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A Novel Metabolic Pathway for Indole-3-Acetic Acid in Apical Shoots of Populus tremula (L.) x Populus tremuloides (Michx.).

机译:毛白杨(L.)x毛白杨(Michx。)的顶芽中吲哚-3-乙酸的新型代谢途径。

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摘要

Metabolism of indole-3-acetic acid (IAA) in apical shoots of Populus tremula (L.) x Populus tremuloides (Michx.) was investigated by feeding a mixture of [12C]IAA, [13C6]IAA, and [1[prime]-14C]IAA through the base of the excised stem. HPLC of methanolic plant extracts revealed eight major radiolabeled metabolites after a 24-h incubation period. Comparison between feeds with [5-3H]IAA and [1[prime]-14C]IAA showed that all detectable metabolites were nondecarboxylative products. The purified radiolabeled HPLC fractions were screened by frit-fast atom bombardment liquid chromatography-mass spectrometry for compounds with characteristic fragment pairs originating from the application with 12C and 13C isotopes. Samples of interest were further characterized by gas chromatography-mass spectrometry. Using this procedure, oxindole-3-acetic acid (OxIAA), indole-3-acetyl-N-aspartic acid (IAAsp), oxindole-3-acetyl-N-aspartic acid (OxIAAsp), and ring-hydroxylated oxindole-3-acetic acid were all identified as IAA metabolites. Furthermore, a novel metabolic pathway from IAA via IAAsp and OxIAAsp to OxIAA was established on the basis of refeeding experiments with the different IAA metabolites.
机译:通过喂食[12C] IAA,[13C6] IAA和[1 [prime] ] -14C] IAA通过切下的茎基部。甲醇植物提取物的HPLC在24小时的温育期后显示出8种主要的放射性标记代谢物。含[5-3H] IAA和[1 [prime] -14C] IAA的饲料之间的比较表明,所有可检测到的代谢产物均为非脱羧产物。通过熔接快速原子轰击液相色谱-质谱法对纯化的放射性标记的HPLC馏分进行筛选,以筛选具有特征片段对的化合物,这些化合物具有源自12C和13C同位素的应用。感兴趣的样品通过气相色谱-质谱进一步表征。使用此程序,可将羟吲哚-3-乙酸(OxIAA),吲哚-3-乙酰基-N-天门冬氨酸(IAAsp),羟吲哚-3-乙酰基-N-天冬氨酸(OxIAAsp)和环羟基化的羟吲哚-3-乙酸均被鉴定为IAA代谢产物。此外,在使用不同IAA代谢物进行补料实验的基础上,建立了从IAA通过IAAsp和OxIAAsp到OxIAA的新代谢途径。

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