Jasmonate-induced Changes in Flavonoid Metabolism in Barley (Hordeum vulgare) Leaves(Organic Chemistry)

概要

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The effects of jasmonic acid (JA) on secondary metabolism in barley (Hordeum vulgare L.) were investigated. A reversed-phase HPLC analysis revealed that the amount of a particular compound increased in excised barley leaf segments that had been treated with JA. This compound was purified and identified as 6'''-feruloylsaponarin (1) by spectroscopic analyses and alkaline hydrolysis. A related compound, 6'''-sinapoylsaponarin (2), was also found to accumulate in excised leaves independently of the JA treatment. The accumulation of these compounds was accompanied by a decrease in the saponarin (3) content. [8, 9-^<13>C] p-Coumaric acid and [2, 3, 4, 5, 6-^2H] L-phenylalanine were effectively incorporated into the hydroxycinnamoyl moieties in 1 and 2, while the degree of incorporation of the labeled precursors into the saponarin part was small. These findings indicate that the hydroxycinnamoyl moieties of 1 and 2 are synthesized de novo from phenylalanine via the phenylpropanoid pathway, and that the saponarin part is mainly provided by the constitutive pool of 3.
社団法人日本農芸化学会の論文
2002-10-23