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| Titel |
Technical Note: Methionine, a precursor of methane in living plants |
| VerfasserIn |
K. Lenhart, F. Althoff, M. Greule, F. Keppler |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 6 ; Nr. 12, no. 6 (2015-03-23), S.1907-1914 |
| Datensatznummer |
250117876
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| Publikation (Nr.) |
 copernicus.org/bg-12-1907-2015.pdf |
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| Zusammenfassung |
| When terrestrial plants were identified as producers of the greenhouse gas
methane,
much discussion and debate ensued not only about their contribution to the global
methane budget but also with regard to the validity of the observation itself. Although
the phenomenon has now become more accepted for both living and dead plants, the
mechanism of methane formation in living plants remains to be elucidated and its
precursor compounds to be identified. We made use of stable isotope techniques to verify the in
vivo formation of methane, and, in order to identify the carbon precursor, 13C positionally
labeled organic compounds were employed. Here we show that the amino
acid L-methionine acts as a methane precursor in living plants. Employing 13C-labeled
methionine clearly identified the sulfur-bound methyl group of methionine as a carbon
precursor of methane released from lavender (Lavandula angustifolia). Furthermore,
when lavender plants were stressed physically, methane release rates and the stable
carbon isotope values of the emitted methane greatly increased.
Our results provide additional support that plants possess a mechanism for methane
production and suggest that methionine might play an important role in the formation of
methane in living plants, particularly under stress conditions. |
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