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You S, You M, Niu D. Identification of floral volatiles from Fagopyrum esculentum that attract Cotesia vestalis with potentially better biocontrol efficacy against Plutella xylostella. PEST MANAGEMENT SCIENCE 2024; 80:763-775. [PMID: 37774133 DOI: 10.1002/ps.7808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 09/21/2023] [Accepted: 09/30/2023] [Indexed: 10/01/2023]
Abstract
BACKGROUND Nectar plants provide extra nourishment for parasitoids, which can utilize floral volatiles to locate nectar-rich flowers. A promising strategy is to screen potential floral species based on the wasps' olfactory preferences for nectar sources, and to ensure their suitability for both natural enemies and targeted pests. Cotesia vestalis (Haliday) is a dominant parasitoid of the oligophagous pest Plutella xylostella, which poses a significant threat to cruciferous vegetables globally. However, the chemical cues in plant-parasitoid complexes mediating Cotesia vestalis to locate nectar food resources and the positive effect of nectar plants on the Cotesia vestalis population are poorly understood. RESULTS The results showed that Fagopyrum esculentum was the most attractive plant that attracted Cotesia vestalis, not Plutella xylostella in 44 flowering plants from 19 families. 1,2-Diethyl benzene and 1,4-diethyl benzene, identified from the floral volatiles from F. esculentum in full bloom, were found to elicit dose-dependent electrophysiological responses and attract Cotesia vestalis adults, demonstrating their potential as semiochemicals. Moreover, the age-stage, two-sex life table revealed that feeding on nectar food increased the efficacy of Cotesia vestalis adults against Plutella xylostella. CONCLUSION In summary, the findings provide insights into the chemical ecology of plant-parasitoid complexes and support the potential use of F. esculentum as insectary plants in habitat manipulation against Plutella xylostella by supplying natural nectar food for the Cotesia vestalis population. Our results suggest an attract and reward strategy based on an attractant for Cotesia vestalis to control Plutella xylostella, or the development of volatile-based artificial food for Cotesia vestalis. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Shijun You
- State Key Laboratory for Ecological Pest Control of Fujian and Taiwan Crops, Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou, China
- International Joint Research Laboratory of Ecological Pest Control, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, China
- Ministerial and Provincial Joint Innovation Centre for Safety Production of Cross-Strait Crops, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Integrated Pest Management for Fujian-Taiwan Crops, Ministry of Agriculture and Rural Affairs, Fuzhou, China
- Key Laboratory of Green Control of Insect Pests, Fujian Province University, Fuzhou, China
| | - Minsheng You
- State Key Laboratory for Ecological Pest Control of Fujian and Taiwan Crops, Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou, China
- International Joint Research Laboratory of Ecological Pest Control, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, China
- Ministerial and Provincial Joint Innovation Centre for Safety Production of Cross-Strait Crops, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Integrated Pest Management for Fujian-Taiwan Crops, Ministry of Agriculture and Rural Affairs, Fuzhou, China
- Key Laboratory of Green Control of Insect Pests, Fujian Province University, Fuzhou, China
| | - Dongsheng Niu
- State Key Laboratory for Ecological Pest Control of Fujian and Taiwan Crops, Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou, China
- International Joint Research Laboratory of Ecological Pest Control, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, China
- Ministerial and Provincial Joint Innovation Centre for Safety Production of Cross-Strait Crops, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Integrated Pest Management for Fujian-Taiwan Crops, Ministry of Agriculture and Rural Affairs, Fuzhou, China
- Key Laboratory of Green Control of Insect Pests, Fujian Province University, Fuzhou, China
- Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, China
- Key Laboratory of Biohazard Monitoring and Green Prevention and Control for Artificial Grassland, Ministry of Agriculture and Rural Affairs, Hohhot, China
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Qian J, Liao Y, Jian G, Jia Y, Zeng L, Gu D, Li H, Yang Y. Light induces an increasing release of benzyl nitrile against diurnal herbivore Ectropis grisescens Warren attack in tea (Camellia sinensis) plants. PLANT, CELL & ENVIRONMENT 2023; 46:3464-3480. [PMID: 37553868 DOI: 10.1111/pce.14687] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 07/27/2023] [Accepted: 08/01/2023] [Indexed: 08/10/2023]
Abstract
Herbivore-induced plant volatiles (HIPVs) are critical compounds that directly or indirectly regulate the tritrophic interactions among herbivores, natural enemies and plants. The synthesis and release of HIPVs are regulated by many biotic and abiotic factors. However, the mechanism by which multiple factors synergistically affect HIPVs release remains unclear. Tea plant (Camellia sinensis) is the object of this study because of its rich and varied volatile metabolites. In this study, benzyl nitrile was released from herbivore-attacked tea plants more in the daytime than at night, which was consistent with the feeding behaviour of tea geometrid (Ectropis grisescens Warren) larvae. The Y-tube olfactometer assay and insect resistance analysis revealed that benzyl nitrile can repel tea geometrid larvae and inhibit their growth. On the basis of enzyme activities in transiently transformed Nicotiana benthamiana plants, CsCYP79 was identified as a crucial regulator in the benzyl nitrile biosynthetic pathway. Light signalling-related transcription factor CsPIF1-like and the jasmonic acid (JA) signalling-related transcription factor CsMYC2 serve as the activator of CsCYP79 under light and damage conditions. Our study revealed that light (abiotic factor) and herbivore-induced damage (biotic stress) synergistically regulate the synthesis and release of benzyl nitrile to protect plants from diurnal herbivorous tea geometrid larvae.
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Affiliation(s)
- 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, Guangzhou, China
- South China National Botanical Garden, Guangzhou, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yinyin Liao
- 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, Guangzhou, China
- South China National Botanical Garden, Guangzhou, China
| | - Guotai Jian
- 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, Guangzhou, China
- South China National Botanical Garden, Guangzhou, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yongxia Jia
- 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, Guangzhou, China
- South China National Botanical Garden, Guangzhou, China
| | - 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, Guangzhou, China
- South China National Botanical Garden, Guangzhou, China
- University of Chinese Academy of Sciences, Beijing, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou, China
| | - Dachuan Gu
- 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, Guangzhou, China
- South China National Botanical Garden, Guangzhou, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Hanxiang Li
- 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, Guangzhou, China
- South China National Botanical Garden, Guangzhou, China
| | - Yuhua Yang
- 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, Guangzhou, China
- South China National Botanical Garden, Guangzhou, China
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3
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Malik TG, Sahu LK, Gupta M, Mir BA, Gajbhiye T, Dubey R, Clavijo McCormick A, Pandey SK. Environmental Factors Affecting Monoterpene Emissions from Terrestrial Vegetation. PLANTS (BASEL, SWITZERLAND) 2023; 12:3146. [PMID: 37687392 PMCID: PMC10489858 DOI: 10.3390/plants12173146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/29/2023] [Accepted: 08/30/2023] [Indexed: 09/10/2023]
Abstract
Monoterpenes are volatile organic compounds that play important roles in atmospheric chemistry, plant physiology, communication, and defense. This review compiles the monoterpene emission flux data reported for different regions and plant species and highlights the role of abiotic environmental factors in controlling the emissions of biogenic monoterpenes and their emission fluxes for terrestrial plant species (including seasonal variations). Previous studies have demonstrated the role and importance of ambient air temperature and light in controlling monoterpene emissions, likely contributing to higher monoterpene emissions during the summer season in temperate regions. In addition to light and temperature dependence, other important environmental variables such as carbon dioxide (CO2), ozone (O3), soil moisture, and nutrient availability are also known to influence monoterpene emissions rates, but the information available is still limited. Throughout the paper, we identify knowledge gaps and provide recommendations for future studies.
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Affiliation(s)
- Tanzil Gaffar Malik
- Department of Botany, Guru Ghasidas Central University, Bilaspur 495009, Chhattisgarh, India;
- Space and Atmospheric Sciences Division, Physical Research Laboratory, Ahmedabad 380009, Gujarat, India;
| | - Lokesh Kumar Sahu
- Space and Atmospheric Sciences Division, Physical Research Laboratory, Ahmedabad 380009, Gujarat, India;
| | - Mansi Gupta
- Space and Atmospheric Sciences Division, Physical Research Laboratory, Ahmedabad 380009, Gujarat, India;
| | - Bilal Ahmad Mir
- Department of Botany, University of Kashmir (North Campus), Delina, Baramulla 193103, Jammu & Kashmir, India;
| | - Triratnesh Gajbhiye
- Department of Botany, Govt. Shankar Sao Patel College Waraseoni, Waraseoni 481331, Madhya Pradesh, India;
| | - Rashmi Dubey
- Department of Chemistry, L.B.S. College, Baloda 495559, Chhattisgarh, India;
| | | | - Sudhir Kumar Pandey
- Department of Botany, Guru Ghasidas Central University, Bilaspur 495009, Chhattisgarh, India;
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Effah E, Barrett DP, Peterson PG, Potter MA, Holopainen JK, Clavijo McCormick A. Seasonal Volatile Emission Patterns of the Endemic New Zealand Shrub Dracophyllum subulatum on the North Island Central Plateau. FRONTIERS IN PLANT SCIENCE 2021; 12:734531. [PMID: 34721463 PMCID: PMC8553956 DOI: 10.3389/fpls.2021.734531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 09/27/2021] [Indexed: 06/13/2023]
Abstract
Volatile organic compounds (VOCs) produced by plants are essential indicators of their physiological response to environmental conditions. But evidence of natural variation in VOC emissions and their contributing factors is still limited, especially for non-cultivated species. Here we explored the natural volatile emissions of Dracophyllum subulatum Hook.f., an endemic shrub to the North Island Central Plateau of New Zealand, and determined some environmental factors driving the plant's emissions. Volatile emissions of D. subulatum were measured on four separate occasions from December 2017 to September 2018 using the "push-pull" headspace sampling technique and analyzed using gas chromatography-mass spectrometry (GC-MS). D. subulatum was classified based on the volatiles measured on each sampling occasion using linear discriminant analysis (LDA). On each sampling occasion, we also recorded and compared ambient air temperature, herbivory damage, total soil nitrogen (N), available phosphorus (P), potassium (K), and soil moisture content. The relationship between environmental variables that differed significantly between sampling occasions and volatile emissions were estimated using generalized linear models (GLMs). Based on VOCs measured on each sampling occasion, we were able to distinguish different chemical profiles. Overall, we found that total emission and the relative proportions of all major chemical classes released by D. subulatum were significantly higher during summer. The GLMs reveal that differences in environmental factors between the four sampling occasions are highly associated with changing emissions. Higher temperatures in summer had a consistently strong positive relationship with emissions, while the impacts of soil moisture content, P and K were variable and depended on the chemical class. These results are discussed, particularly how high temperature (warming) may shape volatile emissions and plants' ecology.
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Affiliation(s)
- Evans Effah
- School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
| | - D. Paul Barrett
- School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
| | - Paul G. Peterson
- Manaaki Whenua - Landcare Research, Massey University, Palmerston North, New Zealand
| | - Murray A. Potter
- School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
| | - Jarmo K. Holopainen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland
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Caballero-Vidal G, Bouysset C, Gévar J, Mbouzid H, Nara C, Delaroche J, Golebiowski J, Montagné N, Fiorucci S, Jacquin-Joly E. Reverse chemical ecology in a moth: machine learning on odorant receptors identifies new behaviorally active agonists. Cell Mol Life Sci 2021; 78:6593-6603. [PMID: 34448011 PMCID: PMC8558168 DOI: 10.1007/s00018-021-03919-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 07/23/2021] [Accepted: 08/11/2021] [Indexed: 12/03/2022]
Abstract
The concept of reverse chemical ecology (exploitation of molecular knowledge for chemical ecology) has recently emerged in conservation biology and human health. Here, we extend this concept to crop protection. Targeting odorant receptors from a crop pest insect, the noctuid moth Spodoptera littoralis, we demonstrate that reverse chemical ecology has the potential to accelerate the discovery of novel crop pest insect attractants and repellents. Using machine learning, we first predicted novel natural ligands for two odorant receptors, SlitOR24 and 25. Then, electrophysiological validation proved in silico predictions to be highly sensitive, as 93% and 67% of predicted agonists triggered a response in Drosophila olfactory neurons expressing SlitOR24 and SlitOR25, respectively, despite a lack of specificity. Last, when tested in Y-maze behavioral assays, the most active novel ligands of the receptors were attractive to caterpillars. This work provides a template for rational design of new eco-friendly semiochemicals to manage crop pest populations.
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Affiliation(s)
- Gabriela Caballero-Vidal
- INRAE, Sorbonne Université, CNRS, IRD, UPEC, Université de Paris, Institute of Ecology and Environmental Sciences of Paris, 78000, Versailles, France.,Disease Vector Group, Chemical Ecology Unit, Department of Plant Protection Biology, Swedish University of Agricultural Sciences, Alnarp, Sweden.,Max Planck Centre Next Generation Chemical Ecology, Uppsala, Sweden
| | - Cédric Bouysset
- Université Côte d'Azur, CNRS, Institut de Chimie de Nice UMR7272, 28 avenue Valrose, 06108, Nice, France
| | - Jérémy Gévar
- INRAE, Sorbonne Université, CNRS, IRD, UPEC, Université de Paris, Institute of Ecology and Environmental Sciences of Paris, 78000, Versailles, France
| | - Hayat Mbouzid
- INRAE, Sorbonne Université, CNRS, IRD, UPEC, Université de Paris, Institute of Ecology and Environmental Sciences of Paris, 78000, Versailles, France
| | - Céline Nara
- INRAE, Sorbonne Université, CNRS, IRD, UPEC, Université de Paris, Institute of Ecology and Environmental Sciences of Paris, 78000, Versailles, France
| | - Julie Delaroche
- INRAE, Sorbonne Université, CNRS, IRD, UPEC, Université de Paris, Institute of Ecology and Environmental Sciences of Paris, 78000, Versailles, France
| | - Jérôme Golebiowski
- Université Côte d'Azur, CNRS, Institut de Chimie de Nice UMR7272, 28 avenue Valrose, 06108, Nice, France.,Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, 711-873, South Korea
| | - Nicolas Montagné
- INRAE, Sorbonne Université, CNRS, IRD, UPEC, Université de Paris, Institute of Ecology and Environmental Sciences of Paris, 78000, Versailles, France.
| | - Sébastien Fiorucci
- Université Côte d'Azur, CNRS, Institut de Chimie de Nice UMR7272, 28 avenue Valrose, 06108, Nice, France.
| | - Emmanuelle Jacquin-Joly
- INRAE, Sorbonne Université, CNRS, IRD, UPEC, Université de Paris, Institute of Ecology and Environmental Sciences of Paris, 78000, Versailles, France.
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BVOC Emissions From a Subarctic Ecosystem, as Controlled by Insect Herbivore Pressure and Temperature. Ecosystems 2021. [DOI: 10.1007/s10021-021-00690-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Abstract
The biogenic volatile organic compounds, BVOCs have a central role in ecosystem–atmosphere interactions. High-latitude ecosystems are facing increasing temperatures and insect herbivore pressure, which may affect their BVOC emission rates, but evidence and predictions of changes remain scattered. We studied the long-term effects of + 3 °C warming and reduced insect herbivory (achieved through insecticide sprayings) on mid- and late summer BVOC emissions from field layer vegetation, supplemented with birch saplings, and the underlying soil in Subarctic mountain birch forest in Finland in 2017–2018. Reduced insect herbivory decreased leaf damage by 58–67% and total ecosystem BVOC emissions by 44–72%. Of the BVOC groups, total sesquiterpenes had 70–80% lower emissions with reduced herbivory, and in 2017 the decrease was greater in warmed plots (89% decrease) than in ambient plots (34% decrease). While non-standardized total BVOC, monoterpene, sesquiterpene and GLV emissions showed instant positive responses to increasing chamber air temperature in midsummer samplings, the long-term warming treatment effects on standardized emissions mainly appeared as changes in the compound structure of BVOC blends and varied with compounds and sampling times. Our results suggest that the effects of climate warming on the total quantity of BVOC emissions will in Subarctic ecosystems be, over and above the instant temperature effects, mediated through changes in insect herbivore pressure rather than plant growth. If insect herbivore numbers will increase as predicted under climate warming, our results forecast herbivory-induced increases in the quantity of Subarctic BVOC emissions.
Graphic Abstract
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Eberl F, Fabisch T, Luck K, Köllner TG, Vogel H, Gershenzon J, Unsicker SB. Poplar protease inhibitor expression differs in an herbivore specific manner. BMC PLANT BIOLOGY 2021; 21:170. [PMID: 33836664 PMCID: PMC8033671 DOI: 10.1186/s12870-021-02936-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 03/25/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Protease inhibitors are defense proteins widely distributed in the plant kingdom. By reducing the activity of digestive enzymes in insect guts, they reduce the availability of nutrients and thus impair the growth and development of the attacking herbivore. One well-characterized class of protease inhibitors are Kunitz-type trypsin inhibitors (KTIs), which have been described in various plant species, including Populus spp. Long-lived woody perennials like poplar trees encounter a huge diversity of herbivores, but the specificity of tree defenses towards different herbivore species is hardly studied. We therefore aimed to investigate the induction of KTIs in black poplar (P. nigra) leaves upon herbivory by three different chewing herbivores, Lymantria dispar and Amata mogadorensis caterpillars, and Phratora vulgatissima beetles. RESULTS We identified and generated full-length cDNA sequences of 17 KTIs that are upregulated upon herbivory in black poplar leaves, and analyzed the expression patterns of the eight most up-regulated KTIs via qRT-PCR. We found that beetles elicited higher transcriptional induction of KTIs than caterpillars, and that both caterpillar species induced similar KTI expression levels. Furthermore, KTI expression strongly correlated with the trypsin-inhibiting activity in the herbivore-damaged leaves, but was not dependent on damage severity, i.e. leaf area loss, for most of the genes. CONCLUSIONS We conclude that the induction of KTIs in black poplar is controlled at the transcriptional level in a threshold-based manner and is strongly influenced by the species identity of the herbivore. However, the underlying molecular mechanisms and ecological consequences of these patterns remain to be investigated.
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Affiliation(s)
- Franziska Eberl
- Department of Biochemistry, Max Planck Institute for Chemical Ecology (MPI-CE), Hans-Knöll-Str. 8, 07745 Jena, Germany
| | - Thomas Fabisch
- Department of Biochemistry, Max Planck Institute for Chemical Ecology (MPI-CE), Hans-Knöll-Str. 8, 07745 Jena, Germany
| | - Katrin Luck
- Department of Biochemistry, Max Planck Institute for Chemical Ecology (MPI-CE), Hans-Knöll-Str. 8, 07745 Jena, Germany
| | - Tobias G. Köllner
- Department of Biochemistry, Max Planck Institute for Chemical Ecology (MPI-CE), Hans-Knöll-Str. 8, 07745 Jena, Germany
| | - Heiko Vogel
- Department of Entomology, MPI-CE, Hans-Knöll-Str. 8, 07745 Jena, Germany
| | - Jonathan Gershenzon
- Department of Biochemistry, Max Planck Institute for Chemical Ecology (MPI-CE), Hans-Knöll-Str. 8, 07745 Jena, Germany
| | - Sybille B. Unsicker
- Department of Biochemistry, Max Planck Institute for Chemical Ecology (MPI-CE), Hans-Knöll-Str. 8, 07745 Jena, Germany
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Herbivory and Attenuated UV Radiation Affect Volatile Emissions of the Invasive Weed Calluna vulgaris. Molecules 2020; 25:molecules25143200. [PMID: 32668802 PMCID: PMC7397131 DOI: 10.3390/molecules25143200] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 07/07/2020] [Accepted: 07/08/2020] [Indexed: 11/17/2022] Open
Abstract
Calluna vulgaris (heather) is an aggressive invasive weed on the Central Plateau, North Is., New Zealand (NZ), where it encounters different environmental factors compared to its native range in Europe, such as high ultraviolet radiation (UV) and a lack of specialist herbivores. The specialist herbivore Lochmaea suturalis (heather beetle) was introduced from the United Kingdom (UK) in 1996 as a biocontrol agent to manage this invasive weed. Like other plant invaders, a novel environment may be challenging for heather as it adjusts to its new conditions. This process of “adjustment” involves morphological and physiological changes often linked to phenotypic plasticity. The biochemical responses of exotic plants to environmental variables in their invaded range is poorly understood. The production and release of volatile organic compounds (VOCs) is essential to plant communication and highly susceptible to environmental change. This study therefore aimed to explore the VOC emissions of heather in response to different levels of UV exposure, and to feeding damage by L. suturalis. Using tunnel houses clad with UV-selective filters, we measured VOCs produced by heather under NZ ambient, 20% attenuated, and 95% attenuated solar UV treatments. We also compared VOC emissions in the field at adjacent sites where L. suturalis was present or absent. Volatiles produced by the same target heather plants were measured at four different times in the spring and summer of 2018–2019, reflecting variations in beetle’s abundance, feeding stage and plant phenology. Heather plants under 95% attenuated UV produced significantly higher amounts of (E)-β-farnesene, decanal, benzaldehyde, and benzeneacetaldehyde compared to 25% attenuated and ambient UV radiation. We also found significant differences in volatiles produced by heather plants in beetle-present versus beetle-absent sites on most sampling occasions. We also recorded a lower number of generalist herbivores on heather at sites where L. suturalis was present. Interactions between invasive plants, a novel environment, and the native communities they invade, are discussed.
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9
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Herbivore Gender Effects on Volatile Induction in Aspen and on Olfactory Responses in Leaf Beetles. FORESTS 2020. [DOI: 10.3390/f11060638] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Hybrid aspen (Populus tremula × tremuloides Michx.) is a fast-growing tree species used for short-rotation forestry in northern latitudes. Aspen species have a rich herbivore fauna, including defoliating leaf beetles that induce emissions of volatile organic compounds (VOCs) when feeding on aspen leaves. We investigated the differential induction of VOCs by male and female Phratora laticollis leaf beetles feeding on hybrid aspen and the differences in the orientation of beetles in response to gender-specific induced VOCs. The hypotheses for the study were (1) the VOCs in the headspace of plants infested with beetles of the two genders individually and in mixed aggregates would vary subtly, and (2) foraging adult beetles would be able to detect differences in VOC blends and use them to fine-tune their orientation choices. In Y-tube bioassays, both females and males preferred VOCs from leaves damaged by one gender (females or males) over undamaged leaves. However, if leaves were damaged by a two-gender population, neither females nor males indicated a preference over volatiles of undamaged leaves. Leaves damaged by both beetle genders simultaneously had significantly increased green leaf volatile (GLV), benzenoid and homoterpene emissions compared to undamaged leaves. Emissions of these compounds possibly indicate higher herbivore pressure and a higher risk of attack by parasitoids and predators and could thus be the cause of the lack of beetle preference. Our findings provide new basic information on gender-based host plant selection by herbivores and may be helpful in the development of sustainable biogenic VOC-based herbivore-control methods for intensive short-rotation hybrid aspen production.
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10
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Huang W, Bont Z, Hervé MR, Robert CAM, Erb M. Impact of Seasonal and Temperature-Dependent Variation in Root Defense Metabolites on Herbivore Preference in Taraxacum officinale. J Chem Ecol 2019; 46:63-75. [PMID: 31832894 PMCID: PMC6954900 DOI: 10.1007/s10886-019-01126-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 11/08/2019] [Accepted: 11/18/2019] [Indexed: 12/25/2022]
Abstract
Plants experience seasonal fluctuations in abiotic and biotic factors such as herbivore attack rates. If and how root defense expression co-varies with seasonal fluctuations in abiotic factors and root herbivore attack rates is not well understood. Here, we evaluated seasonal changes in defensive root latex chemistry of Taraxacum officinale plants in the field and correlated the changes with seasonal fluctuations in abiotic factors and damage potential by Melolontha melolontha, a major natural enemy of T. officinale. We then explored the causality and consequences of these relationships under controlled conditions. The concentration of the defensive sesquiterpene lactone taraxinic acid β-D glucopyranosyl ester (TA-G) varied substantially over the year and was most strongly correlated to mean monthly temperature. Both temperature and TA-G levels were correlated with annual fluctuations in potential M. melolontha damage. Under controlled conditions, plants grown under high temperature produced more TA-G and were less attractive for M. melolontha. However, temperature-dependent M. melolontha feeding preferences were not significantly altered in TA-G deficient transgenic lines. Our results suggest that fluctuations in temperature leads to variation in the production of a root defensive metabolites that co-varies with expected attack of a major root herbivore. Temperature-dependent herbivore preference, however, is likely to be modulated by other phenotypic alterations.
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Affiliation(s)
- Wei Huang
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013, Bern, Switzerland. .,CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, Hubei, China.
| | - Zoe Bont
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013, Bern, Switzerland
| | - Maxime R Hervé
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013, Bern, Switzerland.,Inra, Agrocampus Ouest, IGEPP - UMR-A 1349, University of Rennes, F-35000, Rennes, France
| | - Christelle A M Robert
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013, Bern, Switzerland
| | - Matthias Erb
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013, Bern, Switzerland.
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11
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Lackner S, Lackus ND, Paetz C, Köllner TG, Unsicker SB. Aboveground phytochemical responses to belowground herbivory in poplar trees and the consequence for leaf herbivore preference. PLANT, CELL & ENVIRONMENT 2019; 42:3293-3307. [PMID: 31350910 DOI: 10.1111/pce.13628] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 07/16/2019] [Accepted: 07/17/2019] [Indexed: 06/10/2023]
Abstract
Belowground (BG) herbivory can influence aboveground (AG) herbivore performance and food preference via changes in plant chemistry. Most evidence for this phenomenon derives from studies in herbaceous plants but studies in woody plants are scarce. Here we investigated whether and how BG herbivory on black poplar (Populus nigra) trees by Melolontha melolontha larvae influences the feeding preference of Lymantria dispar (gypsy moth) caterpillars. In a food choice assay, caterpillars preferred to feed on leaves from trees that had experienced attack by BG herbivores. Therefore, we investigated the effect of BG herbivory on the phytochemical composition of P. nigra trees alone and in combination with AG feeding by L. dispar caterpillars. BG herbivory did not increase systemic AG tree defences like volatile organic compounds, protease inhibitors and salicinoids. Jasmonates and salicylic acid were also not induced by BG herbivory in leaves but abscisic acid concentrations drastically increased together with proline and few other amino acids. Leaf coating experiments with amino acids suggest that proline might be responsible for the caterpillar feeding preference via presumptive phagostimulatory properties. This study shows that BG herbivory in poplar can modify the feeding preference of AG herbivores via phytochemical changes as a consequence of root-to-shoot signaling.
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Affiliation(s)
- Sandra Lackner
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, 07745, Jena, Germany
| | - Nathalie D Lackus
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, 07745, Jena, Germany
| | - Christian Paetz
- Research Group Biosynthesis/NMR, Max Planck Institute for Chemical Ecology, 07745, Jena, Germany
| | - Tobias G Köllner
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, 07745, Jena, Germany
| | - Sybille B Unsicker
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, 07745, Jena, Germany
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12
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Douma JC, Ganzeveld LN, Unsicker SB, Boeckler GA, Dicke M. What makes a volatile organic compound a reliable indicator of insect herbivory? PLANT, CELL & ENVIRONMENT 2019; 42:3308-3325. [PMID: 31330571 PMCID: PMC6972585 DOI: 10.1111/pce.13624] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 07/16/2019] [Accepted: 07/17/2019] [Indexed: 05/22/2023]
Abstract
Plants that are subject to insect herbivory emit a blend of so-called herbivore-induced plant volatiles (HIPVs), of which only a few serve as cues for the carnivorous enemies to locate their host. We lack understanding which HIPVs are reliable indicators of insect herbivory. Here, we take a modelling approach to elucidate which physicochemical and physiological properties contribute to the information value of a HIPV. A leaf-level HIPV synthesis and emission model is developed and parameterized to poplar. Next, HIPV concentrations within the canopy are inferred as a function of dispersion, transport and chemical degradation of the compounds. We show that the ability of HIPVs to reveal herbivory varies from almost perfect to no better than chance and interacts with canopy conditions. Model predictions matched well with leaf-emission measurements and field and laboratory assays. The chemical class a compound belongs to predicted the signalling ability of a compound only to a minor extent, whereas compound characteristics such as its reaction rate with atmospheric oxidants, biosynthesis rate upon herbivory and volatility were much more important predictors. This study shows the power of merging fields of plant-insect interactions and atmospheric chemistry research to increase our understanding of the ecological significance of HIPVs.
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Affiliation(s)
- Jacob C. Douma
- Centre for Crop Systems Analysis, Department of Plant SciencesWageningen University6708PBWageningenThe Netherlands
- Laboratory of Entomology, Department of Plant SciencesWageningen University6708PBWageningenThe Netherlands
| | - Laurens N. Ganzeveld
- Meteorology and Air Quality, Department of Environmental SciencesWageningen University6708PBWageningenThe Netherlands
| | - Sybille B. Unsicker
- Department of BiochemistryMax Planck Institute for Chemical Ecology07745JenaGermany
| | - G. Andreas Boeckler
- Department of BiochemistryMax Planck Institute for Chemical Ecology07745JenaGermany
| | - Marcel Dicke
- Laboratory of Entomology, Department of Plant SciencesWageningen University6708PBWageningenThe Netherlands
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13
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Günther J, Schmidt A, Gershenzon J, Köllner TG. Phenylacetaldehyde synthase 2 does not contribute to the constitutive formation of 2-phenylethyl-β-D-glucopyranoside in poplar. PLANT SIGNALING & BEHAVIOR 2019; 14:1668233. [PMID: 31532355 PMCID: PMC6804715 DOI: 10.1080/15592324.2019.1668233] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 09/11/2019] [Indexed: 05/29/2023]
Abstract
In response to herbivory, poplar produces among other compounds the volatile alcohol 2-phenylethanol and its corresponding glucoside 2-phenylethyl-β-D-glucopyranoside. While the free alcohol is released only upon herbivory, the glucoside accumulates also in undamaged leaves, but increases after herbivore feeding. Recently we showed that 2-phenylethanol and its glucoside are biosynthesized via separate pathways in Populus trichocarpa. The phenylacetaldehyde synthase PtAAS1 plays a central role in the de novo formation of herbivory-induced volatile 2-phenylethanol, while the phenylalanine decarboxylase PtAADC1 initiates a pathway responsible for the herbivory-induced production of 2-phenylethyl-β-D-glucopyranoside. Besides PtAAS1, P. trichocarpa possesses another aromatic aldehyde synthase PtAAS2 with in vitro enzymatic activity comparable to that of PtAAS1. However, in contrast to PtAAS1, which is exclusively expressed in herbivory-damaged leaves, PtAAS2 was found to be expressed at constant levels in both damaged and undamaged leaves. Thus it has been hypothesized that PtAAS2 provides phenylacetaldehyde as substrate for the constitutive formation of 2-phenylethyl-β-D-glucopyranoside in undamaged P. trichocarpa trees. By generating RNAi-mediated AAS2 knockdown plants, we show here that despite the similar activities of PtAAS1 and PtAAS2 in vitro, the latter enzyme does not contribute to the biosynthesis of 2-phenylethyl-β-D-glucopyranoside in planta. Based on the recent finding that phenylpyruvic acid accumulates in undamaged poplar leaves, the constitutive formation of the glucoside may now be suggested to proceed via the Ehrlich pathway, which begins with the conversion of phenylalanine into phenylpyruvic acid.
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Affiliation(s)
- Jan Günther
- Department for Biochemistry, Max Planck Institute for Chemical Ecology, Jena, Germany
| | - Axel Schmidt
- Department for Biochemistry, Max Planck Institute for Chemical Ecology, Jena, Germany
| | - Jonathan Gershenzon
- Department for Biochemistry, Max Planck Institute for Chemical Ecology, Jena, Germany
| | - Tobias G. Köllner
- Department for Biochemistry, Max Planck Institute for Chemical Ecology, Jena, Germany
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14
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Blubaugh CK, Asplund JS, Eigenbrode SD, Morra MJ, Philips CR, Popova IE, Reganold JP, Snyder WE. Dual-guild herbivory disrupts predator-prey interactions in the field. Ecology 2019; 99:1089-1098. [PMID: 29464698 DOI: 10.1002/ecy.2192] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 01/10/2018] [Accepted: 01/22/2018] [Indexed: 11/11/2022]
Abstract
Plant defenses often mediate whether competing chewing and sucking herbivores indirectly benefit or harm one another. Dual-guild herbivory also can muddle plant signals used by specialist natural enemies to locate prey, further complicating the net impact of herbivore-herbivore interactions in naturally diverse settings. While dual-guild herbivore communities are common in nature, consequences for top-down processes are unclear, as chemically mediated tri-trophic interactions are rarely evaluated in field environments. Combining observational and experimental approaches in the open field, we test a prediction that chewing herbivores interfere with top-down suppression of phloem feeders on Brassica oleracea across broad landscapes. In a two-year survey of 52 working farm sites, we found that parasitoid and aphid densities on broccoli plants positively correlated at farms where aphids and caterpillars rarely co-occurred, but this relationship disappeared at farms where caterpillars commonly co-occurred. In a follow-up experiment, we compared single and dual-guild herbivore communities at four local farm sites and found that caterpillars (P. rapae) caused a 30% reduction in aphid parasitism (primarily by Diaeretiella rapae), and increased aphid colony (Brevicoryne brassicae) growth at some sites. Notably, in the absence of predators, caterpillars indirectly suppressed, rather than enhanced, aphid growth. Amid considerable ecological noise, our study reveals a pattern of apparent commensalism: herbivore-herbivore facilitation via relaxed top-down suppression. This work suggests that enemy-mediated apparent commensalism may override constraints to growth induced by competing herbivores in field environments, and emphasizes the value of placing chemically mediated interactions within their broader environmental and community contexts.
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Affiliation(s)
- Carmen K Blubaugh
- Department of Plant and Environmental Sciences, Clemson University, Clemson, South Carolina, 29678, USA.,Department of Entomology, Washington State University, Pullman, Washington, 99164, USA
| | - Jacob S Asplund
- Department of Entomology, Washington State University, Pullman, Washington, 99164, USA
| | - Sanford D Eigenbrode
- Department of Plant, Soil, and Entomological Sciences, University of Idaho, 875 Perimeter Drive, Moscow, Idaho, 83844, USA
| | - Matthew J Morra
- Department of Plant, Soil, and Entomological Sciences, University of Idaho, 875 Perimeter Drive, Moscow, Idaho, 83844, USA
| | - Christopher R Philips
- Department of Entomology, Washington State University, Pullman, Washington, 99164, USA
| | - Inna E Popova
- Department of Plant, Soil, and Entomological Sciences, University of Idaho, 875 Perimeter Drive, Moscow, Idaho, 83844, USA
| | - John P Reganold
- Department of Crop and Soil Sciences, Washington State University, Pullman, Washington, 99164, USA
| | - William E Snyder
- Department of Entomology, Washington State University, Pullman, Washington, 99164, USA
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15
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Wilkinson SW, Magerøy MH, López Sánchez A, Smith LM, Furci L, Cotton TEA, Krokene P, Ton J. Surviving in a Hostile World: Plant Strategies to Resist Pests and Diseases. ANNUAL REVIEW OF PHYTOPATHOLOGY 2019; 57:505-529. [PMID: 31470772 DOI: 10.1146/annurev-phyto-082718-095959] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
As primary producers, plants are under constant pressure to defend themselves against potentially deadly pathogens and herbivores. In this review, we describe short- and long-term strategies that enable plants to cope with these stresses. Apart from internal immunological strategies that involve physiological and (epi)genetic modifications at the cellular level, plants also employ external strategies that rely on recruitment of beneficial organisms. We discuss these strategies along a gradient of increasing timescales, ranging from rapid immune responses that are initiated within seconds to (epi)genetic adaptations that occur over multiple plant generations. We cover the latest insights into the mechanistic and evolutionary underpinnings of these strategies and present explanatory models. Finally, we discuss how knowledge from short-lived model species can be translated to economically and ecologically important perennials to exploit adaptive plant strategies and mitigate future impacts of pests and diseases in an increasingly interconnected and changing world.
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Affiliation(s)
- Samuel W Wilkinson
- Plant Production and Protection Institute and Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom;
- Department of Molecular Plant Biology, Division for Biotechnology and Plant Health, Norwegian Institute for Bioeconomy Research, 1431 Ås, Norway
| | - Melissa H Magerøy
- Department of Molecular Plant Biology, Division for Biotechnology and Plant Health, Norwegian Institute for Bioeconomy Research, 1431 Ås, Norway
| | - Ana López Sánchez
- Plant Production and Protection Institute and Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom;
- Departamento de Genética Molecular de Plantas, Centro Nacional de Biotecnología, Campus de Cantoblanco, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Lisa M Smith
- Plant Production and Protection Institute and Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom;
| | - Leonardo Furci
- Plant Production and Protection Institute and Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom;
| | - T E Anne Cotton
- Plant Production and Protection Institute and Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom;
| | - Paal Krokene
- Department of Molecular Plant Biology, Division for Biotechnology and Plant Health, Norwegian Institute for Bioeconomy Research, 1431 Ås, Norway
| | - Jurriaan Ton
- Plant Production and Protection Institute and Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom;
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16
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Günther J, Lackus ND, Schmidt A, Huber M, Stödtler HJ, Reichelt M, Gershenzon J, Köllner TG. Separate Pathways Contribute to the Herbivore-Induced Formation of 2-Phenylethanol in Poplar. PLANT PHYSIOLOGY 2019; 180:767-782. [PMID: 30846485 PMCID: PMC6548255 DOI: 10.1104/pp.19.00059] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 02/26/2019] [Indexed: 05/23/2023]
Abstract
Upon herbivory, the tree species western balsam poplar (Populus trichocarpa) produces a variety of Phe-derived metabolites, including 2-phenylethylamine, 2-phenylethanol, and 2-phenylethyl-β-d-glucopyranoside. To investigate the formation of these potential defense compounds, we functionally characterized aromatic l-amino acid decarboxylases (AADCs) and aromatic aldehyde synthases (AASs), which play important roles in the biosynthesis of specialized aromatic metabolites in other plants. Heterologous expression in Escherichia coli and Nicotiana benthamiana showed that all five AADC/AAS genes identified in the P trichocarpa genome encode active enzymes. However, only two genes, PtAADC1 and PtAAS1, were significantly upregulated after leaf herbivory. Despite a sequence similarity of ∼96%, PtAADC1 and PtAAS1 showed different enzymatic functions and converted Phe into 2-phenylethylamine and 2-phenylacetaldehyde, respectively. The activities of both enzymes were interconvertible by switching a single amino acid residue in their active sites. A survey of putative AADC/AAS gene pairs in the genomes of other plants suggests an independent evolution of this function-determining residue in different plant families. RNA interference -mediated-downregulation of AADC1 in gray poplar (Populus × canescens) resulted in decreased accumulation of 2-phenylethylamine and 2-phenylethyl-β-d-glucopyranoside, whereas the emission of 2-phenylethanol was not influenced. To investigate the last step of 2-phenylethanol formation, we identified and characterized two P trichocarpa short-chain dehydrogenases, PtPAR1 and PtPAR2, which were able to reduce 2-phenylacetaldehyde to 2-phenylethanol in vitro. In summary, 2-phenylethanol and its glucoside may be formed in multiple ways in poplar. Our data indicate that PtAADC1 controls the herbivore-induced formation of 2-phenylethylamine and 2-phenylethyl-β-d-glucopyranoside in planta, whereas PtAAS1 likely contributes to the herbivore-induced emission of 2-phenylethanol.
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Affiliation(s)
- Jan Günther
- Max Planck Institute for Chemical Ecology, D-07745 Jena, Germany
| | | | - Axel Schmidt
- Max Planck Institute for Chemical Ecology, D-07745 Jena, Germany
| | - Meret Huber
- Max Planck Institute for Chemical Ecology, D-07745 Jena, Germany
| | | | - Michael Reichelt
- Max Planck Institute for Chemical Ecology, D-07745 Jena, Germany
| | | | - Tobias G Köllner
- Max Planck Institute for Chemical Ecology, D-07745 Jena, Germany
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17
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Fabisch T, Gershenzon J, Unsicker SB. Specificity of Herbivore Defense Responses in a Woody Plant, Black Poplar (Populus nigra). J Chem Ecol 2019; 45:162-177. [PMID: 30788656 PMCID: PMC6469625 DOI: 10.1007/s10886-019-01050-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 01/08/2019] [Accepted: 01/21/2019] [Indexed: 11/25/2022]
Abstract
The specificity of woody plant defense responses to different attacking herbivores is poorly known. We investigated the responses of black poplar (Populus nigra) to leaf feeding by three lepidopteran species (Lymantria dispar, Laothoe populi and Amata mogadorensis) and two leaf beetle species (Phratora vulgatissima and Chrysomela populi). Of the direct defenses monitored, increases in trypsin protease inhibitor activity and the salicinoid salicin were triggered by herbivore damage, but this was not herbivore-specific. Moreover, the majority of leaf salicinoid content was present constitutively and not induced by herbivory. On the other hand, volatile emission profiles did vary among herbivore species, especially between coleopterans and lepidopterans. Monoterpenes and sesquiterpenes were induced in damaged and adjacent undamaged leaves, while the emission of green leaf volatiles, aromatic and nitrogen-containing compounds (known to attract herbivore enemies) was restricted to damaged leaves. In conclusion, indirect defenses appear to show more specific responses to attacking herbivores than direct defenses in this woody plant.
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Affiliation(s)
- Thomas Fabisch
- Max-Planck-Institute for Chemical Ecology, Hans-Knöll-Strasse 8, 07745, Jena, Germany
| | - Jonathan Gershenzon
- Max-Planck-Institute for Chemical Ecology, Hans-Knöll-Strasse 8, 07745, Jena, Germany
| | - Sybille B Unsicker
- Max-Planck-Institute for Chemical Ecology, Hans-Knöll-Strasse 8, 07745, Jena, Germany.
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18
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Ye J, Jiang Y, Veromann-Jürgenson LL, Niinemets Ü. Petiole gall aphid ( Pemphigus spyrothecae) infestation of Populus × petrovskiana leaves alters foliage photosynthetic characteristics and leads to enhanced emissions of both constitutive and stress-induced volatiles. TREES (BERLIN, GERMANY : WEST) 2019; 33:37-51. [PMID: 31700201 PMCID: PMC6837882 DOI: 10.1007/s00468-018-1756-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Poplar spiral gall aphid (Pemphigus spyrothecae) forms galls on the petiole in poplars (Populus) and mass infestations are frequent in poplar stands, but how these parasite gall infestations can affect the leaf lamina structure, photosynthetic rate and constitutive and stress volatile emissions is unknown. We investigated how the infestation by the petiole gall aphids affects lamina photosynthetic characteristics (net assimilation rate, stomatal conductance), C and N contents, and constitutive isoprene and induced volatile emissions in Populus × petrovskiana. The dry gall mass per leaf dry mass (M g/M l) was used as a quantitative measure of the severity of gall infestation. Very high fraction of leaf biomass was invested in gall formation with M g/M l varying between 0.5-2. Over the whole range of the infestation severities, net assimilation rate per area, leaf dry mass per unit area and N content decreased with increasing the severity of infestation. In contrast, stomatal conductance, leaf dry mass per fresh mass, constitutive isoprene emissions, and induced green leaf volatile (GLV), monoterpene, sesquiterpene and benzenoid emissions increased with increasing the severity of gall infestation. The rates of induced emissions were low and these emissions were associated with methyl jasmonate release from leaf laminas. The data demonstrate that petiole gall infestations lead to major changes in leaf lamina sink-source relationships and leaf water relations, thereby significantly altering lamina photosynthesis. Modifications in stress-induced emissions likely indicated systemic signaling triggered by jasmonate transported from the petiole galls to the lamina where jasmonate elicited a cascade of volatile emission responses. Enhance isoprene emissions and induced volatile emissions can play a major role in indirect defense against other herbivores, securing the food source for the gall aphids. In conclusion, a massive infestation by petiole gall aphids can profoundly modify the foliage photosynthetic performance and volatile emission profiles in poplars.
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Affiliation(s)
- Jiayan Ye
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
| | - Yifan Jiang
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
- Corresponding author,
| | - Linda-Liisa Veromann-Jürgenson
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
| | - Ülo Niinemets
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
- Estonian Academy of Sciences, Kohtu 6, 10130 Tallinn, Estonia
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19
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Eberl F, Hammerbacher A, Gershenzon J, Unsicker SB. Leaf rust infection reduces herbivore-induced volatile emission in black poplar and attracts a generalist herbivore. THE NEW PHYTOLOGIST 2018; 220:760-772. [PMID: 28418581 DOI: 10.1111/nph.14565] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 03/02/2017] [Indexed: 05/09/2023]
Abstract
Plants release complex volatile blends after separate attack by herbivores and pathogens, which play many roles in interactions with other organisms. Large perennials are often attacked by multiple enemies, but the effect of combined attacks on volatile emission is rarely studied, particularly in trees. We infested Populus nigra trees with a pathogen, the rust fungus Melampsora larici-populina, and Lymantria dispar caterpillars alone and in combination. We investigated poplar volatile emission and its regulation, as well as the behavior of the caterpillars towards volatiles from rust-infected and uninfected trees. Both the rust fungus and the caterpillars alone induced volatile emission from poplar trees. However, the herbivore-induced volatile emission was significantly reduced when trees were under combined attack by the herbivore and the fungus. Herbivory induced terpene synthase transcripts as well as jasmonate concentrations, but these increases were suppressed when the tree was additionally infected with rust. Caterpillars preferred volatiles from rust-infected over uninfected trees. Our results suggest a defense hormone crosstalk upon combined herbivore-pathogen attack in poplar trees which results in lowered emission of herbivore-induced volatiles. This influences the preference of herbivores, and might have other far-reaching consequences for the insect and pathogen communities in natural poplar forests.
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Affiliation(s)
- Franziska Eberl
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Str. 8, 07745, Jena, Germany
| | - Almuth Hammerbacher
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Str. 8, 07745, Jena, Germany
| | - Jonathan Gershenzon
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Str. 8, 07745, Jena, Germany
| | - Sybille B Unsicker
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Str. 8, 07745, Jena, Germany
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20
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Lämke JS, Unsicker SB. Phytochemical variation in treetops: causes and consequences for tree-insect herbivore interactions. Oecologia 2018; 187:377-388. [PMID: 29473116 PMCID: PMC5997108 DOI: 10.1007/s00442-018-4087-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 02/06/2018] [Indexed: 11/27/2022]
Abstract
The interaction of plants and their herbivorous opponents has shaped the evolution of an intricate network of defences and counter-defences for millions of years. The result is an astounding diversity of phytochemicals and plant strategies to fight and survive. Trees are specifically challenged to resist the plethora of abiotic and biotic stresses due to their dimension and longevity. Here, we review the recent literature on the consequences of phytochemical variation in trees on insect-tree-herbivore interactions. We discuss the importance of genotypic and phenotypic variation in tree defence against insects and suggest some molecular mechanisms that might bring about phytochemical diversity in crowns of individual trees.
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Affiliation(s)
- Jörn S Lämke
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany
| | - Sybille B Unsicker
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll Str. 8, 07745, Jena, Germany.
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21
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Douma JC, Vermeulen PJ, Poelman EH, Dicke M, Anten NPR. When does it pay off to prime for defense? A modeling analysis. THE NEW PHYTOLOGIST 2017; 216:782-797. [PMID: 28892162 PMCID: PMC5659137 DOI: 10.1111/nph.14771] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 07/30/2017] [Indexed: 05/19/2023]
Abstract
Plants can prepare for future herbivore attack through a process called priming. Primed plants respond more strongly and/or faster to insect attack succeeding the priming event than nonprimed plants, while the energetic costs of priming are relatively low. To better understand the evolution of priming, we developed a simulation model, partly parameterized for Brassica nigra plants, to explore how the fitness benefits of priming change when plants are grown in different biotic environments. Model simulations showed that herbivore dynamics (arrival probability, arrival time, and feeding rate) affect the optimal duration, the optimal investment and the fitness benefits of priming. Competition for light increases the indirect costs of priming, but may also result in a larger payoff when the nonprimed plant experiences substantial leaf losses. This modeling approach identified some important knowledge gaps: herbivore arrival rates on individual plants are rarely reported but they shape the optimal duration of priming, and it would pay off if the likelihood, severity and timing of the attack could be discerned from the priming cue, but it is unknown if plants can do so. In addition, the model generated some testable predictions, for example that the sensitivity to the priming cue decreases with plant age.
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Affiliation(s)
- Jacob C. Douma
- Centre for Crop Systems AnalysisWageningen UniversityDroevendaalsesteeg 16708PBWageningenthe Netherlands
- Laboratory of EntomologyWageningen UniversityDroevendaalsesteeg 16708PBWageningenthe Netherlands
| | - Peter J. Vermeulen
- Centre for Crop Systems AnalysisWageningen UniversityDroevendaalsesteeg 16708PBWageningenthe Netherlands
| | - Erik H. Poelman
- Laboratory of EntomologyWageningen UniversityDroevendaalsesteeg 16708PBWageningenthe Netherlands
| | - Marcel Dicke
- Laboratory of EntomologyWageningen UniversityDroevendaalsesteeg 16708PBWageningenthe Netherlands
| | - Niels P. R. Anten
- Centre for Crop Systems AnalysisWageningen UniversityDroevendaalsesteeg 16708PBWageningenthe Netherlands
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22
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Giacomuzzi V, Cappellin L, Nones S, Khomenko I, Biasioli F, Knight AL, Angeli S. Diel rhythms in the volatile emission of apple and grape foliage. PHYTOCHEMISTRY 2017; 138:104-115. [PMID: 28291597 DOI: 10.1016/j.phytochem.2017.03.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 02/28/2017] [Accepted: 03/04/2017] [Indexed: 05/09/2023]
Abstract
This study investigated the diel emission of volatile organic compounds (VOCs) from intact apple (Malus x domestica Borkh., cv. Golden Delicious) and grape (Vitis vinifera L., cv. Pinot Noir) foliage. Volatiles were monitored continuously for 48 h by proton transfer reaction - time of flight - mass spectrometry (PTR-ToF-MS). In addition, volatiles were collected by closed-loop-stripping-analysis (CLSA) and characterized by gas chromatography-mass spectrometry (GC-MS) after 1 h and again 24 and 48 h later. Fourteen and ten volatiles were characterized by GC-MS in apple and grape, respectively. The majority of these were terpenes, followed by green leaf volatiles, and aromatic compounds. The PTR-ToF-MS identified 10 additional compounds and established their diel emission rhythms. The most abundant volatiles displaying a diel rhythm included methanol and dimethyl sulfide in both plants, acetone in grape, and mono-, homo- and sesquiterpenes in apple. The majority of volatiles were released from both plants during the photophase; whereas methanol, CO2, methyl-butenol and benzeneacetaldehyde were released at significantly higher levels during the scotophase. Acetaldehyde, ethanol, and some green leaf volatiles showed distinct emission bursts in both plants following the daily light switch-off. These new results obtained with a combined analytical approach broaden our understanding of the rhythms of constitutive volatile release from two important horticultural crops. In particular, diel emission of sulfur and nitrogen-containing volatiles are reported here for the first time in these two crops.
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Affiliation(s)
- Valentino Giacomuzzi
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - Luca Cappellin
- Research and Innovation Centre, Fondazione Edmund Mach (FEM), Via E. Mach 1, 38010 San Michele all'Adige, Italy; School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, 02138 Cambridge, Massachusetts, USA
| | - Stefano Nones
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - Iuliia Khomenko
- Research and Innovation Centre, Fondazione Edmund Mach (FEM), Via E. Mach 1, 38010 San Michele all'Adige, Italy
| | - Franco Biasioli
- Research and Innovation Centre, Fondazione Edmund Mach (FEM), Via E. Mach 1, 38010 San Michele all'Adige, Italy
| | - Alan L Knight
- USDA, Agricultural Research Service, 5230 Konnowac Pass Rd, 98951 Wapato, Washington, USA
| | - Sergio Angeli
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy.
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Maag D, Köhler A, Robert CAM, Frey M, Wolfender JL, Turlings TCJ, Glauser G, Erb M. Highly localized and persistent induction of Bx1-dependent herbivore resistance factors in maize. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2016; 88:976-991. [PMID: 27538820 DOI: 10.1111/tpj.13308] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 08/11/2016] [Accepted: 08/15/2016] [Indexed: 05/23/2023]
Abstract
The induced production of secondary metabolites in herbivore-attacked plants varies in space and time. However, the consequences of these spatiotemporal patterns for herbivore performance are not well understood. This is particularly true for 1,4-benzoxazin-3-ones (BXs), the major induced defensive metabolites of maize. Here we report on the spatiotemporal dynamics of BX induction and its consequences for the leaf feeder Spodoptera littoralis. Defence-related phytohormones and transcript levels of BX biosynthetic genes were upregulated locally at the wound site within 12 h of herbivory. Within another 12 h, the insecticidal BX HDMBOA-Glc started to accumulate in a highly localized manner at the feeding site. Changes in BX metabolism away from the feeding site within the same leaf were much weaker and were undetected in systemic leaves. Following the removal of the caterpillars, local HDMBOA-Glc levels remained elevated for 7 days. Caterpillars that were forced to feed directly on locally induced leaf parts, but not on adjacent leaf parts, suffered from reduced growth. This effect was abolished in the BX-deficient bx1 mutant. We did not find any evidence that BXs regulate defensive phytohormones or their own accumulation. In summary, this study shows that induced herbivore resistance in maize is highly localized and dependent on BXs.
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Affiliation(s)
- Daniel Maag
- Laboratory of Fundamental and Applied Research in Chemical Ecology, University of Neuchâtel, Rue Emile-Argand 11, 2000, Neuchâtel, Switzerland
- Laboratory of Phytochemistry and Bioactive Natural Products, School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Quai Ernest-Ansermet 30, 1211, Geneva, Switzerland
| | - Angela Köhler
- Laboratory of Fundamental and Applied Research in Chemical Ecology, University of Neuchâtel, Rue Emile-Argand 11, 2000, Neuchâtel, Switzerland
| | - Christelle A M Robert
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013, Bern, Switzerland
| | - Monika Frey
- Lehrstuhl für Genetik, Technische Universität München, Am Hochanger 8, 85350, München, Germany
| | - Jean-Luc Wolfender
- Laboratory of Phytochemistry and Bioactive Natural Products, School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Quai Ernest-Ansermet 30, 1211, Geneva, Switzerland
| | - Ted C J Turlings
- Laboratory of Fundamental and Applied Research in Chemical Ecology, University of Neuchâtel, Rue Emile-Argand 11, 2000, Neuchâtel, Switzerland
| | - Gaétan Glauser
- Laboratory of Fundamental and Applied Research in Chemical Ecology, University of Neuchâtel, Rue Emile-Argand 11, 2000, Neuchâtel, Switzerland
- Neuchâtel Platform of Analytical Chemistry, University of Neuchâtel, Avenue de Bellevaux 51, 2000, Neuchâtel, Switzerland
| | - Matthias Erb
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013, Bern, Switzerland
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Clavijo McCormick A. Can plant-natural enemy communication withstand disruption by biotic and abiotic factors? Ecol Evol 2016; 6:8569-8582. [PMID: 28031808 PMCID: PMC5167045 DOI: 10.1002/ece3.2567] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 09/29/2016] [Accepted: 10/01/2016] [Indexed: 12/24/2022] Open
Abstract
The attraction of natural enemies towards herbivore-induced plant volatiles is a well-documented phenomenon. However, the majority of published studies are carried under optimal water and nutrient regimes and with just one herbivore. But what happens when additional levels of ecological complexity are added? Does the presence of a second herbivore, microorganisms, and abiotic stress interfere with plant-natural enemy communication? or is communication stable enough to withstand disruption by additional biotic and abiotic factors?Investigating the effects of these additional levels of ecological complexity is key to understanding the stability of tritrophic interactions in natural ecosystems and may aid to forecast the impact of environmental disturbances on these, especially in climate change scenarios, which are often associated with modifications in plant and arthropod species distribution and increased levels of abiotic stress.This review explores the literature on natural enemy attraction to herbivore-induced volatiles when, besides herbivory, plants are challenged by additional biotic and abiotic factors.The aim of this review was to establish the impact of different biotic and abiotic factors on plant-natural enemy communication and to highlight critical aspects to guide future research efforts.
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25
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Giacomuzzi V, Cappellin L, Khomenko I, Biasioli F, Schütz S, Tasin M, Knight AL, Angeli S. Emission of Volatile Compounds from Apple Plants Infested with Pandemis heparana Larvae, Antennal Response of Conspecific Adults, and Preliminary Field Trial. J Chem Ecol 2016; 42:1265-1280. [PMID: 27896554 DOI: 10.1007/s10886-016-0794-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 10/24/2016] [Accepted: 10/26/2016] [Indexed: 11/25/2022]
Abstract
This study investigated the volatile emission from apple (Malus x domestica Borkh., cv. Golden Delicious) foliage that was either intact, mechanically-damaged, or exposed to larval feeding by Pandemis heparana (Denis and Schiffermüller) (Lepidoptera: Tortricidae). Volatiles were collected by closed-loop-stripping-analysis and characterized by gas chromatography-mass spectrometry in three time periods: after 1 h and again 24 and 48 h later. Volatiles for all treatments also were monitored continuously over a 72-h period by the use of proton transfer reaction - time of flight-mass spectrometry (PTR-ToF-MS). In addition, the volatile samples were analyzed by gas chromatography-electroantennographic detection (GC-EAD) using male and female antennae of P. heparana. Twelve compounds were detected from intact foliage compared with 23 from mechanically-damaged, and 30 from P. heparana-infested foliage. Interestingly, six compounds were released only by P. heparana-infested foliage. The emission dynamics of many compounds measured by PTR-ToF-MS showed striking differences according to the timing of herbivory and the circadian cycle. For example, the emission of green leaf volatiles began shortly after the start of herbivory, and increased over time independently from the light-dark cycle. Conversely, the emission of terpenes and aromatic compounds showed a several-hour delay in response to herbivory, and followed a diurnal rhythm. Methanol was the only identified volatile showing a nocturnal rhythm. Consistent GC-EAD responses were found for sixteen compounds, including five aromatic ones. A field trial in Sweden demonstrated that benzyl alcohol, 2-phenylethanol, phenylacetonitrile, and indole lures placed in traps were not attractive to Pandemis spp. adults, but 2-phenylethanol and phenylacetonitrile when used in combination with acetic acid were attractive to both sexes.
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Affiliation(s)
- Valentino Giacomuzzi
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100, Bolzano, Italy
| | - Luca Cappellin
- Research and Innovation Centre, Fondazione Edmund Mach (FEM), Via E. Mach 1, 38010, San Michele all'Adige, Italy
- School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge,, MA, 02138, USA
| | - Iuliia Khomenko
- Research and Innovation Centre, Fondazione Edmund Mach (FEM), Via E. Mach 1, 38010, San Michele all'Adige, Italy
| | - Franco Biasioli
- Research and Innovation Centre, Fondazione Edmund Mach (FEM), Via E. Mach 1, 38010, San Michele all'Adige, Italy
| | - Stefan Schütz
- Büsgen-Institute, Department of Forest Zoology and Forest Conservation, University of Göttingen, Büsgenweg 3, 37077, Göttingen, Germany
| | - Marco Tasin
- Department of Plant Protection Biology, Unit of Integrated Plant Protection, Swedish University of Agricultural Science, Växtskyddsvägen 3, 230 53, Alnarp, Sweden
| | - Alan L Knight
- USDA, Agricultural Research Service, 5230 Konnowac Pass Rd, Wapato, WA, 98951, USA.
| | - Sergio Angeli
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100, Bolzano, Italy
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26
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McNutt DW, Underwood N. Variation in plant‐mediated intra‐ and interspecific interactions among insect herbivores: effects of host genotype. Ecosphere 2016. [DOI: 10.1002/ecs2.1520] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Affiliation(s)
- David W. McNutt
- Department of Biological Science Florida State University Tallahassee Florida 32306 USA
| | - Nora Underwood
- Department of Biological Science Florida State University Tallahassee Florida 32306 USA
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27
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Jiang Y, Ye J, Veromann LL, Niinemets Ü. Scaling of photosynthesis and constitutive and induced volatile emissions with severity of leaf infection by rust fungus (Melampsora larici-populina) in Populus balsamifera var. suaveolens. TREE PHYSIOLOGY 2016; 36:856-72. [PMID: 27225874 DOI: 10.1093/treephys/tpw035] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 03/30/2016] [Indexed: 05/22/2023]
Abstract
Fungal infections result in decreases in photosynthesis, induction of stress and signaling volatile emissions and reductions in constitutive volatile emissions, but the way different physiological processes scale with the severity of infection is poorly known. We studied the effects of infection by the obligate biotrophic fungal pathogen Melampsora larici-populina Kleb., the causal agent of poplar leaf rust disease, on photosynthetic characteristics, and constitutive isoprene and induced volatile emissions in leaves of Populus balsamifera var. suaveolens (Fisch.) Loudon. exhibiting different degrees of damage. The degree of fungal damage, quantified by the total area of chlorotic and necrotic leaf areas, varied between 0 (noninfected control) and ∼60%. The rates of all physiological processes scaled quantitatively with the degree of visual damage, but the scaling with damage severity was weaker for photosynthetic characteristics than for constitutive and induced volatile release. Over the whole range of damage severity, the net assimilation rate per area (AA) decreased 1.5-fold, dry mass per unit area 2.4-fold and constitutive isoprene emissions 5-fold, while stomatal conductance increased 1.9-fold and dark respiration rate 1.6-fold. The emissions of key stress and signaling volatiles (methanol, green leaf volatiles, monoterpenes, sesquiterpenes and methyl salicylate) were in most cases nondetectable in noninfested leaves, and increased strongly with increasing the spread of infection. The moderate reduction in AA resulted from the loss of photosynthetically active biomass, but the reduction in constitutive isoprene emissions and the increase in induced volatile emissions primarily reflected changes in the activities of corresponding biochemical pathways. Although all physiological alterations in fungal-infected leaves occurred in a stress severity-dependent manner, modifications in primary and secondary metabolic pathways scaled differently due to contrasting operational mechanisms.
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Affiliation(s)
- Yifan Jiang
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia College of Art, Changzhou University, Gehu 1, Changzhou 213164, Jiangsu, China
| | - Jiayan Ye
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
| | - Linda-Liisa Veromann
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
| | - Ülo Niinemets
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia Estonian Academy of Sciences, Kohtu 6, 10130 Tallinn, Estonia
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28
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McCormick AC, Reinecke A, Gershenzon J, Unsicker SB. Feeding Experience Affects the Behavioral Response of Polyphagous Gypsy Moth Caterpillars to Herbivore-induced Poplar Volatiles. J Chem Ecol 2016; 42:382-93. [PMID: 27170157 PMCID: PMC4912982 DOI: 10.1007/s10886-016-0698-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 03/22/2016] [Accepted: 04/28/2016] [Indexed: 11/27/2022]
Abstract
Plant volatiles influence host selection of herbivorous insects. Since volatiles often vary in space and time, herbivores (especially polyphagous ones) may be able to use these compounds as cues to track variation in host plant quality based on their innate abilities and previous experience. We investigated the behavioral response of naïve (fed on artificial diet) and experienced (fed on poplar) gypsy moth (Lymantria dispar) caterpillars, a polyphagous species, towards constitutive and herbivore-induced black poplar (Populus nigra) volatiles at different stages of herbivore attack. In Y-tube olfactometer assays, both naïve and experienced caterpillars were attracted to constitutive volatiles and volatiles released after short-term herbivory (up to 6 hr). Naïve caterpillars also were attracted to volatiles released after longer-term herbivory (24-30 hr), but experienced caterpillars preferred the odor of undamaged foliage. A multivariate statistical analysis comparing the volatile emission of undamaged plants vs. plants after short and longer-term herbivory, suggested various compounds as being responsible for distinguishing between the odors of these plants. Ten compounds were selected for individual testing of caterpillar behavioral responses in a four-arm olfactometer. Naïve caterpillars spent more time in arms containing (Z)-3-hexenol and (Z)-3-hexenyl acetate than in solvent permeated arms, while avoiding benzyl cyanide and salicyl aldehyde. Experienced caterpillars avoided benzyl cyanide and preferred (Z)-3-hexenyl acetate and the homoterpene (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT) over solvent. Only responses to DMNT were significantly different when comparing experienced and naïve caterpillars. The results show that gypsy moth caterpillars display an innate behavioral response towards constitutive and herbivore-induced plant volatiles, but also that larval behavior is plastic and can be modulated by previous feeding experience.
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Affiliation(s)
- Andrea C McCormick
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, 07745, Jena, Germany.
- Institute of Agriculture and Environment, Massey University, Private Bag 11222, 4442, Palmerston North, New Zealand.
| | - Andreas Reinecke
- Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, 07745, Jena, Germany
- Department of Behavioral Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, Eberhard-Gwinner-Str. 7, 82319, Seewiesen, Germany
| | - Jonathan Gershenzon
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, 07745, Jena, Germany
| | - Sybille B Unsicker
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, 07745, Jena, Germany
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29
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Unsicker SB, Gershenzon J, Köllner TG. Beetle feeding induces a different volatile emission pattern from black poplar foliage than caterpillar herbivory. PLANT SIGNALING & BEHAVIOR 2015; 10:e987522. [PMID: 25831045 PMCID: PMC4623510 DOI: 10.4161/15592324.2014.987522] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Herbivore-induced plant volatile emission is often considered to be attacker species-specific, but most experimental evidence comes from short lived herbaceous species. In a recent study we showed that black poplar (Populus nigra) trees emit a complex blend of volatiles from damaged leaves when they are attacked by generalist gypsy moth (Lymantria dispar) caterpillars. Minor nitrogenous volatiles were especially characteristic of this blend. Here we show that attack on P. nigra by a beetle species, Phratora vulgatissima (Coleoptera, Chrysomelidae), led to the emission of the same compounds as already observed after caterpillar herbivory, but with striking quantitative changes in the blend. The consequences for attraction of herbivore enemies are discussed.
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Affiliation(s)
| | - Jonathan Gershenzon
- Department of Biochemistry; Max Planck Institute for Chemical Ecology; Jena, Germany
| | - Tobias G. Köllner
- Department of Biochemistry; Max Planck Institute for Chemical Ecology; Jena, Germany
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