Academic literature on the topic 'Phytoalexins'

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Journal articles on the topic "Phytoalexins"

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Ingham, John L. "A Further Investigation of Phytoalexin Formation in the Genus Trifolium." Zeitschrift für Naturforschung C 45, no. 7-8 (1990): 829–34. http://dx.doi.org/10.1515/znc-1990-7-814.

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Abstract An earlier study of phytoalexin formation in the genus Trifolium has now been extended to include a further 61 species and subspecies. Using the drop-diffusate method, isoflavonoid phytoalexins were isolated from the fungus-inoculated leaflets of 55 accessions, whilst four others produced the stilbene derivative resveratrol. Phytoalexins could not be obtained from the leaflets of two species, T. billardieri and T. grandiflorum. The pterocarpan medicarpin was the most commonly encountered phytoalexin, occurring alone or in various combinations with the known Trifolium isofjavonoids maa
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Mamman, Muazu, H. A. Muhammed, I. I. Akowe, S. Abdulhakeem, and J. Iyaji. "Biosynthesis, Accumulation, and Antimicrobial Potential of Phytoalexin and Natural Product in Plant and Animal Defense System." RADINKA JOURNAL OF SCIENCE AND SYSTEMATIC LITERATURE REVIEW 2, no. 3 (2024): 442–49. https://doi.org/10.56778/rjslr.v2i3.335.

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ABSTRACT Most plant potential to resist pathogenic infections requires some sophisticated defense system which basically involves the production of low-molecular-weight antimicrobial metabolites known as phytoalexins. These compounds are known to exhibit toxicity towards a wide spectrum of pathogens, such as ffungi, bacteria, nematodes, and other organisms. This review delves into the diverse chemical structures and biosynthetic pathways of phytoalexins across various plant familie and some higher animals human alike. We examine the mechanisms of phytoalexin accumulation, through de novo synth
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Gross, Dieter, Andrea Porzel, and Jürgen Schmidt. "Phytoalexine mit Indolstruktur aus Kohlrabi {Brassica oleracea var. gongylodes)+ / Indole Phytoalexins from the Kohlrabi (Brassica oleracea var. gongylodes)+." Zeitschrift für Naturforschung C 49, no. 5-6 (1994): 281–85. http://dx.doi.org/10.1515/znc-1994-5-601.

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Abstract UV-irradiation of sliced stem tubers of kohlrabi (Brassica oleracea var. gongylodes) followed by incubation for 4 days, resulted in the production of two new sulphur-containing indole phytoalexins, cyclobrassinone and 1 -methoxyspirobrassinin, whose structures were elucidated on the basis of spectroscopic data. Three known indole phytoalexins, spirobrassinin, methoxybrassitin and methoxybrassinin, and several m inor phytoalexin-like compounds not yet identified were also isolated. The accumulation of these indole phytoalexins was also induced by abiotic elicitation with CuCl2. Feeding
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Jeandet, Philippe, Patricia Trotel-Aziz, Cédric Jacquard, et al. "Use of Elicitors and Beneficial Bacteria to Induce and Prime the Stilbene Phytoalexin Response: Applications to Grapevine Disease Resistance." Agronomy 13, no. 9 (2023): 2225. http://dx.doi.org/10.3390/agronomy13092225.

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Phytoalexins are naturally occurring molecules with antimicrobial activity deriving from the secondary metabolism of plants; they are synthesized in response to physical agents or stresses and phytopathogenic agents (fungi, bacteria and viruses), as well as numerous chemical compounds and biological control agents. Among these, grapevine phytoalexins, which belong to the chemical group of stilbenes, exhibit biocidal activity against a large number and variety of plant pathogens. It is important to investigate whether induction of stilbene phytoalexin production can serve to protect this plant
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Storck, Michael, and Maria D. Sacristán. "The Role of Phytoalexins in the Seedling Resistance to Leptosphaeria maculans in Some Crucifers." Zeitschrift für Naturforschung C 50, no. 1-2 (1995): 15–20. http://dx.doi.org/10.1515/znc-1995-1-204.

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Abstract Brassica juncea, Brassica carinata and Sinapis arvensis resistant lines to Leptosphaeria maculans and four Brassica napus cuitivars susceptible to this pathogen in seedling stage were analyzed in relation to the accumulation of phytoalexins after inoculation with L. maculans. Cotyledon inoculations with spore suspensions of an aggressive and a non-aggressive isolate of L. maculans were performed on seedlings of these lines. The quantity of accumulated phytoalexins in the cotyledons was determined at different time intervals after inoculation. The content and composition of phytoalexin
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Mohanty, B., S. M. Basha, D. W. Gorbet, R. J. Cole, and J. W. Dorner. "Variation in Phytoalexin Production by Peanut Seed from Several Genotypes1." Peanut Science 18, no. 1 (1991): 19–22. http://dx.doi.org/10.3146/i0095-3679-18-1-7.

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Abstract Evaluation of twenty peanut (Arachis hypogaea L.) genotypes for their phytoalexin producing ability showed wide variation in the amount and composition of phytoalexins produced. Some genotypes produced one major phytoalexin component while the other genotypes produced seven major phytoalexin components. In addition, high phytoalexin producing genotypes utilized more methionine-rich protein than the low phytoalexin producing genotypes suggesting that methionine-rich protein or its breakdown products may have a role in phytoalexin production.
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Fawe, A., M. Abou-Zaid, J. G. Menzies, and R. R. Bélanger. "Silicon-Mediated Accumulation of Flavonoid Phytoalexins in Cucumber." Phytopathology® 88, no. 5 (1998): 396–401. http://dx.doi.org/10.1094/phyto.1998.88.5.396.

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The controversial role of silicon in plant disease resistance, described mostly as a passive mechanical protection, has been addressed. Conclusive evidence is presented that silicon is involved in the increased resistance of cucumber to powdery mildew by enhancing the antifungal activity of infected leaves. This antifungal activity was attributable to the presence of low-molecular-weight metabolites. One of these metabolites, described here as a phytoalexin, was identified as a flavonol aglycone rhamnetin (3,5,3′,4′-tetrahydroxy-7-O-methoxyflavone). This is the first report of a phytoalexin fo
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Monsalvo, Ivan, Leonardo Parasecolo, Sarah Pullano, et al. "ANAC042 Regulates the Biosynthesis of Conserved- and Lineage-Specific Phytoalexins in Arabidopsis." International Journal of Molecular Sciences 26, no. 8 (2025): 3683. https://doi.org/10.3390/ijms26083683.

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Phytoalexins are specialized metabolites that are synthesized by plants in response to pathogens. A paradigm in transcription factor (TF) biology is that conserved TFs have dedicated roles across plant lineages in regulating specific branches of specialized metabolism. However, the Arabidopsis (Arabidopsis thaliana) NAC family TF ANAC042 (a.k.a. JUNGBRUNNEN1 or JUB1) regulates the synthesis of camalexin, a Trp-derived phytoalexin specifically produced by several Brassicaceae species, whereas its homolog in soybean (Glycine max) regulates the synthesis of glyceollins, which are Phe-derived phyt
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Thynn, M., A. Wolff, E. Gorge, and D. Werner. "Low Concentrations of Phytoalexins Correlate with Resistance in Regenerated Plants from Meristem Cultures of Vicia faba L." Zeitschrift für Naturforschung C 44, no. 3-4 (1989): 237–42. http://dx.doi.org/10.1515/znc-1989-3-411.

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Abstract In tissue cultures from shoot apex meristems with leaf primordias of Vicia faba cv. TP667, addition of low concentration of auxins (0.01 mg ・1-1) induced regeneration of whole plants at high frequency (100%). The combination of NAA and kinetin or GA , also induced a high yield of plant regeneration. Regenerated plants from various cultivars on a medium with 2 ,4 D (0.01 mg ・1-1) were infected with Botrytis cinerea, Phytophthora megasperma and R hizoctonia solani. Accumulation of phytoalexins, ethylene production and the resistance to fungal diseases were studied. In general, productio
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Klein, Andrew P., and Elizabeth S. Sattely. "Biosynthesis of cabbage phytoalexins from indole glucosinolate." Proceedings of the National Academy of Sciences 114, no. 8 (2017): 1910–15. http://dx.doi.org/10.1073/pnas.1615625114.

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Brassicacrop species are prolific producers of indole–sulfur phytoalexins that are thought to have an important role in plant disease resistance. These molecules are conspicuously absent in the model plantArabidopsis thaliana, and little is known about the enzymatic steps that assemble the key precursor brassinin. Here, we report the minimum set of biosynthetic genes required to generate cruciferous phytoalexins starting from the well-studied glucosinolate pathway. In vitro biochemical characterization revealed an additional role for the previously described carbon–sulfur lyase SUR1 in process
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Dissertations / Theses on the topic "Phytoalexins"

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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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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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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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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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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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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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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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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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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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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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Books on the topic "Phytoalexins"

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Dr, Daniel M., and Purkayastha R. P. 1935-, eds. Handbook of phytoalexin metabolism and action. M. Dekker, 1995.

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Pontzen, Rolf. Untersuchungen zum Einfluss von Glucanen und Mannanen aus Phytophthora megasperma f. sp. glycinea auf die Akkumulation des Phytoalexins Glyceollin in Sojabohnen. [s.n.], 1985.

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Thalmann, Ernst. Bedeutung der Glykoalkaloide und Phytoalexine für das Resistenzverhalten der Kartoffelknolle gegen Phytophthora infestans (Mont.) de bary. [s.n.], 1987.

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O'Neill and Harborne. Phytoalexins. University of Cambridge ESOL Examinations, 2002.

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Mycotoxins and phytoalexins. CRC Press, 1991.

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Phytoalexins: Current Progress and Future Prospects. MDPI, 2015. http://dx.doi.org/10.3390/books978-3-03842-059-0.

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Su, Hong. Isolation, purification, and structure elucidation of hop plant elicitor. 1992.

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Structure, Chemical Analysis, Biosynthesis, Metabolism, Molecular Engineering and Biological Functions of Phytoalexins. MDPI, 2018. http://dx.doi.org/10.3390/books978-3-03842-756-8.

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Jeandet, Philippe. Structure, Chemical Analysis, Biosynthesis, Metabolism, Molecular Engineering and Biological Functions of Phytoalexins. Mdpi AG, 2018.

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Handbook of Phytoalexin Metabolism and Action. CRC Press LLC, 1995.

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Book chapters on the topic "Phytoalexins"

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Kaur, Saranjeet. "Phytoalexins in Orchids." In Reference Series in Phytochemistry. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-38392-3_28.

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Keen, N. T. "Phytoalexins and Their Elicitors." In ACS Symposium Series. American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0439.ch006.

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West, Charles A., Augusto F. Lois, Karen A. Wickham, and Yue-Ying Ren. "Diterpenoid Phytoalexins: Biosynthesis and Regulation." In Biochemistry of the Mevalonic Acid Pathway to Terpenoids. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-8789-3_6.

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Paxton, Jack D. "Fungal Elicitors of Plant Phytoalexins." In Handbook of Natural Toxins. CRC Press, 2024. https://doi.org/10.1201/9781003573760-25.

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Sheikh, Sana, Sareen Sheikh, Jyothi Miranda, Vishal Moger, V. S. Swaroop Kumar, and Jayalaxmi. "Role of Phytoalexins in Agriculture." In Antimicrobials in Agriculture. CRC Press, 2024. http://dx.doi.org/10.1201/9781003268895-3.

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Dixon, R. A., P. M. Dey, and C. J. Lamb. "Phytoalexins: Enzymology and Molecular Biology." In Advances in Enzymology - and Related Areas of Molecular Biology. John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/9780470123010.ch1.

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Stuart, Jeffrey A., and Ellen L. Robb. "Resveratrol and Its Derivatives as Phytoalexins." In Bioactive Polyphenols from Wine Grapes. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6968-1_1.

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Strange, R. N. "High Performance Liquid Chromatography of Phytoalexins." In High Performance Liquid Chromatography in Plant Sciences. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82951-2_9.

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Elakovich, Stella D. "Sesquiterpenes as Phytoalexins and Allelopathic Agents." In ACS Symposium Series. American Chemical Society, 1987. http://dx.doi.org/10.1021/bk-1987-0325.ch007.

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Pedras, M. Soledade C., Abdul Q. Khan, and Janet L. Taylor. "Phytoalexins from Brassicas: Overcoming Plants' Defenses." In Phytochemicals for Pest Control. American Chemical Society, 1997. http://dx.doi.org/10.1021/bk-1997-0658.ch012.

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Conference papers on the topic "Phytoalexins"

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Kim, Hyo Jung, Chae Lim Jung, Dae Hwan Nam, et al. "Abstract 4243: Potential protective role of phytoalexins derived from soybean by biotic elicitor on inflammatory mechanism." In Proceedings: AACR 102nd Annual Meeting 2011‐‐ Apr 2‐6, 2011; Orlando, FL. American Association for Cancer Research, 2011. http://dx.doi.org/10.1158/1538-7445.am2011-4243.

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Romero Sierra, Curro, and Víctor Miguel Frías Martínez. "Determinación de la actividad de la enzima Fenilalanina Amonio Liasa (PAL) en muestras vegetales tratadas con Brotomax®." In II CONGRÉS DE LA TOMATA VALENCIANA: L'AUTÈNTICA. Universitat Politècnica de València, 2024. http://dx.doi.org/10.4995/tomaval2024.2024.18665.

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Secondary metabolites in plants are organic molecules that fulfil non-essential but necessary functions. Among these, phenolic compounds or phenylpropanoids play a fundamental role. They are biochemically modulated and synthesised via two principal pathways, the shikimic acid pathway and, to a lesser extent, the malonic acid pathway. The enzyme Phenylalanine Ammonium Lyase (PAL) is found in the shikimic acid pathway and is responsible for naturally synthesising polyphenols, phytoalexins and phytotoxins in plants. The results obtained by the Spanish National Research Council (CSIC) show how app
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Mezencev, Roman, and John F. McDonald. "Abstract 1292: Camalexin, an indole phytoalexin from Arabidopsis thaliana, displays activity against ovarian cancer stem cells." In Proceedings: AACR 107th Annual Meeting 2016; April 16-20, 2016; New Orleans, LA. American Association for Cancer Research, 2016. http://dx.doi.org/10.1158/1538-7445.am2016-1292.

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Smith, Basil A. "Abstract 542: Camalexin, the phytoalexin fromCruciferous Plants, decreases cell proliferation and induces apoptosis in prostate cancer cells." In Proceedings: AACR 103rd Annual Meeting 2012‐‐ Mar 31‐Apr 4, 2012; Chicago, IL. American Association for Cancer Research, 2012. http://dx.doi.org/10.1158/1538-7445.am2012-542.

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Walker, Rashidra R., Jankiben Patel, A. Michael Davidson, and Syreeta L. Tilghman. "Abstract 4116: A novel phytoalexin, glyceollins, trigger anti-proliferative and apoptotic effects in aromatase inhibitor resistant breast cancer cells." In Proceedings: AACR Annual Meeting 2020; April 27-28, 2020 and June 22-24, 2020; Philadelphia, PA. American Association for Cancer Research, 2020. http://dx.doi.org/10.1158/1538-7445.am2020-4116.

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Walker, Rashidra R., Jankiben Patel, A. Michael Davidson, Karen Gallegos, and Syreeta L. Tilghman. "Abstract P3-11-15: A novel phytoalexin, glyceollins, trigger anti-proliferative effects in aromatase inhibitor resistant breast cancer cells." In Abstracts: 2019 San Antonio Breast Cancer Symposium; December 10-14, 2019; San Antonio, Texas. American Association for Cancer Research, 2020. http://dx.doi.org/10.1158/1538-7445.sabcs19-p3-11-15.

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Sirerol, J. Antoni, Ines Pulido, Miguel Asensi, Angel Ortega, and Jose M. Estrela. "Abstract 1605: Pterostilbene, a natural phytoalexin, effectively protects against UVB-induced skin carcinogenesis by increasing antioxidant cellular defenses and preventing mutagenesis." In Proceedings: AACR Annual Meeting 2014; April 5-9, 2014; San Diego, CA. American Association for Cancer Research, 2014. http://dx.doi.org/10.1158/1538-7445.am2014-1605.

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Benlloch, Maria, Soraya L. Valles, Maria L. Rodriguez, et al. "Abstract 2810: Pterostilbene, a natural phytoalexin, weakens the antioxidant defenses of aggressive cancer cells in vivo: a pituitary gland- and Nrf2-dependent mechanism." In Proceedings: AACR 107th Annual Meeting 2016; April 16-20, 2016; New Orleans, LA. American Association for Cancer Research, 2016. http://dx.doi.org/10.1158/1538-7445.am2016-2810.

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Reports on the topic "Phytoalexins"

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VanEtten, Hans. Final Report: Tolerance to phytoalexins and its implication for the evolution of host specific virulence traits, July 1, 1996 - June 30, 1998. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/756732.

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VanEtten, H. Phytoalexin detoxification genes and gene products: Implication for the evolution of host specific traits for pathogenicity. Final report. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/491534.

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Kapulnik, Yoram, and Donald A. Phillips. Isoflavonoid Regulation of Root Bacteria. United States Department of Agriculture, 1996. http://dx.doi.org/10.32747/1996.7570561.bard.

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The overall objective of this project was to develop a conceptual framework for enhancing root colonization by beneficial bacteria. To accomplish this aim we tested the hypothesis that production and excretion of the plant phytoalexin medicarpin can be used for creation of a special niche along the legume roots, where beneficial microorganism, such as rhizobium, will have a selective advantage. On the Israeli side it was shown that higher medicarpin levels are exuded following the application of Rhizobium meliloti to the rhizosphere but the specific biochemical pathway governing medicarpin pro
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Chalutz, Edo, Charles Wilson, Samir Droby, et al. Induction of Resistance to Postharvest Diseases and Extension of Shelf-Life of Fruits and Vegetables by Ultra-Violet Light. United States Department of Agriculture, 1994. http://dx.doi.org/10.32747/1994.7568093.bard.

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Abstract:
Following preliminary observations by one of the collaborating scientists on this project and the completion of a 1-year, BARD-supported feasibility study (IS-1908-90F), this 3-year BARD project has been executed. The main objectives of the research were to elucidate biochemical and pathological aspects of UV-induced resistance in fruits and vegetables, to characterize physical and biological variables of induced resistance and delay of ripening, and to explore the application of the treatment as a control practice of postharvest diseases and shelf-life extension of fruits and vegetables. Our
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