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Dissertations / Theses on the topic 'Phytoalexins'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Mistry, Jayshree. "Oat phytoalexins and magnesium chelates." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276204.

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2

Kamo, Tsunashi. "Phenylphenalenone Phytoalexins from Banana Fruit." Kyoto University, 2001. http://hdl.handle.net/2433/150318.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第9105号<br>農博第1201号<br>新制||農||828(附属図書館)<br>学位論文||H13||N3564(農学部図書室)<br>UT51-2001-G825<br>京都大学大学院農学研究科応用生命科学専攻<br>(主査)教授 大東 肇, 教授 坂田 完三, 教授 津田 盛也<br>学位規則第4条第1項該当
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3

Mann, I. S. "The synthesis of benzofuran resorcinyl phytoalexins." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47168.

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4

Okanga, Francis Inyangala. "Biotransformation of cruciferous phytoalexins by pathogenic fungi." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0016/NQ37905.pdf.

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5

Gregory, Abigail C. E. "The metabolism of isoflavonoid phytoalexins in alfalfa (Medicago sativa L.)." Thesis, Durham University, 1995. http://etheses.dur.ac.uk/5422/.

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The synthesis of isoflavonoid phytoalexins in legumes is relatively well understood, but far less is known about how these phytotoxic compounds are metabolised by the plant when no longer required. In this project medicarpin, the major isoflavonoid phytoalexin in alfalfa, was prepared in radiolabelled form and fed to cell cultures and seedlings of alfalfa. The metabolism of the radioactive phytoalexin was then studied by characterising the radiolabelled metabolites formed. Uptake of radiolabelled phytoalexin by cells was faster in elicitor-treated cultures than in untreated cultures. However,
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6

Evans, D. J. "Chemical and biological studies on elicitors of lucerne phytoalexins produced by Verticillium." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636915.

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The production of the isoflavonoid phytoalexins medicarpin, sativan and vestitol by lucerne (<i>Medicago sativa</i> L) in response to substances, named elicitors, released into culture fluids of the plant-pathogenic fungus <i>Verticillium albo-atrum</i> was investigated. Methods for establishing the production of phytoalexins were studied and developed to use for screening substances from culture filtrates for elicitor activity. A method of reverse-phase High Performance Liquid Chromatography was developed in order to obtain quantitative measurements of elicitor activity. The presence of elici
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7

Labanca, Elaine Regina Godoy. "Purificação parcial de elicitores presentes em Saccharomyces cerevisiae: atividade como indutores de resistência em pepino (Cucumis sativus) contra Colletotrichum Iagenarium e da síntese de gliceolinas em soja (Glycine max)." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-03092002-170446/.

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A indução de resistência em plantas contra fitopatógenos é um método alternativo de controle de doenças, o qual envolve a ativação de mecanismos de resistência latentes da planta. Hoje no mercado existem poucos produtos que atuam segundo este princípio. Na busca de novas moléculas que possam ser utilizadas em campo, diversos compostos de origem microbiana, com capacidade de estimular uma ou mais respostas de defesa, já foram isolados e caracterizados. A Saccharomyces cerevisiae é uma levedura capaz de induzir resistência e elicitar respostas de defesa em algumas plantas. Com o objetivo de extr
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8

Carvalho, Paula Andréa Sampaio de Vasconcelos [UNESP]. "Teor de resveratrol no gênero Arachis L. e alotetraploides sintéticos e comportamento da resveratrol sintase em espécies de Arachis." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151936.

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Submitted by PAULA ANDRÉA SAMPAIO DE VASCONCELOS CARVALHO null (paulasvasconcelos@hotmail.com) on 2017-10-06T14:46:03Z No. of bitstreams: 1 tese pos defesa Paula Andréa Sampaio de Vasconcelos Carvalho.pdf1.pdf: 1988306 bytes, checksum: 46c0925bf8ca00155c63f2c83d48acac (MD5)<br>Rejected by Monique Sasaki (sayumi_sasaki@hotmail.com), reason: Solicitamos que realize uma nova submissão seguindo a orientação abaixo: O arquivo submetido está sem a ficha catalográfica. A versão submetida por você é considerada a versão final da dissertação/tese, portanto não poderá ocorrer qualquer alteração
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9

Carvalho, Paula Andréa Sampaio de Vasconcelos. "Teor de resveratrol no gênero Arachis L. e alotetraploides sintéticos e comportamento da resveratrol sintase em espécies de Arachis." Botucatu, 2017. http://hdl.handle.net/11449/151936.

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Orientador: Marcos Aparecido Gimenes<br>Resumo: O gênero Arachis possui 81, espécies distribuídas em nove seções taxonômicas, sendo o amendoim (A. hypogaea L.) a principal espécie, devido ao seu alto valor nutricional. O gênero possui também outras espécies de interesse econômico, que têm sido utilizadas em programas de melhoramento do amendoim (espécies da seção Arachis) e espécies forrageiras de outras seções do gênero. Com relação às demais espécies, o germoplasma da grande maioria está disponível para a caracterização e pode, sem dúvida, contribuir para seu uso futuro. O gênero Arachis é u
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10

Fassihiani, A. "The induction and role of sesquiterpenoid phytoalexins in aubergine (Solanum melongena L.) antifungal to Fusarium oxysporum f.sp.lycopersici." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234377.

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11

Khalil, Mohammed Nabil Ahmed [Verfasser], and Ludger [Akademischer Betreuer] Beerhues. "Biosynthesis of biphenyl and dibenzofuran phytoalexins in Sorbus aucuparia cell cultures / Mohammed Nabil Ahmed Khalil ; Betreuer: Ludger Beerhues." Braunschweig : Technische Universität Braunschweig, 2013. http://d-nb.info/1175822302/34.

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12

Lang, Saara Susanna. "Role of Subcellular Differentiation in Plant Disease Resistance." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30515.

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3-Hydroxy-3-methylglutaryl CoA reductase (HMGR, EC 1.1.1.34) catalyzes the reaction from hydroxymethylglutaryl CoA to mevalonate in the isoprenoid pathway. In solanaceous plants, one class of endproducts of the pathway are sesquiterpenoid phytoalexins, antibiotic compounds produced by plants in response to pathogens. We are interested in the role of the defense-inducible isoforms of HMGR in phytoalexin production and disease resistance. Transgenic tobacco, constitutively expressing the defense-inducible tomato hmgr isogene, hmg2, showed fewer and smaller lesions following tobacco mosaic virus
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13

Olusegun-Osoba, Elizabeth Oluwakemi. "Strategies towards the synthesis of 4-(3-methyl-but-1-enyl)-3,5,3',4'-tetrahydroxystilbene (arachidin-1) and resveratrol analogues." Thesis, University of Hertfordshire, 2015. http://hdl.handle.net/2299/17118.

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Stilbene phytoalexins such as resveratrol, 1, and the arachidins, including arachidin-1,2, are naturally synthesised by peanut (Arachis hypogaea) plants. The peanut phytoalexins are polyphenolic compounds consisting of a stilbene backbone, with a number of derivatives also possessing a prenyl moiety. These distinctive phytoalexins have gained attention, as they exhibit various biological activities, for instance arachidin-1, 2, has been reported to be more potent than resveratrol, 1, in the inhibition of lipopolysaccharide-induced expression of cyclooxygenase-2 (COX-2) and COX-2 mRNA, in vitro
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14

Pais, da Cunha Adérito Tomás. "Overcome of grape chemical barriers by the fungal pathogen Botrytis cinerea." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3425334.

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Botrytis cinerea in contact with mature grape berries encounters an environment particularly rich in polyphenols and PR proteins, where the stilbenic phytoalexin trans-resveratrol may accumulate. To mimic conditions similar to those found in grape berries, B. cinerea was grown in vitro with grape PR proteins and polyphenols extracted from mature grapes and with trans-resveratrol. Results showed that in the presence of highly toxic amounts of trans-resveratrol, grape polyphenols allowed total recovery of fungal growth, and proteins allowed partial recovery. These resveratrol-polyphenol or resve
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15

Kretzschmar, Fernanda dos Santos. "Influencia de atmosfera enriquecida em CO2, do radical oxido nitrico e de eliciadores fungicos na produção de fitoalexinas em plantulas de soja." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317714.

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Orientador: Marcia Regina Braga<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-09T08:23:11Z (GMT). No. of bitstreams: 1 Kretzschmar_FernandadosSantos_M.pdf: 1298329 bytes, checksum: ea1fc8a628a790dbf39de684ebe6192d (MD5) Previous issue date: 2007<br>Resumo: Plântulas de soja (Glycine max L. Merr), crescidas sob alta concentração de CO2 em sistema de câmaras de topo aberto apresentam incremento na fotossíntese e ganhos de produtividade, podendo alterar a produção de metabólitos secundários de importância farmacológic
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16

Veloso, Ronice Alves. "Óleos essenciais como controle alternativo de fitopatógenos." Universidade Federal do Tocantins, 2016. http://hdl.handle.net/11612/379.

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No presente estudo, foram avaliados o potencial dos óleos essenciais das espécies Cymbopogon nardus L. (Capim citronela), Copaifera sp. (Copaíba) e Ocimum basilicum L. (Manjericão) no controle de fitopatógenos associados a sementes comercializadas de manjericão; também foi determinada a composição química do óleo essencial de Morinda citrifolia L. (Noni) e sua atividade fungitóxica in vitro e in vivo no controle de fitopatógenos causadores de helmintosporiose, bem como seu potencial na indução de síntese de fitoalexinas e enzimas envolvidas nos mecanismos resistência a doenças e defesa em plan
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17

Holland, Kevin W. "Characterization and Application of Peanut Root Extracts." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/40264.

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Lipid oxidation is one of the leading causes of food quality degradation. Manufacturers typically add antioxidants or purge a productâ s package of oxygen to inhibit oxidation and the resulting off-flavors. Synthetic antioxidants (e.g. BHT, BHA) and some natural antioxidants (e.g. α-tocopherol) have found widespread use in this application. Unfortunately, the public views synthetic additives in a negative light and the current natural antioxidants have been unable to match the protection afforded by the synthetic antioxidants. The search for underutilized and natural antioxidants has led
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18

Mohammad, Ali Monadjemi Shirin. "Phototransformation de matières actives à la surface des végétaux . Mécanismes des réactions directes et sensibilisées." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00836760.

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La phototransformation des matières actives à la surface des plantes après pulvérisation a une influence considérable sur l'efficacité des traitements. Dans ce travail, l'ensemble des réactions photochimiques se produisant sur des supports modèles des cires végétales dans des conditions proches des conditions environnementales ont été étudiées dans le cas d'un fongicide (le chlorothalonil) et d'un herbicide (la cycloxydime). Nous avons considéré les réactions photochimiques induites par l'absorption de lumière par les composés eux-mêmes et celles faisant intervenir des sensibilisateurs comme l
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19

Armstrong, Gareth Owen. "The production of resveratrol by wine yeast." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52557.

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Thesis (MSc)--Stellenbosch University, 2001.<br>ENGLISH ABSTRACT: Grapevine is constantly under attack from a wide variety of pathogens including viruses, bacteria and fungi. In order to ensure survival, the grapevine has developed a vast array of defense mechanisms to combat invading organisms. A key element of this disease resistance is the production of phytoalexins, of which resveratrol is the primary component. The synthesis of resveratrol, together with other structural and biochemical defense mechanisms equips the plant to combat a number of pathogens resulting in the production
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20

Widmark, Anna-Karin. "The late blight pathogen, Phytophthora infestans : interaction with the potato plant and inoculum sources /." Uppsala : Department of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, 2010. http://epsilon.slu.se/201002.pdf.

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21

Kokubun, Tetsuo. "Phytoalexin induction in the Rosaceae." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240293.

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22

Meinerz, Cristiane Claudia. "Aspectos bioquímicos, fisiológicos e de crescimento de sorgo (Sorghum bicolor L.) tratado com extratos vegetais e fúngico." Universidade Estadual do Oeste do Paraná, 2013. http://tede.unioeste.br:8080/tede/handle/tede/1460.

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Made available in DSpace on 2017-07-10T17:40:49Z (GMT). No. of bitstreams: 1 Cristiane_Claudia_Meinerz.pdf: 1140657 bytes, checksum: 515f23cafb30196ea1e4641ed2debc7d (MD5) Previous issue date: 2013-08-30<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Induced resistance involves the activation of latent defense mechanisms existing in plants in response to treatment with biotic or abiotic agents. The use of plant extracts in order to induce resistance mechanisms is an attractive alternative to chemical control, however, these extracts may occur the presence of inducer, as
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23

Al-Barwani, Fatma Mohammed. "Phytoalexin induction in the family Umbelliferae." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250604.

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24

Dufour, Marie-Cécile. "Etude de l'efficacité des défenses de différents génotypes de Vitis induites par élicitation face à la diversité génétique de bioagresseurs (Plasmopara viticola et Erysiphe necator) : du gène au champ." Thesis, Bordeaux 2, 2011. http://www.theses.fr/2011BOR21847/document.

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La vigne est soumise à la pression de nombreux bioagresseurs dont des parasites obligatoires tels que l’oïdium et le mildiou. La lutte contre les maladies causées par les pathogènes biotrophes nécessite une utilisation souvent intensive de fongicides. Le vignoble consomme à lui seul 16% des fongicides commercialisés chaque année en France. Pour réduire leur impact environnemental qui conduit à l’acquisition de la résistance aux pesticides des pathogène et la présence de résidus dans les vins et dans l’atmosphère, des efforts doivent être entrepris pour développer des stratégies de protection i
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25

Comarella, Carine Glaucia. "ULTRASSOM NO TRATAMENTO PÓS-COLHEITA DE UVAS CULTIVAR ISABEL E CABERNET SAUVIGNON E SUA INFLUÊNCIA NA COMPOSIÇÃO DOS SUCOS." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/5721.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Phenolic compounds in plants have attracted considerable attention during the last decade due to their contribution to human health in reduce the risk of chronic diseases. The grape is one of the largest sources of these substances and like other plants, the synthesis of these compounds is usually associated with defense responses against stress factors, also called elicitors. More recently, ultrasound has been studied as possible abiotic elicitors of secondary metabolites due to mechanical stress and microstreaming induced by acou
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26

da, Cunha Antoinette. "The phytoalexin response in Phaseolus vulgaris L." Thesis, University of Oxford, 1986. https://ora.ox.ac.uk/objects/uuid:75c7c78c-1102-4bc7-8981-2f10243a9d52.

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This thesis concerns the initial events leading to the induction of the phytoalexin response in the Phaseolus vulgaris L. - Colletotrichum lindemuthianum L. host - pathogen interaction The phytoalexin response is an expression of the resistance of the host to further pathogen invasion. The visible expression of the phytoalexin response is hypersensitive necrosis. One of the initial events leading to the induction of the phytoalexin response is thought to be the induction of the first enzyme leading to the synthesis of phenylpropanoid phytoalexins, namely L-phenylalanine ammonia-lyase (PAL). St
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27

Zaharia, Lacramioara Irina. "Alternaria blackspot phytotoxins, biotransformation and phytoalexin elicitation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63941.pdf.

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28

Whitehead, Ian Michael. "Enzymological aspects of phytoalexin accumulation in Phaseolus vulgaris." Thesis, Royal Holloway, University of London, 1986. http://repository.royalholloway.ac.uk/items/836b02ce-490e-4f74-baad-76d3478b746a/1/.

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In wounded cotyledons of Phaseolus vulgaris the accumulation of the 5-hydroxy isoflavonoids 21-hydroxygenistein and kievitone preceded the major increases in the levels of the 5-deoxy compounds coumestrol and phaseollin. Increased phytoalexin (kievitone and phaseollin) levels werepreceded by transient increases in the extractable activities of L-phenyl-alanine ammonia-lyase (EC 4.3.1.5), chalcone synthase and chalcone isomerase (EC 5.5.1.6). 13C-NMR analysis of kievitone and phaseollin produced after feeding [l,2-13C2] acetate to wounded cotyledons demonstrated the incorporation of intact acet
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29

Meinerz, Cristiane Claudia. "Indução de mecanismos bioquímicos de defesa em sorgo (Sorghum bicolor) por frações obtidas do decocto de avenca (Adiantum capillus-veneris)." Universidade Estadual do Oeste do Paraná, 2010. http://tede.unioeste.br:8080/tede/handle/tede/1413.

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Made available in DSpace on 2017-07-10T17:37:44Z (GMT). No. of bitstreams: 1 Cristiane_Claudia_Meinerz.pdf: 977726 bytes, checksum: 47602589d307d4398cc6061bcd0d1eeb (MD5) Previous issue date: 2010-02-24<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Induction of resistance involves the activation of plant defense mechanisms in response to treatment with biotic or abiotic elicitors. The application of plant extracts in order to induce resistance mechanisms is an interesting alternative to chemical control, however, besides the presence of inducers, can occur the presence
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30

Priestley, R. A. "Phytoalexin synthesis in aggregated suspension cultures of Phaseolus vulgaris." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382750.

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31

Kroon, Paul Anthony. "Regulation of phytosterol and phytoalexin biosynthesis in plant tissue cultures." Thesis, University of Hull, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262429.

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32

Bellow, Sébastien. "Etude des composés phénoliques impliqués dans la réponse des feuilles de vigne au mildiou." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00744468.

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Maîtriser l'impact des maladies sur les cultures est un défi majeur de l'agriculture moderne. Cette préoccupation est un aspect important de l'optimisation de la productivité, notamment en viticulture. En France, le mildiou de la vigne causé par Plasmopara viticola est une des maladies cryptogamiques responsable des épidémies les plus dévastatrices et les plus redoutées. Les traitements reposent sur l'utilisation préventive, systématique et onéreuse de composés chimiques antifongiques dont l'utilisation massive constitue un risque à la fois pour l'homme et l'environnement. La réduction de l'ut
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33

Coleman, Mark John. "Studies of fungal elicitors that induce phytoalexin synthesis in Phaseolus vulgaris." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46724.

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34

Douillet-Breuil, Anne-Céline. "Les phytoalexines de la vigne : synthèse, métabolisme par botrytis cinerea, activités biologiques." Dijon, 1999. http://www.theses.fr/1999DIJOS070.

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Les phytoalexines jouent un rôle majeur dans l'interaction vigne-botrytis cinerea. Le premier travail présenté concerne l'identification des métabolites produits par l'action de B. Cinerea sur le resveratrol et le ptérostilbène qui sont des phytoalexines chez la vigne. Ces résultats ont permis d'établir une méthode d'analyse par CLHP des principaux composés de type phytoalexine. Sont proposés simultanément une identification et une quantification par détection par barrettes de diodes et fluorimétrique de ce type de stilbènes. Par cette méthode, une évaluation et une comparaison du potentiel de
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35

Rizkita, R. E. "A study of the factors affecting phytoalexin production in tissues of lucerne." Thesis, Swansea University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638672.

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The pathogenicity of two isolates of the fungus <i>Verticillium albo-atrum</i> obtained either from lucerne (V1) or tomato(V2) towards four cultivars of lucerne (<i>Medicago sativa</i>.L), namely Maris Kabul, Europe, Vela, and Euver was investigated. The results confirmed that only the V1 isolate is capable of causing wilt disease in these four cultivars. A degree of resistance was observed, however, and of all cultivars Maris Kabul showed the highest degree of resistance. Following pathogenicity testing, production of the phytoalexin medicarpin, synthesis of which is preceeded by an increase
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36

Baisden, Jared T. "Isolation and Characterization of a Suspected Phytoalexin from Wilted Red Maple Leaves." Ashland University Honors Theses / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=auhonors1367972336.

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37

Commun, Katia. "Etude du comportement des proplastes de vigne au cours des phases d'isolement et de culture : incidence des facteurs du milieu et caractérisation de la production de phytoalexines." Reims, 2001. http://www.theses.fr/2001REIMS032.

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38

Ressler, Daniel. "Synthesis of Resveratrol Ester Derivatives." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etd/1234.

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The goal of this research project was to synthesize derivatives of transresveratrol. In order for resveratrol to be activated and used by the body it needs to bind to Human Serum Albumin (HSA), a protein in blood plasma. The derivatives were synthesized to improve the ability of resveratrol to enter cells as well as improve their ability to bind to HSA. The three derivatives that were synthesized have converted one of the hydroxyl groups on resveratrol to an ether with a methylene chain terminated by a carboxylic acid. By varying the lengths of the methylene chain we varied the water solubilit
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39

Jeandet, Philippe. "Interaction plante-pathogène : recherches sur la production de resvératrol (3,5,4-trihydroxystilbène), une phytoalexine de la vigne." Dijon, 1991. http://www.theses.fr/1991DIJOS006.

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La production du resvératrol (trans-3,5,4-trihydroxystilbène), une phytoalexine de la vigne liée à la résistance à la pourriture grise (Botrytis cinerea) a été étudiée dans ce travail. Après avoir mis au point la synthèse du resvératrol et son dosage par chromatographie en phase gazeuse, la production de cette molécule chez la vigne a été analysée. Le resvératrol est synthétisé par les baies de raisins en réponse à divers types d'éliciteurs naturels ou abiotiques mais cette aptitude décroit régulièrement jusqu'à la maturité des fruits. Cette décroissance peut expliquer la sensibilité élevée de
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Pasturel, Yacine. "Resvératrol : Synthèse et analogues." Université Louis Pasteur (Strasbourg) (1971-2008), 2001. http://www.theses.fr/2001STR13200.

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Le Resvératrol (3,4',5-trihydroxystilbène) est une phytoalexine, présente en quantité importante dans la peau du raisin, et isolée dans plus de 70 espèces de plantes. A cause de ses propriétés antioxydantes, les chercheurs supposent qu'il diminue les risques de maladies cardiovasculaires, moyennant une consommation modérée de vin rouge. Il possède des propriétés antimutagèniques, antivirales, de chemoprévention du cancer, antiallergiques et phytoestrogènes. Nous avons préparé le Resvératrol par réaction de Perkin. La réaction de condensation est suivie d'une décarboxylation, d'une isomérisatio
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DELAMARCHE, ISABELLE. "Synthese totale des phytoalexines furanoacetyleniques de la feverole vicia faba de certains analogues structuraux." Rennes 1, 1993. http://www.theses.fr/1993REN10109.

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Nous decrivons dans ce memoire la synthese totale de phytoalexines isolees chez la feverole. Nous avons developpe une nouvelle synthese efficace de ces composes a partir d'un produit commercial bon marche: le furfural, ce qui nous a permis de les preparer en quantites substantielles. Cette synthese met en valeur l'utilisation de n-methoxy-n-methylamides acetyleniques comme agents acylants permettant l'introduction directe de la chaine laterale carbonylee. Une voie optimale pour preparer le wyerone epoxyde a ete mise au point au moyen du dimethyldioxirane. Cette methode de synthese apparait de
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Veenstra, Amy. "Evaluation of southern African maize germplasm for phytoalexin accumulation following inoculation by Fusarium verticillioides." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/27095.

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Maize is a socially and economically important crop in Africa (and worldwide) that is severely affected by many fungal pathogens. The pathogen Fusarium verticillioides causes Fusarium ear rot in maize, a disease that greatly reduces quantity and quality of annual maize yields. The pathogen produces mycotoxins called fumonisins, which have been linked to adverse health effects in both humans and animals. Maize produces terpenoid phytoalexins, which are antimicrobial compounds that directly reduce the growth of many fungal pathogens including F. verticillioides. Two families of maize phytoalexin
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Degousée, Norbert. "Etude du rôle de phénomènes d'oxydation dans l'induction de la synthèse des phytoalexines du soja." Toulouse 3, 1993. http://www.theses.fr/1993TOU30189.

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Le traitement d'axes hypocotyles de soja (glycine max. L. Var. Soriano) par des molecules oxydantes comme des hydroperoxydes ou des reactifs de thiols conduit a l'accumulation de phytoalexines, les glyceollines. Une etude a ete conduite afin de determiner si des phenomenes d'oxydation tels que l'oxydation des groupements sulfhydriles cellulaires ou la peroxydation lipidique pouvaient rendre compte du declenchement de ce metabolisme de defense. Les resultats montrent que la modification des teneurs en groupements sulfhydriles reduits proteiques et non proteiques n'est pas un evenement directeme
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Henneken, Michael. "HPLC-Analyse von Phytoalexinen zur Differenzierung von Camelina-sativa-(L.)-Crtz.-Sorten." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964465523.

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Sellam, Adnane. "Etude du déterminisme moléculaire du pouvoir pathogène d'Alternaria brassicicola, l'agent du black spot des crucifères." Angers, 2006. http://www.theses.fr/2006ANGE0027.

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Nous nous sommes intéressés à l’étude des mécanismes de détournement des défenses chimiques des plantes hôtes (phytoanticipines et les phytoalexines) dans le but d’identifier de potentiels déterminants du pouvoir pathogène chez Alternaria brassicicola. Les effets antimicrobiens des isothiocyanates (ITC) et des phytoalexines indoliques de crucifères sur différents paramètres de croissance de plusieurs souches d’A. Brassicicola ont tout d’abord été étudiés. Les résultats obtenus confirment l’effet inhibiteur des métabolites testés en particulier sur la germination des conidies et l’élongation de
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Alignan, Marion Barrault Gérard. "Phoma du tournesol déterminisme de la tolérance de l'hôte à la maladie /." Toulouse : INP Toulouse, 2006. http://ethesis.inp-toulouse.fr/archive/00000297.

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Boyce, Antony. "Modulation of the genetic toxicology of the food-derived heterocyclic amines by the phytoalexin resveratrol." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421308.

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Pageni, Parasmani. "Synthesis of Ester Derivatives of Resveratrol as Potential Anti-Cancer Drugs." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etd/1181.

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Resveratrol is a naturally occurring phytoalexin of the stilbene family produced by various plants in response to stress, UV radiation, and fungal attack. It is primarily found in peanuts, berries, grape skin, and red wine. Resveratrol has been found to exhibit anti-cancer, anti-inflammatory, anti-aging, and anti-oxidant properties. Research indicates that diets enriched with resveratrol containing substances result in less incidence of cancer. Unfortunately, the low bioavailability and solubility has been a huge setback for its potential prospects. As a result, efforts have been made to synth
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HAUDENSCHILD, CHRISTIAN. "Role des sterols au cours de l'elicitation de la synthese des phytoalexines dans des suspensions cellulaires vegetales." Université Louis Pasteur (Strasbourg) (1971-2008), 1995. http://www.theses.fr/1995STR13155.

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Ce travail comporte deux parties principales, la premiere s'interessant au role des sterols au cours de l'elicitation de la biosynthese des phytoalexines par un extrait de paroi de phytophthora megasperma dans des suspensions cellulaires de soja et de persil, l'autre s'interessant a leur metabolisme dans les memes conditions. Les principaux resultats de la premiere partie montrent d'une part, que des cellules possedant des membranes appauvries en sterols par un inhibiteur de la biosynthese des sterols repondent normalement a l'addition de l'eliciteur, et d'autre part, que des cellules presenta
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Ricci, Pierre. "Étude des relations hôte-parasite dans l'interaction compatible entre Dianthus caryophyllus L. Et phytophthora parasitica Dastur. : nature et intervention d'un mécanisme de défense élicitable." Paris 11, 1986. http://www.theses.fr/1986PA112355.

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Ce travail décrit le parasitisme, par des clones de P. Parasitica d’agressivités diverses, de boutures d’œillet (Dianthus caryophyllus) sensibles. L’analyse quantitative de l’interaction hôte-parasite selon le modèle de SHORTLEY et WILKINS montre qu’une colonisation précoce du site inoculé est déterminante pour le succès de l’infection et suggère l’intervention d’une réaction local de défense des tissus-hôtes, dont le support moléculaire est étudié. Un extrait hydrosoluble de la paroi fongique induit une protection des boutures, corrélée à l’accumulation de dérivés N-benzoylanthraniliques nouv
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