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Modulation of Quorum Sensing in Acylhomoserine Lactone-Producing or -Degrading Tobacco Plants Leads to Alteration of Induced Systemic Resistance Elicited by the Rhizobacterium Serratia marcescens 90-166.

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Numerous root-associated bacteria (rhizobacteria) are known to elicit induced systemic resistance (ISR) in plants. Bacterial cell-density-dependent quorum sensing (QS) is thought to be important for ISR. Here, we investigated the role of QS in the ISR elicited by the rhizobacterium, Serratia

Generation and properties of ascorbic acid-overproducing transgenic tobacco cells expressing sense RNA for l-galactono-1,4-lactone dehydrogenase.

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L-Galactono-1,4-lactone dehydrogenase (GalLDH; EC 1.3.2.3) is the last enzyme in the putative L-ascorbic acid (AsA) biosynthetic pathway of plants. Here, we show for the first time that the overexpression of GalLDH can increase AsA content in tobacco (Nicotiana tabacum L.) BY-2 cells. To see the

Cytochrome P450s from Cynara cardunculus L. CYP71AV9 and CYP71BL5, catalyze distinct hydroxylations in the sesquiterpene lactone biosynthetic pathway.

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Cynara cardunculus (Asteraceae) is a cross pollinated perennial crop which includes the two cultivated taxa globe artichoke and cultivated cardoon. The leaves of these plants contain high concentrations of sesquiterpene lactones (STLs) among which cynaropicrin is the most represented, and has

L-galactono-1,4-lactone dehydrogenase is required for the accumulation of plant respiratory complex I.

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Mitochondrial NADH-ubiquinone oxidoreductase (complex I) is the largest enzyme of the oxidative phosphorylation system, with subunits located at the matrix and membrane domains. In plants, holocomplex I is composed of more than 40 subunits, 9 of which are encoded by the mitochondrial genome (NAD

Differences in PpAAT1 activity in high- and low-aroma peach varieties affect γ-decalactone production.

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Aroma contributes to the unique flavors of fruits and is important for fruit quality evaluation. Among the many volatiles in peach (Prunus persicus) fruits, γ-decalactone has the greatest contribution to the characteristic peach aroma. Some peach cultivars have γ-decalactone contents that are too

[Advances in synthesis of artemisinin based on plant genetic engineering].

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Artemisinin is a kind of sesquiterpene lactone containing endoperoxide bridge,which is the most effective anti-malarial drug at present. However,low content of artemisinin in Artemisia annua,ranging from 0. 1%-1. 0% of dry weight,as well as the complicated extraction process have resulted in low

Characterization of CYP71AX36 from Sunflower (Helianthus annuus L., Asteraceae).

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Sesquiterpene lactones (STL) are a subclass of isoprenoids with many known bioactivities frequently found in the Asteraceae family. In recent years, remarkable progress has been made regarding the biochemistry of STL, and today the biosynthetic pathway of the core backbones of many STLs has been

Accumulation of cynaropicrin in globe artichoke and localization of enzymes involved in its biosynthesis.

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Globe artichoke (Cynara cardunculus var. scolymus) belongs to the Asteraceae family, in which one of the most biologically significant class of secondary metabolites are sesquiterpene lactones (STLs). In globe artichoke the principal STL is the cynaropicrin, which contributes to approximately 80% of

Synthesis of L-ascorbic acid in the phloem.

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BACKGROUND Although plants are the main source of vitamin C in the human diet, we still have a limited understanding of how plants synthesise L-ascorbic acid (AsA) and what regulates its concentration in different plant tissues. In particular, the enormous variability in the vitamin C content of

Functional characterization of the cytochrome P450 monooxygenase CYP71AU87 indicates a role in marrubiin biosynthesis in the medicinal plant Marrubium vulgare.

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Horehound (Marrubium vulgare) is a medicinal plant whose signature bioactive compounds, marrubiin and related furanoid diterpenoid lactones, have potential applications for the treatment of cardiovascular diseases and type II diabetes. Lack of scalable plant cultivation and the complex

Tobacco Chemistry.29. (7S)-10-Oxo-4xi-methyl-7-isopropyl-5E-undecen-4-olide, a New Thunbergan-type Nor-isoprenoid isolated from Greek Nicotiana tabacum L.

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The structure of a new C15-lactone, (7S)-10-oxo-4xi-methyl-7-isopropyl-5E-undecen-4-olide, isolated from Greek tobacco, has been determined mainly be 1H NMR, 13C NMR and high resolution MS, and its absolute configuration established by degradation to (2S)-5-oxo-2-isopropylhexanal. The carbon

Rhodopseudomonas palustris quorum sensing molecule pC-HSL induces systemic resistance to TMV infection via up-regulation of NbSIPK/NbWIPK expressions in Nicotiana benthamiana

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G-negative bacteria produce a myriad of N-acyl-homoserine lactones (AHLs) that can function as quorum sensing (QS) signaling molecules. AHLs are also known to regulate various plant biological activities. p-Coumaroyl-homoserine lactone (pC-HSL) is the only QS molecule produced by a photosynthetic

Ubiquitous presence of beta-glucuronidase (GUS) in plants and its regulation in some model plants.

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The enzyme beta-glucuronidase (GUS) is well characterized in animals and microbes. However, this enzyme is not well studied in plants and is widely assumed to be absent in them. In this study we document the ubiquitous presence of GUS in the model plants Arabidopsis thaliana, Oryza sativa, Nicotiana

Co-expression of NCED and ALO improves vitamin C level and tolerance to drought and chilling in transgenic tobacco and stylo plants.

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Abscisic acid (ABA) regulates plant adaptive responses to various environmental stresses, while L-ascorbic acid (AsA) that is also named vitamin C is an important antioxidant and involves in plant stress tolerance and the immune system in domestic animals. Transgenic tobacco (Nicotiana tabacum L.)

A coumarin-specific prenyltransferase catalyzes the crucial biosynthetic reaction for furanocoumarin formation in parsley.

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Furanocoumarins constitute a sub-family of coumarin compounds with important defense properties against pathogens and insects, as well as allelopathic functions in plants. Furanocoumarins are divided into two sub-groups according to the alignment of the furan ring with the lactone structure: linear

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