Peroxidases are involved in biosynthesis and biodegradation of β-thujaplicin in fungal elicitor-treated Cupressus lusitanica cell cultures
• Here, collaboration between peroxidases and H2 O2 in biosynthesis and biodegredation of β-thujaplicin in elicited Cupressus lusitanica was investigated. • The accumulation of a phytoalexin, β-thujaplicin, in C. lusitanica cell cultures can be stimulated by a yeast elicitor. A transient low pea...
| Veröffentlicht in: | The New phytologist. - 1979. - 159(2003), 3 vom: 20. Sept., Seite 719-731 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2003
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Journal Article Cupressus lusitanica H2O2 elicitor peroxidase superoxide anion synthase β-thujaplicin |
| Zusammenfassung: | • Here, collaboration between peroxidases and H2 O2 in biosynthesis and biodegredation of β-thujaplicin in elicited Cupressus lusitanica was investigated. • The accumulation of a phytoalexin, β-thujaplicin, in C. lusitanica cell cultures can be stimulated by a yeast elicitor. A transient low peak was followed by a high level lasting for 2 d, and then a decrease, while peroxidases were activated to a high level just when amounts of β-thujaplicin decreased. In vitro tests revealed that horseradish peroxidase can transform c. 80% of β-thujaplicin in the presence of H2 O2 , and the culture medium was also able to transform β-thujaplicin. • A transient production of H2 O2 occured in the cell cultures immediately after elicitation, following a increase in NAD(P)H-oxidase activity. This H2 O2 production may mediate the elicitor-induced accumulation of β-thujaplicin, because inhibiting H2 O2 production or removing H2 O2 from the cell cultures suppressed elicitor-induced β-thujaplicin accumulation, while exogenously applied H2 O2 or H2 O2 generation system can stimulate β-thujaplicin accumulation. • Both NAD(P)H oxidase inhibitors and peroxidase inhibitors partially inhibited NAD(P)H-dependent O2 - and H2 O2 production. In-gel assay of peroxidase and superoxide anion synthase activity demonstrated that peroxidase isoforms have NAD(P)H-dependent superoxide anion synthase activity. These results suggest that peroxidases can act as superoxide anion synthases to contribute to genecation of H2 O2 that promotes β-thujaplicin production in elicited C. lusitanica cell cultures |
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| Beschreibung: | Date Revised 20.04.2021 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1046/j.1469-8137.2003.00841.x |