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We earlier reported that when phenylalanine ammonia-lyase (PAL) activity in radish seedlings was inhibited by the competitive inhibitor 2-aminoindan-2-phosphonic acid (AIP), soluble sinapoyl esters carried over from the seed were converted to wall-bound esters in young cotyledons. We now report that these soluble sinapoyl esters may also be converted into lignin in the cotyledons. When radish seedlings...
Between the third and eighth day of radish seedling growth, wall-bound esters of (E)-sinapic and (E)-p-coumaric acids increase about fourfold, (E)-ferulic acid about sixfold, in the cotyledons. In the hypocotyl plus roots, wall-bound ferulic and p-coumaric acids increase twofold but wall-bound sinapic acid levels are unchanged. When grown with 100 μM 2-aminoindan-2-phosphonic acid (AIP), a competitive...
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