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Gewählte Publikation:

Felhofer, M; Prats-Mateu, B; Bock, P; Gierlinger, N.
(2018): Antifungal stilbene impregnation: transport and distribution on the micron-level
TREE PHYSIOL. 2018; 38(10): 1526-1537. FullText FullText_BOKU

The transition from the living water-transporting sapwood to heartwood involves in many tree species impregnation with extractives. These differ in amount and composition, and enhance resistance against bacteria, insects or fungi. To understand the synthesis, transport and impregnation processes new insights into the biochemical processes are needed by in-situ methods. Here we show the extractive distribution in pine (Pinus sylvestris) microsections with a high lateral resolution sampled in a nondestructive manner using Confocal Raman Microscopy. Integrating marker bands of stilbenes and lipids enables to clearly track the rapid change from sapwood to heartwood within one tree ring. The higher impregnation of the cell corner, compound middle lamella, the S3 layer and pits reveals the optimization of decay resistance on the micron-level. Furthermore, deposits with changing chemical composition are elucidated in the rays and lumen of the tracheids. The spectral signature of these deposits shows the co-location of lipids and pinosylvins with changing ratios from the living to the dead tissue. The results demonstrate that the extractive impregnation on the micro-and nano-level is optimized by a symbiotic relationship of lipids and pinosylvins to enhance the tree's resistance and lifetime.
Autor/innen der BOKU Wien:
Bock Peter
Felhofer Martin
Gierlinger Notburga
Prats Mateu Batirtze
BOKU Gendermonitor:

Find related publications in this database (Keywords)
Confocal Raman Microscopy
heartwood formation

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