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Dong X, Jiang F, Duan D, Tian Z, Liu H, Zhang Y, Hou F, Nan Z, Chen T. Contrasting Effects of Grazing in Shaping the Seasonal Trajectory of Foliar Fungal Endophyte Communities on Two Semiarid Grassland Species. J Fungi (Basel) 2023; 9:1016. [PMID: 37888272 PMCID: PMC10608051 DOI: 10.3390/jof9101016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/03/2023] [Accepted: 10/10/2023] [Indexed: 10/28/2023] Open
Abstract
Fungal endophytes are harboured in the leaves of every individual plant host and contribute to plant health, leaf senescence, and early decomposition. In grasslands, fungal endophytes and their hosts often coexist with large herbivores. However, the influence of grazing by large herbivores on foliar fungal endophyte communities remains largely unexplored. We conducted a long-term (18 yr) grazing experiment to explore the effects of grazing on the community composition and diversity of the foliar fungal endophytes of two perennial grassland species (i.e., Artemisia capillaris and Stipa bungeana) across one growing season. Grazing significantly increased the mean fungal alpha diversity of A. capillaris in the early season. In contrast, grazing significantly reduced the mean fungal alpha diversity of endophytic fungi of S. bungeana in the late season. Grazing, growing season, and their interactions concurrently structured the community composition of the foliar fungal endophytes of both plant species. However, growing season consistently outperformed grazing and environmental factors in shaping the community composition and diversity of both plant species. Overall, our findings demonstrate that the foliar endophytic fungal community diversity and composition differed in response to grazing between A. capillaris and S. bungeana during one growing season. The focus on this difference will enhance our understanding of grazing's impact on ecological systems and improve land management practices in grazing regions. This variation in the effects of leaf nutrients and plant community characteristics on foliar endophytic fungal community diversity and composition may have a pronounced impact on plant health and plant-fungal interactions.
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Affiliation(s)
- Xin Dong
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Feifei Jiang
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Dongdong Duan
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
- Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station, Institute of Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu 610041, China
| | - Zhen Tian
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Huining Liu
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Yinan Zhang
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Fujiang Hou
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Zhibiao Nan
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Tao Chen
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
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Riehl JFL, Cole CT, Morrow CJ, Barker HL, Bernhardsson C, Rubert‐Nason K, Ingvarsson PK, Lindroth RL. Genomic and transcriptomic analyses reveal polygenic architecture for ecologically important traits in aspen ( Populus tremuloides Michx.). Ecol Evol 2023; 13:e10541. [PMID: 37780087 PMCID: PMC10534199 DOI: 10.1002/ece3.10541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 08/30/2023] [Accepted: 09/04/2023] [Indexed: 10/03/2023] Open
Abstract
Intraspecific genetic variation in foundation species such as aspen (Populus tremuloides Michx.) shapes their impact on forest structure and function. Identifying genes underlying ecologically important traits is key to understanding that impact. Previous studies, using single-locus genome-wide association (GWA) analyses to identify candidate genes, have identified fewer genes than anticipated for highly heritable quantitative traits. Mounting evidence suggests that polygenic control of quantitative traits is largely responsible for this "missing heritability" phenomenon. Our research characterized the genetic architecture of 30 ecologically important traits using a common garden of aspen through genomic and transcriptomic analyses. A multilocus association model revealed that most traits displayed a highly polygenic architecture, with most variation explained by loci with small effects (likely below the detection levels of single-locus GWA methods). Consistent with a polygenic architecture, our single-locus GWA analyses found only 38 significant SNPs in 22 genes across 15 traits. Next, we used differential expression analysis on a subset of aspen genets with divergent concentrations of salicinoid phenolic glycosides (key defense traits). This complementary method to traditional GWA discovered 1243 differentially expressed genes for a polygenic trait. Soft clustering analysis revealed three gene clusters (241 candidate genes) involved in secondary metabolite biosynthesis and regulation. Our work reveals that ecologically important traits governing higher-order community- and ecosystem-level attributes of a foundation forest tree species have complex underlying genetic structures and will require methods beyond traditional GWA analyses to unravel.
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Affiliation(s)
| | | | - Clay J. Morrow
- Department of Forest and Wildlife EcologyUniversity of Wisconsin‐MadisonMadisonWisconsinUSA
| | - Hilary L. Barker
- Department of EntomologyUniversity of Wisconsin‐MadisonMadisonWisconsinUSA
- Present address:
Office of Student SuccessWisconsin Technical College SystemMadisonWisconsinUSA
| | - Carolina Bernhardsson
- Department of Ecology and Environmental ScienceUmeå UniversityUmeåSweden
- Present address:
Department of Organismal Biology, Center for Evolutionary BiologyUppsala UniversityUppsalaSweden
| | - Kennedy Rubert‐Nason
- Department of EntomologyUniversity of Wisconsin‐MadisonMadisonWisconsinUSA
- Present address:
Division of Natural SciencesUniversity of Maine at Fort KentFort KentMaineUSA
| | - Pär K. Ingvarsson
- Department of Plant BiologySwedish University of Agricultural Sciences, Uppsala BioCenterUppsalaSweden
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Lindroth RL, Wooley SC, Donaldson JR, Rubert-Nason KF, Morrow CJ, Mock KE. Phenotypic Variation in Phytochemical Defense of Trembling Aspen in Western North America: Genetics, Development, and Geography. J Chem Ecol 2023; 49:235-250. [PMID: 36765024 DOI: 10.1007/s10886-023-01409-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/01/2023] [Accepted: 02/02/2023] [Indexed: 02/12/2023]
Abstract
Trembling aspen (Populus tremuloides) is arguably the most important deciduous tree species in the Intermountain West of North America. There, as elsewhere in its range, aspen exhibits remarkable genetic variation in observable traits such as morphology and phenology. In contrast to Great Lakes populations, however, relatively little is known about phytochemical variation in western aspen. This survey of phytochemistry in western aspen was undertaken to assess how chemical expression varies among genotypes, cytotypes (diploid vs. triploid), and populations, and in response to development and mammalian browsing. We measured levels of foliar nitrogen, salicinoid phenolic glycosides (SPGs) and condensed tannins (CTs), as those constituents influence organismal interactions and ecosystem processes. Results revealed striking genotypic variation and considerable population variation, but minimal cytotype variation, in phytochemistry of western aspen. Levels of SPGs and nitrogen declined, whereas levels of CTs increased, with tree age. Browsed ramets had much higher levels of SPGs, and lower levels of CTs, than unbrowsed ramets of the same genotype. We then evaluated how composite chemical profiles of western aspen differ from those of Great Lakes aspen (assessed in earlier research). Interestingly, mature western aspen trees maintain much higher levels of SPGs, and lower levels of CTs, than Great Lakes aspen. Phenotypic variation in chemical composition of aspen - a foundation species - in the Intermountain West likely has important consequences for organismal interactions and forest ecosystem dynamics. Moreover, those consequences likely play out over spatial and temporal scales somewhat differently than have been documented for Great Lakes aspen.
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Affiliation(s)
- Richard L Lindroth
- Department of Entomology, University of Wisconsin-Madison, Madison, WI, 53706, USA.
| | - Stuart C Wooley
- Department of Entomology, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Department of Biological Sciences, California State University-Stanislaus, Turlock, CA, 95382, USA
| | - Jack R Donaldson
- Department of Zoology, University of Wisconsin-Madison, Madison, WI, 53706, USA
- , Orem, UT, USA
| | - Kennedy F Rubert-Nason
- Department of Entomology, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Division of Natural Sciences, University of Maine at Fort Kent, Fort Kent, ME, 04743, USA
| | - Clay J Morrow
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Karen E Mock
- Department of Wildland Resources and Ecology Center, Utah State University, Logan, UT, 84322, USA
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Mallick S, Molleman F, Yguel B, Bailey R, Müller J, Jean F, Prinzing A. Ectophagous folivores do not profit from rich resources on phylogenetically isolated trees. Oecologia 2023; 201:1-18. [PMID: 36165922 DOI: 10.1007/s00442-022-05260-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 09/06/2022] [Indexed: 01/07/2023]
Abstract
Resource use by consumers across patches is often proportional to the quantity or quality of the resource within these patches. In folivores, such proportional use of resources is likely to be more efficient when plants are spatially proximate, such as trees forming a forest canopy. However, resources provided by forest-trees are often not used proportionally. We hypothesised that proportional use of resources is reduced when host trees are isolated among phylogenetically distant neighbours that mask olfactory and visual search cues, and reduce folivore movement between trees. Such phylogenetically distant neighbourhoods might sort out species that are specialists, poor dispersers, or have poor access to information about leaf quality. We studied individual oaks, their leaf size and quality, their folivory and abundance of folivores (mostly Lepidopteran ectophages, gallers and miners), and parasitism of folivores. We found that leaf consumption by ectophages hardly increased with increasing leaf size when host trees were phylogenetically isolated. We found a similar effect on host use by parasitoids in 1 year. In contrast, we found no consistent effects in other folivore guilds. Relative abundances of specialists and species with wingless females declined with phylogenetic isolation. However, resource use within each of these groups was inconsistently affected by phylogenetic isolation. We suggest that phylogenetic isolation prevents ectophages from effectively choosing trees with abundant resources, and also sorts out species likely to recruit in situ on their host tree. Trees in phylogenetically distant neighbourhoods may be selected for larger leaves and greater reliance on induced defences.
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Affiliation(s)
- Soumen Mallick
- Centre National de la Recherche Scientifique, Université de Rennes 1, Research Unit UMR 6553, Ecosystèmes Biodiversité Evolution (ECOBIO), Campus de Beaulieu, 35042, Rennes, France.
| | - Freerk Molleman
- Department of Systematic Zoology, Institute of Environmental Biology, Faculty of Biology, A. Mickiewicz University, Ul. Uniwersytetu Poznańskiego 6, 61-614, Poznan, Poland
| | - Benjamin Yguel
- Centre National de la Recherche Scientifique, Université de Rennes 1, Research Unit UMR 6553, Ecosystèmes Biodiversité Evolution (ECOBIO), Campus de Beaulieu, 35042, Rennes, France.,Centre d'Ecologie et des Sciences de la Conservation (CESCO-UMR 7204), Sorbonne Universités-MNHN-CNRS-UPMC, CP51, 55-61rue Buffon, 75005, Paris, France
| | - Richard Bailey
- Centre National de la Recherche Scientifique, Université de Rennes 1, Research Unit UMR 6553, Ecosystèmes Biodiversité Evolution (ECOBIO), Campus de Beaulieu, 35042, Rennes, France.,Department of Ecology and Vertebrate Zoology, Faculty of Biology and Environmental Protection, University of Łódź, Lodz, Poland
| | - Jörg Müller
- Field Station Fabrikschleichach, Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, Glashüttenstraße 5, 96181, Rauhenebrach, Germany.,Bavarian Forest National Park, Freyunger Str. 2, 94481, Grafenau, Germany
| | - Frédéric Jean
- Centre National de la Recherche Scientifique, Université de Rennes 1, Research Unit UMR 6553, Ecosystèmes Biodiversité Evolution (ECOBIO), Campus de Beaulieu, 35042, Rennes, France
| | - Andreas Prinzing
- Centre National de la Recherche Scientifique, Université de Rennes 1, Research Unit UMR 6553, Ecosystèmes Biodiversité Evolution (ECOBIO), Campus de Beaulieu, 35042, Rennes, France
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Rotter MC, Christie K, Holeski LM. Climate and the biotic community structure plant resistance across biogeographic groups of yellow monkeyflower. Ecol Evol 2022; 12:e9520. [DOI: 10.1002/ece3.9520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 10/25/2022] [Accepted: 10/28/2022] [Indexed: 11/24/2022] Open
Affiliation(s)
- Michael C. Rotter
- Department of Biological Sciences Northern Arizona University Flagstaff Arizona USA
- Department of Biology Utah Valley University Orem Utah USA
| | - Kyle Christie
- Department of Biological Sciences Northern Arizona University Flagstaff Arizona USA
- Department of Plant Biology Michigan State University East Lansing Michigan USA
| | - Liza M. Holeski
- Department of Biological Sciences Northern Arizona University Flagstaff Arizona USA
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Castillo-Mendoza E, Zamilpa A, González-Cortazar M, Ble-González EA, Tovar-Sánchez E. Chemical Constituents and Their Production in Mexican Oaks ( Q. Rugosa, Q. Glabrescens and Q. Obtusata). PLANTS (BASEL, SWITZERLAND) 2022; 11:2610. [PMID: 36235477 PMCID: PMC9573139 DOI: 10.3390/plants11192610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 09/28/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
Mexico is considered one of the main regions of diversification of the genus Quercus (oaks). Oak species are one of the most important tree groups, particularly in temperate forests, due to its diversity and abundance. Some studies have shown that oak contains specialized metabolites with medicinal importance. In this work, the acetonic extract from leaves of three Mexican oaks (Quercus rugosa, Q. glabrescens, and Q. obtusata) was separated using thin-layer chromatography and column chromatography. Chemical identification of the major compounds was determined using high-performance liquid chromatography and nuclear magnetic resonance. Nineteen compounds were identified, three belonging to the terpenoid family (ursolic acid, β-amyrin, and β-sitosterol) and 16 from the phenolic family. Of the isolated compounds, seven are new reports for oak species (scopoletin, ursolic acid, β-amyrin, luteolin-7-O-glucoside, kaempferol-3-O-sophoroside, kaempferol-3-O-glucoside, and kaempferol-3-O-sambubioside). More compounds were identified in Q. rugosa followed by Q. glabrescens and then Q. obtusata. The characterization of specialized metabolites in oak species is relevant, from both phytocentric and anthropocentric perspectives.
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Affiliation(s)
- Elgar Castillo-Mendoza
- Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, Cuernavaca 62209, Morelos, Mexico
| | - Alejandro Zamilpa
- Centro de Investigación Biomédica del Sur, Instituto Mexicano del Seguro Social, Argentina No. 1, Col. Centro, Xochitepec 62790, Morelos, Mexico
| | - Manasés González-Cortazar
- Centro de Investigación Biomédica del Sur, Instituto Mexicano del Seguro Social, Argentina No. 1, Col. Centro, Xochitepec 62790, Morelos, Mexico
| | - Ever A. Ble-González
- División Académica de Ciencias Básicas, Universidad Juárez Autónoma de Tabasco, Carretera Cunduacán-Jalpa Km. 0.5, Cunduacán 86690, Tabasco, Mexico
| | - Efraín Tovar-Sánchez
- Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, Cuernavaca 62209, Morelos, Mexico
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Eisenring M, Best RJ, Zierden MR, Cooper HF, Norstrem MA, Whitham TG, Grady K, Allan GJ, Lindroth RL. Genetic divergence along a climate gradient shapes chemical plasticity of a foundation tree species to both changing climate and herbivore damage. GLOBAL CHANGE BIOLOGY 2022; 28:4684-4700. [PMID: 35596651 DOI: 10.1111/gcb.16275] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 04/21/2022] [Indexed: 06/15/2023]
Abstract
Climate change is threatening the persistence of many tree species via independent and interactive effects on abiotic and biotic conditions. In addition, changes in temperature, precipitation, and insect attacks can alter the traits of these trees, disrupting communities and ecosystems. For foundation species such as Populus, phytochemical traits are key mechanisms linking trees with their environment and are likely jointly determined by interactive effects of genetic divergence and variable environments throughout their geographic range. Using reciprocal Fremont cottonwood (Populus fremontii) common gardens along a steep climatic gradient, we explored how environment (garden climate and simulated herbivore damage) and genetics (tree provenance and genotype) affect both foliar chemical traits and the plasticity of these traits. We found that (1) Constitutive and plastic chemical responses to changes in garden climate and damage varied among defense compounds, structural compounds, and leaf nitrogen. (2) For both defense and structural compounds, plastic responses to different garden climates depended on the climate in which a population or genotype originated. Specifically, trees originating from cool provenances showed higher defense plasticity in response to climate changes than trees from warmer provenances. (3) Trees from cool provenances growing in cool garden conditions expressed the lowest constitutive defense levels but the strongest induced (plastic) defenses in response to damage. (4) The combination of hot garden conditions and simulated herbivory switched the strategy used by these genotypes, increasing constitutive defenses but erasing the capacity for induction after damage. Because Fremont cottonwood chemistry plays a major role in shaping riparian communities and ecosystems, the effects of changes in phytochemical traits can be wide reaching. As the southwestern US is confronted with warming temperatures and insect outbreaks, these results improve our capacity to predict ecosystem consequences of climate change and inform selection of tree genotypes for conservation and restoration purposes.
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Affiliation(s)
- Michael Eisenring
- Department of Entomology, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Forest Entomology, Swiss Federal Research Institute for Forest, Snow, and Landscape Research WSL, Zurich, Switzerland
| | - Rebecca J Best
- School of Earth and Sustainability, Northern Arizona University, Flagstaff, Arizona, USA
| | - Mark R Zierden
- Department of Entomology, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Hillary F Cooper
- Center for Adaptable Western Landscapes, Northern Arizona University, Flagstaff, Arizona, USA
| | - Madelyn A Norstrem
- School of Earth and Sustainability, Northern Arizona University, Flagstaff, Arizona, USA
| | - Thomas G Whitham
- Center for Adaptable Western Landscapes, Northern Arizona University, Flagstaff, Arizona, USA
- Department of Biological Sciences, Northern Arizona University, Flagstaff, Arizona, USA
| | - Kevin Grady
- School of Forestry, Northern Arizona University, Flagstaff, Arizona, USA
| | - Gerard J Allan
- Center for Adaptable Western Landscapes, Northern Arizona University, Flagstaff, Arizona, USA
- Department of Biological Sciences, Northern Arizona University, Flagstaff, Arizona, USA
| | - Richard L Lindroth
- Department of Entomology, University of Wisconsin-Madison, Madison, Wisconsin, USA
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Morrow CJ, Jaeger SJ, Lindroth RL. Intraspecific variation in plant economic traits predicts trembling aspen resistance to a generalist insect herbivore. Oecologia 2022; 199:119-128. [PMID: 35449362 DOI: 10.1007/s00442-022-05158-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 03/30/2022] [Indexed: 10/18/2022]
Abstract
Patterns of trait expression within some plant species have recently been shown to align with the leaf economics spectrum paradigm. Resistance to herbivores is also expected to covary with leaf economics traits. We selected 36 mature Populus tremuloides genotypes in a common garden to assess whether aspen leaf economics patterns follow those observed among species globally. We also evaluated leaf economics strategies in the context of insect resistance by conducting bioassays to determine the effects of plant traits on preference and performance of Lymantria dispar. We found that: (1) intraspecific trait patterns of P. tremuloides parallel those exhibited by the interspecific leaf economics spectrum, (2) herbivores preferred leaves from genotypes with resource-acquisitive strategies, and (3) herbivores also performed best on genotypes with resource-acquisitive strategies. We conclude that a leaf economics spectrum that incorporates defense traits is a useful tool for explaining intraspecific patterns of variation in plant strategies, including resistance to herbivores.
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Affiliation(s)
- Clay J Morrow
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 226 Russell Laboratories, 1630 Linden Drive, Madison, WI, 53706, USA.
| | - Samuel J Jaeger
- Department of Entomology, University of Wisconsin-Madison, 237 Russell Laboratories, 1630 Linden Drive, Madison, WI, 53706, USA
- CEMML, Colorado State University, 200 W. Lake ST, 1490 Campus Delivery, Fort Collins, CO, 80523, USA
| | - Richard L Lindroth
- Department of Entomology, University of Wisconsin-Madison, 237 Russell Laboratories, 1630 Linden Drive, Madison, WI, 53706, USA
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What Drives Caterpillar Guilds on a Tree: Enemy Pressure, Leaf or Tree Growth, Genetic Traits, or Phylogenetic Neighbourhood? INSECTS 2022; 13:insects13040367. [PMID: 35447809 PMCID: PMC9029432 DOI: 10.3390/insects13040367] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/25/2022] [Accepted: 03/30/2022] [Indexed: 11/17/2022]
Abstract
Communities of herbivorous insects on individual host trees may be driven by processes ranging from ongoing development via recent microevolution to ancient phylogeny, but the relative importance of these processes and whether they operate via trophic interactions or herbivore movement remains unknown. We determined the leaf phenology, trunk diameter, genotype, and neighbourhood of sessile oak trees (Quercus petraea), and sampled their caterpillar communities. We found that leaf development across a time period of days related to free-living caterpillars, which disappeared with leaf age. Tree growth across decades is related to increased parasitism rate and diversity of herbivores. The microevolution of oak trees across millennia is related to the abundance of leaf-mining casebearers, which is higher on more homozygous oaks. However, oak genome size was not important for any guild. In contrast to most previous studies, the phylogenetic distance of oaks from their neighbours measured in millions of years was associated with higher abundances of entire caterpillar guilds. Furthermore, on trees surrounded by only distantly related tree species, parasitism tended to be lower. Lower parasitism, in turn, was associated with higher abundances of codominant caterpillar species. Neighbourhoods and traits of trees were also related to community composition and diversity, but not to the average wingspans or specialization of species, consistent with the assembly of herbivore communities being driven by leaf traits and parasitism pressure on trees rather than by insect movement among trees. However, movement in rarer species may be responsible for concentration effects in more phylogenetically distant neighbourhoods. Overall, we suggest that the assembly of insects on a tree is mostly driven by trophic interactions controlled by a mosaic of processes playing out over very different time scales. Comparisons with the literature further suggest that, for oak trees, the consequences of growing amongst distantly related tree species may depend on factors such as geographic region and tree age.
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Nguyen VAT, Vural DC. Theoretical guidelines for editing ecological communities. J Theor Biol 2021; 534:110945. [PMID: 34717935 DOI: 10.1016/j.jtbi.2021.110945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 10/21/2021] [Accepted: 10/22/2021] [Indexed: 11/18/2022]
Abstract
Having control over species abundances and community resilience is of great interest for experimental, agricultural, industrial and conservation purposes. Here, we theoretically explore the possibility of manipulating ecological communities by modifying pairwise interactions. Specifically, we establish which interaction values should be modified, and by how much, in order to alter the composition or resilience of a community towards a favorable direction. While doing so, we also take into account the experimental difficulties in making such modifications by including in our optimization process, a cost parameter, which penalizes large modifications. In addition to prescribing what changes should be made to interspecies interactions given some modification cost, our approach also serves to establish the limits of community control, i.e. how well can one approach an ecological goal at best, even when not constrained by cost.
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Affiliation(s)
- Vu A T Nguyen
- University of Notre Dame, South Bend, IN, United States
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11
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Growth-defense trade-offs shape population genetic composition in an iconic forest tree species. Proc Natl Acad Sci U S A 2021; 118:2103162118. [PMID: 34507992 DOI: 10.1073/pnas.2103162118] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/09/2021] [Indexed: 12/30/2022] Open
Abstract
All organisms experience fundamental conflicts between divergent metabolic processes. In plants, a pivotal conflict occurs between allocation to growth, which accelerates resource acquisition, and to defense, which protects existing tissue against herbivory. Trade-offs between growth and defense traits are not universally observed, and a central prediction of plant evolutionary ecology is that context-dependence of these trade-offs contributes to the maintenance of intraspecific variation in defense [Züst and Agrawal, Annu. Rev. Plant Biol., 68, 513-534 (2017)]. This prediction has rarely been tested, however, and the evolutionary consequences of growth-defense trade-offs in different environments are poorly understood, especially in long-lived species [Cipollini et al., Annual Plant Reviews (Wiley, 2014), pp. 263-307]. Here we show that intraspecific trait trade-offs, even when fixed across divergent environments, interact with competition to drive natural selection of tree genotypes corresponding to their growth-defense phenotypes. Our results show that a functional trait trade-off, when coupled with environmental variation, causes real-time divergence in the genetic architecture of tree populations in an experimental setting. Specifically, competitive selection for faster growth resulted in dominance by fast-growing tree genotypes that were poorly defended against natural enemies. This outcome is a signature example of eco-evolutionary dynamics: Competitive interactions affected microevolutionary trajectories on a timescale relevant to subsequent ecological interactions [Brunner et al., Funct. Ecol. 33, 7-12 (2019)]. Eco-evolutionary drivers of tree growth and defense are thus critical to stand-level trait variation, which structures communities and ecosystems over expansive spatiotemporal scales.
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Faticov M, Abdelfattah A, Roslin T, Vacher C, Hambäck P, Blanchet FG, Lindahl BD, Tack AJM. Climate warming dominates over plant genotype in shaping the seasonal trajectory of foliar fungal communities on oak. THE NEW PHYTOLOGIST 2021; 231:1770-1783. [PMID: 33960441 DOI: 10.1111/nph.17434] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 04/15/2021] [Indexed: 05/13/2023]
Abstract
Leaves interact with a wealth of microorganisms. Among these, fungi are highly diverse and are known to contribute to plant health, leaf senescence and early decomposition. However, patterns and drivers of the seasonal dynamics of foliar fungal communities are poorly understood. We used a multifactorial experiment to investigate the influence of warming and tree genotype on the foliar fungal community on the pedunculate oak Quercus robur across one growing season. Fungal species richness increased, evenness tended to decrease, and community composition strongly shifted during the growing season. Yeasts increased in relative abundance as the season progressed, while putative fungal pathogens decreased. Warming decreased species richness, reduced evenness and changed community composition, especially at the end of the growing season. Warming also negatively affected putative fungal pathogens. We only detected a minor imprint of tree genotype and warming × genotype interactions on species richness and community composition. Overall, our findings demonstrate that warming plays a larger role than plant genotype in shaping the seasonal dynamics of the foliar fungal community on oak. These warming-induced shifts in the foliar fungal community may have a pronounced impact on plant health, plant-fungal interactions and ecosystem functions.
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Affiliation(s)
- Maria Faticov
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Svante Arrhenius väg 20A, Stockholm, SE-106 91, Sweden
| | - Ahmed Abdelfattah
- Institute of Environmental Biotechnology, Graz University of Technology, Petersgasse 12, Graz, A-8010, Austria
| | - Tomas Roslin
- Department of Ecology, Swedish University of Agricultural Sciences, PO Box 7044, Uppsala, SE-756 51, Sweden
| | | | - Peter Hambäck
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Svante Arrhenius väg 20A, Stockholm, SE-106 91, Sweden
| | - F Guillaume Blanchet
- Département de Biologie, Faculté des Sciences, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke, QC, J1K 2R1, Canada
- Département de Mathématique, Faculté des Sciences, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke, QC, J1K 2R1, Canada
- Département des Sciences de la Santé Communautaire, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, QC, J1H 5N4, Canada
| | - Björn D Lindahl
- Department of Soil and Environment, Swedish University of Agricultural Sciences, PO Box 7014, Uppsala, SE-750 07, Sweden
| | - Ayco J M Tack
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Svante Arrhenius väg 20A, Stockholm, SE-106 91, Sweden
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Mertens D, Bouwmeester K, Poelman EH. Intraspecific variation in plant-associated herbivore communities is phylogenetically structured in Brassicaceae. Ecol Lett 2021; 24:2314-2327. [PMID: 34331409 PMCID: PMC9291228 DOI: 10.1111/ele.13852] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/14/2021] [Accepted: 07/05/2021] [Indexed: 11/30/2022]
Abstract
As a result of co‐evolution between plants and herbivores, related plants often interact with similar herbivore communities. Variation in plant–herbivore interactions is determined by variation in underlying functional traits and by ecological and stochastic processes. Hence, typically, only a subset of possible interactions is realised on individual plants. We show that insect herbivore communities assembling on individual plants are structured by plant phylogeny among 12 species in two phylogenetic lineages of Brassicaceae. This community sorting to plant phylogeny was retained when splitting the community according to herbivore feeding guilds. Relative abundance of herbivores as well as the size of the community structured community dissimilarity among plant species. Importantly, the amount of intraspecific variation in realised plant–herbivore interactions is also phylogenetically structured. We argue that variability in realised interactions that are not directly structured by plant traits is ecologically relevant and must be considered in the evolution of plant defences.
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Affiliation(s)
- Daan Mertens
- Laboratory of Entomology, Wageningen University and Research, Wageningen, The Netherlands
| | - Klaas Bouwmeester
- Biosystematics Group, Wageningen University and Research, Wageningen, The Netherlands
| | - Erik H Poelman
- Laboratory of Entomology, Wageningen University and Research, Wageningen, The Netherlands
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Heterozygous Trees Rebound the Fastest after Felling by Beavers to Positively Affect Arthropod Community Diversity. FORESTS 2021. [DOI: 10.3390/f12060694] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Although genetic diversity within stands of trees is known to have community-level consequences, whether such effects are present at an even finer genetic scale is unknown. We examined the hypothesis that genetic variability (heterozygosity) within an individual plant would affect its dependent community, which adds a new dimension to the importance of genetic diversity. Our study contrasted foliar arthropod community diversity and microsatellite marker-derived measures of genetic diversity of cottonwood (Populus fremontii) trees that had been felled by beavers (Castor canadensis) and were resprouting, relative to adjacent standing, unfelled trees. Three patterns emerged: 1. Productivity (specific leaf area), phytochemical defenses (salicortin), and arthropod community richness, abundance, and diversity were positively correlated with the heterozygosity of individual felled trees, but not with that of unfelled trees; 2. These relationships were not explained by population substructure, genetic relatedness of the trees, or hybridization; 3. The underlying mechanism appears to be that beaver herbivory stimulates increased productivity (i.e., 2× increase from the most homozygous to the most heterozygous tree) that is the greatest in more heterozygous trees. Salicortin defenses in twigs were also expressed at higher concentrations in more heterozygous trees (i.e., 3× increase from the most homozygous to the most heterozygous tree), which suggests that this compound may dissuade further herbivory by beavers, as has been found for other mammalian herbivores. We suggest that high stress to trees as a consequence of felling reveals a heterozygosity–productivity linkage, which in turn is attractive to arthropods. Although experiments are required to demonstrate causality, these results link the genetic diversity of individual trees to community diversity, supporting the hypothesis that interactions among foundation species (beavers and trees) have community-level effects, and underscores the importance of genetic diversity for biodiversity, conservation, and restoration.
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Zhang L, Hood GR, Carroo I, Ott JR, Egan SP. Context-Dependent Reproductive Isolation: Host Plant Variability Drives Fitness of Hybrid Herbivores. Am Nat 2021; 197:732-739. [PMID: 33989147 DOI: 10.1086/714139] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractThe role of divergent selection between alternative environments in promoting reproductive isolation (RI) between lineages is well recognized. However, most studies view each divergent environment as homogenous, thereby overlooking the potential role within-environment variation plays in RI between differentiating lineages. Here, we test the importance of microenvironmental variation in RI by using individual trees of two host plants, each harboring locally adapted populations of the cynipid wasp Belonocnema treatae. We compared the fitness surrogate (survival) of offspring from hybrid crosses with resident crosses across individual trees on each of two primary host plants, Quercus virginiana and Q. geminata. We found evidence of weak hybrid inviability between host-associated lineages of B. treatae despite strong genomic differentiation. However, averaging across environments masked great variation in hybrid fitness on individual trees, where hybrids performed worse than, equal to, or better than residents. Thus, considering the environmental context of hybridization is critical to improving the predictability of divergence under variable selection.
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Cole CT, Morrow CJ, Barker HL, Rubert-Nason KF, Riehl JFL, Köllner TG, Lackus ND, Lindroth RL. Growing up aspen: ontogeny and trade-offs shape growth, defence and reproduction in a foundation species. ANNALS OF BOTANY 2021; 127:505-517. [PMID: 32296821 PMCID: PMC7988516 DOI: 10.1093/aob/mcaa070] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 04/13/2020] [Indexed: 05/04/2023]
Abstract
BACKGROUND AND AIMS Intraspecific variation in foundation species of forest ecosystems can shape community and ecosystem properties, particularly when that variation has a genetic basis. Traits mediating interactions with other species are predicted by simple allocation models to follow ontogenetic patterns that are rarely studied in trees. The aim of this research was to identify the roles of genotype, ontogeny and genotypic trade-offs shaping growth, defence and reproduction in aspen. METHODS We established a common garden replicating >500 aspen genets in Wisconsin, USA. Trees were measured through the juvenile period into the onset of reproduction, for growth, defence chemistry (phenolic glycosides and condensed tannins), nitrogen, extrafloral nectaries, leaf morphology (specific leaf area), flower production and foliar herbivory and disease. We also assayed the TOZ19 sex marker and heterozygosity at ten microsatellite loci. KEY RESULTS We found high levels of genotypic variation for all traits, and high heritabilities for both the traits and their ontogenetic trajectories. Ontogeny strongly shaped intraspecific variation, and trade-offs among growth, defence and reproduction supported some predictions while contradicting others. Both direct resistance (chemical defence) and indirect defence (extrafloral nectaries) declined during the juvenile stage, prior to the onset of reproduction. Reproduction was higher in trees that were larger, male and had higher individual heterozygosity. Growth was diminished by genotypic allocation to both direct and indirect defence as well as to reproduction, but we found no evidence of trade-offs between defence and reproduction. CONCLUSIONS Key traits affecting the ecological communities of aspen have high levels of genotypic variation and heritability, strong patterns of ontogeny and clear trade-offs among growth, defence and reproduction. The architecture of aspen's community genetics - its ontogeny, trade-offs and especially its great variability - is shaped by both its broad range and the diverse community of associates, and in turn further fosters that diversity.
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Affiliation(s)
- Christopher T Cole
- Department of Entomology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, USA
| | - Clay J Morrow
- Department of Entomology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, USA
| | - Hilary L Barker
- Department of Entomology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, USA
| | - Kennedy F Rubert-Nason
- Department of Entomology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, USA
- Department of Natural and Behavioral Sciences, University of Maine at Ft. Kent, 23 University Drive, Fort Kent, ME, USA
| | - Jennifer F L Riehl
- Department of Entomology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, USA
| | - Tobias G Köllner
- Max Planck Institute for Chemical Ecology, Department of Biochemistry, Hans-Knöll-Strasse 8, Jena, Germany
| | - Nathalie D Lackus
- Max Planck Institute for Chemical Ecology, Department of Biochemistry, Hans-Knöll-Strasse 8, Jena, Germany
| | - Richard L Lindroth
- Department of Entomology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, USA
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Consistent community genetic effects in the context of strong environmental and temporal variation in Eucalyptus. Oecologia 2021; 195:367-382. [PMID: 33471200 DOI: 10.1007/s00442-020-04835-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 12/12/2020] [Indexed: 10/22/2022]
Abstract
Provenance translocations of tree species are promoted in forestry, conservation, and restoration in response to global climate change. While this option is driven by adaptive considerations, less is known of the effects translocations can have on dependent communities. We investigated the relative importance and consistency of extended genetic effects in Eucalyptus using two species-E. globulus and E. pauciflora. In E. globulus, the dependent arthropod and pathogen canopy communities were quantified based on the abundance of 49 symptoms from 722 progeny from 13 geographic sub-races across 2 common gardens. For E. pauciflora, 6 symptoms were quantified over 2 years from 238 progeny from 16 provenances across 2 common gardens. Genetic effects significantly influenced communities in both species. However, site and year effects outweighed genetic effects with site explaining approximately 3 times the variation in community traits in E. globulus and site and year explaining approximately 6 times the variation in E. pauciflora. While the genetic effect interaction terms were significant in some community traits, broad trends in community traits associated with variation in home-site latitude for E. globulus and home-site altitude for E. pauciflora were evident. These broad-scale trends were consistent with patterns of adaptive differentiation within each species, suggesting there may be extended consequences of local adaptation. While small in comparison to site and year, the consistency of genetic effects highlights the importance of provenance choice in tree species, such as Eucalyptus, as adaptive divergence among provenances may have significant long-term effects on biotic communities.
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Eisenring M, Unsicker SB, Lindroth RL. Spatial, genetic and biotic factors shape within‐crown leaf trait variation and herbivore performance in a foundation tree species. Funct Ecol 2020. [DOI: 10.1111/1365-2435.13699] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael Eisenring
- Department of Entomology University of Wisconsin‐Madison Madison WI USA
- Forest Entomology Swiss Federal Research Institute WSL Birmensdorf Switzerland
| | - Sybille B. Unsicker
- Department of BiochemistryMax Planck Institute for Chemical Ecology Jena Germany
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Valdés-Correcher E, Bourdin A, González-Martínez SC, Moreira X, Galmán A, Castagneyrol B, Hampe A. Leaf chemical defences and insect herbivory in oak: accounting for canopy position unravels marked genetic relatedness effects. ANNALS OF BOTANY 2020; 126:865-872. [PMID: 32463869 PMCID: PMC7539359 DOI: 10.1093/aob/mcaa101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 05/22/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND AND AIMS Highly controlled experiments document that plant genetic diversity and relatedness can shape herbivore communities and patterns of herbivory. Evidence from the field is, however, scarce and inconsistent. We assessed whether a genetic signal underlying herbivory can be detected in oak woodlands when accounting for variation at smaller (within-tree) and larger (among-stand) scales. METHODS We tested relationships between tree genetic relatedness, leaf chemical defences and insect herbivory for different canopy layers in 240 trees from 15 pedunculate oak (Quercus robur) forest stands. We partitioned sources of variability in herbivory and defences among stands, individuals and branches. KEY RESULTS Leaf defences, insect herbivory and their relationship differed systematically between the upper and the lower tree canopy. When accounting for this canopy effect, the variation explained by tree genetic relatedness rose from 2.8 to 34.1 % for herbivory and from 7.1 to 13.8 % for leaf defences. The effect was driven by markedly stronger relationships in the upper canopy. CONCLUSIONS Our findings illustrate that considerable effects of the host plant genotype on levels of leaf chemical defences and associated insect herbivory can be detected in natural tree populations when within-individual variation is properly accounted for.
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Affiliation(s)
| | | | | | - Xoaquín Moreira
- Misión Biológica de Galicia (MBG-CSIC), Pontevedra, Galicia, Spain
| | - Andrea Galmán
- Misión Biológica de Galicia (MBG-CSIC), Pontevedra, Galicia, Spain
| | | | - Arndt Hampe
- INRAE, Univ. Bordeaux, BIOGECO, Cestas, France
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Faticov M, Ekholm A, Roslin T, Tack AJM. Climate and host genotype jointly shape tree phenology, disease levels and insect attacks. OIKOS 2019. [DOI: 10.1111/oik.06707] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Maria Faticov
- Dept of Ecology, Environment and Plant Sciences, Stockholm Univ. Stockholm Sweden
| | - Adam Ekholm
- Dept of Ecology, Swedish Univ. of Agricultural Sciences Uppsala Sweden
| | - Tomas Roslin
- Dept of Ecology, Swedish Univ. of Agricultural Sciences Uppsala Sweden
| | - Ayco J. M. Tack
- Dept of Ecology, Environment and Plant Sciences, Stockholm Univ. Stockholm Sweden
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Cope OL, Kruger EL, Rubert‐Nason KF, Lindroth RL. Chemical defense over decadal scales: Ontogenetic allocation trajectories and consequences for fitness in a foundation tree species. Funct Ecol 2019. [DOI: 10.1111/1365-2435.13425] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Olivia L. Cope
- Department of Integrative Biology University of Wisconsin‐Madison Madison WI USA
| | - Eric L. Kruger
- Department of Forest and Wildlife Ecology University of Wisconsin‐Madison Madison WI USA
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Barker HL, Riehl JF, Bernhardsson C, Rubert-Nason KF, Holeski LM, Ingvarsson PK, Lindroth RL. Linking plant genes to insect communities: Identifying the genetic bases of plant traits and community composition. Mol Ecol 2019; 28:4404-4421. [PMID: 31233634 DOI: 10.1111/mec.15158] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 05/31/2019] [Accepted: 06/03/2019] [Indexed: 12/30/2022]
Abstract
Community genetics aims to understand the effects of intraspecific genetic variation on community composition and diversity, thereby connecting community ecology with evolutionary biology. Thus far, research has shown that plant genetics can underlie variation in the composition of associated communities (e.g., insects, lichen and endophytes), and those communities can therefore be considered as extended phenotypes. This work, however, has been conducted primarily at the plant genotype level and has not identified the key underlying genes. To address this gap, we used genome-wide association mapping with a population of 445 aspen (Populus tremuloides) genets to identify the genes governing variation in plant traits (defence chemistry, bud phenology, leaf morphology, growth) and insect community composition. We found 49 significant SNP associations in 13 Populus genes that are correlated with chemical defence compounds and insect community traits. Most notably, we identified an early nodulin-like protein that was associated with insect community diversity and the abundance of interacting foundation species (ants and aphids). These findings support the concept that particular plant traits are the mechanistic link between plant genes and the composition of associated insect communities. In putting the "genes" into "genes to ecosystems ecology", this work enhances understanding of the molecular genetic mechanisms that underlie plant-insect associations and the consequences thereof for the structure of ecological communities.
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Affiliation(s)
- Hilary L Barker
- Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI, USA
| | - Jennifer F Riehl
- Department of Entomology, University of Wisconsin-Madison, Madison, WI, USA
| | | | | | - Liza M Holeski
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, USA
| | - Pär K Ingvarsson
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Richard L Lindroth
- Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI, USA.,Department of Entomology, University of Wisconsin-Madison, Madison, WI, USA
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Damestoy T, Brachi B, Moreira X, Jactel H, Plomion C, Castagneyrol B. Oak genotype and phenolic compounds differently affect the performance of two insect herbivores with contrasting diet breadth. TREE PHYSIOLOGY 2019; 39:615-627. [PMID: 30668790 DOI: 10.1093/treephys/tpy149] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 12/13/2018] [Accepted: 12/19/2018] [Indexed: 05/16/2023]
Abstract
Research on plant-herbivore interactions has long recognized that plant genetic variation plays a central role in driving insect abundance and herbivory, as well as in determining plant defense. However, how plant genes influence herbivore feeding performances, and which plant defensive traits mediate these effects, remain poorly understood. Here we investigated the feeding performances of two insect leaf chewers with contrasting diet breadth (the generalist Lymantria dispar L. and the specialist Thaumetopoea processionea L.) on different genotypes of pedunculate oak (Quercus robur L.) and tested the role of leaf phenolics. We used leaves from four clones of 30 Q. robur full-sibs grown in a common garden to estimate the performance of both herbivores in laboratory feeding trials and to quantify the concentration of constitutive chemical defences (phenolic compounds). We found that tree genetics influenced leaf consumption by T. processionea but not by L. dispar. However genetic variation among trees did not explain growth rate variation in either herbivore nor in leaf phenolics. Interestingly, all phenolic compounds displayed a positive relationship with L. dispar growth rate, and leaf consumption by both herbivores displayed a positive relationship with the concentrations of condensed tannins, suggesting that highly defended leaves could induce a compensatory feeding response. While genetic variation in oaks did not explain herbivore growth rate, we found positive genetic correlations between the two herbivores for leaf consumption and digestion. Overall, we found that oak genotype and phenolic compounds partly and independently contribute to variability in herbivore performance. We challenged the current view of plant-insect interaction and provided little support to the idea that the effect of plant genotype on associated organisms is driven by plant defences. Together, our results point to the existence of genetically determined resistance traits in oaks whose effects differ between herbivores and motivate further research on mechanisms governing oak-herbivore interactions.
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Affiliation(s)
- Thomas Damestoy
- BIOGECO, INRA, Univ. Bordeaux, 69 route d'Arcachon, Cestas Cedex, France
| | - Benjamin Brachi
- BIOGECO, INRA, Univ. Bordeaux, 69 route d'Arcachon, Cestas Cedex, France
| | - Xoaquín Moreira
- Misión Biológica de Galicia (MBG-CSIC), Apartado de correos 28, Pontevedra, Galicia, Spain
| | - Hervé Jactel
- BIOGECO, INRA, Univ. Bordeaux, 69 route d'Arcachon, Cestas Cedex, France
| | - Christophe Plomion
- BIOGECO, INRA, Univ. Bordeaux, 69 route d'Arcachon, Cestas Cedex, France
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Barker HL, Holeski LM, Lindroth RL. Independent and interactive effects of plant genotype and environment on plant traits and insect herbivore performance: A meta‐analysis with Salicaceae. Funct Ecol 2018. [DOI: 10.1111/1365-2435.13249] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hilary L. Barker
- Department of Integrative Biology University of Wisconsin‐Madison Madison Wisconsin
| | - Liza M. Holeski
- Department of Biological Sciences Northern Arizona University Flagstaff Arizona
| | - Richard L. Lindroth
- Department of Integrative Biology University of Wisconsin‐Madison Madison Wisconsin
- Department of Entomology University of Wisconsin‐Madison Madison Wisconsin
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