Phytoalexins in orchids

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August undefined, 2024

WebbOrchid phytoalexins inhibit a number of fungi and bacteria at concentrations from 10-4 to 10-2 M. In Orchis militaris, ORC may reach a level of 0.5 X 10-2 M in tissues 8 days following infection with Rhizoctonia repens (NUESCH 1963). This con-centration is well within the toxic range for some bacteria and fungi, but its effects on orchid seed- WebbThe handbook Orchids Phytochemistry, Biology and Horticulture is a reference for biotechnological applications. Deals extensively with research and uses. Orchids …

ORCHIDS - MYCORRHIZAE

Webb29 jan. 2007 · Orchids are known to produce various phenolic compounds and phytoalexins, which were shown to suppress a number of different microorganisms … WebbPhytoalexins are synthesized in live cells but cell necrosis follows very quickly possibly within minutes. Most phytoalexins are derived from one or other or combination of three major biosynthetic pathways (shikimic acid pathway, acetate-malonate pathway and acetate-mevalonate pathway). inspirational and motivational messages

Phytoalexins in Orchids - ResearchGate

WebbOne of the best and longest-studied defense response of plants to infection is the induced accumulation of antimicrobial, low-molecular-weight secondary metabolites known as phytoalexins. Since the phytoalexin hypothesis was first proposed in 1940, a role for these compounds in defense has been reve … Webbphytoalexins have been examined for over 70 years, yet many aspects of their occurrence, synthesis and function remain poorly described (Hammerschmidt, ... orchids, gingers and lilies to onions and grasses, to date only the Poaceous genera Oryza and Zea have been unequivocally demonstrated to contain terpenoid phytoalexins. Harborne (1999) noted a WebbPhytoalexins are antimicrobial low-molecular-weight compounds (secondary metabolites) that are synthesized de novo following pathogenic attack ( Bailey & Mansfield, 1982). Hundreds of phytoalexins have been characterized. They are especially widespread in the Fabaceae (Leguminosae) and Solanaceae but are also found in about 15 other families. inspirational and motivational sayings

Bacteria associated with orchid roots and microbial

Phytoalexins in orchids

Webb20 maj 2024 · In order to defense, plants produce low molecular weight secondary metabolites which were later known as “Phytoalexins”. These molecules have vast therapeutic potential also. Purpose: The purpose of this review is to explore the phytoalexins and their pharmacological effects. Webb21 nov. 2012 · This orchid species is traditionally used in Indian subcontinent as a stimulant and tonic in aged patients suffering from persistent diseases, like asthma, …

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Webb4 jan. 2024 · Phytoalexins (Phyto = “plant” and alexin = “to ward off/”) Low molecular mass antimicrobial compounds that are produced by plants as a response to biotic and abiotic stresses • Many phytoalexins have been … Webb1 juli 2016 · Phytoalexins are the simplest antimicrobial produced in response to pathogen invasion by the microorganism, however, in some cases, they may be elicited by positive …

Webbthat orchids have specialized cells and structures for mycorrhizae. In adult plants, much of the plant body contains antifungal phytoalexins (Hadley, 1982) and this is presumably … Webb5 aug. 2011 · Nonvolatile terpenoid phytoalexins occur throughout the plant kingdom, but until recently were not known constituents of chemical defense in maize (Zea mays). We describe a novel family of ubiquitous maize sesquiterpenoid phytoalexins, termed zealexins, which were discovered through characterization of Fusarium graminearum …

Webb1 juni 2013 · Phytoalexins identified in the cereal food Poaceae include the momilactones, oryzalexins, phytocassanes and sakuranetin from rice; the kauralexins and zealexins from maize; and the 3-deoxyanthocyanidins from sorghum. These phytoalexins are known to exhibit considerable antimicrobial activities against a wide array of pathogenic fungi and … Webb3 juni 2024 · Phytoalexins are diverse secondary metabolites of plants that are biosynthesized transiently and in relatively low amounts in response to pathogens and …

WebbPhytoalexins are synthesized in almost every part of orchid plant such as roots, rhizomes, and bulbs as soon as they are invaded by any fungus as observed in Bletila striata, which …

WebbPhytoalexins tend to fall into several chemical classes, including terpenoids, glyco steroids and alkaloids, however the term applies to any phytochemicals that are induced by … inspirational and self improvement booksWebb9,10-Dihydrophenanthrenes as Phytoalexins of Orchidaceae Biosynthetic Studies in vitro and in vivo Proving the Route from l -Phenylalanine to Dihydro- m -coumaric Acid, … inspirational and motivational articlesWebbThe phytoalexin sakuranetin (flavonoid) is an antifungal compound present in the leaves of black currant, and in rice leaves, they are induced at the moment of the pathogen attack ( KODAMA et al., 1992 ). Characterization and methods of detection of phytoalexins NUGROHO et al. (2002 inspirational and motivational poemsWebb8 apr. 2024 · Terpenes, especially volatile terpenes, are important components of tea aroma due to their unique scents. They are also widely used in the cosmetic and medical industries. In addition, terpene emission can be induced by herbivory, wounding, light, low temperature, and other stress conditions, leading to plant defense responses and … inspirational and motivational songsWebb22 dec. 1993 · Analysis of elicitation in various orchids by applying anti- bibenzyl synthase antibodies and the immunological simil- arities between orchid bibenzyl synthases … jesuits at fordhamWebb31 aug. 2016 · Phytoalexins In their natural environment, orchids are naturally exposed to many micro-organisms, and in response to such microbial challenge they produce … jesuits central and southernWebb1 jan. 2024 · Phytoalexins are chemically diverse and low-molecular-weight substances produced in response to pathogen infection. Most of the phytoalexins are synthesized though shikimic acid ... (Tillandsia usneoides), cacti, orchids, Agave, and wax plant (Hoya carnosa, family Apocynaceae). Ward et al. (1975) Methylated phenolic compounds ... inspirational animal pictures