- Standardsignatur4370
- TitelInfluence of the air temperature on the kinetics of tracheid formation in Norway spruce (Picea abies [L.] Karst.).
- VerfasserOliver Dünisch (*)Reinhard Lieberei (*)Gerald Koch (*)
- ErscheinungsortHamburg
- VerlagMax Wiedebusch
- Erscheinungsjahr2007
- SeitenS. 77-86
- Illustrationen9 Abb., 21 Lit. Ang.
- MaterialArtikel aus einer ZeitschriftUnselbständiges Werk
- Datensatznummer200151615
- QuellePlant Cell Wall : Recent Advances and New Perspectives : Proceedings of the 2nd New Zealand-German Workshop on Plant Cell Walls, S. 77-86
- AbstractThe kinetics of xylem formation of two-year-old plants of Picea abies [L.] Karst exposed to different air temperatures were studied in a model system. We simulated a continuous decrease of the air temperature from 26 to 2 degrees C (experiment 1) and an abrupt decrease of the air temperature from 10 to 5 degrees C (experiment 2). The kinetics of cell development were registered by high resolution laser measurements in combination with microscopical methods (accuracy: +-2 micrometer, spatial resolution of 12.1 to 38.43 micrometer, temporal resolution = 1 s). In experiment 1 the offset of cambial cell divisions was induced at higher temperature (<8 degrees C) than the offset of the subsequent steps of cell development (cell expansion (<6 degrees C), secondary wall formation (<5 degrees C), and lignification (<2 degrees C)). The abrupt decrease of the temperature from 10 to 5 degrees C (experiment 2) interrupted cell expansion, but secondary wall formation and lignification kept unaffected. From the results it is concluded that to a certain level complete tracheid formation is guaranteed at the end of the vegetation period by the differing critical temperatures for cambial cell divisions, the formation of the secondary cell wall, and the lignification. However, a fast and abrupt decrease of the temperature can interrupt developmental steps of xylem formation and can cause incomplete tracheid formation.
- SchlagwörterPicea abies, kambiales Wachstum, Xylem, Tracheid, Temperatureinfluss, Klimaänderung
- Klassifikation811.18 (Xylem)
811.151 (Tracheiden)
181.22 (Beziehungen zur Temperatur)
174.7 (Coniferae [Siehe Anhang D])
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