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antirrhinum majus/reductase
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Molecular cloning and expression analysis of dihydroflavonol 4-reductase gene in flower organs of Forsythia x intermedia.
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The expression, during flower development, of the gene encoding the anthocyanin pathway key enzyme dihydroflavonol 4-reductase (DFR) was investigated in floral organs of Forsythia x intermedia cv. 'Spring Glory'. Full-length DFR and partial chalcone synthase (CHS) cDNAs, the gene of interest and a
Expression of an Antirrhinum dihydroflavonol reductase gene results in changes in condensed tannin structure and accumulation in root cultures of Lotus corniculatus (bird's foot trefoil).
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Condensed tannins (proanthocyanidins) are an important factor in the nutritive and dietary quality of many forage crops. We report here experiments aimed at altering the levels and monomer composition of condensed tannins (CTs) in 'hairy root' cultures of Lotus corniculatus (bird's foot trefoil)
Genetic manipulation of condensed tannins in higher plants. Ii. Analysis Of birdsfoot trefoil plants harboring antisense dihydroflavonol reductase constructs
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We have produced and analyzed transgenic birdsfoot trefoil (Lotus corniculatus L.) plants harboring antisense dihydroflavonol reductase (AS-DFR) sequences. In initial experiments the effect of introducing three different antisense Antirrhinum majus L. DFR constructs into a single recipient genotype
Genetic modification of condensed tannin biosynthesis in Lotus corniculatus. 1. Heterologous antisense dihydroflavonol reductase down-regulates tannin accumulation in "hairy root" cultures.
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An antisense dihydroflavonol reductase (DFR) gene-construct made using the cDNA for DFR from Antirrhinum majus was introduced into the genome of a series of clonal genotypes of Lotus corniculatus via Agrobacterium rhizogenes. After initial screening, 17 antisense and 11 control transformation events
Expression of chalcone synthase, dihydroflavonol reductase, and flavanone-3-hydroxylase in mutants of barley deficient in anthocyanin and proanthocyanidin biosynthesis.
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A barley (cv Triumph) cDNA library was screened with a cDNA probe encoding flavanone-3-hydroxylase of Antirrhinum majus. A full-length clone coding for a protein of 377 amino acids (42 kDa), with an overall homology of 71% and a central domain homology of 85% to the Antirrhinum protein, was
Structure of the Hordeum vulgare gene encoding dihydroflavonol-4-reductase and molecular analysis of ant18 mutants blocked in flavonoid synthesis.
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A full-length cDNA clone encoding barley dihydroflavonol-4-reductase was isolated from a kernel-specific cDNA library by screening with the cDNA of the structural gene (A1) for this enzyme from maize. Subsequently, the gene corresponding to the barley dihydroflavonol-4-reductase cDNA was cloned and
Flavonoid synthesis in Petunia hybrida: partial characterization of dihydroflavonol-4-reductase genes.
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In this paper we describe the organization and expression of the genes encoding the flavonoid-biosynthetic enzyme dihydroflavonol-4-reductase (DFR) in Petunia hybrida. A nearly full-size DFR cDNA clone (1.5 kb), isolated from a corolla-specific cDNA library was compared at the nucleotide level with
Characterization of the gene encoding dihydroflavonol 4-reductase in tomato.
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A cDNA clone (DFR) encoding dihydroflavonol 4-reductase was identified from tomato hypocotyls. Nucleotide and amino acid sequence comparisons to Petunia hybrida, Antirrhinum majus and Zea mays DFR sequences confirmed that the cDNA encodes the structural DFR gene. In tomato, the DFR sequence appeared
Molecular genetic basis of flower colour variegation in Linaria.
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To identify transposons that may be of use for mutagenesis we investigated the genetic molecular basis of a case of flower colour variegation in Linaria, a close relative of the model species Antirrhinum majus. We show that this variegation is attributable to an unstable mutant allele of the gene
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
The petunia homologue of the Antirrhinum majus candi and Zea mays A2 flavonoid genes; homology to flavanone 3-hydroxylase and ethylene-forming enzyme.
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The synthesis of anthocyanins in higher plants involves many enzymatic steps. Here we describe the isolation and characterization of a cDNA, ant17, which encodes a protein that has 73% amino acid sequence identity with the candi gene product of Antirrhinum majus and 48% with that of the maize a2
Cloning and molecular analysis of structural genes involved in flavonoid and stilbene biosynthesis in grape (Vitis vinifera L.).
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Genes involved in flavonoid and stilbene biosynthesis were isolated from grape (Vitis vinifera L.). Clones coding for phenylalanine ammonia-lyase (PAL), chalcone synthase (CHS), chalcone isomerase (CHI), flavanone 3-hydroxylase (F3H), dihydroflavonol 4-reductase (DFR), leucoanthocyanidin dioxygenase
The Antirrhinum AmDEL gene enhances flavonoids accumulation and salt and drought tolerance in transgenic Arabidopsis.
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CONCLUSIONS
A basic helix-loop-helix (bHLH) transcription factor gene from Antirrhinum, AmDEL , increases flavonoids accumulation and enhances salt and drought tolerance via up-regulating flavonoid biosynthesis, proline biosynthesis and ROS scavenging genes in transgenic Arabidopsis. In plants,
Directed evolution of plant basic helix-loop-helix transcription factors for the improvement of transactivational properties.
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Myc-RP from Perilla frutescens and Delila from Antirrhinum majus, two plant basic helix-loop-helix transcription factors (bHLH TFs) involved in the flavonoid biosynthetic pathway, have been used for the improvement of transactivational properties by directed evolution. Through two rounds of DNA
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