7 stigmasterol/nicotiana

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Sterol Changes during Germination of Nicotiana tabacum Seeds.

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The identity, composition, and concentration of the total, free, esterified, and glycosidic sterol fractions were determined during germination of tobacco seeds. The total, free, and esterified sterols increased, with stigmasterol and campesterol accounting for most of the increase. Steryl

Expression of the Hevea brasiliensis (H.B.K.) Mull. Arg. 3-Hydroxy-3-Methylglutaryl-Coenzyme A Reductase 1 in Tobacco Results in Sterol Overproduction.

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A genomic fragment encoding one (HMGR1) of the three 3-hydroxy-3-methylglutaryl coenzyme A reductases (HMGRs) from Hevea brasiliensis (H.B.K.) Mull. Arg. (M.-L. Chye, C.-T. Tan, N.-H. Chua [1992] Plant Mol Biol 19: 473-484) was introduced into Nicotiana tabacum L. cv xanthi via Agrobacterium

Spatial and temporal regulation of sterol biosynthesis in Nicotiana benthamiana.

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Nicotiana benthamiana was used as a model to investigate the spatial and developmental relationship between sterol synthesis rates and sterol content in plants. Stigmasterol levels were approximately twice the level in roots as that found in aerial tissues, while its progenitor sterol sitosterol was

Shading Influence on the Sterol Balance of Nicotiana tabacum L.

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Tobacco plants (Nicotiana tabacum L.) were grown in the field and the apex was removed at the 42-day stage. Shading screens were set up which produced 0, 26, 67, and 90% shade. Plants were grown an additional 25 days before leaves from top, middle, and bottom stalk positions were harvested. Each

Properties of plasma membranes of Phsp 70-ipt transformed tobacco (Nicotiana tabacum).

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Application of 10 successive daily heat shocks reduced the growth of control tobacco (Nicotiana tabacum L. cv. Petit Havana SR1) plants by about 15%; for Phsp 70-ipt transformed plants this is about 48%. The shoot diameter of these ipt-transformed plants increased by about 75%. In addition, in heat

Effect of Light on Mevalonic Acid Incorporation into the Phytosterols of Nicotiana tabacum L. Seedlings.

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Mevalonic acid-2-(14)C was readily incorporated into the free, esterified, and glycosidic sterol fractions of tobacco (Nicotiana tabacum L. var. Burley 21) seedlings. The time course of mevalonic acid-2-(14)C incorporation was different for the various individual sterols. Campesterol and sitosterol

Effect of tobacco mosaic virus infection on glucose metabolism in Nicotiana tabacum var. Samsun. III. Investigation of hexosemonophosphate shunt enzymes and steroid concentration and biosynthesis.

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Activity of the enzymes phosphoriboisomerase, glucose-6-phosphate and 6-phosphogluconic acid dehydrogenases were assayed in healthy and TMV-infected roots of Nicotiana tabacum L. var. Samsun plants grown in nutrient culture. The results indicate that all enzymes were equally active in both infected

Two new chlorinated amides from Nicotiana glauca R. Graham.

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Two new chlorinated amides, N-(2',6'-diethyl phenyl)-2-chloroacetamide (1) and N-(butyloxymethyl)-N-(2',6'-diethyl phenyl)-2-chloroacetamide (2) were isolated for the first time from the ethanolic extract of the leaves of Nicotiana glauca R. Graham in addition to triacontanol (3), scopoletin (4) and

RNAi of Sterol Methyl Transferase1 Reveals its Direct Role in Diverting Intermediates Towards Withanolide/Phytosterol Biosynthesis in Withania somnifera.

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The medicinal properties of Ashwagandha (Withania somnifera) are accredited to a group of compounds called withanolides. 24-Methylene cholesterol is the intermediate for sterol biosynthesis and a proposed precursor of withanolide biogenesis. However, conversion of 24-methylene cholesterol to

Inhibition of sterol biosynthesis reduces tombusvirus replication in yeast and plants.

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The replication of plus-strand RNA viruses depends on subcellular membranes. Recent genome-wide screens have revealed that the sterol biosynthesis genes ERG25 and ERG4 affected the replication of Tomato bushy stunt virus (TBSV) in a yeast model host. To further our understanding of the role of

Phytosterols play a key role in plant innate immunity against bacterial pathogens by regulating nutrient efflux into the apoplast.

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Bacterial pathogens colonize a host plant by growing between the cells by utilizing the nutrients present in apoplastic space. While successful pathogens manipulate the plant cell membrane to retrieve more nutrients from the cell, the counteracting plant defense mechanism against nonhost pathogens

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