期刊
ACTA PHYSIOLOGIAE PLANTARUM
卷 28, 期 2, 页码 159-164出版社
POLISH ACAD SCIENCES DEPT PLANT PHYSIOLOGY
DOI: 10.1007/s11738-006-0042-x
关键词
2-beta-D-glucopyranosyloxy-4-methoxycinnamic acids; free amino acids; herniarin; Matricaria chamomilla; nitrogen deficiency; tyrosine
Through o-hydroxycinnamic acids, the biosynthesis of coumarins is connected with aromatic amino acid metabolism and nitrogen uptake. Therefore the quantitative changes in levels of some free amino acids and coumarins (herniarin and its glucosidic precursors (Z)- and (E)-2-beta-D-glucopyranosyloxy-4-metboxycinnamic acids, umbelliferone) in the leaf rosettes of chamomile (Matricaria chamomilla L.) subjected to nitrogen deficiency were studied. Nitrogen content decreased in the leaf rosettes and in the roots of N-deficient plants during the course of the experiment, but these plants produced significantly higher root biomass. Among secondary metabolites, the sum of 2-beta-D-glucopyranosyloxy-4-methoxycinnamic acids increased sharply, herniarin increased slowly and the content of umbelliferone was low in N-deficient plants. We have concluded that nitrogen deficiency is not an inducing factor for stress accumulation of herniarin and umbelliferone. A decrease in levels of all detected amino acids, besides histidine, was found. Within aromatic amino acids, tyrosine was the most abundant. The content of free phenylalanine was significantly lower in both, control and N-deficient plants when compared to the content of tyrosine. In this view, the increase of herniarin glucosidic precursors is apparently due to enhancing phenylalanine ammonia-lyase activity under nitrogen deficiency and nitrogen-free carbon skeletons are shunted in to the phenylpropanoid metabolism, including biosynthesis of (Z) and (E)-2-beta-D-glucopyranosyloxy-4-methoxycinnamic acids.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据