germacrene/nicotiana

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Isolation and characterization of two germacrene A synthase cDNA clones from chicory.

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Chicory (Cichorium intybus) sesquiterpene lactones were recently shown to be derived from a common sesquiterpene intermediate, (+)-germacrene A. Germacrene A is of interest because of its key role in sesquiterpene lactone biosynthesis and because it is an enzyme-bound intermediate in the

In planta and in silico characterization of five sesquiterpene synthases from Vitis vinifera (cv. Shiraz) berries.

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UNASSIGNED Five Vitis vinifera sesquiterpene synthases were characterized, two was previously uncharacterized, one being a caryophyllene/cubebene synthase and the other a cadinene synthase. Residue differences with other Vitis sesquiterpene synthases are described. The biochemical composition of

Biosynthesis of volatile terpenes that accumulate in the secretory cavities of young leaves of Japanese pepper (Zanthoxylum piperitum): Isolation and functional characterization of monoterpene and sesquiterpene synthase genes.

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Volatile terpenes are ones of the characteristic aromas of Japanese pepper (Zanthoxylum piperitum). It has been hypothesized that the specialized epithelial cells surrounding the secretory cavities of Japanese pepper fruits and leaves are responsible for the synthesis of monoterpenes and

Nitrogen supply influences herbivore-induced direct and indirect defenses and transcriptional responses in Nicotiana attenuata.

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Although nitrogen (N) availability is known to alter constitutive resistance against herbivores, its influence on herbivore-induced responses, including signaling pathways, transcriptional signatures, and the subsequently elicited chemical defenses is poorly understood. We used the native tobacco,

18-Hydroxydolabella-3,7-diene synthase - a diterpene synthase from Chitinophaga pinensis.

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The product obtained in vitro from a diterpene synthase encoded in the genome of the bacterium Chitinophaga pinensis, an enzyme previously reported to have germacrene A synthase activity during heterologous expression in Escherichia coli, was identified by extensive NMR-spectroscopic methods as

Silencing of a germin-like gene in Nicotiana attenuata improves performance of native herbivores.

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Germins and germin-like proteins (GLPs) are known to function in pathogen resistance, but their involvement in defense against insect herbivores is poorly understood. In the native tobacco Nicotiana attenuata, attack from the specialist herbivore Manduca sexta or elicitation by adding larval oral

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

Reconstitution of the costunolide biosynthetic pathway in yeast and Nicotiana benthamiana.

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The sesquiterpene costunolide has a broad range of biological activities and is the parent compound for many other biologically active sesquiterpenes such as parthenolide. Two enzymes of the pathway leading to costunolide have been previously characterized: germacrene A synthase (GAS) and germacrene

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