Nitrogen deficiency induced changes of free amino acids and coumarin contents in the leaves of Matricaria chamomilla

• Autorzy: Kovacik J , Repcak M. , Kron I.
• Języki publikacji: EN

Abstrakty

EN

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 (Ej-2-β-D-glucopyranosyloxy- 4-methoxycinnamic 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 experi ment, but these plants produced significantly higher root biomass. Among secondary metabolites, the sum of 2-β-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 ammonialyase activity under nitrogen deficiency and nitrogen-free carbon skeletons are shunted in to the phenylpropanoid metabolism, including biosynthesis of (Z)- and (E)-2-β-D-glucopyranosyloxy-4-methoxycinnamic acids.

Słowa kluczowe

EN

free amino acid; amino acid content; nitrogen deficiency; plant physiology; nitrogen content; herniarin; coumarin content; Matricaria chamomilla; 2-beta-D-glucopyranosyloxy-4-methoxycinnamic acid; tyrosine; leaf; camomile

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2006
• Tom: 28
• Numer: 2
• Opis fizyczny: p.159-164,fig.,ref.

Twórcy

autor

Kovacik J

• P.J.Safarik University, Manesova 23, 041 67 Kosice, Slovak Republic

autor

Repcak M.

autor

Kron I.

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