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UV-B induction of flavonoid biosynthesis in Scots pine (Pinus sylvestris L.) seedlings.
Trees-Struct. Funct. 11, 162-168 (1997)
Cultivation of Scots pine (Pinus sylvestris L.) seedlings under simulated global radiation including the UV-B band (280-320 nm; 220 mW m(-2) UV-B-BE) led to increased formation of the diacylated flavonol glucosides 3'',6''-di-p-coumaroyl-astragalin and 3'',6''-di-p-coumaroyl-isoquercitrin in primary and cotyledonary needles, respectively. 3'',6''-Di-p-coumaroyl-astragalin was also the main constitutive diacylated flavonol glucoside in both needle types. This compound predominantly accumulated in primary needles upon UV-B irradiation, and reached concentrations of 2.4 mu mol g(-1) fresh weight (fw). Its concentration was only weakly affected in cotyledonary needles. 3'',6''-Di-p-coumaroyl-isoquercitrin was mainly induced in cotyledonary needles with maximum concentrations of 0.8 to 0.9 mu mol g(-1) fw, but was virtually unaffected in primary needles under the same irradiation conditions. Pulse labelling with L-(U-C-14)phenylalanine revealed that these metabolites were formed de novo. Phenylalanine ammonialyase (EC 126.96.36.199) and chalcone synthase (EC 188.8.131.52) were only slightly induced by the UV-B treatment. The results described here represent the first report on UV-B-induced flavonoid biosynthesis in a conifer species.
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Publication type Article: Journal article
Document type Scientific Article
Keywords chalcone synthase; flavonoids; phenylalanine ammonia-lyase; Scots pine; UV-B radiation; ULTRAVIOLET-B; CHALCONE SYNTHASE; RADIATION; PLANTS; GROWTH; LIGHT; OZONE; PENETRATION; RESPONSES; PRODUCTS
ISSN (print) / ISBN 0931-1890
Journal Trees - Structure and Function
Quellenangaben Volume: 11, Issue: 3, Pages: 162-168
Publishing Place Berlin ; Heidelberg ; New York
Reviewing status Peer reviewed