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Dissertations / Theses on the topic 'Herbivore defense'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Trager, Matthew David. "Ant occupancy and anti-herbivore defense of Cordia alliodora, a neotropical myrmecophyte." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013344.

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2

Winterer, Juliette. "The ecology and evolution of plant defense, herbivore tolerance, and disease virulence /." Thesis, Connect to this title online; UW restricted, 1995. http://hdl.handle.net/1773/5241.

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3

Burghardt, Karin Twardosz. "Linking Plasticity in Goldenrod Anti-herbivore Defense to Population, Community, and Ecosystem Processes." Thesis, Yale University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10584938.

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<p> Nutrient cycling plays a critical role in maintaining biodiversity and ecosystem services in agricultural, urban, and natural lands. However, across landscapes there is substantial unexplained heterogeneity in nutrient cycling. Classic thinking holds that abiotic factors are the source of this spatial heterogeneity with a secondary role of plant biomass. However, recent work suggests that higher trophic levels or variation in traits at the level of plant genotype may also play an important role in structuring nutrient environments. For instance, herbivores may indirectly create heterogenei

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4

Hatada, Aya. "Comparative study about anti-herbivore defense of Macaranga species in a Bornean forest." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/149133.

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5

Satou, Yasuhiro. "Associational anti-herbivore defense in the trichome dimorphism of Arabidopsis halleri subsp. gemmifera (Brassicaceae)." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215349.

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6

Hernán, Martínez Gema. "Defense strategies against herbivory in seagrasses." Doctoral thesis, Universitat de les Illes Balears, 2017. http://hdl.handle.net/10803/565412.

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[cat] [cat]Introducció L’ herbivorisme és un procés ecològic clau que regula la composició i l’estructura de les comunitats de plantes i determina la transferència d'energia de productors primaris a la resta de la cadena tròfica. Les plantes han desenvolupat diversos mecanismes de defensa per evitar o resistir l’herbivorisme. Entre ells destaquen les estratègies tolerància, que disminueixen l'efecte de l’herbivorisme en la vitalitat de la planta (ex. acumulació de reserves en teixits subterranis) i les estratègies de resistència, l’objectiu de les quals evitar el consum (ex. augm

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7

Call, Anson Clark. "Physiological Effects of Pathogen and Herbivore Risks Encountered by Quaking Aspen." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6938.

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Quaking aspen (Populus tremuloides) is the most widely distributed tree in North America (Lindroth and St Clair 2013), and a keystone species in our western montane forests (Worrall et al. 2015). Aspen has become a model organism for studies of genetics and physiology in woody plants (Bradshaw et al. 2000, Taylor 2002). Aspen is also economicallyimportant (Worrall et al. 2015) – wood is harvested for various uses, its scenic beauty helps sustain the tourism economy in many areas, and it has recently been studied as a possible source of biofuel (Sannigrahi et al. 2010). Aspen is also a species

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8

Hattas, Dawood. "Carbon based secondary metabolites in African savanna woody species in relation to anti-herbivore defense." Doctoral thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13190.

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Includes bibliographical references.<br>Chemical defense in African savanna woody species have been inferred from foliar condensed tannin and total phenolic concentrations. However these measures are controversial since condensed tannin chemical heterogeneity compromises its simple quantification and total phenolics, which is a measure of general foliar phenolics, includes many different low molecular weight phenolics. Some of these low molecular weight phenolics have been shown to deter herbivory individually or in combination with others. The growth differentiation balance hypothesis predict

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9

Bernhardsson, Carolina. "Molecular population genetics of inducible defense genes in Populus tremula." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-54361.

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Plant-herbivore interactions are among the most common of ecological interactions. It is therefore not surprising that plants have evolved multiple mechanisms to defend themselves, using both constitutive chemical and physical barriers and by induced responses which are only expressed after herbivory has occurred. Herbivores, on the other hand, respond to these plant defenses by evolving counter-adaptations which makes defenses less effective or even useless. Adaptation can occur at different geographical scales, with varying coevolutionary interactions across a spatially heterogenous landscap

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10

Zhang, Jingyu. "Cell-type specificity and herbivore-induced responses of primary and terpene secondary metabolism in Arabidopsis roots." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23742.

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Plants employ diverse defense mechanisms to combat attack by harmful organisms. For instance, plants produce constitutive physical barriers or use chemical compounds such as specialized secondary metabolites to resist herbivore or pathogen invasion. Considering the cost-efficiency and energy balance between defense, growth and reproduction, defense reactions in plants have to be regulated temporally and spatially. As more cost-efficient strategies, plants may induce their defense response only in the presence of the attacker or restrict constitutive defenses to specific tissues or cells. I

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11

Schäfer, Martin Verfasser], Thomas [Akademischer Betreuer] Schmülling, Ian T. [Akademischer Betreuer] [Baldwin, and Maria [Akademischer Betreuer] Mittag. "The role of cytokinins in plant-herbivore interactions : response to herbivory and effects on plant defense / Martin Schäfer. Gutachter: Thomas Schmülling ; Ian Thomas Baldwin ; Maria Mittag." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2015. http://d-nb.info/107603862X/34.

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12

Schäfer, Martin [Verfasser], Thomas Akademischer Betreuer] Schmülling, Ian T. [Akademischer Betreuer] [Baldwin, and Maria [Akademischer Betreuer] Mittag. "The role of cytokinins in plant-herbivore interactions : response to herbivory and effects on plant defense / Martin Schäfer. Gutachter: Thomas Schmülling ; Ian Thomas Baldwin ; Maria Mittag." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2015. http://d-nb.info/107603862X/34.

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13

Vaughan, Martha Marie. "Molecular and Functional Characterization of Terpene Chemical Defense in Arabidopsis Roots in Interaction with the Herbivore Bradysia spp. (fungus gnat)." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77974.

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Roots and leaves are integrated structural elements that together sustain plant growth and development. Insect herbivores pose a constant threat to both above- and belowground plant tissues. To ward off herbivorous insects, plants have developed different strategies such as direct and indirect chemical defense mechanisms. Research has primarily focused on visible aboveground interactions between plants and herbivores. Root-feeding insects, although often overlooked, play a major role in inducing physical and physiological changes in plants. However, little is known about how plants deploy chem

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14

Ullmann-Zeunert, Lynn [Verfasser], Ian T. [Akademischer Betreuer] Baldwin, Ralf [Akademischer Betreuer] Oelmüller, and Dam Nicole [Akademischer Betreuer] van. "Trade-offs of induced herbivore defense in Nicotiana attenuata : the role of early signaling and defense metabolite biosynthesis / Lynn Ullmann-Zeunert. Gutachter: Ian T. Baldwin ; Ralf Oelmüller ; Nicole van Dam." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2013. http://d-nb.info/1041255861/34.

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15

Forslund, Helena. "Grazing and the geographical range of seaweeds : The introduced Fucus evanescens and the newly described Fucus radicans." Licentiate thesis, Stockholms universitet, Botaniska institutionen, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-36255.

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Along the coast of temperate oceans brown algae of the genus Fucus form dense stands on rocky shores and are keystone species of the coastal ecosystem. These large seaweeds are perennial and function as substrate for many sessile marine organisms, provide shelter for fauna and juvenile fish, and are food source. A number of abiotic (e.g. wave-exposure, salinity and substrate) and biotic (e.g. herbivory and competition) factors structures these communities and determines the abundance and composition of fucoids at each specific site. Earlier studies have shown that herbivores may reduce growth

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16

Scholz, Sandra [Verfasser], Axel [Akademischer Betreuer] Mithöfer, Severin [Akademischer Betreuer] Sasso, and Christian [Akademischer Betreuer] Mazars. "Role of calmodulin-like proteins in calcium-mediated herbivore defense pathways in arabidopsis / Sandra Scholz. Gutachter: Axel Mithöfer ; Severin Sasso ; Christian Mazars." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2016. http://d-nb.info/1094662534/34.

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17

Stitz, Michael [Verfasser], Ian T. [Akademischer Betreuer] Baldwin, Günter [Akademischer Betreuer] Theißen, and Chris [Akademischer Betreuer] Kuhlemeier. "Making love and war : jasmonate signaling in herbivore defense and flower development in Nicotiana attenuata / Michael Stitz. Gutachter: Ian Thomas Baldwin ; Günter Theißen ; Chris Kuhlemeier." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2014. http://d-nb.info/1054636591/34.

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18

Weinhold, Alexander [Verfasser], Georg Akademischer Betreuer] Pohnert, and Ian T. [Akademischer Betreuer] [Baldwin. "Trichomes in plant-herbivore interactions : the first line of defense of the wild tobacco Nicotiana attenuata against attacking insects / Alexander Weinhold. Gutachter: Georg Pohnert ; Ian T. Baldwin." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2012. http://d-nb.info/102770672X/34.

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19

Soares, Eduardo Calixto. "Interação formiga-planta: impacto da variação na oferta de néctar extrafloral sobre o forrageamento de formigas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/59/59131/tde-15092015-223749/.

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As plantas, produtores da base das cadeias tróficas, apresentam diversos tipos de defesas contra a ação de consumidores, os herbívoros, podendo ser defesas físicas, químicas e bióticas. Nas defesas bióticas, plantas fornecem recursos alimentares (e.g. néctar extrafloral) e/ou moradia para predadores que em troca podem fornecer proteção contra herbívoros. Assim, a partir de comportamentos agressivos e/ou de patrulha, formigas são consideradas os principais protetores de plantas. Nessa perspectiva, a presente dissertação buscou investigar a influência que o néctar extrafloral tem sob a interação

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20

Sieg, Robert Drew. "Chemically-mediated interactions in salt marshes: mechanisms that plant communities use to deter closely associated herbivores and pathogens." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47590.

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Herbivores and pathogens pose a consistent threat to plant productivity. In response, plants invest in structural and/or chemical defenses that minimize damage caused by these biotic stressors. In salt marshes along the Atlantic coast of the United States, a facultative mutualism between snails (Littoraria irrorata) and multiple species of fungi exert intense top-down control of the foundation grass species Spartina alterniflora. Since exposure to herbivores and pathogens are tightly coupled in this system, I investigated whether S. alterniflora utilizes chemical and/or structural defenses

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21

Joo, Youngsung [Verfasser], Ian T. [Gutachter] Baldwin, C. Robertson Gutachter] McClung, and Ralf [Gutachter] [Oelmüller. "Coping with variable herbivore community : ecological consequences of temporal dynamics and tissue-specific defense in Nicotiana attenuata / Youngsung Joo ; Gutachter: Ian T. Baldwin, C. Robertson McClung, Ralf Oelmüller." Jena : Friedrich-Schiller-Universität Jena, 2018. http://d-nb.info/1170396488/34.

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22

Shimizu, Kaya. "Host plant use in the assemblage of herbivorous insects on Macaranga myrmecophytes." Kyoto University, 2014. http://hdl.handle.net/2433/188797.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第18359号<br>人博第672号<br>新制||人||162(附属図書館)<br>25||人博||672(吉田南総合図書館)<br>31217<br>京都大学大学院人間・環境学研究科相関環境学専攻<br>(主査)教授市岡孝朗, 教授加藤眞, 教授松井正文<br>学位規則第4条第1項該当

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23

Meza, Canales Ivan David [Verfasser], Ian T. [Gutachter] Baldwin, Maria [Gutachter] Mittag, and Evan H. [Gutachter] DeLucia. "Phyto-hormonal regulation of local and systemic defense and photosynthetic-responses to herbivore perception in Nicotiana attenuata / Ivan David Meza Canales ; Gutachter: Ian T. Baldwin, Maria Mittag, Evan H. DeLucia." Jena : Friedrich-Schiller-Universität Jena, 2018. http://d-nb.info/1170398782/34.

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24

Heckman, Melanie L. "A test of optimal defense theory vs. the growth-differentiation balance hypothesis as predictors of seaweed palatability and defenses." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42720.

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Because organisms have limited resources to allocate to multiple life history traits, the Optimal Defense Theory (ODT) and the Growth-Differentiation Balance Hypothesis (GDBH) were developed by terrestrial plant ecologists to predict intraindividual defense allocation based on the cost of defense and these life history trade-offs. However, these theories have garnered equivocal experimental support over the years and are rarely experimentally extended from predictions of plant physiology to the palatability of the tissues an herbivore experiences. We therefore examined tissue palatability, n

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25

Tsuji, Kaoru. "Sexual difference in plant defenses and herbivore adaptation." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157819.

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26

Goodman, Keri M. "Freshwater red algae use activated chemical defenses against herbivores." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41208.

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Chemically mediated interactions have important ecological and evolutionary effects on populations and communities. Despite recognition that herbivory can significantly affect the biomass and composition of freshwater macrophyte communities, there are few investigations of chemical defenses among freshwater vascular plants and mosses and none of freshwater red algae. This study compares the palatability of five species of freshwater red algae (Batrachospermum helminthosum, Boldia erythrosiphon, Kumanoa sp., Paralemanea annulata, and Tuomeya americana) that occur in the southeastern United St

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Barton, Kasey Elisabeth. "Seedling defense strategies: Effects of plant age, herbivory and competition." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3256440.

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Cabioch, Léa. "Chemical signaling and defense in brown algal kelps during interactions with herbivores." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066708/document.

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Les kelps sont des espèces clés dans les écosystèmes marins tempérés, elles vivent en milieu intertidal le long des côtes où elles sont souvent exposées à des herbivores. Comme la plupart des organismes sessiles, les kelps ont développé des stratégies de défense contre l’herbivorie. Chez la laminaire Laminaria digitata, l’élicitation par les oligoguluronates induit des régulations transcriptomiques et l’activation de voies métaboliques, menant à la production et la libération de métabolites dans l’environnement, tels que des aldéhydes. De plus, cette espèce d’algue brune a montré des réponses

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Loiola, Priscilla de Paula. "Distribuição espacial de espécies arbóreas de cerrado: filogenia e traços de defesa contra herbivoria." Universidade Federal de São Carlos, 2010. https://repositorio.ufscar.br/handle/ufscar/1983.

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Made available in DSpace on 2016-06-02T19:31:49Z (GMT). No. of bitstreams: 1 2945.pdf: 303758 bytes, checksum: de7faa99d7e5400bd1e80b42c03abb3b (MD5) Previous issue date: 2010-03-02<br>Universidade Federal de Minas Gerais<br>Herbivory is expected to promote an overdispersed distribution of traits in co-occurring plant species, since similar plants are more vulnerable to specialised herbivores. As long as conservatism of traits is usually observed in lineages of plant species, phylogenetic relatedness may also be related to spatial distribution. Thus, we expected that defense traits against h

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30

Majorczyk, Alexis M. "Chemical Defense Mechanisms of Arabidopsis thaliana Against Insect Herbivory: The Role of Glucosinolate Hydrolysis Products." Bowling Green, Ohio : Bowling Green State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1249513273.

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31

McNutt, David William. "Evolutionary constraints on plasticity in the anti-herbivore defenses of Solanum carolinense." Thesis, The Florida State University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3612462.

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<p> Many organisms live in temporally or spatially heterogeneous environments. One adaptive response to environmental heterogeneity is phenotypic plasticity, or the ability of an organism to change its phenotype in response to environmental variation. Plasticity is particularly important for plants, which cannot easily escape environmental stresses (e.g., competition, herbivory, or drought), and therefore is common in many morphological and physiological traits that allow plants to cope with stresses. Despite numerous examples of the adaptive value of plasticity in plant traits, the reaction n

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Philippe, Ryan Nicholas. "Genomics of systemic induced defense responses to insect herbivory in hybrid poplar." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/5303.

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The availability of a poplar (Populus trichocarpa Torr & A. Gray, black cottonwood) genome sequence is enabling new research approaches in angiosperm tree biology. Much of the recent genomics research in poplars has been on wood formation, growth and development, and abiotic stress tolerance, motivated, at least in part, by the fact that poplars provide an important system for large scale, short-rotation plantation forestry in the Northern Hemisphere. Given their widespread distribution and long lifespan, poplar trees are threatened by a large variety of insect herbivore pests, and must deal w

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33

Puentes, Adriana. "Plant-Herbivore Interactions and Evolutionary Potential of Natural Arabidopsis lyrata Populations." Doctoral thesis, Uppsala universitet, Växtekologi och evolution, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183433.

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In this thesis, I combined field, greenhouse and common-garden experiments to examine the ecological and evolutionary consequences of plant-herbivore interactions and the genetic architecture of fitness-related traits in the insect-pollinated, self-incompatible, perennial herb Arabidopsis lyrata. More specifically, I examined (1) whether damage to leaves and inflorescences affects plant fitness non-additively, (2) whether trichome production is associated with a cost in terms of reduced tolerance to leaf and inflorescence damage, (3) whether young plant resistance to a specialist insect herbiv

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34

Morrison, Wendy Elizabeth. "Aquatic plant-herbivore interactions across multiple spatial scales." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34734.

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For decades scientists believed that herbivory had minimal impact on freshwater ecosystems. We now know that herbivory in freshwater systems equals or exceeds herbivory in terrestrial and marine systems. In extreme cases, herbivores can change clear, macrophyte dominated ecosystems into turbid plankton dominated ecosystems. Even though research on plant-herbivore interactions in freshwater systems has increased, there is still much that is unknown. This thesis is comprised of four studies investigating freshwater plant-herbivore interactions across multiple spatial scales. The first stud

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35

Rooke, Tuulikki. "Defences and responses : woody species and large herbivores in African savannas /." Umeå : Dept. of Animal Ecology, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/s276.pdf.

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Cruz, Nayara Gomes da. "Formigas associadas a Turnera subulata (Turneraceae) : custos e/ou benefícios para planta hospedeira?" Universidade Federal de Sergipe, 2016. https://ri.ufs.br/handle/riufs/4476.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Ecological interactions between organisms are complex and can present dynamic results, which are dependent on environmental context. Plants with extrafloral nectaries attract a wide variety of ants species, in associations commonly considered mutualistic. In tropical environments the combination of plants and ants play an important role in communities. Turnera subulata is a ruderal shrub widely distributed in disturbed areas, which has a pair of extrafloral nectaries in the base of each leaf. In this study, we evaluate

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Nielson, Patrice Alexa. "Variable Palatability of Quaking Aspen for Large Ungulate Herbivores." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2589.

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Aspen is a key resource in the Rocky Mountain Region for wildlife forage and habitat, lumber products, scenery, and plays important roles in fire ecology and hydrological processes. There is evidence of aspen decline over much of the Intermountain West for approximately 100 years. In Dixie and Fishlake National Forests, UT, aspen distribution has decreased by nearly half. Causes of this decline are not well understood, although wildlife browsing by ungulates has been implicated as playing a major role. The objective of this research was to examine what soil or plant factors might be involved i

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Izquierdo, Juliana Verónica. "O papel de associação entre formigas e nectários extranupciais sobre o êxito reprodutivo de Tocoyena formosa (Rubiaceae)." Botucatu, 2017. http://hdl.handle.net/11449/150004.

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Orientador: Felipe Wanderley Amorim<br>Resumo: As plantas oferecem recurso alimentar a muitas espécies animais através de diferentes estruturas. Dentre tais estruturas estão os nectários, que são glândulas multicelulares especializadas na produção e secreção de néctar. Estes nectários podem ocorrer tanto em partes reprodutivas como vegetativas, e podem ser florais ou extraflorais. Entretanto, também podem ser classificados quanto a sua função em relação com a polinização, sendo do tipo nupcial (quando sua função está relacionada à polinização) ou extranupcial (quando sua função está relacionad

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Goodey, Nicole Ann. "Ecological patterns in plant defence chemistry and herbivore responses in natural populations of Brassica oleracea." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/21667.

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Relationships between two taxonomic kingdoms; plants and herbivorous insects, are hypothesized to be a major zone of interaction for generating current day biodiversity; and coevolutionary processes between these intricately linked organisms are hypothesized to maintain diversity in plant secondary chemistry. These metabolites play a key role in plant defence against herbivory and a high degree of intraspecific variation is observed at multiple ecological scales. However, the nature of selection maintaining variation in plant defence profiles is still a major question in evolutionary biology a

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Wan, Ho Yi. "Fire Severity and Size Alter Quaking Aspen (Populus tremuloides) Regeneration and Defense Against Ungulate Herbivory." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4381.

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Human activities and rapid global climate change are altering fire regimes with potential threat to the stability of aspen ecosystems in North America. Aspen is an early successional species that plays an important role in post-fire forest reestablishment, but chronic browsing on juvenile aspen by large ungulate herbivores after fire can be detrimental and lead to regeneration failure. Although larger and more severe fires are expected to become more prominent, whether and how this may influence aspen and ungulate communities remains unclear. The objective of this research was to examine ho

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Aucoin, Richard R. "Antioxidants and antioxidant enzymes as biochemical defenses against phototoxin ingestion by insect herbivores." Thesis, University of Ottawa (Canada), 1991. http://hdl.handle.net/10393/7679.

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Many secondary plant compounds are capable of photoactivation resulting in the production of toxic species of oxygen. One mechanism of defense for insects feeding on phototoxic plants may be the presence of antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPOX), and glutathione reductase (GR). The activities of these enzymes were examined in larvae of three lepidoptera: Ostrinia nubilalis, Manduca sexta, and Anaitis plagiata. Highest levels of antioxidant enzyme activity were found in A. plagiata, a specialist feeder on Hypericum perforatum, which

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CORRÊA, Priscila Gomes. "Defesas foliares em resposta à herbivoria em espécies lenhosas de restinga,Ipojuca-PE." Universidade Federal Rural de Pernambuco, 2007. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/4924.

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Submitted by (edna.saturno@ufrpe.br) on 2016-07-01T13:55:28Z No. of bitstreams: 1 Priscila Gomes Correa.pdf: 1508268 bytes, checksum: a32990bd4e7db41baae0a2448dea3298 (MD5)<br>Made available in DSpace on 2016-07-01T13:55:28Z (GMT). No. of bitstreams: 1 Priscila Gomes Correa.pdf: 1508268 bytes, checksum: a32990bd4e7db41baae0a2448dea3298 (MD5) Previous issue date: 2007-02-01<br>Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq<br>The leaf, the major photosynthetic plant organ, has the important function to adjust the plants to different habitats through morp

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Campos, Marcelo Lattarulo. "Controle hormonal da defesa à herbivoria em tomateiro." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11144/tde-19052009-081547/.

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Apesar de sua elevada importância econômica mundial, o cultivo do tomateiro é classificado como de alto risco devido à infestação da cultura por um grande número de pragas e doenças. Esse problema leva tal cultura a depender amplamente da aplicação de agroquímicos que, além de elevaram o custo de produção, são potenciais causadores de danos ambientais e do aparecimento de outras pragas e doenças. Observando o problema mais detalhadamente, pode-se perceber que uma grande parcela das perdas advém dos danos causados por artrópodes herbívoros, os quais são capazes de se alimentar de diversas parte

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Prill, Nadine. "Effects of environmental change on plant performance and plant-herbivore interactions." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:c58761e9-666c-4b7d-a78a-d70de7f253d4.

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Global environmental change fundamentally affects plants and their interactions with other species, and this has profound impacts on communities and ultimately ecosystems. In order to understand the mechanisms involved, we need to elaborate on the combined effects of different global change drivers on multiple levels of plant organization, including the biochemical level (production of defence compounds), the whole organism, the population, and the plant-herbivore interaction level. This thesis investigates (1) the combined effects of factors related to climate change and habitat fragmentation

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Ohlsson, Åse. "Do plants change their defence strategy from a structural defence to a chemical one as a response to heavier herbivory?" Thesis, Södertörn University College, School of Life Sciences, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-310.

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<p>To the main part, this paper is the result of a literature survey and to the minor part of a field survey. The study is found on the question of, if and why unpalatable plant species invade heavily grassed rangelands and if plants change their defence strategy from a mechanical defence to a chemical defence if the herbivory pressure increase. I conclude that defended plants do invade heavily grassed rangelands if the rangelands lose essential recourses (often nutrients) and/or the defended plants are strongly avoided by mammalian herbivores. I also conclude that plants do go from a mechanic

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Foster, Rosie. "Plants signalling to herbivores : is there a link between chemical defence and visual cues?" Thesis, University of Sussex, 2013. http://sro.sussex.ac.uk/id/eprint/45168/.

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The use of visual cues by insect herbivores is likely to be an important component of plant-herbivore interactions in the wild, yet has until recently received little attention from researchers. In the last decade, however, interest in this topic has intensified following Hamilton & Brown's (2001) autumn colouration hypothesis, which proposes that the intensity of colouration of trees at autumn time is a signal of their defensive commitment to potential herbivores. This idea remains controversial and to date robust empirical data linking colouration with chemical defence and herbivory have bee

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Croxford, Andrew C. "Wound-induced changes in plants and their defensive role against insect herbivores." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316058.

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Coleman, Ross Antony. "Herbivore behaviour, multitrophic interactions and a lack of wound-induced defence in a member of the Cruciferae." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242558.

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Cramer, Rainer Ernst Hermann [Verfasser]. "Plant priming of anti-herbivore defence by insect oviposition: Dynamics and fitness consequences / Rainer Ernst Hermann Cramer." Berlin : Freie Universität Berlin, 2021. http://d-nb.info/1236572963/34.

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Hartley, S. E. "Rapidly induced chemical changes in birch foliage : Their biochemical nature and impact on insect herbivores." Thesis, University of York, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381348.

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