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6 résultats
Cytoplasmic accumulation of flavonoids in flower petals and its relevance to yellow flower colouration.
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It is widely accepted that the mix of flavonoids in the cell vacuole is the source of flavonoid based petal colour, and that analysis of the petal extract reveals the nature and relative levels of vacuolar flavonoid pigments. However, it has recently been established with lisianthus flowers that
The B-ring hydroxylation pattern of anthocyanins can be determined through activity of the flavonoid 3'-hydroxylase on leucoanthocyanidins.
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CONCLUSIONS
In contrast to current knowledge, the B -ring hydroxylation pattern of anthocyanins can be determined by the hydroxylation of leucoanthocyanidins in the 3' position by flavonoid 3'-hydroxylase. The cytochrome P450-dependent monooxygenases flavonoid 3'-hydroxylase (F3'H) and flavonoid
Lisianthus flavonoid pigments and factors influencing their expression in flower colour.
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NMR, MS and analytical data are cited in support of the newly defined complete structures of the major flavonoid pigments and copigments in lisianthus flowers. The copigments newly characterized and found in flowers of all colours are kaempferol-3-O-beta-D-[6-O-rhamnopyranosyl-4-O-E-p-
Cell wall sited flavonoids in lisianthus flower petals.
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Flavonoids are considered to be located predominantly in the vacuoles of epidermal cells and in the cuticular wax of terrestrial plants. However, recent reports have suggested that flavonoids may also reside elsewhere in the cells of green leaves. In the present study of lisianthus flower petals, it
MYB and bHLH transcription factor transgenes increase anthocyanin pigmentation in petunia and lisianthus plants, and the petunia phenotypes are strongly enhanced under field conditions.
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Petunia line Mitchell [MP, Petunia axillaris × (P. axillaris × P. hybrida)] and Eustoma grandiflorum (lisianthus) plants were produced containing a transgene for over-expression of the R2R3-MYB transcription factor [TF; ROSEA1 (ROS1)] that up-regulates flavonoid biosynthesis in Antirrhinum majus.
A comparison of two strategies to modify the hydroxylation of condensed tannin polymers in Lotus corniculatus L.
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A full-length sense Antirrhinum majus dihydroflavonol reductase (DFR) sequence was introduced into birdsfoot trefoil (Lotus corniculatus L.) in experiments aimed at modifying condensed tannin content and polymer hydroxylation in a predictable manner. Analysis of transgenic plants indicated lines
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