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Jaeger DM, Runyon JB, Richardson BA. Signals of speciation: volatile organic compounds resolve closely related sagebrush taxa, suggesting their importance in evolution. THE NEW PHYTOLOGIST 2016; 211:1393-1401. [PMID: 27112551 DOI: 10.1111/nph.13982] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 03/22/2016] [Indexed: 06/05/2023]
Abstract
Volatile organic compounds (VOCs) play important roles in the environmental adaptation and fitness of plants. Comparison of the qualitative and quantitative differences in VOCs among closely related taxa and assessing the effects of environment on their emissions are important steps to deducing VOC function and evolutionary importance. Headspace VOCs from five taxa of sagebrush (Artemisia, subgenus Tridentatae) growing in two common gardens were collected and analyzed using GC-MS. Of the 74 total VOCs emitted, only 15 were needed to segregate sagebrush taxa using Random Forest analysis with a low error of 4%. All but one of these 15 VOCs showed qualitative differences among taxa. Ordination of results showed strong clustering that reflects taxonomic classification. Random Forest identified five VOCs that classify based on environment (2% error), which do not overlap with the 15 VOCs that segregated taxa. We show that VOCs can discriminate closely related species and subspecies of Artemisia, which are difficult to define using molecular markers or morphology. Thus, it appears that changes in VOCs either lead the way or follow closely behind speciation in this group. Future research should explore the functions of VOCs, which could provide further insights into the evolution of sagebrushes.
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Affiliation(s)
- Deidre M Jaeger
- USDA Forest Service, Rocky Mountain Research Station, 735 N. 500 East, Provo, UT, 84606, USA
| | - Justin B Runyon
- USDA Forest Service, Rocky Mountain Research Station, 1648 S. 7th Avenue, Bozeman, MT, 59717, USA
| | - Bryce A Richardson
- USDA Forest Service, Rocky Mountain Research Station, 735 N. 500 East, Provo, UT, 84606, USA
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Tjiurutue MC, Stevenson PC, Adler LS. Messages from the Other Side: Parasites Receive Damage Cues from their Host Plants. J Chem Ecol 2016; 42:821-828. [PMID: 27539588 DOI: 10.1007/s10886-016-0746-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 05/29/2016] [Accepted: 07/28/2016] [Indexed: 10/21/2022]
Abstract
As sessile organisms, plants rely on their environment for cues indicating imminent herbivory. These cues can originate from tissues on the same plant or from different individuals. Since parasitic plants form vascular connections with their host, parasites have the potential to receive cues from hosts that allow them to adjust defenses against future herbivory. However, the role of plant communication between hosts and parasites for herbivore defense remains poorly investigated. Here, we examined the effects of damage to lupine hosts (Lupinus texensis) on responses of the attached hemiparasite (Castilleja indivisa), and indirectly, on a specialist herbivore of the parasite, buckeyes (Junonia coenia). Lupines produce alkaloids that act as defenses against herbivores that can be taken up by the parasite. We found that damage to lupine host plants by beet armyworm (Spodoptera exigua) significantly increased jasmonic acid (JA) levels in both the lupine host and parasite, suggesting uptake of phytohormones or priming of parasite defenses by using host cues. However, lupine host damage did not induce changes in alkaloid levels in the hosts or parasites. Interestingly, the parasite had substantially higher concentrations of JA and alkaloids compared to lupine host plants. Buckeye herbivores consumed more parasite tissue when attached to damaged compared to undamaged hosts. We hypothesize that increased JA due to lupine host damage induced higher iridoid glycosides in the parasite, which are feeding stimulants for this specialist herbivore. Our results demonstrate that damage to hosts may affect both parasites and associated herbivores, indicating cascading effects of host damage on multiple trophic levels.
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Affiliation(s)
- Muvari Connie Tjiurutue
- Biology Department, University of Massachusetts Amherst, 221 Morrill Science Center South, 611 North Pleasant Street, Amherst, MA, 01003, USA. .,Department of Chemistry & Biochemistry, University of Namibia, 340 Mandume Ndemufayo Avenue, Pionierspark, Windhoek, Namibia.
| | - Philip C Stevenson
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Chatham, Kent, ME4 4TB, UK.,Royal Botanic Gardens, Kew, Richmond, TW9 3AB, UK
| | - Lynn S Adler
- Biology Department, University of Massachusetts Amherst, 221 Morrill Science Center South, 611 North Pleasant Street, Amherst, MA, 01003, USA
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CHEMOTYPIC Variation in Volatiles and Herbivory for Sagebrush. J Chem Ecol 2016; 42:829-840. [DOI: 10.1007/s10886-016-0741-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 07/14/2016] [Accepted: 07/29/2016] [Indexed: 01/31/2023]
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Abstract
The central nervous system (CNS) underlies memory, perception, decision-making, and behavior in numerous organisms. However, neural networks have no monopoly on the signaling functions that implement these remarkable algorithms. It is often forgotten that neurons optimized cellular signaling modes that existed long before the CNS appeared during evolution, and were used by somatic cellular networks to orchestrate physiology, embryonic development, and behavior. Many of the key dynamics that enable information processing can, in fact, be implemented by different biological hardware. This is widely exploited by organisms throughout the tree of life. Here, we review data on memory, learning, and other aspects of cognition in a range of models, including single celled organisms, plants, and tissues in animal bodies. We discuss current knowledge of the molecular mechanisms at work in these systems, and suggest several hypotheses for future investigation. The study of cognitive processes implemented in aneural contexts is a fascinating, highly interdisciplinary topic that has many implications for evolution, cell biology, regenerative medicine, computer science, and synthetic bioengineering.
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Affiliation(s)
- František Baluška
- Department of Plant Cell Biology, IZMB, University of Bonn Bonn, Germany
| | - Michael Levin
- Biology Department, Tufts Center for Regenerative and Developmental Biology, Tufts University Medford, MA, USA
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Šimpraga M, Takabayashi J, Holopainen JK. Language of plants: Where is the word? JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2016; 58:343-9. [PMID: 26563972 DOI: 10.1111/jipb.12447] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 11/06/2015] [Indexed: 05/03/2023]
Abstract
Plants emit biogenic volatile organic compounds (BVOCs) causing transcriptomic, metabolomic and behavioral responses in receiver organisms. Volatiles involved in such responses are often called "plant language". Arthropods having sensitive chemoreceptors can recognize language released by plants. Insect herbivores, pollinators and natural enemies respond to composition of volatiles from plants with specialized receptors responding to different types of compounds. In contrast, the mechanism of how plants "hear" volatiles has remained obscured. In a plant-plant communication, several individually emitted compounds are known to prime defense response in receiver plants with a specific manner according to the chemical structure of each volatile compound. Further, composition and ratio of volatile compounds in the plant-released plume is important in plant-insect and plant-plant interactions mediated by plant volatiles. Studies on volatile-mediated plant-plant signaling indicate that the signaling distances are rather short, usually not longer than one meter. Volatile communication from plants to insects such as pollinators could be across distances of hundreds of meters. As many of the herbivore induced VOCs have rather short atmospheric life times, we suggest that in long-distant communications with plant volatiles, reaction products in the original emitted compounds may have additional information value of the distance to emission source together with the original plant-emitted compounds.
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Affiliation(s)
- Maja Šimpraga
- Botanical Garden, Faculty of Science, Ghent University, Ledeganck 35, B-9000 Ghent, Belgium
- Department of Environmental Science, University of Eastern Finland, P.O. Box 1627 Kuopio, Finland
| | - Junji Takabayashi
- Center for Ecological Research, Kyoto University, 2-509-3 Hirano, Otsu, Shiga 520-2113, Japan
| | - Jarmo K Holopainen
- Department of Environmental Science, University of Eastern Finland, P.O. Box 1627 Kuopio, Finland
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Kessler A. Introduction to a Virtual Special Issue on plant volatiles. THE NEW PHYTOLOGIST 2016; 209:1333-1337. [PMID: 26840247 DOI: 10.1111/nph.13854] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- André Kessler
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA
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58
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Calling in the Dark: The Role of Volatiles for Communication in the Rhizosphere. SIGNALING AND COMMUNICATION IN PLANTS 2016. [DOI: 10.1007/978-3-319-33498-1_8] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Moreira X, Petry WK, Hernández-Cumplido J, Morelon S, Benrey B. Plant defence responses to volatile alert signals are population-specific. OIKOS 2015. [DOI: 10.1111/oik.02891] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Xoaquín Moreira
- Misión Biológica de Galicia (MBG-CSIC); Apdo. 28 ES-36080 Pontevedra Galicia Spain
| | - William K. Petry
- Dept of Ecology and Evolutionary Biology; Univ. of California; Irvine CA 92697-2525 USA
| | - Johnattan Hernández-Cumplido
- Inst. of Biology, Laboratory of Evolutionary Entomology, Univ. of Neuchâtel; Rue Emile-Argand 11 CH-2000 Neuchâtel Switzerland
| | - Stéphanie Morelon
- Inst. of Biology, Laboratory of Evolutionary Entomology, Univ. of Neuchâtel; Rue Emile-Argand 11 CH-2000 Neuchâtel Switzerland
| | - Betty Benrey
- Inst. of Biology, Laboratory of Evolutionary Entomology, Univ. of Neuchâtel; Rue Emile-Argand 11 CH-2000 Neuchâtel Switzerland
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60
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Secondary compounds enhance flammability in a Mediterranean plant. Oecologia 2015; 180:103-10. [PMID: 26416250 DOI: 10.1007/s00442-015-3454-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 09/10/2015] [Indexed: 01/28/2023]
Abstract
Some plant secondary compounds, such as terpenes, are very flammable; however, their role in enhancing plant flammability is poorly understood and often neglected in reviews on plant chemical ecology. This is relevant as there is growing evidence that flammability-enhancing traits are adaptive in fire-prone ecosystems. We analyzed the content of monoterpenes and sesquiterpenes, performed flammability tests and genotyped microsatellite markers, all in the same individuals of Rosmarinus officinalis, to evaluate the link between the content of terpenes, flammability and the genetic similarity among individuals. The results suggest that terpenes enhance flammability in R. officinalis, and that variability in flammability among individuals is likely to have a genetic basis. Overall our results suggest that the capacity to produce and store terpenes can be considered a flammability-enhancing trait and could have an adaptive value in fire-prone ecosystems.
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Raguso RA, Thompson JN, Campbell DR. Improving our chemistry: challenges and opportunities in the interdisciplinary study of floral volatiles. Nat Prod Rep 2015; 32:893-903. [PMID: 25882132 DOI: 10.1039/c4np00159a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The field of chemical ecology was established, in large part, through collaborative studies between biologists and chemists with common interests in the mechanisms that mediate chemical communication in ecological and evolutionary contexts. Pollination is one highly diverse and important category of such interactions, and there is growing evidence that floral volatiles play important roles in mediating pollinator behaviour and its consequences for plant reproductive ecology and evolution. Here we outline next-generation questions emerging in the study of plants and pollinators, and discuss the potential for strengthening collaboration between biologists and chemists in answering such questions.
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Affiliation(s)
- R A Raguso
- Department of Neurobiology and Behavior, Cornell University, 215 Tower Road, Ithaca, 14853, NY, USA.
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62
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Schenkel D, Lemfack MC, Piechulla B, Splivallo R. A meta-analysis approach for assessing the diversity and specificity of belowground root and microbial volatiles. FRONTIERS IN PLANT SCIENCE 2015; 6:707. [PMID: 26442022 PMCID: PMC4568395 DOI: 10.3389/fpls.2015.00707] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 08/24/2015] [Indexed: 05/20/2023]
Abstract
Volatile organic compounds are secondary metabolites emitted by all organisms, especially by plants and microbes. Their role as aboveground signals has been established for decades. Recent evidence suggests that they might have a non-negligible role belowground and might be involved in root-root and root-microbial/pest interactions. Our aim here was to make a comprehensive review of belowground volatile diversity using a meta-analysis approach. At first we synthesized current literature knowledge on plant root volatiles and classified them in terms of chemical diversity. In a second step, relying on the mVOC database of microbial volatiles, we classified volatiles based on their emitters (bacteria vs. fungi) and their specific ecological niche (i.e., rhizosphere, soil). Our results highlight similarities and differences among root and microbial volatiles and also suggest that some might be niche specific. We further explored the possibility that volatiles might be involved in intra- and inter-specific root-root communication and discuss the ecological implications of such scenario. Overall this work synthesizes current knowledge on the belowground volatilome and the potential signaling role of its constituents. It also highlights that the total diversity of belowground volatiles might be orders of magnitude larger that the few hundreds of compounds described to date.
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Affiliation(s)
- Denis Schenkel
- Institute for Molecular Biosciences, Goethe University FrankfurtFrankfurt, Germany
- Integrative Fungal Research ClusterFrankfurt, Germany
| | - Marie C. Lemfack
- Institute for Biological Sciences, University of RostockRostock, Germany
| | - Birgit Piechulla
- Institute for Biological Sciences, University of RostockRostock, Germany
| | - Richard Splivallo
- Institute for Molecular Biosciences, Goethe University FrankfurtFrankfurt, Germany
- Integrative Fungal Research ClusterFrankfurt, Germany
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63
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Calvo P, Baluška F. Conditions for minimal intelligence across eukaryota: a cognitive science perspective. Front Psychol 2015; 6:1329. [PMID: 26388822 PMCID: PMC4558474 DOI: 10.3389/fpsyg.2015.01329] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 08/19/2015] [Indexed: 11/29/2022] Open
Affiliation(s)
- Paco Calvo
- MINT Lab, Department of Philosophy, University of Murcia Murcia, Spain
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64
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Barlow PW. The natural history of consciousness, and the question of whether plants are conscious, in relation to the Hameroff-Penrose quantum-physical 'Orch OR' theory of universal consciousness. Commun Integr Biol 2015; 8:e1041696. [PMID: 26478778 PMCID: PMC4594572 DOI: 10.1080/19420889.2015.1041696] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 03/28/2015] [Accepted: 04/13/2015] [Indexed: 12/23/2022] Open
Affiliation(s)
- Peter W Barlow
- School of Biological Sciences; University of Bristol; Bristol Life Sciences Building; Bristol, UK
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65
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Gish M, De Moraes CM, Mescher MC. Herbivore-induced plant volatiles in natural and agricultural ecosystems: open questions and future prospects. CURRENT OPINION IN INSECT SCIENCE 2015; 9:1-6. [PMID: 32846702 DOI: 10.1016/j.cois.2015.04.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 04/03/2015] [Accepted: 04/09/2015] [Indexed: 05/20/2023]
Abstract
Herbivore-induced plant volatiles (HIPV) have been shown to convey ecologically relevant information to other organisms, including carnivorous and herbivorous arthropods and neighboring plants. However, many questions about the evolutionary and ecological functions of HIPV remain unanswered. In particular, a current lack of information about the ways in which environmental factors-including habitat structure and atmospheric conditions-influence HIPV mediated interactions in real-world settings limits our ability to anticipate the ways in which HIPV-mediated ecological interactions may be altered or disrupted by anthropogenic environmental change, including atmospheric pollution and climate change. Understanding these influences thus has significant implications for the sustainable management of natural and agricultural ecosystems and should be a priority for future research.
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Affiliation(s)
- Moshe Gish
- Department of Entomology, The Pennsylvania State University, University Park, PA, United States
| | - Consuelo M De Moraes
- Department of Environmental Systems Science, ETH Zürich, 8092 Zürich, Switzerland
| | - Mark C Mescher
- Department of Environmental Systems Science, ETH Zürich, 8092 Zürich, Switzerland.
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66
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Shiojiri K, Ishizaki S, Ozawa R, Karban R. Airborne signals of communication in sagebrush: a pharmacological approach. PLANT SIGNALING & BEHAVIOR 2015; 10:e1095416. [PMID: 26418970 PMCID: PMC4854343 DOI: 10.1080/15592324.2015.1095416] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 09/11/2015] [Accepted: 09/11/2015] [Indexed: 05/05/2023]
Abstract
When plants receive volatiles from a damaged plant, the receivers become more resistant to herbivory. This phenomenon has been reported in many plant species and called plant-plant communication. Lab experiments have suggested that several compounds may be functioning as airborne signals. The objective of this study is to identify potential airborne signals used in communication between sagebrush (Artemisia tridentata) individuals in the field. We collected volatiles of one branch from each of 99 sagebrush individual plants. Eighteen different volatiles were detected by GC-MS analysis. Among these, 4 compounds; 1.8-cineol, β-caryophyllene, α-pinene and borneol, were investigated as signals of communication under natural conditions. The branches which received either 1,8-cineol or β-caryophyllene tended to get less damage than controls. These results suggested that 1,8-cineol and β-caryophyllene should be considered further as possible candidates for generalized airborne signals in sagebrush.
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Affiliation(s)
| | - Satomi Ishizaki
- Department of Natural Environmental Science; Niigata University; Niigata, Japan
| | - Rika Ozawa
- Center for Ecological Research; Kyoto University; Kyoto, Japan
| | - Richard Karban
- Department of Entomology; University of California; Davis, CA USA
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67
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Austin AT, Ballaré CL. Plant interactions with other organisms: molecules, ecology and evolution. THE NEW PHYTOLOGIST 2014; 204:257-260. [PMID: 25236166 DOI: 10.1111/nph.13062] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Affiliation(s)
- Amy T Austin
- IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina; IIB-INTECH, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de San Martín, Buenos Aires, Argentina
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68
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Austin AT, Vivanco L, González-Arzac A, Pérez LI. There's no place like home? An exploration of the mechanisms behind plant litter-decomposer affinity in terrestrial ecosystems. THE NEW PHYTOLOGIST 2014; 204:307-314. [PMID: 25103145 DOI: 10.1111/nph.12959] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 06/26/2014] [Indexed: 06/03/2023]
Abstract
Litter decomposition in terrestrial ecosystems is an important first step for carbon and nutrient cycling, as senescent plant material is degraded and consequently incorporated, along with microbial products, into soil organic matter. The identification of litter affinity effects, whereby decomposition is accelerated in its home environment (home-field advantage, HFA), highlights the importance of plant-soil interactions that have consequences for biogeochemical cycling. While not universal, these affinity effects have been identified in a range of ecosystems, particularly in forests without disturbance. The optimization of the local decomposer community to degrade a particular combination of litter traits is the most oft-cited explanation for HFA effects, but the ways in which this specialized community can develop are only beginning to be understood. We explore ways in which HFA, or more broadly litter affinity effects, could arise in terrestrial ecosystems. Plant-herbivore interactions, microbial symbiosis, legacies from phyllosphere communities and attractors of specific soil fauna could contribute to spatially defined affinity effects for litter decomposition. Pyrosequencing soil communities and functional linkages of soil fauna provide great promise in advancing our mechanistic understanding of these interactions, and could lead to a greater appreciation of the role of litter-decomposer affinity in the maintenance of soil functional diversity.
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Affiliation(s)
- Amy T Austin
- Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE, Buenos Aires, Argentina
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