Proanthocyanidin Biochemistry And Molecular Regulation
New perspectives on proanthocyanidin biochemistry and molecular regulation Abstract Our understanding of proanthocyanidin (syn. condensed tannin) synthesis has been recently extended by substantial developments concerning both structural and regulatory genes. A gene encoding leucoanthocyanidin reductase has been obtained from the tropical forage, Desmodium uncinatum, with the latter enzyme catalyzing formation of (+)-catechin. The BANYULS gene
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Expression Of Anthocyanins And Proanthocyanidins
Expression of Anthocyanins and Proanthocyanidins after Transformation of Alfalfa with Maize Lc Abstract Three anthocyanin regulatory genes of maize (Zea mays; Lc, B-Peru, and C1) were introduced into alfalfa (Medicago sativa) in a strategy designed to stimulate the flavonoid pathway and alter the composition of flavonoids produced in forage. Lc constructs included a full-length gene
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Forage Crops
Genetic Manipulation Of Condensed Tannin Synthesis In Forage Crops Abstract Condensed tannins are polymeric flavonoids with protein-precipitating and antioxidant properties. As the understanding of their biological properties increases, the desire to manipulate tannins is becoming stronger among plant breeders. They are particularly important to the development of improved forage quality. Tannins eliminate the foam which
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Condensed Tannin Biotechnology
Genetic Systems for Condensed Tannin Biotechnology Abstract Condensed tannins (proanthocyanidins) are plant phenolic polymers with protein-binding, carbohydrate-binding, and antioxidant properties. Dietary condensed tannins deter some insects from feeding on crops, disrupt insect digestion and growth,1 and deter larger browsing and foraging animals.2 As well, the very high levels of condensed tannins found in tropical plant
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Fusarium Sambucinum
Responses of potato tuber to infection by Fusarium sambucinum Abstract Fusarium sambucinumcauses dry rot in tubers ofSolanum tuberosum. Since relatively little is known about the nature of dry rot disease development, infection ofF. sambucinumon tissue discs prepared from tubers of potato varieties that are susceptible or moderately resistant to this disease was studied. Increases in
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Expression And Disease Response
Transformation of potato with cucumber peroxidase: Expression and disease response Abstract Peroxidase is thought to be important in a variety of plant defence responses against pathogens. Potato was transformed with a cucumber anionic peroxidase under the control of the cauliflower mosaic virus 35S promoter, which is highly expressed in potato tuber tissue. This particular peroxidase
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Allelopathic Chemicals
Variation within flax (Linum usitatissimum) and barley (Hordeum vulgare) in response to allelopathic chemicals Abstract A possible method of manipulating allelopathy would be to develop crop varieties showing an increased tolerance to allelopathic chemicals. We therefore examined four flax (Linum usitatissimum) varieties and two wild Linum species in the presence of p-coumaric acid and four
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Cloned Tetracycline Resistance
Characterization and expression of a cloned tetracycline resistance determinant from Campylobacter jejuni plasmid pUA466 Abstract A tetracycline resistance (Tcr) determinant previously cloned from the Campylobacter jejuni plasmid pUA466 (D. E. Taylor, J. Bacteriol. 165:1037-1039, 1986) was localized by restriction endonuclease mapping, subcloning, and Tn1000 insertion mutagenesis to a 2-kilobase region consisting of 1.8- and 0.2-kilobase
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