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11 résultats
Characterization of a heavy-ion induced white flower mutant of allotetraploid Nicotiana tabacum.
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KEY MESSAGE : We characterized a white flower mutant of allotetraploid N. tabacum as a DFR-deficient mutant; one copy of DFR has a cultivar-specific frameshift, while the other was deleted by heavy-ion irradiation. In most plants, white-flowered mutants have some kind of deficiency or defect in
Functional characterization of proanthocyanidin pathway enzymes from tea and their application for metabolic engineering.
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Tea (Camellia sinensis) is rich in specialized metabolites, especially polyphenolic proanthocyanidins (PAs) and their precursors. To better understand the PA pathway in tea, we generated a complementary DNA library from leaf tissue of the blister blight-resistant tea cultivar TRI2043 and
Ectopic expression of apple F3'H genes contributes to anthocyanin accumulation in the Arabidopsis tt7 mutant grown under nitrogen stress.
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Three genes encoding flavonoid 3'-hydroxylase (F3'H) in apple (Malus x domestica), designated MdF3'HI, MdF3'HIIa, and MdF3'HIIb, have been identified. MdF3'HIIa and MdF3'HIIb are almost identical in amino acid sequences, and they are allelic, whereas MdF3'HI has 91% nucleotide sequence identity in
Early steps in proanthocyanidin biosynthesis in the model legume Medicago truncatula.
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Oligomeric proanthocyanidins (PAs) composed primarily of epicatechin units accumulate in the seed coats of the model legume Medicago truncatula, reaching maximal levels at around 20 d after pollination. Genes encoding the single Medicago anthocyanidin synthase (ANS; EC 1.14.11.19) and
Characterization of a grapevine R2R3-MYB transcription factor that regulates the phenylpropanoid pathway.
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The ripening of grape (Vitis vinifera) berry is characterized by dramatic changes in gene expression, enzymatic activities, and metabolism that lead to the production of compounds essential for berry quality. The phenylpropanoid metabolic pathway is one of the components involved in these changes.
Cloning and Functional Characterization of Dihydroflavonol 4-Reductase Gene Involved in Anthocyanidin Biosynthesis of Grape Hyacinth.
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Grape hyacinth (Muscari spp.) is a popular ornamental plant with bulbous flowers noted for their rich blue color. Muscari species have been thought to accumulate delphinidin and cyanidin rather than pelargonidin-type anthocyanins because their dihydroflavonol 4-reductase (DFR) does not
Molecular and biochemical analysis of two cDNA clones encoding dihydroflavonol-4-reductase from Medicago truncatula.
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Dihydroflavonol-4-reductase (DFR; EC1.1.1.219) catalyzes a key step late in the biosynthesis of anthocyanins, condensed tannins (proanthocyanidins), and other flavonoids important to plant survival and human nutrition. Two DFR cDNA clones (MtDFR1 and MtDFR2) were isolated from the model legume
Heterologous expression of IbMYB1a by different promoters exhibits different patterns of anthocyanin accumulation in tobacco.
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We previously reported that the transient and stable expression of IbMYB1a produced anthocyanin pigmentation in tobacco leaves and transgenic Arabidopsis plants, respectively. To further determine the effects of different promoters on the expression of IbMYB1a and anthocyanin production, we
Engineering the anthocyanin regulatory complex of strawberry (Fragaria vesca).
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The woodland strawberry, Fragaria vesca is a model fruit for a number of rosaceous crops. We have engineered altered concentrations of anthocyanin in F. vesca, to determine the impact on plant growth and fruit quality. Anthocyanin concentrations were significantly increased by over-expression or
Three Camellia sinensis glutathione S-transferases are involved in the storage of anthocyanins, flavonols, and proanthocyanidins.
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Biochemical, transgenic, and genetic complementation data demonstrate that three glutathione S-transferases are involved in the storage of anthocyanins, flavonols, and proanthocyanins in plant cells. Flavonoids are compounds in tea (Camellia sinensis) that confer the characteristic astringent taste
McMYB10 regulates coloration via activating McF3'H and later structural genes in ever-red leaf crabapple.
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The ever-red leaf trait, which is important for breeding ornamental and higher anthocyanin plants, rarely appears in Malus families, but little is known about the regulation of anthocyanin biosynthesis involved in the red leaves. In our study, HPLC analysis showed that the anthocyanin concentration
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