C. rubella by mutation of cinnamate-CoA ligase CNL1. However, the biochemical basis and evolutionary history of this loss remain unknown, as does the reason for the absence of benzaldehyde emission in the independently derived selfer Capsella orientalis. We used plant transformation, in vitro enzyme assays, population genetics and quantitative genetics to address these questions. CNL1 has been inactivated twice independently by point mutations in C. rubella, causing a loss of enzymatic activity. Both inactive haplotypes are found within and outside of Greece, the centre of origin of C. rubella, indicating that they arose before its geographical spread. By contrast, the loss of benzaldehyde emission in C. orientalis is not due to an inactivating mutation in CNL1. CNL1 represents a hotspot for mutations that eliminate benzaldehyde emission, potentially reflecting the limited pleiotropy and large effect of its inactivation. Nevertheless, even closely related species have followed different evolutionary routes in reducing floral scent.
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Affiliation(s)
- Friederike Jantzen
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Straße 24-25, D-14476, Potsdam-Golm, Germany
| | - Joseph H Lynch
- Department of Biochemistry, Purdue University, 175 South University St., West Lafayette, IN, 47907-2063, USA
- Purdue Center for Plant Biology, Purdue University, West Lafayette, IN, 47907, USA
| | - Christian Kappel
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Straße 24-25, D-14476, Potsdam-Golm, Germany
| | - Jona Höfflin
- Institute of Biology, Dahlem Centre of Plant Sciences (DCPS), Freie Universität Berlin, Haderslebener Straße 9, 12163, Berlin, Germany
| | - Oded Skaliter
- Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, PO Box 12, 76100, Rehovot, Israel
| | - Natalia Wozniak
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Straße 24-25, D-14476, Potsdam-Golm, Germany
| | - Adrien Sicard
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Straße 24-25, D-14476, Potsdam-Golm, Germany
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, Uppsala, Sweden
| | - Claudia Sas
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Straße 24-25, D-14476, Potsdam-Golm, Germany
| | - Funmilayo Adebesin
- Department of Biochemistry, Purdue University, 175 South University St., West Lafayette, IN, 47907-2063, USA
- Purdue Center for Plant Biology, Purdue University, West Lafayette, IN, 47907, USA
| | - Jasmin Ravid
- Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, PO Box 12, 76100, Rehovot, Israel
| | - Alexander Vainstein
- Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, PO Box 12, 76100, Rehovot, Israel
| | - Monika Hilker
- Institute of Biology, Dahlem Centre of Plant Sciences (DCPS), Freie Universität Berlin, Haderslebener Straße 9, 12163, Berlin, Germany
| | - Natalia Dudareva
- Department of Biochemistry, Purdue University, 175 South University St., West Lafayette, IN, 47907-2063, USA
- Purdue Center for Plant Biology, Purdue University, West Lafayette, IN, 47907, USA
| | - Michael Lenhard
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Straße 24-25, D-14476, Potsdam-Golm, Germany
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15
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Chapurlat E, Ågren J, Anderson J, Friberg M, Sletvold N. Conflicting selection on floral scent emission in the orchid Gymnadenia conopsea. THE NEW PHYTOLOGIST 2019; 222:2009-2022. [PMID: 30767233 DOI: 10.1111/nph.15747] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 02/04/2019] [Indexed: 06/09/2023]
Abstract
Floral scent is a crucial trait for pollinator attraction. Yet only a handful of studies have estimated selection on scent in natural populations and no study has quantified the relative importance of pollinators and other agents of selection. In the fragrant orchid Gymnadenia conopsea, we used electroantennographic data to identify floral scent compounds detected by local pollinators and quantified pollinator-mediated selection on emission rates of 10 target compounds as well as on flowering start, visual display and spur length. Nocturnal pollinators contributed more to reproductive success than diurnal pollinators, but there was significant pollinator-mediated selection on both diurnal and nocturnal scent emission. Pollinators selected for increased emission of two compounds and reduced emission of two other compounds, none of which were major constituents of the total bouquet. In three cases, pollinator-mediated selection was opposed by nonpollinator-mediated selection, leading to weaker or no detectable net selection. Our study demonstrates that minor scent compounds can be targets of selection, that pollinators do not necessarily favour stronger scent signalling, and that some scent compounds are subject to conflicting selection from pollinators and other agents of selection. Hence, including floral scent traits into selection analysis is important for understanding the mechanisms behind floral evolution.
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Affiliation(s)
- Elodie Chapurlat
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 752 36, Uppsala, Sweden
| | - Jon Ågren
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 752 36, Uppsala, Sweden
| | - Joseph Anderson
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 752 36, Uppsala, Sweden
| | - Magne Friberg
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 752 36, Uppsala, Sweden
- Department of Biology, Lund University, SE-223 62, Lund, Sweden
| | - Nina Sletvold
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 752 36, Uppsala, Sweden
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16
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Kessler D, Bing J, Haverkamp A, Baldwin IT. The defensive function of a pollinator‐attracting floral volatile. Funct Ecol 2019. [DOI: 10.1111/1365-2435.13332] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Danny Kessler
- Department of Molecular Ecology Max Planck Institute for Chemical Ecology Jena Germany
| | - Julia Bing
- Department of Molecular Ecology Max Planck Institute for Chemical Ecology Jena Germany
| | - Alexander Haverkamp
- Department of Neuroethology Max Planck Institute for Chemical Ecology Jena Germany
| | - Ian T. Baldwin
- Department of Molecular Ecology Max Planck Institute for Chemical Ecology Jena Germany
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17
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Mechanisms of Resistance to Insect Herbivores in Isolated Breeding Lineages of Cucurbita pepo. J Chem Ecol 2019; 45:313-325. [DOI: 10.1007/s10886-019-01046-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 11/05/2018] [Accepted: 01/15/2019] [Indexed: 10/27/2022]
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18
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Chapurlat E, Anderson J, Ågren J, Friberg M, Sletvold N. Diel pattern of floral scent emission matches the relative importance of diurnal and nocturnal pollinators in populations of Gymnadenia conopsea. ANNALS OF BOTANY 2018; 121:711-721. [PMID: 29360931 PMCID: PMC5853007 DOI: 10.1093/aob/mcx203] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
BACKGROUND AND AIMS Floral scent is considered an integral component of pollination syndromes, and its composition and timing of emission are thus expected to match the main pollinator type and time of activity. While floral scent differences among plant species with different pollination systems can be striking, studies on intraspecific variation are sparse, which limits our understanding of the role of pollinators in driving scent divergence. METHODS Here, we used dynamic headspace sampling to quantify floral scent emission and composition during the day and at night in the natural habitat of six Scandinavian populations of the fragrant orchid Gymnadenia conopsea. We tested whether diel scent emission and composition match pollinator type by comparing four populations in southern Sweden, where nocturnal pollinators are more important for plant reproductive success than are diurnal pollinators, with two populations in central Norway, where the opposite is true. To determine to what extent scent patterns quantified in the field reflected plasticity, we also measured scent emission in a common growth chamber environment. KEY RESULTS Both scent composition and emission rates differed markedly between day and night, but only the latter varied significantly among populations. The increase in scent emission rate at night was considerably stronger in the Swedish populations compared with the Norwegian populations. These patterns persisted when plants were transferred to a common environment, suggesting a genetic underpinning of the scent variation. CONCLUSIONS The results are consistent with a scenario where spatial variation in relative importance of nocturnal and diurnal pollinators has resulted in selection for different scent emission rhythms. Our study highlights the importance of adding a characterization of diel variation of scent emission rates to comparative studies of floral scent, which so far have often focused on scent composition only.
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Affiliation(s)
- Elodie Chapurlat
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen, Sweden
- For correspondence. E-mail
| | - Joseph Anderson
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen, Sweden
| | - Jon Ågren
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen, Sweden
| | - Magne Friberg
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen, Sweden
| | - Nina Sletvold
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen, Sweden
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19
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Schöner MG, Schöner CR, Kerth G, Ji LL, Grafe TU. Bats Attend to Plant Structures to Identify Roosting Sites. ACTA CHIROPTEROLOGICA 2016. [DOI: 10.3161/15081109acc2016.18.2.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Michael G. Schöner
- Zoological Institute and Museum, University of Greifswald, J.-S.-Bach-Strasse 11/12, 17489 Greifswald, Germany
| | - Caroline R. Schöner
- Zoological Institute and Museum, University of Greifswald, J.-S.-Bach-Strasse 11/12, 17489 Greifswald, Germany
| | - Gerald Kerth
- Zoological Institute and Museum, University of Greifswald, J.-S.-Bach-Strasse 11/12, 17489 Greifswald, Germany
| | - Liaw Lin Ji
- Faculty of Science, University Brunei Darussalam, Tungku Link, Gadong 1410, Brunei Darussalam
| | - T. Ulmar Grafe
- Faculty of Science, University Brunei Darussalam, Tungku Link, Gadong 1410, Brunei Darussalam
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20
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Jiang Y, Ye J, Li S, Niinemets Ü. Regulation of Floral Terpenoid Emission and Biosynthesis in Sweet Basil ( Ocimum basilicum). JOURNAL OF PLANT GROWTH REGULATION 2016; 35:921-935. [PMID: 29367803 PMCID: PMC5777610 DOI: 10.1007/s00344-016-9591-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Past studies have focused on the composition of essential oil of Ocimum basilicum leaves, but data on composition and regulation of its aerial emissions, especially floral volatile emissions are scarce. We studied the chemical profile, within-flower spatial distribution (sepals, petals, pistils with stamina and pedicels), diurnal emission kinetics and effects of exogenous methyl jasmonate (MeJA) application on the emission of floral volatiles by dynamic headspace collection and identification using gas chromatography-mass spectrometry (GC-MS) and proton transfer reaction mass spectrometry (PTR-MS). We observed more abundant floral emissions from flowers compared with leaves. Sepals were the main emitters of floral volatiles among the flower parts studied. The emissions of lipoxygenase compounds (LOX) and monoterpenoids, but not sesquiterpene emissions, displayed a diurnal variation driven by light. Response to exogenous MeJA treatment of flowers consisted of a rapid stress response and a longer-term acclimation response. The initial response was associated with enhanced emissions of fatty acid derivatives, monoterpenoids, and sesquiterpenoids without variation of the composition of individual compounds. The longer-term response was associated with enhanced monoterpenoid and sesquiterpenoid emissions with profound changes in the emission spectrum. According to correlated patterns of terpenoid emission changes upon stress, highlighted by a hierarchical cluster analysis, candidate terpenoid synthases responsible for observed diversity and complexity of released terpenoid blends were postulated. We conclude that flower volatile emissions differ quantitatively and qualitatively from leaf emissions, and overall contribute importantly to O. basilicum flavor, especially under stress conditions.
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Affiliation(s)
- Yifan Jiang
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
- College of Art, Changzhou University, Gehu 1, Changzhou, 213164, Jiangsu, China
| | - Jiayan Ye
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
| | - Shuai Li
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
| | - Ülo Niinemets
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
- Estonian Academy of Sciences, Kohtu 6, Tallinn 10130, Estonia
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21
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Nunes CEP, Peñaflor MFGV, Bento JMS, Salvador MJ, Sazima M. The dilemma of being a fragrant flower: the major floral volatile attracts pollinators and florivores in the euglossine-pollinated orchid Dichaea pendula. Oecologia 2016; 182:933-946. [PMID: 27538674 DOI: 10.1007/s00442-016-3703-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 08/09/2016] [Indexed: 01/01/2023]
Abstract
Volatile organic compounds (VOCs) mediate both mutualistic and antagonistic plant-animal interactions; thus, the attraction of mutualists and antagonists by floral VOCs constitutes an important trade-off in the evolutionary ecology of angiosperms. Here, we evaluate the role of VOCs in mediating communication between the plant and its mutualist and antagonist floral visitors. To assess the evolutionary consequences of VOC-mediated signalling to distinct floral visitors, we studied the reproductive ecology of Dichaea pendula, assessing the effects of florivores on fruit set, the pollination efficiency of pollinators and florivores, the floral scent composition and the attractiveness of the major VOC to pollinators and florivores. The orchid depends entirely on orchid-bees for sexual reproduction, and the major florivores, the weevils, feed on corollas causing self-pollination, triggering abortion of 26.4 % of the flowers. Floral scent was composed of approximately 99 % 2-methoxy-4-vinylphenol, an unusual floral VOC attractive to pollinators and florivores. The low fruit set from natural pollination (5.6 %) compared to hand cross-pollination (45.5 %) and low level of pollinator visitation [0.02 visits (flower hour)-1] represent the limitations to pollination. Our research found that 2-methoxy-4-vinylphenol mediates both mutualistic and antagonistic interactions, which could result in contrary evolutionary pressures on novo-emission. The scarcity of pollinators, not florivory, was the major constraint to fruit set. Our results suggest that, rather than anti-florivory adaptations, adaptations to enhance pollinator attraction and cross-pollination might be the primary drivers of the evolution of VOC emission in euglossine-pollinated flowers.
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Affiliation(s)
- Carlos E P Nunes
- Graduate Program in Plant Biology, University of Campinas, Rua Monteiro Lobato 255, Cidade Universitária "Zeferino Vaz", Campinas, 13083-970, Brazil.
| | - Maria Fernanda G V Peñaflor
- Department of Entomology and Acarology, University of São Paulo, Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ), Piracicaba, Brazil
| | - José Maurício S Bento
- Department of Entomology and Acarology, University of São Paulo, Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ), Piracicaba, Brazil
| | - Marcos José Salvador
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Brazil
| | - Marlies Sazima
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Brazil
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22
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Brzozowski L, Leckie BM, Gardner J, Hoffmann MP, Mazourek M. Curcurbita pepo subspecies delineates striped cucumber beetle (Acalymma vittatum) preference. HORTICULTURE RESEARCH 2016; 3:16028. [PMID: 27347423 PMCID: PMC4908230 DOI: 10.1038/hortres.2016.28] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 04/21/2016] [Accepted: 05/10/2016] [Indexed: 05/29/2023]
Abstract
The striped cucumber beetle (Acalymma vittatum (F.)) is a destructive pest of cucurbit crops, and management could be improved by host plant resistance, especially in organic farming systems. However, despite the variation in striped cucumber beetle preference observed within the economically important species, Cucurbita pepo L., plant breeders and entomologists lacked a simple framework to classify and exploit these differences. This study used recent phylogenetic evidence and bioassays to organize striped cucumber beetle preference within C. pepo. Our results indicate preference contrasts between the two agriculturally relevant subspecies: C. pepo subsp. texana and C. pepo subsp. pepo. Plants of C. pepo subsp. pepo were more strongly preferred than C. pepo subsp. texana plants. This structure of beetle preference in C. pepo will allow plant breeders and entomologists to better focus research efforts on host plant non-preference to control striped cucumber beetles.
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Affiliation(s)
- L Brzozowski
- Section of Plant Breeding and Genetics, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA
| | - B M Leckie
- School of Agriculture, Tennessee Tech University, Cookeville, TN, USA
| | - J Gardner
- Department of Entomology, Cornell University, Ithaca, NY, USA
| | - M P Hoffmann
- Department of Entomology, Cornell University, Ithaca, NY, USA
| | - M Mazourek
- Section of Plant Breeding and Genetics, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA
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23
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Johnson TS, Schwieterman ML, Kim JY, Cho KH, Clark DG, Colquhoun TA. Lilium floral fragrance: A biochemical and genetic resource for aroma and flavor. PHYTOCHEMISTRY 2016; 122:103-112. [PMID: 26654856 DOI: 10.1016/j.phytochem.2015.11.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 11/10/2015] [Accepted: 11/19/2015] [Indexed: 05/08/2023]
Abstract
Hybrid Lilium (common name lily) cultivars are among the top produced domestic fresh cut flowers and potted plants in the US today. Many hybrid Lilium cultivars produce large and showy flowers that emit copious amounts of volatile molecules, which can negatively affect a consumer's appreciation or limit use of the plant product. There are few publications focused on the biochemistry, genetics, and/or molecular regulation of floral volatile biosynthesis for Lilium cultivars. In an initial pursuit to provide breeders with molecular markers for floral volatile biosynthesis, a total of five commercially available oriental and oriental-trumpet hybrid Lilium cultivars were selected for analytical characterization of floral volatile emission. In total, 66 volatile molecules were qualified and quantitated among all cultivars. Chemical classes of identified volatiles include monoterpene hydrocarbons, monoterpene alcohols and aldehydes, phenylpropanoids, benzenoids, fatty-acid-derived, nitrogen-containing, and amino-acid-derived compounds. In general, the floral volatile profiles of the three oriental-trumpet hybrids were dominated by monoterpene hydrocarbons, monoterpene alcohols and aldehydes, while the two oriental hybrids were dominated by monoterpene alcohols and aldehydes and phenylpropanoids, respectively. Tepal tissues (two petal whirls) emitted the vast majority of total volatile molecules compared to the reproductive organs of the flowers. Tepal volatile profiles were cultivar specific with a high degree of distinction, which indicates the five cultivars chosen will provide an excellent differential genetic environment for gene discovery through comparative transcriptomics in the future. Cloning and assaying transcript accumulation from four floral volatile biosynthetic candidates provided few immediate or obvious trends with floral volatile emission.
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Affiliation(s)
- Timothy S Johnson
- Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL 32611, USA; Plant Innovation Center, University of Florida, Gainesville, FL 32611, USA
| | - Michael L Schwieterman
- Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL 32611, USA; Environmental Horticulture Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611, USA; Plant Innovation Center, University of Florida, Gainesville, FL 32611, USA
| | - Joo Young Kim
- Environmental Horticulture Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611, USA; Plant Innovation Center, University of Florida, Gainesville, FL 32611, USA
| | - Keun H Cho
- Environmental Horticulture Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611, USA; Plant Innovation Center, University of Florida, Gainesville, FL 32611, USA
| | - David G Clark
- Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL 32611, USA; Environmental Horticulture Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611, USA; Plant Innovation Center, University of Florida, Gainesville, FL 32611, USA
| | - Thomas A Colquhoun
- Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL 32611, USA; Environmental Horticulture Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611, USA; Plant Innovation Center, University of Florida, Gainesville, FL 32611, USA.
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24
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Junker RR. Multifunctional and Diverse Floral Scents Mediate Biotic Interactions Embedded in Communities. SIGNALING AND COMMUNICATION IN PLANTS 2016. [DOI: 10.1007/978-3-319-33498-1_11] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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25
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Kessler D, Kallenbach M, Diezel C, Rothe E, Murdock M, Baldwin IT. How scent and nectar influence floral antagonists and mutualists. eLife 2015; 4:e07641. [PMID: 26132861 PMCID: PMC4530224 DOI: 10.7554/elife.07641] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2015] [Accepted: 06/30/2015] [Indexed: 02/01/2023] Open
Abstract
Many plants attract and reward pollinators with floral scents and nectar, respectively, but these traits can also incur fitness costs as they also attract herbivores. This dilemma, common to most flowering plants, could be solved by not producing nectar and/or scent, thereby cheating pollinators. Both nectar and scent are highly variable in native populations of coyote tobacco, Nicotiana attenuata, with some producing no nectar at all, uncorrelated with the tobacco's main floral attractant, benzylacetone. By silencing benzylacetone biosynthesis and nectar production in all combinations by RNAi, we experimentally uncouple these floral rewards/attractrants and measure their costs/benefits in the plant's native habitat and experimental tents. Both scent and nectar increase outcrossing rates for three, separately tested, pollinators and both traits increase oviposition by a hawkmoth herbivore, with nectar being more influential than scent. These results underscore that it makes little sense to study floral traits as if they only mediated pollination services.
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Affiliation(s)
- Danny Kessler
- Department of Molecular Ecology, Max-Planck Institute for Chemical Ecology, Jena, Germany
| | - Mario Kallenbach
- Department of Molecular Ecology, Max-Planck Institute for Chemical Ecology, Jena, Germany
| | - Celia Diezel
- Department of Molecular Ecology, Max-Planck Institute for Chemical Ecology, Jena, Germany
| | - Eva Rothe
- Department of Molecular Ecology, Max-Planck Institute for Chemical Ecology, Jena, Germany
| | - Mark Murdock
- Department of Molecular Ecology, Max-Planck Institute for Chemical Ecology, Jena, Germany
| | - Ian T Baldwin
- Department of Molecular Ecology, Max-Planck Institute for Chemical Ecology, Jena, Germany
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Milet-Pinheiro P, Ayasse M, Dötterl S. Visual and Olfactory Floral Cues of Campanula (Campanulaceae) and Their Significance for Host Recognition by an Oligolectic Bee Pollinator. PLoS One 2015; 10:e0128577. [PMID: 26060994 PMCID: PMC4465695 DOI: 10.1371/journal.pone.0128577] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 04/28/2015] [Indexed: 11/19/2022] Open
Abstract
Oligolectic bees collect pollen from a few plants within a genus or family to rear their offspring, and are known to rely on visual and olfactory floral cues to recognize host plants. However, studies investigating whether oligolectic bees recognize distinct host plants by using shared floral cues are scarce. In the present study, we investigated in a comparative approach the visual and olfactory floral cues of six Campanula species, of which only Campanula lactiflora has never been reported as a pollen source of the oligolectic bee Ch. rapunculi. We hypothesized that the flowers of Campanula species visited by Ch. rapunculi share visual (i.e. color) and/or olfactory cues (scents) that give them a host-specific signature. To test this hypothesis, floral color and scent were studied by spectrophotometric and chemical analyses, respectively. Additionally, we performed bioassays within a flight cage to test the innate color preference of Ch. rapunculi. Our results show that Campanula flowers reflect the light predominantly in the UV-blue/blue bee-color space and that Ch. rapunculi displays a strong innate preference for these two colors. Furthermore, we recorded spiroacetals in the floral scent of all Campanula species, but Ca. lactiflora. Spiroacetals, rarely found as floral scent constituents but quite common among Campanula species, were recently shown to play a key function for host-flower recognition by Ch. rapunculi. We conclude that Campanula species share some visual and olfactory floral cues, and that neurological adaptations (i.e. vision and olfaction) of Ch. rapunculi innately drive their foraging flights toward host flowers. The significance of our findings for the evolution of pollen diet breadth in bees is discussed.
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Affiliation(s)
| | - Manfred Ayasse
- Institute of Experimental Ecology, University of Ulm, Ulm, Germany
| | - Stefan Dötterl
- Department of Plant Systematics, University of Bayreuth, Bayreuth, Germany
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Bischoff M, Raguso RA, Jürgens A, Campbell DR. Context-dependent reproductive isolation mediated by floral scent and color. Evolution 2014; 69:1-13. [PMID: 25354994 DOI: 10.1111/evo.12558] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Accepted: 10/08/2014] [Indexed: 11/28/2022]
Abstract
Reproductive isolation due to pollinator behavior is considered a key mode of speciation in flowering plants. Although floral scent is thought to mediate pollinator behavior, little is known about its effects on pollinator attraction and floral visitation in the wild. We used field experiments with wild hawkmoths and laboratory experiments with naïve hawkmoths to investigate attraction to and probing of flowers in response to indole, a volatile emitted by Ipomopsis tenuituba but not its close relative I. aggregata, both alone and in combination with floral color differences. We demonstrated that indole attracts wild hawkmoths to flowers, but has little effect on the rate at which those attracted moths probe flowers. In contrast, white flower color did not influence hawkmoth attraction in the field, but caused more attracted moths to probe flowers. Thus, the moths require both scent and high visual contrast, in that order, to feed at flowers at dusk. Their preference for indole-scented flowers is innate, but species-specific preference is mitigated by previous experience and plant spatial patterning. This context-dependent behavior helps explain why these Ipomopsis species show geographical variation in the extent of hybridization and may potentially explain formation of hybrid bridges in other systems of hawkmoth-pollinated plants.
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Affiliation(s)
- Mascha Bischoff
- Department of Ecology and Evolutionary Biology, University of California, Irvine, California, 92697; Rocky Mountain Biological Laboratory, Crested Butte, Colorado, 81224; Department of Neurobiology and Behavior, Cornell University, Ithaca, New York, 14853
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28
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Carvalho AT, Dötterl S, Schlindwein C. An aromatic volatile attracts oligolectic bee pollinators in an interdependent bee-plant relationship. J Chem Ecol 2014; 40:1126-34. [PMID: 25315355 DOI: 10.1007/s10886-014-0510-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Revised: 08/17/2014] [Accepted: 09/25/2014] [Indexed: 11/26/2022]
Abstract
Chemical signals emitted by the plant frequently mediate host-plant localization in specialized animal - plant associations. Studying the interdependent highly specialized association of the narrowly oligolectic bee pollinator Protodiscelis palpalis (Colletidae, Neopasiphaeinae) with Hydrocleys martii (Alismataceae) in ephemeral aquatic water bodies in semi-arid Caatinga of Brazil, we asked if specific volatile compounds produced by the flowers mediate pollinator attraction. The yellow Hydrocleys flowers are the sole pollen and nectar resources, and mating sites for the bees. We analyzed the floral scents of this species and of the closely related H. nymphoides, which is not visited by P. palpalis, and tested the main volatile compounds of both species under field conditions to evaluate their attractiveness to bees of P. palpalis. Methoxylated aromatics were the dominant floral scent components in both species, but each species exhibited a characteristic scent profile. Dual choice bioassays using artificial flowers made of yellow and blue adhesive paper clearly revealed that ρ-methylanisole alone, the dominant volatile of H. martii, attracted significantly more bees than unbaited flowers. This compound represents an olfactory communication channel used by the plant that lures its effective oligolectic pollinators to its flowers. Yellow artificial flowers baited significantly more bees than blue ones. Our study reinforces the recent findings that specific compounds in complex floral scent bouquets are crucial for host-plant location in oligolectic bees.
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Affiliation(s)
- Airton Torres Carvalho
- Programa de Pós-graduação em Ciências Biológicas (Zoologia), Universidade Federal da Paraíba, Cidade Universitária, 58059-900, João Pessoa, PB, Brazil
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29
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Blande JD, Holopainen JK, Niinemets Ü. Plant volatiles in polluted atmospheres: stress responses and signal degradation. PLANT, CELL & ENVIRONMENT 2014; 37:1892-904. [PMID: 24738697 PMCID: PMC4289706 DOI: 10.1111/pce.12352] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 04/05/2014] [Indexed: 05/18/2023]
Abstract
Plants emit a plethora of volatile organic compounds, which provide detailed information on the physiological condition of emitters. Volatiles induced by herbivore feeding are among the best studied plant responses to stress and may constitute an informative message to the surrounding community and further function in plant defence processes. However, under natural conditions, plants are potentially exposed to multiple concurrent stresses with complex effects on the volatile emissions. Atmospheric pollutants are an important facet of the abiotic environment and can impinge on a plant's volatile-mediated defences in multiple ways at multiple temporal scales. They can exert changes in volatile emissions through oxidative stress, as is the case with ozone pollution. The pollutants, in particular, ozone, nitrogen oxides and hydroxyl radicals, also react with volatiles in the atmosphere. These reactions result in volatile breakdown products, which may themselves be perceived by community members as informative signals. In this review, we demonstrate the complex interplay among stresses, emitted signals, and modification in signal strength and composition by the atmosphere, collectively determining the responses of the biotic community to elicited signals.
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Affiliation(s)
- James D. Blande
- Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, FIN-70211 Kuopio, Finland
| | - Jarmo K. Holopainen
- Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, FIN-70211 Kuopio, Finland
| | - Ülo Niinemets
- Department of Plant Physiology, Estonian University of Life Sciences, Kreutzwaldi 1, 51014 Tartu, Estonia
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30
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Muhlemann JK, Klempien A, Dudareva N. Floral volatiles: from biosynthesis to function. PLANT, CELL & ENVIRONMENT 2014; 37:1936-49. [PMID: 24588567 DOI: 10.1111/pce.12314] [Citation(s) in RCA: 230] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 02/11/2014] [Accepted: 02/18/2014] [Indexed: 05/20/2023]
Abstract
Floral volatiles have attracted humans' attention since antiquity and have since then permeated many aspects of our lives. Indeed, they are heavily used in perfumes, cosmetics, flavourings and medicinal applications. However, their primary function is to mediate ecological interactions between flowers and a diverse array of visitors, including pollinators, florivores and pathogens. As such, they ultimately ensure the plants' reproductive and evolutionary success. To date, over 1700 floral volatile organic compounds (VOCs) have been identified. Interestingly, they are derived from only a few biochemical networks, which include the terpenoid, phenylpropanoid/benzenoid and fatty acid biosynthetic pathways. These pathways are intricately regulated by endogenous and external factors to enable spatially and temporally controlled emission of floral volatiles, thereby fine-tuning the ecological interactions facilitated by floral volatiles. In this review, we will focus on describing the biosynthetic pathways leading to floral VOCs, the regulation of floral volatile emission, as well as biological functions of emitted volatiles.
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Affiliation(s)
- Joëlle K Muhlemann
- Department of Biochemistry, Purdue University, West Lafayette, IN, 47907, USA
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31
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The Chemical Basis of Host-Plant Recognition in a Specialized Bee Pollinator. J Chem Ecol 2013; 39:1347-60. [DOI: 10.1007/s10886-013-0363-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 08/26/2013] [Accepted: 10/15/2013] [Indexed: 10/26/2022]
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Buchanan AL, Underwood N. Attracting pollinators and avoiding herbivores: insects influence plant traits within and across years. Oecologia 2013; 173:473-82. [PMID: 23456243 DOI: 10.1007/s00442-013-2629-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Accepted: 02/12/2013] [Indexed: 11/29/2022]
Abstract
Perennial plants interact with herbivores and pollinators across multiple growing seasons, and thus may respond to herbivores and pollinators both within and across years. Joint effects of herbivores and pollinators influence plant traits, but while some of the potential interactions among herbivory, pollination, plant size, and plant reproductive traits have been well studied, others are poorly understood. This is particularly true for perennial plants where effects of herbivores and pollinators may manifest across years. Here, we describe two experiments addressing the reciprocal interactions of plant traits with herbivore damage and pollination across 2 years using the perennial plant Chamerion angustifolium. We measured (1) plant responses to manipulation of damage and pollination in the year of treatment and the subsequent season, (2) damage and pollination responses to manipulation of plant size and flowering traits in the year of treatment, and (3) plant-mediated indirect interactions between herbivores and pollinators. We found that plant traits had little effect on damage and pollination, but damage and pollination affected plant traits in both the treatment year and the subsequent year. We found evidence of indirect effects between leaf herbivores and pollinators in both directions; indirect effects of pollinators on leaf herbivores have not been previously demonstrated. Our results indicate that pollen receipt results in shorter plants with fewer stems but does not change flower number, while leaf herbivory results in taller plants with fewer flowers. Together, herbivory and pollination may contribute to intermediate plant height and plants with fewer stems and flowers in our system.
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Affiliation(s)
- Amanda Lynn Buchanan
- Department of Biological Science, Ecology and Evolution, Florida State University, 319 Stadium Drive, Tallahassee, FL, 32306-4295, USA,
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Kessler D, Diezel C, Clark DG, Colquhoun TA, Baldwin IT. Petunia flowers solve the defence/apparency dilemma of pollinator attraction by deploying complex floral blends. Ecol Lett 2012; 16:299-306. [PMID: 23173705 DOI: 10.1111/ele.12038] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 07/29/2012] [Accepted: 10/21/2012] [Indexed: 11/28/2022]
Abstract
Flowers recruit floral visitors for pollination services by emitting fragrances. These scent signals can be intercepted by antagonists such as florivores to locate host plants. Hence, as a consequence of interactions with both mutualists and antagonists, floral bouquets likely consist of both attractive and defensive components. While the attractive functions of floral bouquets have been studied, their defensive function has not, and field-based evidence for the deterrence of floral-scent constituents is lacking. In field and glasshouse experiments with five lines of transgenic Petunia x hybrida plants specifically silenced in their ability to release particular components of their floral volatile bouquet, we demonstrate that the emission of single floral-scent compounds can dramatically decrease damage from generalist florivores. While some compounds are used in host location, others prevent florivory. We conclude that the complex blends that comprise floral scents are likely sculpted by the selective pressures of both pollinators and herbivores.
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Affiliation(s)
- Danny Kessler
- Department of Molecular Ecology, Max-Planck-Institute for Chemical Ecology, Hans-Knöll-Str. 8, DE-07745, Jena, Germany
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34
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Shapiro L, De Moraes CM, Stephenson AG, Mescher MC. Pathogen effects on vegetative and floral odours mediate vector attraction and host exposure in a complex pathosystem. Ecol Lett 2012; 15:1430-8. [DOI: 10.1111/ele.12001] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 07/24/2012] [Accepted: 08/16/2012] [Indexed: 11/29/2022]
Affiliation(s)
- Lori Shapiro
- Department of Entomology; Pennsylvania State University; University Park PA 16802 USA
| | - Consuelo M. De Moraes
- Department of Entomology; Pennsylvania State University; University Park PA 16802 USA
| | - Andrew G. Stephenson
- Department of Biology; Pennsylvania State University; University Park PA 16802 USA
| | - Mark C. Mescher
- Department of Entomology; Pennsylvania State University; University Park PA 16802 USA
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35
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Ehrlén J, Borg-Karlson AK, Kolb A. Selection on plant optical traits and floral scent: Effects via seed development and antagonistic interactions. Basic Appl Ecol 2012. [DOI: 10.1016/j.baae.2012.08.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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36
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Schäffler I, Balao F, Dötterl S. Floral and vegetative cues in oil-secreting and non-oil-secreting Lysimachia species. ANNALS OF BOTANY 2012; 110:125-38. [PMID: 22634256 PMCID: PMC3380597 DOI: 10.1093/aob/mcs101] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 03/23/2012] [Indexed: 05/30/2023]
Abstract
BACKGROUND AND AIMS Unrelated plants pollinated by the same group or guild of animals typically evolve similar floral cues due to pollinator-mediated selection. Related plant species, however, may possess similar cues either as a result of pollinator-mediated selection or as a result of sharing a common ancestor that possessed the same cues or traits. In this study, visual and olfactory floral cues in Lysimachia species exhibiting different pollination strategies were analysed and compared, and the importance of pollinators and phylogeny on the evolution of these floral cues was determined. For comparison, cues of vegetative material were examined where pollinator selection would not be expected. METHODS Floral and vegetative scents and colours in floral oil- and non-floral oil-secreting Lysimachia species were studied by chemical and spectrophotometric analyses, respectively, compared between oil- and non-oil-secreting species, and analysed by phylogenetically controlled methods. KEY RESULTS Vegetative and floral scent was species specific, and variability in floral but not vegetative scent was lower in oil compared with non-oil species. Overall, oil species did not differ in their floral or vegetative scent from non-oil species. However, a correlation was found between oil secretion and six floral scent constituents specific to oil species, whereas the presence of four other floral compounds can be explained by phylogeny. Four of the five analysed oil species had bee-green flowers and the pattern of occurrence of this colour correlated with oil secretion. Non-oil species had different floral colours. The colour of leaves was similar among all species studied. CONCLUSIONS Evidence was found for correlated evolution between secretion of floral oils and floral but not vegetative visual and olfactory cues. The cues correlating with oil secretion were probably selected by Macropis bees, the specialized pollinators of oil-secreting Lysimachia species, and may have evolved in order to attract these bees.
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Affiliation(s)
- I. Schäffler
- Department of Plant Systematics, University of Bayreuth, D-95440 Bayreuth, Germany
| | - F. Balao
- Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Apdo. 1095, E-41080 Sevilla, Spain
| | - S. Dötterl
- Department of Plant Systematics, University of Bayreuth, D-95440 Bayreuth, Germany
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Zhuang X, Fiesselmann A, Zhao N, Chen H, Frey M, Chen F. Biosynthesis and emission of insect herbivory-induced volatile indole in rice. PHYTOCHEMISTRY 2012; 73:15-22. [PMID: 22000657 DOI: 10.1016/j.phytochem.2011.08.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 08/12/2011] [Accepted: 08/30/2011] [Indexed: 05/28/2023]
Abstract
Insect-damaged rice plants emit a complex mixture of volatiles that are highly attractive to parasitic wasps. Indole is one constituent of insect-induced rice volatiles, and is produced in plants by the enzyme indole-3-glycerol phosphate lyase (IGL). The alpha-subunit of tryptophan synthase (TSA) is the IGL that catalyses the conversion of indole-3-glycerol phosphate to indole in the alpha-reaction of tryptophan synthesis; however, TSA is only active in the complex with the beta-subunit of tryptophan synthase and is not capable of producing free indole. In maize a TSA homolog, ZmIgl, is the structural gene responsible for volatile indole biosynthesis. Bioinformatic analysis based on the ZmIgl-sequence indicated that the rice genome contains five homologous genes. Three homologs Os03g58260, Os03g58300 and Os07g08430, have detectable transcript levels in seedling tissue and were expressed in both insect-damaged and control rice plants. Only Os03g58300, however, was up-regulated by insect feeding. Recombinant proteins of the three rice genes were tested for IGL activity. Os03g58300 had a low K(m) for indole-3-glycerol phosphate and a high k(cat), and hence can efficiently produce indole. Os07g08430 exhibited biochemical properties resembling characterized TSAs. In contrast, Os03g58260 was inactive as a monomer. Analysis of Os03g58300 expression and indole emission provides further support that Os03g58300 is the bona fide rice IGL for biosynthesis of indole, in analogy to maize, this gene is termed OsIgl. Phylogenetic analysis showed that the rice genes are localized in two distinct clades together with the maize genes ZmIgl and ZmBx1 (Os03g58300) and ZmTSA (Os03g58260 and Os07g08430). The genes in the two clades have distinct enzyme activities and gene structures in terms of intron/exon organization. These results suggest that OsIgl evolved after the split of monocot and dicot lineages and before the diversification of the Poaceae.
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Affiliation(s)
- Xiaofeng Zhuang
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA
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Kessler A, Halitschke R, Poveda K. Herbivory-mediated pollinator limitation: negative impacts of induced volatiles on plant-pollinator interactions. Ecology 2011; 92:1769-80. [PMID: 21939073 DOI: 10.1890/10-1945.1] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Although induced plant responses to herbivory are well studied as mechanisms of resistance, how induction shapes community interactions and ultimately plant fitness is still relatively unknown. Using a wild tomato, Solanum peruvianum, native to the Peruvian Andes, we evaluated the disruption of pollination as a potential ecological cost of induced responses. More specifically, we tested the hypothesis that metabolic changes in herbivore-attacked plants, such as the herbivore-induced emission of volatile organic compounds (VOCs), alter pollinator behavior and consequentially affect plant fitness. We conducted a series of manipulative field experiments to evaluate the role of herbivore-induced vegetative and floral VOC emissions as mechanisms by which herbivory affects pollinator behavior. In field surveys and bioassays in the plants' native habitat, we found that real and simulated herbivory (methyl jasmonate application) reduced attractiveness of S. peruvianum flowers to their native pollinators. We show that reduced pollinator preference, not resource limitation due to leaf tissue removal, resulted in reduced seed set. Solitary bee pollinators use floral plant volatiles, emitted in response to herbivory or methyl jasmonate treatment, as cues to avoid inflorescences on damaged plants. This herbivory-induced pollinator limitation can be viewed as a general cost of induced plant responses as well as a specific cost of herbivory-induced volatile emission.
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Affiliation(s)
- André Kessler
- Cornell University, Department of Ecology and Evolutionary Biology, Ithaca, New York 14853, USA.
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Behavioural plasticity and sex differences in host finding of a specialized bee species. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2011; 197:1119-26. [DOI: 10.1007/s00359-011-0673-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Revised: 08/10/2011] [Accepted: 08/11/2011] [Indexed: 10/17/2022]
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Rodriguez-Saona C, Parra L, Quiroz A, Isaacs R. Variation in highbush blueberry floral volatile profiles as a function of pollination status, cultivar, time of day and flower part: implications for flower visitation by bees. ANNALS OF BOTANY 2011; 107:1377-1390. [PMID: 21498566 PMCID: PMC3101143 DOI: 10.1093/aob/mcr077] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Revised: 01/05/2011] [Accepted: 02/22/2011] [Indexed: 05/29/2023]
Abstract
BACKGROUND AND AIMS Studies of the effects of pollination on floral scent and bee visitation remain rare, particularly in agricultural crops. To fill this gap, the hypothesis that bee visitation to flowers decreases after pollination through reduced floral volatile emissions in highbush blueberries, Vaccinium corymbosum, was tested. Other sources of variation in floral emissions and the role of floral volatiles in bee attraction were also examined. METHODS Pollinator visitation to blueberry flowers was manipulated by bagging all flowers within a bush (pollinator excluded) or leaving them unbagged (open pollinated), and then the effect on floral volatile emissions and future bee visitation were measured. Floral volatiles were also measured from different blueberry cultivars, times of the day and flower parts, and a study was conducted to test the attraction of bees to floral volatiles. KEY RESULTS Open-pollinated blueberry flowers had 32 % lower volatile emissions than pollinator-excluded flowers. In particular, cinnamyl alcohol, a major component of the floral blend that is emitted exclusively from petals, was emitted in lower quantities from open-pollinated flowers. Although, no differences in cinnamyl alcohol emissions were detected among three blueberry cultivars or at different times of day, some components of the blueberry floral blend were emitted in higher amounts from certain cultivars and at mid-day. Field observations showed that more bees visited bushes with pollinator-excluded flowers. Also, more honey bees were caught in traps baited with a synthetic blueberry floral blend than in unbaited traps. CONCLUSIONS Greater volatile emissions may help guide bees to unpollinated flowers, and thus increase plant fitness and bee energetic return when foraging in blueberries. Furthermore, the variation in volatile emissions from blueberry flowers depending on pollination status, plant cultivar and time of day suggests an adaptive role of floral signals in increasing pollination of flowers.
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Affiliation(s)
- Cesar Rodriguez-Saona
- Department of Entomology, P.E. Marucci Center for Blueberry & Cranberry Research & Extension, Rutgers University, Chatsworth, NJ 08019, USA.
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Dannon EA, Tamò M, Van Huis A, Dicke M. Effects of volatiles from Maruca vitrata larvae and caterpillar-infested flowers of their host plant Vigna unguiculata on the foraging behavior of the parasitoid Apanteles taragamae. J Chem Ecol 2010; 36:1083-91. [PMID: 20842412 PMCID: PMC2952113 DOI: 10.1007/s10886-010-9859-2] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2010] [Revised: 08/09/2010] [Accepted: 09/03/2010] [Indexed: 11/26/2022]
Abstract
The parasitoid wasp Apanteles taragamae is a promising candidate for the biological control of the legume pod borer Maruca vitrata, which recently has been introduced into Benin. The effects of volatiles from cowpea and peabush flowers and Maruca vitrata larvae on host selection behavior of the parasitoid Apanteles taragamae were investigated under laboratory conditions by using a Y-tube olfactometer. Naïve and oviposition-experienced female wasps were given a choice between several odor sources that included (1) uninfested, (2) Maruca vitrata-infested, and (3) mechanically damaged cowpea flowers, as well as (4) stem portions of peabush plants carrying leaves and flowers, (5) healthy M. vitrata larvae, and moribund (6), and live (7) virus-infected M. vitrata larvae. Responses of naïve and oviposition-experienced female wasps did not differ for any of the odor source combinations. Wasps were significantly attracted to floral volatiles produced by cowpea flowers that had been infested with M. vitrata larvae and from which the larvae had been removed. Apanteles taragamae females also were attracted to Maruca vitrata-infested flowers after removal of both the larvae and their feces. Female wasps discriminated between volatiles from previously infested flowers and mechanically damaged flowers. Uninfested cowpea flowers attracted only oviposition-experienced wasps that had received a rewarding experience (i.e. the parasitization of two M. vitrata larvae feeding on cowpea flowers) before the olfactometer test. Wasps also were attracted to uninfested leaves and flowers of peabush. Moreover, they were also attracted to healthy and live virus-infected M. vitrata larvae, but not when the latter were moribund. Our data show that, similarly to what has been extensively been reported for foliar volatiles, flowers of plants also emit parasitoid-attracting volatiles in response to being infested with an herbivore.
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Affiliation(s)
- Elie A. Dannon
- Faculté des Sciences Agronomiques, Université d’Abomey-Calavi, 01 BP 526, Cotonou, Benin
| | - Manuele Tamò
- International Institute of Tropical Agriculture (IITA), Benin Station, 08 BP 0932 , Tri Postal, Cotonou, Benin
| | - Arnold Van Huis
- Laboratory of Entomology, Wageningen University, P.O. Box 8031, NL-6700EH Wageningen, The Netherlands
| | - Marcel Dicke
- Laboratory of Entomology, Wageningen University, P.O. Box 8031, NL-6700EH Wageningen, The Netherlands
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Dötterl S, Vereecken NJ. The chemical ecology and evolution of bee–flower interactions: a review and perspectivesThe present review is one in the special series of reviews on animal–plant interactions. CAN J ZOOL 2010. [DOI: 10.1139/z10-031] [Citation(s) in RCA: 170] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bees and angiosperms have shared a long and intertwined evolutionary history and their interactions have resulted in remarkable adaptations. Yet, at a time when the “pollination crisis” is of major concern as natural populations of both wild and honey bees ( Apis mellifera L., 1758) face alarming decline rates at a worldwide scale, there are important gaps in our understanding of the ecology and evolution of bee–flower interactions. In this review, we summarize and discuss the current knowledge about the role of floral chemistry versus other communication channels in bee-pollinated flowering plants, both at the macro- and micro-evolutionary levels, and across the specialization–generalization gradient. The available data illustrate that floral scents and floral chemistry have been largely overlooked in bee–flower interactions, and that pollination studies integrating these components along with pollinator behaviour in a phylogenetic context will help gain considerable insights into the sensory ecology and the evolution of bees and their associated flowering plants.
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Affiliation(s)
- S. Dötterl
- Department of Plant Systematics, University of Bayreuth, D-95440 Bayreuth, Germany
- Evolutionary Biology and Ecology, Free University of Brussels/Université Libre de Bruxelles, avenue FD Roosevelt 50 CP 160/12, B-1050 Brussels, Belgium
- Institute of Systematic Botany, University of Zürich, Zollikerstrasse 107, CH-8008 Zürich, Switzerland
| | - N. J. Vereecken
- Department of Plant Systematics, University of Bayreuth, D-95440 Bayreuth, Germany
- Evolutionary Biology and Ecology, Free University of Brussels/Université Libre de Bruxelles, avenue FD Roosevelt 50 CP 160/12, B-1050 Brussels, Belgium
- Institute of Systematic Botany, University of Zürich, Zollikerstrasse 107, CH-8008 Zürich, Switzerland
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Junker RR, Blüthgen N. Floral scents repel facultative flower visitors, but attract obligate ones. ANNALS OF BOTANY 2010; 105:777-82. [PMID: 20228087 PMCID: PMC2859918 DOI: 10.1093/aob/mcq045] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Revised: 01/28/2010] [Accepted: 02/09/2010] [Indexed: 05/18/2023]
Abstract
BACKGROUND AND AIMS Biological mutualisms rely on communication between partners, but also require protective measures against exploitation. Animal-pollinated flowers need to attract pollinators but also to avoid conflicts with antagonistic consumers. The view of flower visitors as mutualistic and antagonistic agents considers primarily the plants' interest. A classification emphasizing the consumer's point of view, however, may be more useful when considering animal's adaptations to flower visits which may include a tolerance against defensive floral scent compounds. METHODS In a meta-analysis covering 18 studies on the responses of animals to floral scents, the animals were assigned to the categories of obligate and facultative flower visitors which considers their dependency on floral resources. Their responses on floral scents were compared. KEY RESULTS On average, obligate flower visitors, often corresponding to pollinators, were attracted to floral scent compounds. In contrast, facultative and mainly antagonistic visitors were strongly repelled by floral scents. The findings confirm that floral scents have a dual function both as attractive and defensive cues. CONCLUSIONS Whether an animal depends on floral resources determines its response to these signals, suggesting that obligate flower visitors evolved a tolerance against primarily defensive compounds. Therefore, floral scent bouquets in conjunction with nutritious rewards may solve the conflicting tasks of attracting mutualists while repelling antagonists.
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Ibrahim MA, Egigu MC, Kasurinen A, Yahya A, Holopainen JK. Diversity of volatile organic compound emissions from flowering and vegetative branches of Yeheb,Cordeauxia edulis(Caesalpiniaceae), a threatened evergreen desert shrub. FLAVOUR FRAG J 2010. [DOI: 10.1002/ffj.1971] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kessler A, Halitschke R. Testing the potential for conflicting selection on floral chemical traits by pollinators and herbivores: predictions and case study. Funct Ecol 2009. [DOI: 10.1111/j.1365-2435.2009.01639.x] [Citation(s) in RCA: 183] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
The attack of a plant by herbivorous arthropods can result in considerable changes in the plant's chemical phenotype. The emission of so-called herbivore-induced plant volatiles (HIPV) results in the attraction of carnivorous enemies of the herbivores that induced these changes. HIPV induction has predominantly been investigated for interactions between one plant and one attacker. However, in nature plants are exposed to a variety of attackers, either simultaneously or sequentially, in shoots and roots, causing much more complex interactions than have usually been investigated in the context of HIPV. To develop an integrated view of how plants respond to their environment, we need to know more about the ways in which multiple attackers can enhance, attenuate, or otherwise alter HIPV responses. A multidisciplinary approach will allow us to investigate the underlying mechanisms of HIPV emission in terms of phytohormones, transcriptional responses and biosynthesis of metabolites in an effort to understand these complex plant-arthropod interactions.
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Theis N, Kesler K, Adler LS. Leaf herbivory increases floral fragrance in male but not female Cucurbita pepo subsp. texana (Cucurbitaceae) flowers. AMERICAN JOURNAL OF BOTANY 2009; 96:897-903. [PMID: 21628242 DOI: 10.3732/ajb.0800300] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Mutualisms are key interactions that affect population dynamics and structure communities, but the extent to which mutualists can attract potential partners may depend on community context. Many studies have shown that leaf herbivory reduces pollinator visitation and have focused on reduced floral visual display and rewards as potential mechanisms. However, olfactory display plays a critical role in mediating interactions between plants, herbivores, and pollinators. We simulated leaf damage in Cucurbita pepo subsp. texana and measured fragrance emission and other floral characters of both male and female flowers. Contrary to our expectations, damage increased fragrance production, but only in male flowers. Female flowers, which were bigger and produced more fragrance than males, were unaffected by leaf damage. The greatest increase in floral fragrance compounds was in the terpenoids, which we hypothesize could be byproducts of defensively induced cucurbitacins, or they may function defensively themselves. In summary, this study is the first to demonstrate changes in floral fragrance due to leaf damage. Such changes in floral fragrance following herbivory may be a critical and overlooked mechanism mediating interactions between plants, herbivores, and pollinators.
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Affiliation(s)
- Nina Theis
- Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, Massachusetts 01003 USA
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Kumano-Nomura Y, Yamaoka R. Beetle visitations, and associations with quantitative variation of attractants in floral odors of Homalomena propinqua (Araceae). JOURNAL OF PLANT RESEARCH 2009; 122:183-192. [PMID: 19110656 DOI: 10.1007/s10265-008-0204-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2008] [Accepted: 11/13/2008] [Indexed: 05/27/2023]
Abstract
This study investigated floral visitations of two beetles, Parastasia bimaculata (Scarabaeidae) and Chaloenus schawalleri (Chrysomelidae), and examined associations between beetle visitations and variation in attractant traits, such as quantitative variations of attractants in floral odors and heat generation of spadices in Homalomena propinqua (Araceae). Observations showed P. bimaculata visited pistillate-phase inflorescences most frequently during heat generation, whereas C. schawalleri visited regardless of floral stages and heat generation. Chemical analyses of five dominant components of floral odors showed quantities of 2-butanol, veratrole, and alpha-pinene during the pistillate phase were the most abundant during all floral stages, and increased during heat generation. When testing combinations of these five authentic chemicals, some mixtures including 2-butanol or veratrole or both attracted both beetles, and veratrole attracted C. schawalleri. These results strongly suggested that the increased emission of floral odor attractants which accompanied heat generation influences floral visitations by P. bimaculata, but not by C. schawalleri. We therefore hypothesize that P. bimaculataaculata is a reliable pollinator, and that variation in attractant traits is a honest signal for P. bimaculata to seek rewards. In contrast, C. schawalleri can detect the signal even at low levels, and so visits inflorescences steadily during all floral stages.
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Affiliation(s)
- Yuko Kumano-Nomura
- Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan.
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