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Chen F, Huang P, Wang J, Wu W, Lin YW, Hu JF, Liu XG. Specific volatiles of tea plants determine the host preference behavior of Empoasca onukii. FRONTIERS IN PLANT SCIENCE 2023; 14:1239237. [PMID: 37719207 PMCID: PMC10501839 DOI: 10.3389/fpls.2023.1239237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/07/2023] [Indexed: 09/19/2023]
Abstract
Empoasca onukii is a major pest that attacks tea plants. To seek effective and sustainable methods to control the pest, it is necessary to assess its host preference among different species of tea and understand the critical factors behind this behavior. In this study, the behavioral preference of E. onukii for volatile organic compounds (VOCs) of three potted tea species was evaluated. The VOCs released by the three tea species were analyzed using gas chromatography-mass spectrometry, and the major components were used to test the pest's preference. Transcriptome analysis was used to infer the key genes that affect the biosyntheses of the VOCs. The results showed that the tendency of E. onukii toward the VOCs of the three tea species was the strongest in green tea, followed by white tea, and the weakest in red tea. This behavioral preference was significantly and positively correlated with the relative levels of hexanol, linalool, and geraniol in tea volatiles. Relative hexanol was significantly and positively correlated with the expression of genes TEA009423 (LOX2.1), TEA009596 (LOX1.5), TEA008699 (HPL), TEA018669 (CYPADH), and TEA015686 (ADHIII). Relative linalool was significantly and positively correlated with the expression of genes TEA001435 (CAD) and Camellia_sinensis_newGene_22126 (TPS). Relative geraniol was significantly and positively correlated with the expression of genes TEA001435 (CAD), TEA002658 (CYP76B6), TEA025455 (CYP76T24), and Camellia_sinensis_newGene_22126 (TPS). The above findings suggested that three volatiles (hexanol, linalool, and geraniol) determined the behavioral preference of E. onukii toward tea plants, and their biosynthesis was mainly affected by nine genes (TEA009423, TEA009596, TEA008699, TEA018669, TEA015686, TEA001435, TEA002658, TEA025455, and Camellia_sinensis_newGene_22126).
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Affiliation(s)
- Feng Chen
- Institute of Plant Protection, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests/ Fujian Engineering Research Center for Green Pest Management, Fuzhou, China
| | - Peng Huang
- Institute of Plant Protection, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests/ Fujian Engineering Research Center for Green Pest Management, Fuzhou, China
| | - Jun Wang
- Institute of Plant Protection, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests/ Fujian Engineering Research Center for Green Pest Management, Fuzhou, China
| | - Wei Wu
- Institute of Plant Protection, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests/ Fujian Engineering Research Center for Green Pest Management, Fuzhou, China
| | - Yong-Wen Lin
- College of Food Engineering, Zhangzhou Institute of Technology, Zhangzhou Institute of Technology, Zhangzhou, China
| | - Jin-Feng Hu
- Institute of Plant Protection, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests/ Fujian Engineering Research Center for Green Pest Management, Fuzhou, China
| | - Xin-Gang Liu
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
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Guruswamy M, Marimuthu M, Coll M. Negative Effects of Phthorimaea absoluta-Resistant Tomato Genotypes on the Zoophytophagous Biocontrol Agent, Orius laevigatus (Fieber) (Hemiptera: Anthocoridae). INSECTS 2023; 14:160. [PMID: 36835729 PMCID: PMC9965615 DOI: 10.3390/insects14020160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/03/2023] [Accepted: 02/03/2023] [Indexed: 06/18/2023]
Abstract
Complex interactions between host plant resistance (HPR) and biological control agents, particularly omnivorous predators, can shape the outcome of an integrated pest management (IPM) program. However, such interactions are seldom explored during plant breeding programs. Therefore, in the present study, we compared the performance of the omnivorous biological control agent Orius laevigatus on six tomato genotypes with different levels of resistance to the tomato leaf miner Phthorimaea absoluta. We found that the O. laevigatus fitness components (i.e., egg deposition, egg hatching rate, and duration of egg, early nymphal, late nymphal stages, and their survival) were inferior on the wild resistant genotypes (LA 716 and LA 1777) in comparison to the resistant domesticated genotype EC 620343 and the susceptible genotypes (EC 705464 and EC 519819). It appears that the adverse effects of tomato genotypes on O. laevigatus are determined mainly by glandular and non-glandular trichome densities on the leaves. Comparison of O. laevigatus response to the tested tomato cultivars to that of P. absoluta revealed significant positive correlations in duration of the egg stages, development time of early and late larval stages, and overall immature mortality in both species. It appears, therefore, that defensive plant traits operate in a similar way on the pest and its predator in the system. Overall, the present study of the tomato-P. absoluta-O. laevigatus system provides experimental evidence for the need to optimize pest management by employing intermediate levels of crop resistance together with biological control agents.
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Affiliation(s)
- Megha Guruswamy
- Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, India
- Department of Entomology, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Murugan Marimuthu
- Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, India
| | - Moshe Coll
- Department of Entomology, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
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Foba CN, Shi JH, An QQ, Liu L, Hu XJ, Hegab MAMS, Liu H, Zhao PM, Wang MQ. Volatile-mediated tritrophic defense and priming in neighboring maize against Ostrinia furnacalis and Mythimna separata. PEST MANAGEMENT SCIENCE 2023; 79:105-113. [PMID: 36088646 DOI: 10.1002/ps.7178] [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: 04/27/2022] [Revised: 08/19/2022] [Accepted: 09/11/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Plants respond to attackers by triggering phytohormones signaling associated metabolites, including herbivore-induced plant volatiles (HIPVs). HIPVs can indirectly act against herbivory by recruitment of natural enemies and priming of neighboring plants. Ostrinia furnacalis and Mythimna separata are important insect herbivores of maize plants that have a devastating influence on yield. However, little is known about how maize temporally reconfigures its defense systems against these herbivores and variation of neighboring plant resistance. RESULTS This study investigated the effects of HIPVs on the behavior of the dominant predatory beetle Harmonia axyridis and priming in neighboring maize defense against O. furnacalis and M. separata over time. The results showed that maize damaged by either O. furnacalis or M. separata enhanced the release of volatiles including terpenes, aldehydes, alkanes and an ester, which elicited an increased attractive response to H. axyridis after 3 and 12 h, respectively. O. furnacalis damage resulted in accumulations of leaf jasmonic acid (JA) and salicylic acid in maize after 6 and 3 h, respectively, while M. separata damage only raised the JA level after 3 h. Furthermore, HIPVs were able to prime neighboring plants through the accumulation of JA after 24 h. Both larvae showed a significant decrease in weight accumulation after 48 h of feeding on the third leaves of the primed plant. CONCLUSION Taken together, the findings provide a dynamic overview of how attacked maize reconfigures its volatiles and phytohormones to defend against herbivores, as well as priming of neighboring plants against oncoming attacks. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Caroline Ngichop Foba
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
- Lincoln University, College of Agriculture, Environmental and Human Sciences, Cooperative Extension, 65101, Jefferson City, MO, USA
| | - Jin-Hua Shi
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
| | - Qing-Qing An
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
| | - Le Liu
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
| | - Xin-Jun Hu
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
| | - Mahmoud Ali Morse Soliman Hegab
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
- Department of Entomology, Faculty of Agriculture, Damietta University, Damietta, Damietta El-Gadeeda City, Kafr Saad, Damietta Governorate, 34511, Egypt
| | - Hao Liu
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
| | - Pei-Min Zhao
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
| | - Man-Qun Wang
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China
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Gu D, Wu S, Yu Z, Zeng L, Qian J, Zhou X, Yang Z. Involvement of histone deacetylase CsHDA2 in regulating ( E)-nerolidol formation in tea ( Camellia sinensis) exposed to tea green leafhopper infestation. HORTICULTURE RESEARCH 2022; 9:uhac158. [PMID: 36324644 PMCID: PMC9613726 DOI: 10.1093/hr/uhac158] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Accepted: 07/06/2022] [Indexed: 06/16/2023]
Abstract
Herbivore-induced plant volatiles (HIPVs) help the tea plant (Camellia sinensis) adapt to environmental stress, and they are also quality-related components of tea. However, the upstream mechanism regulating the herbivore-induced expression of volatile biosynthesis genes is unclear, especially at the level of epigenetic regulation. In this study, similar to the effects of a tea green leafhopper infestation, treatments with exogenous jasmonic acid (JA) and histone deacetylase inhibitors significantly increased the (E)-nerolidol content in tea and induced the expression of the associated biosynthesis gene CsNES. Furthermore, a key transcription factor related to JA signaling, myelocytomatosis 2 (CsMYC2), interacted with histone deacetylase 2 (CsHDA2) in vitro and in vivo. A tea green leafhopper infestation inhibited CsHDA2 expression and decreased CsHDA2 abundance. Moreover, the tea green leafhopper infestation increased H3 and H4 acetylation levels in the promoter region of CsNES, which in turn upregulated the expression of CsNES and increased the (E)-nerolidol content. In this study, we revealed the effects of histone acetylations on the accumulation of HIPVs, while also confirming that CsHDA2-CsMYC2 is an important transcriptional regulatory module for the accumulation of (E)-nerolidol induced by tea green leafhoppers. The results of this study may be useful for characterizing plant aromatic compounds and the main upstream stress-responsive signaling molecules. Furthermore, the study findings will assist researchers clarify the epigenetic regulation influencing plant secondary metabolism in response to external stress.
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Affiliation(s)
| | | | | | - Lanting Zeng
- Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, No. 723 Xingke Road, Tianhe District, Guangzhou 510650, China
| | - Jiajia Qian
- Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, No. 723 Xingke Road, Tianhe District, Guangzhou 510650, China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
| | - Xiaochen Zhou
- Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, No. 723 Xingke Road, Tianhe District, Guangzhou 510650, China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
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5
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Resistance Management through Brassica Crop–TuMV–Aphid Interactions: Retrospect and Prospects. HORTICULTURAE 2022. [DOI: 10.3390/horticulturae8030247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Turnip mosaic virus (TuMV) is an important threat to the yield and quality of brassica crops in China, and has brought serious losses to brassica crops in the Far East, including China and the north. Aphids (Hemiptera, Aphidoidea) are the main mediators of TuMV transmission in field production, and not only have strong virus transmission ability (small individuals, strong concealment, and strong fecundity), but are also influenced by the environment, making them difficult to control. Till now, there have been few studies on the resistance to aphids in brassica crops, which depended mainly on pesticide control in agriculture production. However, the control effect was temporarily effective, which also brought environmental pollution, pesticide residues in food products, and destroyed the ecological balance. This study reviews the relationship among brassica crop–TuMV, TuMV–aphid, and brassica crop–aphid interactions, and reveals the influence factors (light, temperature, and CO2 concentration) on brassica crop–TuMV–aphid interactions, summarizing the current research status and main scientific problems about brassica crop–TuMV–aphid interactions. It may provide theoretical guidance for opening up new ways of aphid and TuMV management in brassica crops.
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Integrated Volatile Metabolomics and Transcriptomics Analyses Reveal the Influence of Infection TuMV to Volatile Organic Compounds in Brassica rapa. HORTICULTURAE 2022. [DOI: 10.3390/horticulturae8010057] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Turnip mosaic virus (TuMV), which is distributed almost all over the world and has a wide range of hosts, mainly brassica crops, was first described in Brassica rapa in the USA. Plant volatile compounds play an important role in the host searching behavior of natural enemies of herbivorous insects. In this study, TuMV-inoculated resistant and susceptible B. rapa lines were tested using volatile metabolome and transcriptome analyses. In volatile metabolome analysis, the volatile organic compounds (VOCs) were different after inoculation with TuMV in resistant B80124 and susceptible B80461, and the degree of downregulation of differentially expressed metabolites was more obvious than the degree of upregulation. Through transcriptome analysis, 70% of differentially expressed genes were in biological process, especially focusing on defense response, flavonoid biosynthetic process, and toxin metabolic process, which indicates that TuMV stress maybe accelerate the increase of VOCs. Integrating the metabolome and transcriptome analyses, after inoculating with TuMV, auxin regulation was upregulated, and ARF, IAA and GH3 were also upregulated, which accelerated cell enlargement and plant growth in tryptophan metabolism. The different genes in zeatin biosynthesis pathways were downregulated, which reduced cell division and shoot initiation. However, the metabolite pathways showed upregulation in brassinosteroid biosynthesis and α-linolenic acid metabolism, which could cause cell enlargement and a stress response. This study determined the difference in volatiles between normal plants and infected plants and may lay a foundation for anti-TuMV research in B. rapa.
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Thöming G. Behavior Matters-Future Need for Insect Studies on Odor-Mediated Host Plant Recognition with the Aim of Making Use of Allelochemicals for Plant Protection. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:10469-10479. [PMID: 34482687 DOI: 10.1021/acs.jafc.1c03593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Allelochemicals, chemical cues that, among other things, mediate insect-plant interactions, such as host plant recognition, have attracted notable interest as tools for ecological control of pest insects. Advances have recently been made in methods for sampling and analyzing volatile compounds and technology for tracking insects in their natural habitat. However, progress in odor-mediated behavioral bioassays of insects has been relatively slow. This perspective highlights this odor-mediated insect behavior, particularly in a natural setting and considering the whole behavioral sequence involved in the host location, which is the key to understanding the mechanisms underlying host plant recognition. There is thus a need to focus on elaborate behavioral bioassays in future studies, particularly if the goal is to use allelochemicals in pest control. Future directions for research are discussed.
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Affiliation(s)
- Gunda Thöming
- Division of Biotechnology and Plant Health, Norwegian Institute of Bioeconomy Research, Høgskoleveien 7, NO-1433 Ås, Norway
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Ayelo PM, Pirk CWW, Yusuf AA, Chailleux A, Mohamed SA, Deletre E. Exploring the Kairomone-Based Foraging Behaviour of Natural Enemies to Enhance Biological Control: A Review. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.641974] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Kairomones are chemical signals that mediate interspecific interactions beneficial to organisms that detect the cues. These attractants can be individual compounds or mixtures of herbivore-induced plant volatiles (HIPVs) or herbivore chemicals such as pheromones, i.e., chemicals mediating intraspecific communication between herbivores. Natural enemies eavesdrop on kairomones during their foraging behaviour, i.e., location of oviposition sites and feeding resources in nature. Kairomone mixtures are likely to elicit stronger olfactory responses in natural enemies than single kairomones. Kairomone-based lures are used to enhance biological control strategies via the attraction and retention of natural enemies to reduce insect pest populations and crop damage in an environmentally friendly way. In this review, we focus on ways to improve the efficiency of kairomone use in crop fields. First, we highlight kairomone sources in tri-trophic systems and discuss how these attractants are used by natural enemies searching for hosts or prey. Then we summarise examples of field application of kairomones (pheromones vs. HIPVs) in recruiting natural enemies. We highlight the need for future field studies to focus on the application of kairomone blends rather than single kairomones which currently dominate the literature on field attractants for natural enemies. We further discuss ways for improving kairomone use through attract and reward technique, olfactory associative learning, and optimisation of kairomone lure formulations. Finally, we discuss why the effectiveness of kairomone use for enhancing biological control strategies should move from demonstration of increase in the number of attracted natural enemies, to reducing pest populations and crop damage below economic threshold levels and increasing crop yield.
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Electrophysiological and Behavioral Responses of an Ambrosia Beetle to Volatiles of its Nutritional Fungal Symbiont. J Chem Ecol 2021; 47:463-475. [PMID: 33761047 PMCID: PMC8116273 DOI: 10.1007/s10886-021-01263-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 02/23/2021] [Accepted: 03/02/2021] [Indexed: 11/03/2022]
Abstract
Ambrosia beetles (Coleoptera: Scolytinae) cultivate their fungal symbiont within host substrates as the sole source of nutrition on which the larvae and adults must feed. To investigate a possible role for semiochemicals in this interaction, we characterized electrophysiological and behavioral responses of Xylosandrus germanus to volatiles associated with its fungal symbiont Ambrosiella grosmanniae. During still-air walking bioassays, X. germanus exhibited an arrestment response to volatiles of A. grosmanniae, but not antagonistic fungi Beauveria bassiana, Metarhizium brunneum, Trichoderma harzianum, the plant pathogen Fusarium proliferatum, or malt extract agar. Solid phase microextraction-gas chromatography-mass spectrometry identified 2-ethyl-1-hexanol, 2-phenylethanol, methyl benzoate and 3-methyl-1-butanol in emissions from A. grosmanniae; the latter two compounds were also detected in emissions from B. bassiana. Concentration-responses using electroantennography documented weak depolarizations to A. grosmanniae fungal volatiles, unlike the comparatively strong response to ethanol. When tested singly in walking bioassays, volatiles identified from A. grosmanniae elicited relatively weak arrestment responses, unlike the responses to ethanol. Xylosandrus germanus also exhibited weak or no long-range attraction to the fungal volatiles when tested singly during field trials in 2016-2018. None of the fungal volatiles enhanced attraction of X. germanus to ethanol when tested singly; in contrast, 2-phenylethanol and 3-methyl-1-butanol consistently reduced attraction to ethanol. Volatiles emitted by A. grosmanniae may represent short-range olfactory cues that could aid in distinguishing their nutritional fungal symbiont from other fungi, but these compounds are not likely to be useful as long-range attractants for improving detection or mass trapping tactics.
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Alınç T, Cusumano A, Peri E, Torta L, Colazza S. Trichoderma harzianum Strain T22 Modulates Direct Defense of Tomato Plants in Response to Nezara viridula Feeding Activity. J Chem Ecol 2021; 47:455-462. [PMID: 33713251 PMCID: PMC8116274 DOI: 10.1007/s10886-021-01260-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 02/20/2021] [Accepted: 03/01/2021] [Indexed: 12/31/2022]
Abstract
Plant growth-promoting fungi belonging to genus Trichoderma are known to help plants when dealing with biotic stressors by enhancing plant defenses. While beneficial effects of Trichoderma spp. against plant pathogens have long been documented, fewer studies have investigated their effect on insect pests. Here, we studied the impact of Trichoderma root colonization on the plant defense responses against stink bug feeding attack. For this purpose, a model system consisting of tomato plant, Solanum lycopersicum cv Dwarf San Marzano, Trichoderma harzianum strain T22 and the southern green stink bug, Nezara viridula, was used. We firstly determined stink bug performance in terms of relative growth rate and survival on tomato plants inoculated by T. harzianum T22. Then, we evaluated relative expression of plant defense-related genes on inoculated plants induced by stink bug feeding. We found evidence that T. harzianum T22 affects tomato defense responses against N. viridula nymphs leading to reduction of growth rate. Our results also showed that T. harzianum T22 enhances plant direct defenses by an early increase of transcript levels of jasmonic acid marker genes. Yet this effect was time-dependent and only detected 8 h after herbivore induction. Taken together, our findings provide better understanding on the mechanisms underlying tomato induced resistance against herbivorous stink bugs.
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Affiliation(s)
- Tuğcan Alınç
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bld. 5, 90128, Palermo, Italy
| | - Antonino Cusumano
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bld. 5, 90128, Palermo, Italy.
| | - Ezio Peri
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bld. 5, 90128, Palermo, Italy
| | - Livio Torta
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bld. 5, 90128, Palermo, Italy
| | - Stefano Colazza
- Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Bld. 5, 90128, Palermo, Italy
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Chen Y, Shukurova MK, Asikin Y, Kusano M, Watanabe KN. Characterization of Volatile Organic Compounds in Mango Ginger ( Curcuma amada Roxb.) from Myanmar. Metabolites 2020; 11:21. [PMID: 33396947 PMCID: PMC7824228 DOI: 10.3390/metabo11010021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/28/2020] [Accepted: 12/28/2020] [Indexed: 11/30/2022] Open
Abstract
Curcuma amada Roxb. (Zingiberaceae), commonly known as mango ginger because its rhizome and foliar parts have a similar aroma to mango. The rhizome has been widely used in food industries and alternative medicines to treat a variety of internal diseases such as cough, bronchitis, indigestion, colic, loss of appetite, hiccups, and constipation. The composition of the volatile constituents in a fresh rhizome of C. amada is not reported in detail. The present study aimed to screen and characterize the composition of volatile organic compound (VOC) in a fresh rhizome of three C. amada (ZO45, ZO89, and ZO114) and one C. longa (ZO138) accessions originated from Myanmar. The analysis was carried out by means of headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-time-of-flight-mass spectrometry (GC-TOF-MS). As a result, 122 VOCs were tentatively identified from the extracted 373 mass spectra. The following compounds were the ten most highly abundant and broadly present ones: ar-turmerone, α-zingiberene, α-santalene, (E)-γ-atlantone, cuparene, β-bisabolene, teresantalol, β-sesquiphellandrene, trans-α-bergamotene, γ-curcumene. The intensity of ar-turmerone, the sesquiterpene which is mainly characterized in C. longa essential oil (up to 15.5-27.5%), was significantly higher in C. amada accession ZO89 (15.707 ± 5.78a) compared to C. longa accession ZO138 (0.300 ± 0.08b). Cis-α-bergamotene was not detected in two C. amada accessions ZO45 and ZO89. The study revealed between-species variation regarding identified VOCs in the fresh rhizome of C. amada and C. longa.
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Affiliation(s)
- Yanhang Chen
- Graduate School of Life and Environmental Science, University of Tsukuba, Ibaraki 305-8572, Japan; (Y.C.); (M.K.S.)
| | - Musavvara Kh. Shukurova
- Graduate School of Life and Environmental Science, University of Tsukuba, Ibaraki 305-8572, Japan; (Y.C.); (M.K.S.)
| | - Yonathan Asikin
- Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus, Okinawa 903-0213, Japan;
| | - Miyako Kusano
- Faculty of Life and Environmental Science, University of Tsukuba, Ibaraki 305-8572, Japan;
- Tsukuba-Plant Innovation Research Center, University of Tsukuba, Ibaraki 305-8572, Japan
| | - Kazuo N. Watanabe
- Faculty of Life and Environmental Science, University of Tsukuba, Ibaraki 305-8572, Japan;
- Tsukuba-Plant Innovation Research Center, University of Tsukuba, Ibaraki 305-8572, Japan
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12
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Cagliero C, Mastellone G, Marengo A, Bicchi C, Sgorbini B, Rubiolo P. Analytical strategies for in-vivo evaluation of plant volatile emissions - A review. Anal Chim Acta 2020; 1147:240-258. [PMID: 33485582 DOI: 10.1016/j.aca.2020.11.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 11/20/2020] [Accepted: 11/22/2020] [Indexed: 12/14/2022]
Abstract
Biogenic volatile organic compounds (BVOCs) are metabolites emitted by living plants that have a fundamental ecological role since they influence atmospheric chemistry, plant communication and pollinator/herbivore behaviour, and human activities. Over the years, several strategies have been developed to isolate and identify them, and to take advantage of their activity. The main techniques used for in-vivo analyses include dynamic headspace (D-HS), static headspace (S-HS) and, more recently, direct contact (DC) methods in association with gas chromatography (GC) and mass spectrometry (MS). The aim of this review is to provide insight into the in-vivo characterisation of plant volatile emissions with a focus on sampling, analysis and possible applications. This review first provides a critical discussion of the challenges associated with conventional approaches and their limitations and advantages. Then, it describes a series of applications of in-vivo volatilomic studies to enhance how the information they provide impact on our knowledge of plant behaviour, including the effects of abiotic (damage, flooding, climate) and biotic (insect feeding) stress factors in relation to the plants.
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Affiliation(s)
- Cecilia Cagliero
- Dipartimento di Scienza e Tecnologia Del Farmaco, Università Degli Studi di Torino, I, 10125, Turin, Italy.
| | - Giulia Mastellone
- Dipartimento di Scienza e Tecnologia Del Farmaco, Università Degli Studi di Torino, I, 10125, Turin, Italy
| | - Arianna Marengo
- Dipartimento di Scienza e Tecnologia Del Farmaco, Università Degli Studi di Torino, I, 10125, Turin, Italy
| | - Carlo Bicchi
- Dipartimento di Scienza e Tecnologia Del Farmaco, Università Degli Studi di Torino, I, 10125, Turin, Italy
| | - Barbara Sgorbini
- Dipartimento di Scienza e Tecnologia Del Farmaco, Università Degli Studi di Torino, I, 10125, Turin, Italy
| | - Patrizia Rubiolo
- Dipartimento di Scienza e Tecnologia Del Farmaco, Università Degli Studi di Torino, I, 10125, Turin, Italy
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13
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Stierlin É, Michel T, Fernandez X. Field analyses of lavender volatile organic compounds: performance evaluation of a portable gas chromatography-mass spectrometry device. PHYTOCHEMICAL ANALYSIS : PCA 2020; 31:778-785. [PMID: 32337802 DOI: 10.1002/pca.2942] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 03/30/2020] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION In situ analysis of volatile organic compounds (VOCs) emitted by plants is an important challenge in chemical ecology. The traditional approach usually consists in trapping compounds using dynamic headspace extraction (DHS) in-field, followed by gas chromatography analysis coupled with mass spectrometry (GC-MS and/or GC-FID) in the laboratory. OBJECTIVES In this study, we evaluated the use of the new portable Torion T-9 GC-MS system for rapid and in situ analysis of VOCs emitted by fine lavender and lavandin species. MATERIAL AND METHODS All field analyses were performed using a person-portable low-thermal mass GC system coupled with a miniature toroidal ion trap mass analyser (ppGC-ITMS): Torion T-9 portable GC-MS. Subsequently, multivariate statistical analyses were performed to determine chemical differences between species. RESULTS Thirty compounds were separated and detected in all lavender above-ground samples in only 3 min of analysis. CONCLUSIONS The portable GC-MS device enabled a rapid in-field distinction of Lavandula species based on their detected volatile profiles.
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Affiliation(s)
- Émilie Stierlin
- Université Côte d'Azur, CNRS, Institut de Chimie de Nice UMR 7272, Nice, France
| | - Thomas Michel
- Université Côte d'Azur, CNRS, Institut de Chimie de Nice UMR 7272, Nice, France
| | - Xavier Fernandez
- Université Côte d'Azur, CNRS, Institut de Chimie de Nice UMR 7272, Nice, France
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14
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Mäntylä E, Kipper S, Hilker M. Insectivorous birds can see and smell systemically herbivore-induced pines. Ecol Evol 2020; 10:9358-9370. [PMID: 32953066 PMCID: PMC7487227 DOI: 10.1002/ece3.6622] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/25/2020] [Accepted: 07/08/2020] [Indexed: 11/10/2022] Open
Abstract
Several studies have shown that insectivorous birds are attracted to herbivore-damaged trees even when they cannot see or smell the actual herbivores or their feces. However, it often remained an open question whether birds are attracted by herbivore-induced changes in leaf odor or in leaf light reflectance or by both types of changes. Our study addressed this question by investigating the response of great tits (Parus major) and blue tits (Cyanistes caeruleus) to Scots pine (Pinus sylvestris) damaged by pine sawfly larvae (Diprion pini). We released the birds individually to a study booth, where they were simultaneously offered a systemically herbivore-induced and a noninfested control pine branch. In the first experiment, the birds could see the branches, but could not smell them, because each branch was kept inside a transparent, airtight cylinder. In the second experiment, the birds could smell the branches, but could not see them, because each branch was placed inside a nontransparent cylinder with a mesh lid. The results show that the birds were more attracted to the herbivore-induced branch in both experiments. Hence, either type of the tested cues, the herbivore-induced visual plant cue alone as well as the olfactory cues per se, is attractive to the birds.
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Affiliation(s)
- Elina Mäntylä
- Applied Zoology/Animal EcologyInstitute of BiologyFreie Universität BerlinBerlinGermany
- Institute of EntomologyBiology Centre of the Czech Academy of SciencesČeské BudĕjoviceCzech Republic
- Faculty of ScienceUniversity of South BohemiaČeské BudĕjoviceCzech Republic
- Section of EcologyDepartment of BiologyUniversity of TurkuTurkuFinland
| | - Silke Kipper
- Animal BehaviourInstitute of BiologyFreie Universität BerlinBerlinGermany
- Technische Universität MünchenFreisingGermany
| | - Monika Hilker
- Applied Zoology/Animal EcologyInstitute of BiologyFreie Universität BerlinBerlinGermany
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15
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A non-invasive soil-based setup to study tomato root volatiles released by healthy and infected roots. Sci Rep 2020; 10:12704. [PMID: 32728091 PMCID: PMC7391657 DOI: 10.1038/s41598-020-69468-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 06/24/2020] [Indexed: 01/14/2023] Open
Abstract
The role of root exudates in mediating plant–microbe interactions has been well documented. However, the function of volatile organic compounds (VOCs) emitted by plant roots has only recently begun to attract attention. This newly recognized relevance of belowground VOCs has so far mostly been tested using systems limited to a two-compartment Petri-dish design. Furthermore, many of the plant–microbe interaction studies have only investigated the effects of microbial VOCs on plant growth. Here, we go two steps further. First we investigated the volatile profile of healthy and pathogen (Fusarium oxysporum) infected tomato roots grown in soil. We then used a unique soil-based olfactometer-choice assay to compare the migration pattern of four beneficial bacteria (Bacillus spp.) towards the roots of the tomato plants. We demonstrate that the blend of root-emitted VOCs differs between healthy and diseased plants. Our results show that VOCs are involved in attracting bacteria to plant roots.
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16
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Shukurova MK, Asikin Y, Chen Y, Kusano M, Watanabe KN. Profiling of Volatile Organic Compounds in Wild Indigenous Medicinal Ginger ( Zingiber barbatum Wall.) from Myanmar. Metabolites 2020; 10:E248. [PMID: 32549365 PMCID: PMC7344531 DOI: 10.3390/metabo10060248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 06/08/2020] [Accepted: 06/08/2020] [Indexed: 11/17/2022] Open
Abstract
The emissions of volatile organic compounds (VOCs) strongly depend on the plant species and are differently represented in specific taxa. VOCs have a degree of chemical diversity and also can serve as chemotaxonomic markers. Zingiber barbatum Wall. is a wild medicinal ginger plant endemic to Myanmar whose VOC composition has never been screened before. In this study, we screened the rhizome of Z. barbatum to identify the VOC composition by the application of gas chromatography combined with time-of-flight-mass spectrometry (GC-TOF-MS). The resulting VOC profile of Z. barbatum showed that it consists mainly of monoterpenes (21%) and sesquiterpenes (30%). Intraspecific similarities and dissimilarities were found to exist between Z. barbatum genotypes in terms of VOC composition. Four accessions (ZO191, ZO223, ZO217, and the control accession ZO105) collected from the Shan State and Mandalay region of Myanmar were found to share a similar VOC profile, while two accessions (ZO64 and ZO160) collected from the Bago region were found to vary in their VOC profiles compared with the control accession. The two identified compounds, i.e., α-bergamotene and β-(E)-guaiene may serve as discriminative chemical markers for the characterization of Z. barbatum species collected in these three geographical regions of Myanmar. This study represents a first attempt to identify and describe the VOCs in the medicinal species Z. barbatum that have not been reported to date.
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Affiliation(s)
- Musavvara Kh. Shukurova
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan;
| | - Yonathan Asikin
- Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus, Okinawa 903-0213, Japan;
| | - Yanhang Chen
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan;
| | - Miyako Kusano
- Faculty of Life and Environmental Science, University of Tsukuba, Ibaraki 305-8572, Japan; (M.K.); (K.N.W.)
- Tsukuba-Plant Innovation Research Center, University of Tsukuba, Ibaraki 305-8572, Japan
- RIKEN Center for Sustainable Resource Science, Kanagawa 230-0045, Japan
| | - Kazuo N. Watanabe
- Faculty of Life and Environmental Science, University of Tsukuba, Ibaraki 305-8572, Japan; (M.K.); (K.N.W.)
- Tsukuba-Plant Innovation Research Center, University of Tsukuba, Ibaraki 305-8572, Japan
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17
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Hussain A, Rodriguez-Ramos JC, Erbilgin N. Spatial characteristics of volatile communication in lodgepole pine trees: Evidence of kin recognition and intra-species support. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 692:127-135. [PMID: 31344566 DOI: 10.1016/j.scitotenv.2019.07.211] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Revised: 07/10/2019] [Accepted: 07/14/2019] [Indexed: 06/10/2023]
Abstract
Plant interactions using volatile organic compounds, particularly in the context of kin recognition have received considerable attention in recent years, but several discrepancies and conflicting results have restricted our understanding. We propose that some of these discrepancies in literature are in part due to integral spatial characteristics of sites, and plant attributes. Chemotypic plasticity is commonly used to characterize kin, particularly in conifers. We studied constitutive and induced monoterpene chemotypes of non-attacked lodgepole pine trees within 30 m radii of pine trees attacked by mountain pine beetle. We tested the effects of volatile compounds emitted from the attacked trees on the non-attacked trees by challenge inoculations with a mountain pine beetle associated fungus. We found no relationship between constitutive monoterpene concentrations of the non-attacked trees and distance or direction from the attacked trees or site aspects. In contrast, the effects of volatile compounds were evident after inoculations, depending on distance from the attacked trees and site aspects. However, these interactions only emerged among chemotypically related trees. These results suggest that plants discriminate between chemical cues from kin and strangers, and the emitters likely aid only chemotypically related plants by emitting specific blends of volatiles that can only be deciphered by the receiving kin. These results further demonstrate the importance of incorporating spatial characteristics of sites and plant attributes in studies aimed at investigating intra-species interactions using volatile organic compounds.
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Affiliation(s)
- Altaf Hussain
- Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G 2E3, Canada.
| | - Jean C Rodriguez-Ramos
- Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G 2E3, Canada.
| | - Nadir Erbilgin
- Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G 2E3, Canada.
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18
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Xu H, Wang X, Chi G, Tan B, Wang J. Effects of Bacillus thuringiensis Genetic Engineering on Induced Volatile Organic Compounds Emission in Maize and the Attractiveness to a Parasitic Wasp. Front Bioeng Biotechnol 2019; 7:160. [PMID: 31355192 PMCID: PMC6635655 DOI: 10.3389/fbioe.2019.00160] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 06/20/2019] [Indexed: 11/13/2022] Open
Abstract
In order to control lepidopteran and coleopteran insects, the genes expressing Bacillus thuringiensis (Bt) insecticidal proteins have been transferred into crops. Ecological risk assessments of the transgenic plants have included impacts on non-target entomophagous insects, such as parasitoid wasps. Herbivore-induced plant volatiles are considered to be important defensive traits of plants because these compounds play as an important role in recruitment of natural enemies. Here, we evaluated induced volatile emissions of maize seedlings of two Bt cultivars (5422Bt1, event Bt11 and 5422CBCL, event Mon810), and their nearly isogenic non-Bt line 5422. We damaged plants mechanically and then applied with the regurgitant of Spodoptera litura (F.) caterpillars (Lepidoptera: Noctuidae), or treated the plants with the plant hormone jasmonic acid (JA), to trigger similar defensive responses of plants. Compared to the non-Bt isoline 5422 and the Bt maize 5422CBCL, the other Bt maize 5422Bt1 released more (3E)-4,8-dimethyl-1,3,7-nonatriene (DMNT) when they were all treated by artificial wounds and caterpillar regurgitant; and released more linalool, DMNT and (E)-β-farnesene when applied with JA solution. As a result, the total volatile emission of the 5422Bt1 was highest. However, the difference in volatile emission did not affect the attractiveness of the Bt maize plants to the egg parasitoid Trichogramma ostriniae Pang et Chen (Hymenoptera: Trichogrammatidae) compared to the nearly isogenic non-Bt plants. The variability of induced volatiles of maize cultivars derived from conventional breeding programs and transgenic methods are discussed.
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Affiliation(s)
- Hao Xu
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou, China.,Institute of Tropical and Subtropical Ecology, South China Agricultural University, Guangzhou, China.,School of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Xiaoyi Wang
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou, China
| | - Guoliang Chi
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou, China.,Institute of Tropical and Subtropical Ecology, South China Agricultural University, Guangzhou, China
| | - Bingchang Tan
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou, China.,Institute of Tropical and Subtropical Ecology, South China Agricultural University, Guangzhou, China
| | - Jianwu Wang
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou, China.,Institute of Tropical and Subtropical Ecology, South China Agricultural University, Guangzhou, China
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19
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Sharma R, Zhou M, Hunter MD, Fan X. Rapid In Situ Analysis of Plant Emission for Disease Diagnosis Using a Portable Gas Chromatography Device. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:7530-7537. [PMID: 31184878 DOI: 10.1021/acs.jafc.9b02500] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We developed and applied a fully automated portable gas chromatography (GC) device for rapid and in situ analysis of plant volatile organic compounds (VOCs) to examine plant health status. A total of 42 emission samples were collected over a period of 5 days from 10 milkweed ( Asclepias syriaca) plants, half of which were infested by aphids. Thirty-five VOC peaks were separated and detected in 8 min. An algorithm based on machine learning, principal component analysis, and linear discriminant analysis was developed to evaluate the GC results. We found that our device and algorithm are able to distinguish between the undamaged control and the aphid-infested milkweeds with an overall accuracy of 90-100% within 48-72 h of the attack. Such rapid in situ detection of insect attack attests to the great potential of VOC monitoring in plant health management.
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Affiliation(s)
- Ruchi Sharma
- Department of Biomedical Engineering , University of Michigan 1101 Beal Avenue , Ann Arbor , Michigan 48109 , United States
| | - Menglian Zhou
- Department of Biomedical Engineering , University of Michigan 1101 Beal Avenue , Ann Arbor , Michigan 48109 , United States
| | - Mark D Hunter
- Department of Ecology and Evolutionary Biology , University of Michigan , 3010 Biological Sciences Building , Ann Arbor , Michigan 48109 , United States
| | - Xudong Fan
- Department of Biomedical Engineering , University of Michigan 1101 Beal Avenue , Ann Arbor , Michigan 48109 , United States
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20
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Herbivore-Induced Volatiles from Maize Plants Attract Chelonus insularis, an Egg-Larval Parasitoid of the Fall Armyworm. J Chem Ecol 2019; 45:326-337. [PMID: 30746603 DOI: 10.1007/s10886-019-01051-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 01/18/2019] [Accepted: 01/28/2019] [Indexed: 10/27/2022]
Abstract
Chelonus insularis (Hymenoptera: Braconidae) is an egg-larval endoparasitoid that attacks several lepidopteran species, including the fall armyworm (FAW), Spodoptera frugiperda, as one of its main hosts. In this study, we identified the volatiles emitted by maize plants undamaged and damaged by S. frugiperda larvae that were attractive to virgin C. insularis females. In a Y-glass tube olfactometer, parasitoid females were more attracted to activated charcoal extracts than Porapak Q maize extracts. Chemical analysis of activated charcoal extracts from maize plants damaged by S. frugiperda larvae by gas chromatography coupled with electroantennography (GC-EAD) showed that the antennae of virgin female wasps consistently responded to three compounds, identified by gas chromatography-mass spectrometry (GC-MS) as α-pinene, α-longipinene and α-copaene. These compounds are constitutively released by maize plants but induction via herbivory affects their emissions. α-Longipinene and α-copaene were more abundant in damaged maize plants than in healthy ones, whereas α-pinene was produced in higher amounts in healthy maize plants than in damaged ones. Female parasitoids were not attracted to EAD-active compounds when evaluated singly; however, they were attracted to the binary blend α-pinene + α-copaene, which was the most attractive blend, even more attractive than the tertiary blend (α-pinene + α-longipinene + α-copaene) and the damaged maize plant extracts. We conclude that C. insularis is attracted to a blend of herbivore-induced volatiles emitted by maize plants.
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21
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De Lange ES, Salamanca J, Polashock J, Rodriguez-Saona C. Genotypic Variation and Phenotypic Plasticity in Gene Expression and Emissions of Herbivore-Induced Volatiles, and their Potential Tritrophic Implications, in Cranberries. J Chem Ecol 2019; 45:298-312. [PMID: 30607684 DOI: 10.1007/s10886-018-1043-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 11/28/2018] [Accepted: 12/11/2018] [Indexed: 12/20/2022]
Abstract
Herbivorous insects are important problems in cranberry (Vaccinium macrocarpon Ait.) production. The use of chemical pesticides is common practice, but beneficial insects such as natural enemies of herbivores (e.g. predators and parasitoids) could be affected as well. Therefore, we studied the defensive mechanisms that cranberry plants use to combat pests, focusing on herbivore-induced plant volatiles (HIPVs), which can be used to recruit predators and parasitoids foraging for prey or hosts. Then, we used synthetic HIPVs to test the attraction of natural enemies. In a greenhouse, we assessed nine cranberry genotypes for expression of genes involved in HIPV biosynthesis and/or emission of HIPVs. In an experimental field, we assessed whether baiting traps with individual or combinations of HIPVs increased attractiveness to natural enemies. The results showed that different cranberry genotypes vary in their emission of monoterpenes and sesquiterpenes but not in their expression of two genes associated with terpene biosynthesis, α-humulene/β-caryophyllene synthase and (3S,6E)-nerolidol/R-linalool synthase. Induction with methyl jasmonate or herbivore (gypsy moth, Lymantria dispar L.) feeding increased the expression of these genes and emission of HIPVs. The HIPV methyl salicylate (MeSA), alone or in combination with other HIPVs, increased syrphid attraction by 6-fold in the field, while (Z)-3-hexenyl acetate and MeSA repelled ladybeetles and megaspilids, respectively. Linalool and β-caryophyllene elicited no behavioral responses of natural enemies. Elucidating the mechanisms of pest resistance, as well as experimentally augmenting plant defenses such as HIPVs, may contribute to the development of more sustainable pest management practices in crops, including cranberries.
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Affiliation(s)
- Elvira S De Lange
- Department of Entomology and Nematology, University of California Davis, 1 Shields Avenue, 367 Briggs Hall, Davis, CA, 95616, USA.
| | - Jordano Salamanca
- Escuela de Ciencias Agrícolas, Pecuarias y de Medio Ambiente (ECAPMA), Universidad Nacional Abierta y a Distancia (UNAD), Bogotá, Colombia
| | - James Polashock
- Genetic Improvement of Fruits and Vegetables Laboratory, United States Department of Agriculture-Agricultural Research Service, 125A Lake Oswego Road, Chatsworth, NJ, 08019, USA
| | - Cesar Rodriguez-Saona
- Department of Entomology, Philip E. Marucci Center for Blueberry and Cranberry Research and Extension, Rutgers University, 125A Lake Oswego Road, Chatsworth, NJ, 08019, USA
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22
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Mäntylä E, Kleier S, Lindstedt C, Kipper S, Hilker M. Insectivorous Birds Are Attracted by Plant Traits Induced by Insect Egg Deposition. J Chem Ecol 2018; 44:1127-1138. [PMID: 30417204 DOI: 10.1007/s10886-018-1034-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 10/03/2018] [Accepted: 10/08/2018] [Indexed: 01/26/2023]
Abstract
Insectivorous birds feed upon all developmental stages of herbivorous insects, including insect eggs if larvae and adults are unavailable. Insect egg deposition on plants can induce plant traits that are subsequently exploited by egg parasitoids searching for hosts. However, it is unknown whether avian predators can also use egg-induced plant changes for prey localization. Here, we studied whether great tits (Parus major) and blue tits (Cyanistes caeruleus) are attracted by traits of the Scots pine (Pinus sylvestris) induced by pine sawfly (Diprion pini) egg deposition. We chose this plant - insect system because sawfly egg deposition on pine needles is known to locally and systemically induce a change in pine volatile organic compounds (VOCs), and tits are known to prey upon sawfly eggs. In dual choice laboratory experiments, we simultaneously offered the birds an egg-free control branch and a systemically egg-induced branch. Significantly more birds visited the egg-induced branch first. We confirmed by GC-MS analyses that systemically egg-induced branches released more (E)-β-farnesene compared to control branches. Spectrophotometric analyses showed that control branches reflected more light than egg-induced branches throughout the avian visual range. Although a discrimination threshold model for blue tits suggests that the birds are poor at discriminating this visual difference, the role of visual stimuli in attracting the birds to egg-induced pines cannot be discounted. Our study shows, for the first time, that egg-induced odorous and/or visual plant traits can help birds to locate insect eggs without smelling or seeing those eggs.
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Affiliation(s)
- Elina Mäntylä
- Applied Zoology/Animal Ecology, Institute of Biology, Freie Universität Berlin, Haderslebener Str. 9, DE-12163, Berlin, Germany. .,Institute of Entomology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, CZ-37005, České Budějovice, Czech Republic.
| | - Sven Kleier
- Applied Zoology/Animal Ecology, Institute of Biology, Freie Universität Berlin, Haderslebener Str. 9, DE-12163, Berlin, Germany
| | - Carita Lindstedt
- Centre of Excellence in Biological Interactions, Department of Biological and Environmental Sciences, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
| | - Silke Kipper
- Animal Behaviour, Institute of Biology, Freie Universität Berlin, Takustr. 6, DE-14195, Berlin, Germany.,Chair of Zoology, Technische Universität München, Liesel-Beckmann-Str. 4, DE-85350, Freising, Germany
| | - Monika Hilker
- Applied Zoology/Animal Ecology, Institute of Biology, Freie Universität Berlin, Haderslebener Str. 9, DE-12163, Berlin, Germany
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23
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de Lange ES, Farnier K, Degen T, Gaudillat B, Aguilar-Romero R, Bahena-Juárez F, Oyama K, Turlings TCJ. Parasitic Wasps Can Reduce Mortality of Teosinte Plants Infested With Fall Armyworm: Support for a Defensive Function of Herbivore-Induced Plant Volatiles. Front Ecol Evol 2018. [DOI: 10.3389/fevo.2018.00055] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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24
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Rapid Screening of Volatile Organic Compounds from Aframomum danielli Seeds Using Headspace Solid Phase Microextraction Coupled to Gas Chromatography Mass Spectrometry. Int J Anal Chem 2018; 2018:8976304. [PMID: 29849643 PMCID: PMC5933046 DOI: 10.1155/2018/8976304] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 03/13/2018] [Indexed: 12/03/2022] Open
Abstract
Volatile organic compounds (VOCs) derived from plants have been used in the fragrance industry since time immemorial. Herein we report on the rapid screening of VOCs from seeds of ripe Aframomum danielli (family, Zingiberaceae) using a polydimethylsiloxane fibre headspace solid phase microextraction coupled to a gas chromatography mass spectrometry (SPME-GC/MS) instrument. Portions of 0.25, 0.35, and 0.50 g of ground sample were weighed and extraction of volatile organic compounds (VOCs) was achieved using a 100 μm polydimethylsiloxane solid phase microextraction (PDMS SPME) fibre, with the equilibrium time of 40 minutes and extraction temperature of 50°C; the following compounds with their respective relative abundances were obtained as the top ten most abundant and annotated ones using NIST, Wiley, and Fragrances Libraries: eucalyptol (58%); β-pinene (22%); α-pinene (7.5%); α-terpineol (4%), α-terpinyl acetate (2%); α-bergamotene (1%); pinocarveol (0.39%); α-copaene (0.35%); caryophyllene (0.34); and β-bisabolene (0.31%). These compounds have been reported elsewhere in the literature and listed in the Fragrances Library, incorporated into the Saturn QP2020 GCMS Solution® software used for their analysis.
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Aartsma Y, Bianchi FJJA, van der Werf W, Poelman EH, Dicke M. Herbivore-induced plant volatiles and tritrophic interactions across spatial scales. THE NEW PHYTOLOGIST 2017; 216:1054-1063. [PMID: 28195346 PMCID: PMC6079636 DOI: 10.1111/nph.14475] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 01/14/2017] [Indexed: 05/19/2023]
Abstract
Herbivore-induced plant volatiles (HIPVs) are an important cue used in herbivore location by carnivorous arthropods such as parasitoids. The effects of plant volatiles on parasitoids have been well characterised at small spatial scales, but little research has been done on their effects at larger spatial scales. The spatial matrix of volatiles ('volatile mosaic') within which parasitoids locate their hosts is dynamic and heterogeneous. It is shaped by the spatial pattern of HIPV-emitting plants, the concentration, chemical composition and breakdown of the emitted HIPV blends, and by environmental factors such as wind, turbulence and vegetation that affect transport and mixing of odour plumes. The volatile mosaic may be exploited differentially by different parasitoid species, in relation to species traits such as sensory ability to perceive volatiles and the physical ability to move towards the source. Understanding how HIPVs influence parasitoids at larger spatial scales is crucial for our understanding of tritrophic interactions and sustainable pest management in agriculture. However, there is a large gap in our knowledge on how volatiles influence the process of host location by parasitoids at the landscape scale. Future studies should bridge the gap between the chemical and behavioural ecology of tritrophic interactions and landscape ecology.
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Affiliation(s)
- Yavanna Aartsma
- Farming Systems EcologyWageningen UniversityPO Box 430Wageningen6700 AKthe Netherlands
- Laboratory of EntomologyWageningen UniversityPO Box 16Wageningen6700 AAthe Netherlands
- Centre for Crop Systems AnalysisWageningen UniversityPO Box 430Wageningen6700 AKthe Netherlands
| | | | - Wopke van der Werf
- Centre for Crop Systems AnalysisWageningen UniversityPO Box 430Wageningen6700 AKthe Netherlands
| | - Erik H. Poelman
- Laboratory of EntomologyWageningen UniversityPO Box 16Wageningen6700 AAthe Netherlands
| | - Marcel Dicke
- Laboratory of EntomologyWageningen UniversityPO Box 16Wageningen6700 AAthe Netherlands
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Nocturnal herbivore-induced plant volatiles attract the generalist predatory earwig Doru luteipes Scudder. Naturwissenschaften 2017; 104:77. [PMID: 28871442 DOI: 10.1007/s00114-017-1498-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 08/10/2017] [Accepted: 08/19/2017] [Indexed: 10/18/2022]
Abstract
Numerous studies have demonstrated that entomophagous arthropods use herbivore-induced plant volatile (HIPV) blends to search for their prey or host. However, no study has yet focused on the response of nocturnal predators to volatile blends emitted by prey damaged plants. We investigated the olfactory behavioral responses of the night-active generalist predatory earwig Doru luteipes Scudder (Dermaptera: Forficulidae) to diurnal and nocturnal volatile blends emitted by maize plants (Zea mays) attacked by either a stem borer (Diatraea saccharalis) or a leaf-chewing caterpillar (Spodoptera frugiperda), both suitable lepidopteran prey. Additionally, we examined whether the earwig preferred odors emitted from short- or long-term damaged maize. We first determined the earwig diel foraging rhythm and confirmed that D. luteipes is a nocturnal predator. Olfactometer assays showed that during the day, although the earwigs were walking actively, they did not discriminate the volatiles of undamaged maize plants from those of herbivore damaged maize plants. In contrast, at night, earwigs preferred volatiles emitted by maize plants attacked by D. saccharalis or S. frugiperda over undamaged plants and short- over long-term damaged maize. Our GC-MS analysis revealed that short-term damaged nocturnal plant volatile blends were comprised mainly of fatty acid derivatives (i.e., green leaf volatiles), while the long-term damaged plant volatile blend contained mostly terpenoids. We also observed distinct volatile blend composition emitted by maize damaged by the different caterpillars. Our results showed that D. luteipes innately uses nocturnal herbivore-induced plant volatiles to search for prey. Moreover, the attraction of the earwig to short-term damaged plants is likely mediated by fatty acid derivatives.
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Perez LI, Gundel PE, Marrero HJ, Arzac AG, Omacini M. Symbiosis with systemic fungal endophytes promotes host escape from vector-borne disease. Oecologia 2017; 184:237-245. [PMID: 28315955 DOI: 10.1007/s00442-017-3850-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 03/08/2017] [Indexed: 10/19/2022]
Abstract
Plants interact with a myriad of microorganisms that modulate their interactions within the community. A well-described example is the symbiosis between grasses and Epichloë fungal endophytes that protects host plants from herbivores. It is suggested that these symbionts could play a protective role for plants against pathogens through the regulation of their growth and development and/or the induction of host defences. However, other endophyte-mediated ecological mechanisms involved in disease avoidance have been scarcely explored. Here we studied the endophyte impact on plant disease caused by the biotrophic fungus, Claviceps purpurea, under field conditions through (1) changes in the survival of the pathogen´s resistance structure (sclerotia) during overwintering on the soil surface, and (2) effects on insects responsible for the transportation of pathogen spores. This latter mechanism is tested through a visitor exclusion treatment and the measurement of plant volatile cues. We found no significant effects of the endophyte on the survival of sclerotia and thus on disease inocula. However, both pathogen incidence and severity were twofold lower in endophyte-symbiotic plants than in non-symbiotic ones, though when insect visits were prevented this difference disappeared. Endophyte-symbiotic and non-symbiotic plots presented different emission patterns of volatiles suggesting that they can play a role in this protection. We show a novel indirect ecological mechanism by which endophytes can defend host grasses against diseases through negatively interacting with intermediary vectors of the epidemic process.
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Affiliation(s)
- L I Perez
- IFEVA-Facultad de Agronomía (UBA)/CONICET, Cátedra de Ecología, Av. San Martín 4453, C1417DSE, Buenos Aires, Argentina.
| | - P E Gundel
- IFEVA-Facultad de Agronomía (UBA)/CONICET, Cátedra de Ecología, Av. San Martín 4453, C1417DSE, Buenos Aires, Argentina
| | - H J Marrero
- Instituto Argentino de Investigaciones de las Zonas Áridas, CONICET, CC 507, 5500, Mendoza, Argentina
| | - A González Arzac
- IFEVA-Facultad de Agronomía (UBA)/CONICET, Cátedra de Ecología, Av. San Martín 4453, C1417DSE, Buenos Aires, Argentina
| | - M Omacini
- IFEVA-Facultad de Agronomía (UBA)/CONICET, Cátedra de Ecología, Av. San Martín 4453, C1417DSE, Buenos Aires, Argentina
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Deasy W, Shepherd T, Alexander CJ, Birch ANE, Evans KA. Field-based Evaluation of a Novel SPME-GC-MS Method for Investigation of Below-ground Interaction between Brassica Roots and Larvae of Cabbage Root Fly, Delia radicum L. PHYTOCHEMICAL ANALYSIS : PCA 2016; 27:343-353. [PMID: 27689319 DOI: 10.1002/pca.2634] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 05/03/2016] [Accepted: 05/19/2016] [Indexed: 06/06/2023]
Abstract
INTRODUCTION Collection of volatiles from plant roots poses technical challenges due to difficulties accessing the soil environment without damaging the roots. OBJECTIVES To validate a new non-invasive method for passive sampling of root volatiles in situ, from plants grown under field conditions, using solid phase micro-extraction (SPME). METHODS SPME fibres were inserted into perforated polytetrafluoroethene (PTFE) tubes positioned in the soil next to broccoli plants for collection of root volatiles pre- and post-infestation with Delia radicum larvae. After sample analysis by gas chromatography-mass spectrometry (GC-MS), principal component analysis (PCA) was applied to determine differences in the profiles of volatiles between samples. RESULTS GC-MS analysis revealed that this method can detect temporal changes in root volatiles emitted before and after Delia radicum damage. PCA showed that samples collected pre- and post-infestation were compositionally different due to the presence of root volatiles induced by D. radicum feeding. Sulphur containing compounds, in particular, accounted for the differences observed. Root volatiles emission patterns post-infestation are thought to follow the feeding and developmental progress of larvae. CONCLUSION This study shows that volatiles released by broccoli roots can be collected in situ using SPME fibres within perforated PTFE tubes under field conditions. Plants damaged by Delia radicum larvae could be distinguished from plants sampled pre-infestation and soil controls on the basis of larval feeding-induced sulphur-containing volatiles. These results show that this new method is a powerful tool for non-invasive sampling of root volatiles below-ground. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- William Deasy
- The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, UK
- Scotland's Rural College, Nicholas Kemmer Road, Edinburgh, EH9 3FH, UK
- School of Biological Sciences, The University of Edinburgh, Darwin Building, The King's Buildings, Max Born Crescent, Edinburgh, EH9 3BF, UK
| | - Tom Shepherd
- The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, UK.
| | - Colin J Alexander
- Biomathematics and Statistics Scotland, Invergowrie, Dundee, DD2 5DA, UK
| | | | - K Andrew Evans
- Scotland's Rural College, Nicholas Kemmer Road, Edinburgh, EH9 3FH, UK
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Deasy W, Shepherd T, Alexander CJ, Birch ANE, Evans KA. Development and Validation of a SPME-GC-MS Method for In situ Passive Sampling of Root Volatiles from Glasshouse-Grown Broccoli Plants Undergoing Below-Ground Herbivory by Larvae of Cabbage Root Fly, Delia radicum L. PHYTOCHEMICAL ANALYSIS : PCA 2016; 27:375-393. [PMID: 27687886 DOI: 10.1002/pca.2637] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 06/27/2016] [Accepted: 07/01/2016] [Indexed: 05/20/2023]
Abstract
INTRODUCTION Research on plant root chemical ecology has benefited greatly from recent developments in analytical chemistry. Numerous reports document techniques for sampling root volatiles, although only a limited number describe in situ collection. OBJECTIVES To demonstrate a new method for non-invasive in situ passive sampling using solid phase micro extraction (SPME), from the immediate vicinity of growing roots. METHODS SPME fibres inserted into polyfluorotetrafluoroethylene (PTFE) sampling tubes located in situ which were either perforated, covered with stainless steel mesh or with microporous PTFE tubing, were used for non-invasive sub-surface sampling of root volatiles from glasshouse-grown broccoli. Sampling methods were compared with above surface headspace collection using Tenax TA. The roots were either mechanically damaged or infested with Delia radicum larvae. Principal component analysis (PCA) was used to investigate the effect of damage on the composition of volatiles released by broccoli roots. RESULTS Analyses by gas chromatography-mass spectrometry (GC-MS) with SPME and automated thermal desorption (ATD) confirmed that sulphur compounds, showing characteristic temporal emission patterns, were the principal volatiles released by roots following insect larval damage. Use of SPME with in situ perforated PTFE sampling tubes was the most robust method for out-of-lab sampling. CONCLUSION This study describes a new method for non-invasive passive sampling of volatiles in situ from intact and insect damaged roots using SPME. The method is highly suitable for remote sampling and has potential for wide application in chemical ecology/root/soil research. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- William Deasy
- The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, UK
- Scotland's Rural College, Nicholas Kemmer Road, Edinburgh, EH9 3FH, UK
- School of Biological Sciences, The University of Edinburgh, Darwin Building, The King's Buildings, Max Born Crescent, Edinburgh, EH9 3BF, UK
| | - Tom Shepherd
- The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, UK.
| | - Colin J Alexander
- Biomathematics and Statistics Scotland, Invergowrie, Dundee, DD2 5DA, UK
| | | | - K Andrew Evans
- Scotland's Rural College, Nicholas Kemmer Road, Edinburgh, EH9 3FH, UK
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Dicke M. Plant phenotypic plasticity in the phytobiome: a volatile issue. CURRENT OPINION IN PLANT BIOLOGY 2016; 32:17-23. [PMID: 27267277 DOI: 10.1016/j.pbi.2016.05.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Revised: 05/20/2016] [Accepted: 05/24/2016] [Indexed: 05/09/2023]
Abstract
Plants live in a diverse and dynamic phytobiome, consisting of a microbiome as well as a macrobiome. They respond to arthropod herbivory with the emission of herbivore-induced plant volatiles (HIPV) that are public information and can be used by any member of the phytobiome. Other members of the phytobiome, which do not directly participate in the interaction, may both modulate the induction of HIPV in the plant, as well as respond to the volatiles. The use of HIPV by individual phytobiome members may have beneficial as well as detrimental consequences for the plant. The collective result of phytobiome-modulated HIPV emission on the responses of phytobiome members and the resulting phytobiome dynamics will determine whether and under which circumstances HIPV emission has a net benefit to the plant or not. Only when we understand HIPV emission in the total phytobiome context can we understand the evolutionary consequences of HIPV emission by plants.
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Affiliation(s)
- Marcel Dicke
- Laboratory of Entomology, Wageningen University, Droevendaalsesteeg 1, 6708PB Wageningen, The Netherlands.
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Fürstenau B, Adler C, Schulz H, Hilker M. Host Habitat Volatiles Enhance the Olfactory Response of the Larval Parasitoid Holepyris sylvanidis to Specifically Host-Associated Cues. Chem Senses 2016; 41:611-21. [PMID: 27261526 DOI: 10.1093/chemse/bjw065] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Host foraging of parasitic wasps attacking insects living in stored food may be guided by volatile cues emanating from these postharvest products. However, little knowledge is available as to how habitat odor released from noninfested stored food affects the parasitoid's response to host-specific chemicals. In this study, we investigated the impact of wheat grist odor on the olfactory host search by the ectoparasitoid Holepyris sylvanidis This parasitoid attacks larvae of the confused flour beetle Tribolium confusum, a common pest of grain products. Olfactometer bioassays showed that female H. sylvanidis were attracted by volatiles released from host larval feces, whereas odor of noninfested wheat grist was neither attractive nor did it mask the host-indicating cues. We analyzed the odor of host larval feces and wheat grist by coupled gaschromatography-mass spectrometry and recorded the parasitoid's electroantennographic (EAG) responses to the detected volatiles. Two specifically host-associated components of the fecal odor, (E)-2-nonenal and 1-pentadecene, elicited strong EAG responses. Both components were attractive when tested individually, but less than larval feces. Attraction of parasitoids to these host-specific key compounds was enhanced by addition of (i) noninfested habitat substrate odor or (ii) a blend of 3 EAG-active (but not behaviorally active) volatiles that had been identified in odor of noninfested grist (benzaldehyde, 1-tetradecene, 1-hexadecene), but were also detected in the host fecal odor. The impact of these volatiles ubiquitously released in a food store by noninfested habitat substrate on the parasitoid's orientation to host-specific volatile cues is discussed.
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Affiliation(s)
- Benjamin Fürstenau
- Applied Zoology/Animal Ecology, Institute of Biology, Dahlem Centre of Plant Sciences, Freie Universität Berlin, Haderslebener Str. 9, 12163 Berlin, Germany and
| | - Cornel Adler
- Institute for Ecological Chemistry, Plant Analysis and Stored Product Protection (ÖPV), JKI Berlin-Dahlem, Königin-Luise-Str. 19, 14195 Berlin, Germany
| | - Hartwig Schulz
- Institute for Ecological Chemistry, Plant Analysis and Stored Product Protection (ÖPV), JKI Berlin-Dahlem, Königin-Luise-Str. 19, 14195 Berlin, Germany
| | - Monika Hilker
- Applied Zoology/Animal Ecology, Institute of Biology, Dahlem Centre of Plant Sciences, Freie Universität Berlin, Haderslebener Str. 9, 12163 Berlin, Germany and
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Kusano M, Kobayashi M, Iizuka Y, Fukushima A, Saito K. Unbiased profiling of volatile organic compounds in the headspace of Allium plants using an in-tube extraction device. BMC Res Notes 2016; 9:133. [PMID: 26928722 PMCID: PMC4772445 DOI: 10.1186/s13104-016-1942-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Accepted: 02/17/2016] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Plants produce and emit important volatile organic compounds (VOCs), which have an essential role in biotic and abiotic stress responses and in plant-plant and plant-insect interactions. In order to study the bouquets from plants qualitatively and quantitatively, a comprehensive, analytical method yielding reproducible results is required. RESULTS We applied in-tube extraction (ITEX) and solid-phase microextraction (SPME) for studying the emissions of Allium plants. The collected HS samples were analyzed by gas chromatography-time-of-flight-mass spectrometry (GC-TOF-MS), and the results were subjected to multivariate analysis. In case of ITEX-method Allium cultivars released more than 300 VOCs, out of which we provisionally identified 50 volatiles. We also used the VOC profiles of Allium samples to discriminate among groups of A. fistulosum, A. chinense (rakkyo), and A. tuberosum (Oriental garlic). As we found 12 metabolite peaks including dipropyl disulphide with significant changes in A. chinense and A. tuberosum when compared to the control cultivar, these metabolite peaks can be used for chemotaxonomic classification of A. chinense, tuberosum, and A. fistulosum. CONCLUSIONS Compared to SPME-method our ITEX-based VOC profiling technique contributes to automatic and reproducible analyses. Hence, it can be applied to high-throughput analyses such as metabolite profiling.
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Affiliation(s)
- Miyako Kusano
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki, Japan.
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, Japan.
| | - Makoto Kobayashi
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, Japan.
| | - Yumiko Iizuka
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, Japan.
- Department of Genome System Science, Graduate School of Nanobioscience, Yokohama City University, Yokohama, Kanagawa, Japan.
| | - Atsushi Fukushima
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, Japan.
| | - Kazuki Saito
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, Japan.
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Chiba, Japan.
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Comparing the attraction of two parasitoids to herbivore-induced volatiles of maize and its wild ancestors, the teosintes. CHEMOECOLOGY 2016. [DOI: 10.1007/s00049-015-0205-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Cai XM, Xu XX, Bian L, Luo ZX, Chen ZM. Measurement of volatile plant compounds in field ambient air by thermal desorption–gas chromatography–mass spectrometry. Anal Bioanal Chem 2015; 407:9105-14. [DOI: 10.1007/s00216-015-9076-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Revised: 09/14/2015] [Accepted: 09/23/2015] [Indexed: 11/30/2022]
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Wang L, Niu Q, Hui Y, Jin H. Discrimination of Rice with Different Pretreatment Methods by Using a Voltammetric Electronic Tongue. SENSORS 2015. [PMID: 26205274 PMCID: PMC4541958 DOI: 10.3390/s150717767] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In this study, an application of a voltammetric electronic tongue for discrimination and prediction of different varieties of rice was investigated. Different pretreatment methods were selected, which were subsequently used for the discrimination of different varieties of rice and prediction of unknown rice samples. To this aim, a voltammetric array of sensors based on metallic electrodes was used as the sensing part. The different samples were analyzed by cyclic voltammetry with two sample-pretreatment methods. Discriminant Factorial Analysis was used to visualize the different categories of rice samples; however, radial basis function (RBF) artificial neural network with leave-one-out cross-validation method was employed for prediction modeling. The collected signal data were first compressed employing fast Fourier transform (FFT) and then significant features were extracted from the voltammetric signals. The experimental results indicated that the sample solutions obtained by the non-crushed pretreatment method could efficiently meet the effect of discrimination and recognition. The satisfactory prediction results of voltammetric electronic tongue based on RBF artificial neural network were obtained with less than five-fold dilution of the sample solution. The main objective of this study was to develop primary research on the application of an electronic tongue system for the discrimination and prediction of solid foods and provide an objective assessment tool for the food industry.
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Affiliation(s)
- Li Wang
- School of Electrical Engineering, Henan University of Technology, Zhengzhou 450007, China.
| | - Qunfeng Niu
- School of Electrical Engineering, Henan University of Technology, Zhengzhou 450007, China.
| | - Yanbo Hui
- School of Electrical Engineering, Henan University of Technology, Zhengzhou 450007, China.
| | - Huali Jin
- School of Food Science and Engineering, Henan University of Technology, Zhengzhou 450007, China.
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Amorós-Jiménez R, Robert CAM, Marcos-García MÁ, Fereres A, Turlings TCJ. A Differential Role of Volatiles from Conspecific and Heterospecific Competitors in the Selection of Oviposition Sites by the Aphidophagous Hoverfly Sphaerophoria rueppellii. J Chem Ecol 2015; 41:493-500. [DOI: 10.1007/s10886-015-0583-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 03/02/2015] [Accepted: 04/21/2015] [Indexed: 11/29/2022]
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Chen YH, Gols R, Benrey B. Crop domestication and its impact on naturally selected trophic interactions. ANNUAL REVIEW OF ENTOMOLOGY 2015; 60:35-58. [PMID: 25341108 DOI: 10.1146/annurev-ento-010814-020601] [Citation(s) in RCA: 180] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Crop domestication is the process of artificially selecting plants to increase their suitability to human requirements: taste, yield, storage, and cultivation practices. There is increasing evidence that crop domestication can profoundly alter interactions among plants, herbivores, and their natural enemies. Overall, little is known about how these interactions are affected by domestication in the geographical ranges where these crops originate, where they are sympatric with the ancestral plant and share the associated arthropod community. In general, domestication consistently has reduced chemical resistance against herbivorous insects, improving herbivore and natural enemy performance on crop plants. More studies are needed to understand how changes in morphology and resistance-related traits arising from domestication may interact with environmental variation to affect species interactions across multiple scales in agroecosystems and natural ecosystems.
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Affiliation(s)
- Yolanda H Chen
- Department of Plant and Soil Sciences, University of Vermont, Burlington, Vermont 05405;
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Sobhy IS, Erb M, Lou Y, Turlings TCJ. The prospect of applying chemical elicitors and plant strengtheners to enhance the biological control of crop pests. Philos Trans R Soc Lond B Biol Sci 2014; 369:20120283. [PMID: 24535390 PMCID: PMC3928887 DOI: 10.1098/rstb.2012.0283] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
An imminent food crisis reinforces the need for novel strategies to increase crop yields worldwide. Effective control of pest insects should be part of such strategies, preferentially with reduced negative impact on the environment and optimal protection and utilization of existing biodiversity. Enhancing the presence and efficacy of native biological control agents could be one such strategy. Plant strengthener is a generic term for several commercially available compounds or mixtures of compounds that can be applied to cultivated plants in order to 'boost their vigour, resilience and performance'. Studies into the consequences of boosting plant resistance against pests and diseases on plant volatiles have found a surprising and dramatic increase in the plants' attractiveness to parasitic wasps. Here, we summarize the results from these studies and present new results from assays that illustrate the great potential of two commercially available resistance elicitors. We argue that plant strengtheners may currently be the best option to enhance the attractiveness of cultivated plants to biological control agents. Other options, such as the genetic manipulation of the release of specific volatiles may offer future solutions, but in most systems, we still miss fundamental knowledge on which key attractants should be targeted for this approach.
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Affiliation(s)
- Islam S. Sobhy
- Laboratory of Fundamental and Applied Research in Chemical Ecology, Institute of Biology, University of Neuchâtel, Rue Emile-Argand 11, CP158, Neuchâtel 2009, Switzerland
- Department of Plant Protection, Public Service Center of Biological Control (PSCBC), Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt
- Biological Chemistry and Crop Protection (BCCP) Department, Rothamsted Research, Harpenden, Herts AL5 2JQ, UK
| | - Matthias Erb
- Laboratory of Fundamental and Applied Research in Chemical Ecology, Institute of Biology, University of Neuchâtel, Rue Emile-Argand 11, CP158, Neuchâtel 2009, Switzerland
- Root-Herbivore Interactions Group, Max Planck Institute for Chemical Ecology, Hans-Knöll-Strasse 8, Jena 07745, Germany
| | - Yonggen Lou
- State Key Laboratory of Rice Biology, Institute of Insect Science, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Ted C. J. Turlings
- Laboratory of Fundamental and Applied Research in Chemical Ecology, Institute of Biology, University of Neuchâtel, Rue Emile-Argand 11, CP158, Neuchâtel 2009, Switzerland
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Advances in the Analysis of Volatile Isoprenoid Metabolites. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2014; 148:201-13. [DOI: 10.1007/10_2014_278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Stam JM, Kroes A, Li Y, Gols R, van Loon JJA, Poelman EH, Dicke M. Plant interactions with multiple insect herbivores: from community to genes. ANNUAL REVIEW OF PLANT BIOLOGY 2014; 65:689-713. [PMID: 24313843 DOI: 10.1146/annurev-arplant-050213-035937] [Citation(s) in RCA: 227] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Every plant is a member of a complex insect community that consists of tens to hundreds of species that belong to different trophic levels. The dynamics of this community are critically influenced by the plant, which mediates interactions between community members that can occur on the plant simultaneously or at different times. Herbivory results in changes in the plant's morphological or chemical phenotype that affect interactions with subsequently arriving herbivores. Changes in the plant's phenotype are mediated by molecular processes such as phytohormonal signaling networks and transcriptomic rearrangements that are initiated by oral secretions of the herbivore. Processes at different levels of biological complexity occur at timescales ranging from minutes to years. In this review, we address plant-mediated interactions with multiple species of the associated insect community and their effects on community dynamics, and link these to the mechanistic effects that multiple attacks have on plant phenotypes.
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Affiliation(s)
- Jeltje M Stam
- Laboratory of Entomology, Wageningen University, 6700 EH Wageningen, The Netherlands;
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Wason EL, Hunter MD. Genetic variation in plant volatile emission does not result in differential attraction of natural enemies in the field. Oecologia 2013; 174:479-91. [DOI: 10.1007/s00442-013-2787-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 09/12/2013] [Indexed: 11/27/2022]
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Arguello JR, Sellanes C, Lou YR, Raguso RA. Can yeast (S. cerevisiae) metabolic volatiles provide polymorphic signaling? PLoS One 2013; 8:e70219. [PMID: 23990899 PMCID: PMC3747187 DOI: 10.1371/journal.pone.0070219] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2013] [Accepted: 06/17/2013] [Indexed: 01/13/2023] Open
Abstract
Chemical signaling between organisms is a ubiquitous and evolutionarily dynamic process that helps to ensure mate recognition, location of nutrients, avoidance of toxins, and social cooperation. Evolutionary changes in chemical communication systems progress through natural variation within the organism generating the signal as well as the responding individuals. A promising yet poorly understood system with which to probe the importance of this variation exists between D. melanogaster and S. cerevisiae. D. melanogaster relies on yeast for nutrients, while also serving as a vector for yeast cell dispersal. Both are outstanding genetic and genomic models, with Drosophila also serving as a preeminent model for sensory neurobiology. To help develop these two genetic models as an ecological model, we have tested if - and to what extent - S. cerevisiae is capable of producing polymorphic signaling through variation in metabolic volatiles. We have carried out a chemical phenotyping experiment for 14 diverse accessions within a common garden random block design. Leveraging genomic sequences for 11 of the accessions, we ensured a genetically broad sample and tested for phylogenetic signal arising from phenotypic dataset. Our results demonstrate that significant quantitative differences for volatile blends do exist among S. cerevisiae accessions. Of particular ecological relevance, the compounds driving the blend differences (acetoin, 2-phenyl ethanol and 3-methyl-1-butanol) are known ligands for D. melanogasters chemosensory receptors, and are related to sensory behaviors. Though unable to correlate the genetic and volatile measurements, our data point clear ways forward for behavioral assays aimed at understanding the implications of this variation.
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Affiliation(s)
- J. Roman Arguello
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, United States of America
| | - Carolina Sellanes
- Laboratiro de Ecología Química, Facultad de Química, Universidad de la Repúlica, Montevideo, Uruguay
| | - Yann Ru Lou
- Department of Plant Biology, Cornell University, Ithaca, New York, United States of America
| | - Robert A. Raguso
- Department of Neurobiology and Behavior, Cornell University, Ithaca, New York, United States of America
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Robert CAM, Erb M, Hiltpold I, Hibbard BE, Gaillard MDP, Bilat J, Degenhardt J, Cambet-Petit-Jean X, Turlings TCJ, Zwahlen C. Genetically engineered maize plants reveal distinct costs and benefits of constitutive volatile emissions in the field. PLANT BIOTECHNOLOGY JOURNAL 2013; 11:628-39. [PMID: 23425633 DOI: 10.1111/pbi.12053] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Accepted: 01/11/2013] [Indexed: 05/04/2023]
Abstract
Genetic manipulation of plant volatile emissions is a promising tool to enhance plant defences against herbivores. However, the potential costs associated with the manipulation of specific volatile synthase genes are unknown. Therefore, we investigated the physiological and ecological effects of transforming a maize line with a terpene synthase gene in field and laboratory assays, both above- and below ground. The transformation, which resulted in the constitutive emission of (E)-β-caryophyllene and α-humulene, was found to compromise seed germination, plant growth and yield. These physiological costs provide a possible explanation for the inducibility of an (E)-β-caryophyllene-synthase gene in wild and cultivated maize. The overexpression of the terpene synthase gene did not impair plant resistance nor volatile emission. However, constitutive terpenoid emission increased plant apparency to herbivores, including adults and larvae of the above ground pest Spodoptera frugiperda, resulting in an increase in leaf damage. Although terpenoid overproducing lines were also attractive to the specialist root herbivore Diabrotica virgifera virgifera below ground, they did not suffer more root damage in the field, possibly because of the enhanced attraction of entomopathogenic nematodes. Furthermore, fewer adults of the root herbivore Diabrotica undecimpunctata howardii were found to emerge near plants that emitted (E)-β-caryophyllene and α-humulene. Yet, overall, under the given field conditions, the costs of constitutive volatile production overshadowed its benefits. This study highlights the need for a thorough assessment of the physiological and ecological consequences of genetically engineering plant signals in the field to determine the potential of this approach for sustainable pest management strategies.
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Affiliation(s)
- Christelle Aurélie Maud Robert
- Laboratory for Fundamental and Applied Research in Chemical Ecology-FARCE, University of Neuchâtel, Neuchâtel, Switzerland
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Kusano M, Iizuka Y, Kobayashi M, Fukushima A, Saito K. Development of a Direct Headspace Collection Method from Arabidopsis Seedlings Using HS-SPME-GC-TOF-MS Analysis. Metabolites 2013; 3:223-42. [PMID: 24957989 PMCID: PMC3901263 DOI: 10.3390/metabo3020223] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 03/21/2013] [Accepted: 03/26/2013] [Indexed: 12/27/2022] Open
Abstract
Plants produce various volatile organic compounds (VOCs), which are thought to be a crucial factor in their interactions with harmful insects, plants and animals. Composition of VOCs may differ when plants are grown under different nutrient conditions, i.e., macronutrient-deficient conditions. However, in plants, relationships between macronutrient assimilation and VOC composition remain unclear. In order to identify the kinds of VOCs that can be emitted when plants are grown under various environmental conditions, we established a conventional method for VOC profiling in Arabidopsis thaliana (Arabidopsis) involving headspace-solid-phase microextraction-gas chromatography-time-of-flight-mass spectrometry (HS-SPME-GC-TOF-MS). We grew Arabidopsis seedlings in an HS vial to directly perform HS analysis. To maximize the analytical performance of VOCs, we optimized the extraction method and the analytical conditions of HP-SPME-GC-TOF-MS. Using the optimized method, we conducted VOC profiling of Arabidopsis seedlings, which were grown under two different nutrition conditions, nutrition-rich and nutrition-deficient conditions. The VOC profiles clearly showed a distinct pattern with respect to each condition. This study suggests that HS-SPME-GC-TOF-MS analysis has immense potential to detect changes in the levels of VOCs in not only Arabidopsis, but other plants grown under various environmental conditions.
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Affiliation(s)
- Miyako Kusano
- RIKEN Plant Science Center, Tsurumi, Yokohama 230-0045, Japan.
| | - Yumiko Iizuka
- RIKEN Plant Science Center, Tsurumi, Yokohama 230-0045, Japan.
| | | | | | - Kazuki Saito
- RIKEN Plant Science Center, Tsurumi, Yokohama 230-0045, Japan.
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von Mérey GE, Veyrat N, D'Alessandro M, Turlings TCJ. Herbivore-induced maize leaf volatiles affect attraction and feeding behavior of Spodoptera littoralis caterpillars. FRONTIERS IN PLANT SCIENCE 2013; 4:209. [PMID: 23825475 PMCID: PMC3695448 DOI: 10.3389/fpls.2013.00209] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 06/02/2013] [Indexed: 05/03/2023]
Abstract
Plants under herbivore attack emit volatile organic compounds (VOCs) that can serve as foraging cues for natural enemies. Adult females of Lepidoptera, when foraging for host plants to deposit eggs, are commonly repelled by herbivore-induced VOCs, probably to avoid competition and natural enemies. Their larval stages, on the other hand, have been shown to be attracted to inducible VOCs. We speculate that this contradicting behavior of lepidopteran larvae is due to a need to quickly find a new suitable host plant if they have fallen to the ground. However, once they are on a plant they might avoid the sites with fresh damage to limit competition and risk of cannibalism by conspecifics, as well as exposure to natural enemies. To test this we studied the effect of herbivore-induced VOCs on the attraction of larvae of the moth Spodoptera littoralis and on their feeding behavior. The experiments further considered the importance of previous feeding experience on the responses of the larvae. It was confirmed that herbivore-induced VOCs emitted by maize plants are attractive to the larvae, but exposure to the volatiles decreased the growth rate of caterpillars at early developmental stages. Larvae that had fed on maize previously were more attracted by VOCs of induced maize than larvae that had fed on artificial diet. At relatively high concentrations synthetic green leaf volatiles, indicative of fresh damage, also negatively affected the growth rate of caterpillars, but not at low concentrations. In all cases, feeding by the later stages of the larvae was not affected by the VOCs. The results are discussed in the context of larval foraging behavior under natural conditions, where there may be a trade-off between using available host plant signals and avoiding competitors and natural enemies.
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Affiliation(s)
| | | | | | - Ted C. J. Turlings
- *Correspondence: Ted C. J. Turlings, Laboratory for Fundamental and Applied Research in Chemical Ecology, Institute of Biology, University of Neuchâtel, Emile-Argand 11, C.P. 158, CH-2009 Neuchâtel, Switzerland e-mail:
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Lucas-Barbosa D, van Loon JJA, Gols R, van Beek TA, Dicke M. Reproductive escape: annual plant responds to butterfly eggs by accelerating seed production. Funct Ecol 2012. [DOI: 10.1111/1365-2435.12004] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Dani Lucas-Barbosa
- Laboratory of Entomology; Wageningen University; Wageningen; The Netherlands
| | - Joop J. A. van Loon
- Laboratory of Entomology; Wageningen University; Wageningen; The Netherlands
| | - Rieta Gols
- Laboratory of Entomology; Wageningen University; Wageningen; The Netherlands
| | - Teris A. van Beek
- Laboratory of Organic Chemistry; Wageningen University; Wageningen; The Netherlands
| | - Marcel Dicke
- Laboratory of Entomology; Wageningen University; Wageningen; The Netherlands
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Hyperparasitoids use herbivore-induced plant volatiles to locate their parasitoid host. PLoS Biol 2012; 10:e1001435. [PMID: 23209379 PMCID: PMC3507920 DOI: 10.1371/journal.pbio.1001435] [Citation(s) in RCA: 152] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Accepted: 10/17/2012] [Indexed: 11/19/2022] Open
Abstract
Parasitic wasps that develop inside herbivorous hosts alter the volatiles produced by plants in response to the damage, thus giving away the presence of the parasitoid larvae to their hyperparasitoid enemies. Plants respond to herbivory with the emission of induced plant volatiles. These volatiles may attract parasitic wasps (parasitoids) that attack the herbivores. Although in this sense the emission of volatiles has been hypothesized to be beneficial to the plant, it is still debated whether this is also the case under natural conditions because other organisms such as herbivores also respond to the emitted volatiles. One important group of organisms, the enemies of parasitoids, hyperparasitoids, has not been included in this debate because little is known about their foraging behaviour. Here, we address whether hyperparasitoids use herbivore-induced plant volatiles to locate their host. We show that hyperparasitoids find their victims through herbivore-induced plant volatiles emitted in response to attack by caterpillars that in turn had been parasitized by primary parasitoids. Moreover, only one of two species of parasitoids affected herbivore-induced plant volatiles resulting in the attraction of more hyperparasitoids than volatiles from plants damaged by healthy caterpillars. This resulted in higher levels of hyperparasitism of the parasitoid that indirectly gave away its presence through its effect on plant odours induced by its caterpillar host. Here, we provide evidence for a role of compounds in the oral secretion of parasitized caterpillars that induce these changes in plant volatile emission. Our results demonstrate that the effects of herbivore-induced plant volatiles should be placed in a community-wide perspective that includes species in the fourth trophic level to improve our understanding of the ecological functions of volatile release by plants. Furthermore, these findings suggest that the impact of species in the fourth trophic level should also be considered when developing Integrated Pest Management strategies aimed at optimizing the control of insect pests using parasitoids. In nature, plants often release volatiles in response to damage by herbivores (e.g., by caterpillars), and these can indirectly help defend the plants. Indeed, it is well documented that volatiles can recruit the natural enemies of herbivores, such as predators and parasitoid wasps, whose offspring feed on and develop within their caterpillar hosts. However, such induced plant odours can also be detected by other organisms. One important group of organisms, hyperparasitoids, the enemies of the parasitoids that indirectly benefit the plants, have not been included in this trophic web because so little is known about their foraging behaviour. Here, using a combination of laboratory and field experiments, we demonstrate that hyperparasitoid wasps also take advantage of the odours that plants produce in response to the feeding by caterpillars. The larvae of parasitic wasps developing inside the caterpillar alter the composition of the oral secretions of their herbivorous host and thereby affect the cocktail of volatiles the plant produces. The hyperparasitoids on the lookout for their parasitoid prey can preferentially detect infected caterpillars, although not all parasitoid wasps gave away their presence through this host–plant interaction. We conclude that herbivore-induced plant volatiles can affect the interaction among parasitoids and their enemies and thereby may reduce the indirect defence accrued for the plant.
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Electroantennogram responses of an invasive species fall webworm (Hyphantria cunea) to host volatile compounds. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s11434-012-5356-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Robert CAM, Erb M, Duployer M, Zwahlen C, Doyen GR, Turlings TCJ. Herbivore-induced plant volatiles mediate host selection by a root herbivore. THE NEW PHYTOLOGIST 2012; 194:1061-1069. [PMID: 22486361 DOI: 10.1111/j.1469-8137.2012.04127.x] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In response to herbivore attack, plants mobilize chemical defenses and release distinct bouquets of volatiles. Aboveground herbivores are known to use changes in leaf volatile patterns to make foraging decisions, but it remains unclear whether belowground herbivores also use volatiles to select suitable host plants. We therefore investigated how above- and belowground infestation affects the performance of the root feeder Diabrotica virgifera virgifera, and whether the larvae of this specialized beetle are able to use volatile cues to assess from a distance whether a potential host plant is already under herbivore attack. Diabrotica virgifera larvae showed stronger growth on roots previously attacked by conspecific larvae, but performed more poorly on roots of plants whose leaves had been attacked by larvae of the moth Spodoptera littoralis. Fittingly, D. virgifera larvae were attracted to plants that were infested with conspecifics, whereas they avoided plants that were attacked by S. littoralis. We identified (E)-β-caryophyllene, which is induced by D. virgifera, and ethylene, which is suppressed by S. littoralis, as two signals used by D. virgifera larvae to locate plants that are most suitable for their development. Our study demonstrates that soil-dwelling insects can use herbivore-induced changes in root volatile emissions to identify suitable host plants.
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Affiliation(s)
- Christelle A M Robert
- Laboratory for Fundamental and Applied Research in Chemical Ecology (FARCE), University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Matthias Erb
- Laboratory for Fundamental and Applied Research in Chemical Ecology (FARCE), University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
- Root-Herbivore Interactions Group, Max Planck Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, 07745 Jena, Germany
| | - Marianne Duployer
- Laboratory for Fundamental and Applied Research in Chemical Ecology (FARCE), University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Claudia Zwahlen
- Laboratory for Fundamental and Applied Research in Chemical Ecology (FARCE), University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Gwladys R Doyen
- Laboratory for Fundamental and Applied Research in Chemical Ecology (FARCE), University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
| | - Ted C J Turlings
- Laboratory for Fundamental and Applied Research in Chemical Ecology (FARCE), University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
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Li Y. Confined direct analysis in real time ion source and its applications in analysis of volatile organic compounds of Citrus limon (lemon) and Allium cepa (onion). RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2012; 26:1194-1202. [PMID: 22499194 DOI: 10.1002/rcm.6217] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The DART (direct analysis in real time) ion source is a novel atmospheric pressure ionization technique that enables efficient ionization of gases, liquids and solids with high throughput. A major limit to its wider application in the analysis of gases is its poor detection sensitivity caused by open-air sampling. In this study, a confined interface between the DART ion source outlet and mass spectrometer sampling orifice was developed, where the plasma generated by the atmospheric pressure glow discharge collides and ionizes gas-phase molecules in a Tee-shaped flow tube instead of in open air. It leads to significant increase of collision reaction probability between high energy metastable molecules and analytes. The experimental results show that the ionization efficiency was increased at least by two orders of magnitude. This technique was then applied in the real time analysis of volatile organic compounds (VOCs) of Citrus Limon (lemon) and wounded Allium Cepa (onion). The confined DART ion source was proved to be a powerful tool for the studies of plant metabolomics.
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Affiliation(s)
- Yue Li
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
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