This title appears in the Scientific Report :
1999
Please use the identifier:
http://hdl.handle.net/2128/20260 in citations.
Einfluss verschiedener Stressfaktoren auf die Emission pflanzlicher flüchtiger organischer Verbindungen
Einfluss verschiedener Stressfaktoren auf die Emission pflanzlicher flüchtiger organischer Verbindungen
Emissions of Volatile Organic Compounds (VOCs) from several biosynthetic pathways were investigated. Beside the well-known emissions of terpenes, that are synthesized from dimethylallyl pyrophosphate (DMAPP), emissions following lipoxygenase (LOX) activity or from the shikimate pathway were found ....
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Personal Name(s): | Heiden, A. C. (Corresponding author) |
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Kobel, K. / Wildt, J. | |
Contributing Institute: |
Chemie der belasteten Atmosphäre; ICG-2 |
Imprint: |
Jülich
Forschungszentrum, Zentralbibliothek
1999
|
Dissertation Note: |
Duisburg, Univ., Diss., 1999 |
Document Type: |
Book Dissertation / PhD Thesis |
Research Program: |
Chemie der Belasteten Atmosphäre |
Series Title: |
Berichte des Forschungszentrums Jülich
3622 |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Emissions of Volatile Organic Compounds (VOCs) from several biosynthetic pathways were investigated. Beside the well-known emissions of terpenes, that are synthesized from dimethylallyl pyrophosphate (DMAPP), emissions following lipoxygenase (LOX) activity or from the shikimate pathway were found . Furthermore, it was shown that several VOCs like toluene and C6- to C lo-aldehydes, where no biosynthetical pathway is known, are emitted by plants. For monoterpene emissions it was shown that: o Absolute emission rates vary for different vegetative stages. ® Despite these differences in absolute emission rates the dependencies of the emission rates on temperature and light intensity can be described independent of the vegetative state with the same set of parameters using the algorithm of SCHUH ETAL. (1997). Just the standard emission rates are dependent on the vegetative state. q Emissions of monoterpenes from rape are limited by the availability of DMAPP . This limitation is independent on the vegetative state and therefore, a description of emissions with the same set of parameters is possible. • Exposure of rape plants with high amounts of ozone (130-170 ppb 0 3) leads to reduced emissions of monoterpenes that can be explained by a reduced DMAPP availability. ® The underlying model idea of the algorithm of SCHUH ET AL. (1997) that monoterpenes are emitted from two independent mechanisms was confinned by isotopic measurements . The model idea was extended to isoprene. • Mechanical wounding results in increased emissions of monoterpenes from sunflower and tomato. • As a result of nitrate deficiency monoterpene emissions are increased for rape and sunfiower. For sunflower an exponential increase of emission rates on a time scale of hundred to several hundred hours was found. ® Emissions of sesquiterpenes that are synthesized by the same biochemical pathway as isoprene and monoterpenes cannot be described by the algorithm of SCHUH ET AL. (1997) . Theses compounds are effective phytoalexins . They are actively produced by the plants after action of stress factors (stressors) on the plants . Therefore, the sesquiterpene emissions show a time dependency that cannot be described by the algorithm of .`iGHUH AL. (1997). Emissions of compounds resulting from LOX activity were quantified for the first time. lt was found that: ® Beside the well-known emissions of C 6-alcohols and -aldehydes several other compounds are emitted during LOX activity . |