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Pseudomonas aeruginosa W51D used citronellol (3,7-dimethyl-6-octen-1-ol) as sole source of carbon and oxidized it to citronellal, citronellic acid and finally to geranic acid. A mutant derived from this strain was isolated as unable to degrade citronellol and had diminished (93%) citronellal dehydrogenase activity. 相似文献
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H P SINGH DAIZY R BATISH S KAUR H RAMEZANI R K KOHLI 《The Annals of applied biology》2002,141(2):111-116
The effect of four monoterpenes ‐ citronellol, citronellal, cineole and linalool ‐ on the germination, growth and physiology of Cassia occidentalis was investigated. All four monoterpenes reduced germination of C. occidentalis seeds but to varying extents. Citronellal and linalool completely inhibited germination beyond the concentrations of 55 and 110 μM, respectively, whereas in response to treatment of citronellol no germination was observed beyond 330 μM. Further, the growth of seedlings, measured in terms of seedling length and biomass, was also adversely affected. A reduction in chlorophyll content of the cotyledonary leaves of C. occidentalis was also noticed, indicating an adverse effect on photosynthesis. Likewise, respiratory ability of growing seeds was also impaired in response to all four monoterpenes, clearly indicating that monoterpenes affect energy metabolism. On the basis of overall phytotoxicity, potency of monoterpenes was in the order of citronellal > linalool > citronellol > cineole. The results from this study suggest that both citronellal and linalool possess strong phytotoxic potential and can thus serve as lead molecules for the synthesis of bioherbicides. 相似文献
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Andr Müller Bernhard Hauer Bettina Rosche 《Journal of Molecular Catalysis .B, Enzymatic》2006,38(3-6):126-130
Bacteria, yeasts and filamentous fungi were screened for enantio-specific reduction of the α, β-unsaturated carbon bond in citral to produce citronellal. While a traditional aqueous screening system revealed only Zymomonas mobilis as positive, citronellal was produced in an aqueous/organic two liquid phase system by 11 of the 46 tested strains, which demonstrates the relevance of applying two-phase systems to screening strategies. Z. mobilis and Citrobacter freundii formed 1 mM citronellal in 3 h in the presence of a NADPH regenerating system and 20% (v/v) toluene. In comparison to these bacteria, the eukaryotic strains showed at least five-fold lower citral reductase activities. The bacterial strains produced preferentially the (S)-enantiomer of citronellal with e.e. values of >99% for Z. mobilis and 75% for Citrobacter freundii. In contrast the yeasts produced preferentially (R)-citronellal, i.e. Candida rugosa with an enantiomeric excess value of more than 98%. Many strains formed alcoholic by-products, viz. geraniol, nerol and citronellol. For Z. mobilis the production of these alcohols was suppressed in the presence of various organic solvents, e.g. toluene, and further decreased after EDTA addition. 相似文献
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香茅醛是一种重要的单离香料。据分析在马蜂柑和红河橙叶精油中含有大量香茅醛.分别达到77.98~78.23%和33.28~35.89%,是香茅醛的两种新的资源植物。此外,由于这两种植物叶精油中还含育其它大量含氧化合物,总计达到93.81~91.12%和67.42~67.92%而萜烃成分较少,只有1.38~4.66%和28.19~30.07%,因而精油香味独特,是两种有发展前途的香料植物。 相似文献
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Sarah A. Corbet Catherine Tiley Tom Moorhouse Colin Giam Stephanie Pursglove Joanne Raby Merynne Rich 《Entomologia Experimentalis et Applicata》2000,94(3):295-307
Oils and other surface films used against mosquito larvae may act by flooding the tracheal system with oil, by disrupting the surface forces that allow larvae to rest at the surface, by toxicity, or by eliciting chemosensory responses. In an attempt to identify diagnostic symptoms of these modes of action we treated fourth-stage larvae of Culex pipiens L. form molestusForskål (Diptera: Culicidae: Culicinae) with agents operating in a single mode (Ondina oil for flooding with oil, nicotine for toxicity, and the detergent Triton X-100 for disruption of surface forces), in two modes (silicone oil) or in three (eucalyptus oil, citronellal, or caproic acid ethyl ester). We monitored the time course of flooding and immobilisation, used experiments to separate volatile toxicity from toxicity of the aqueous solution, and used video and The Observer software to analyse larval behaviour.Larvae that experienced tracheal flooding applied their mouthparts to the siphon (tail nibbling), often losing contact with the surface while doing so and falling to the bottom. Nicotine immobilised larvae without interfering with surface forces, and the larvae remained immobile hanging from the air-water interface for long periods. In detergent, larvae made repeated unsuccessful attempts to thrust the siphon through the surface. The behaviour-modifying chemicals caproic acid ethyl ester, eucalyptus oil and citronellal all operated in more than one mode. They all decreased the proportion of time larvae spent at the surface, whereas Ondina oil and silicone fluid increased it.Using this approach it should be possible to identify the modes of action of novel larvicidal agents. This could form a basis for rational design of larvicides giving an optimal compromise between efficacy against mosquito larvae and minimal damage to non-target organisms. 相似文献
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Eun Jo Du Tae Jung Ahn Min Sung Choi Ilmin Kwon Hyung-Wook Kim Jae Young Kwon KyeongJin Kang 《Molecules and cells》2015,38(10):911-917
Citronellal, a well-known plant-derived mosquito repellent, was previously reported to repel Drosophila melanogaster via olfactory pathways involving but not directly activating Transient Receptor Potential Ankyrin 1 (TRPA1). Here, we show that citronellal is a direct agonist for Drosophila and human TRPA1s (dTRPA1 and hTRPA1) as well as Anopheles gambiae TRPA1 (agTRPA1). Citronellal-induced activity is isoform-dependent for Drosophila and Anopheles gambiae TRPA1s. The recently identified dTRPA1(A) and ag-TRPA1(A) isoforms showed citronellal-provoked currents with EC50s of 1.0 ± 0.2 and 0.1 ± 0.03 mM, respectively, in Xenopus oocytes, while the sensitivities of TRPA1(B)s were much inferior to those of TRPA1(A)s. Citronellal dramatically enhanced the feeding-inhibitory effect of the TRPA1 agonist N-methylmaleimide (NMM) in Drosophila at an NMM concentration that barely repels flies. Thus, citronellal can promote feeding deterrence of fruit flies through direct action on gustatory dTRPA1, revealing the first isoform-specific function for TRPA1(A). 相似文献
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