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5.01.01 – Biological control of wood quality
Roni Aloni, Israel
About Unit
This Working Party provides a form for correspondence and discussion on the biological mechanisms that control cell wall formation, cambium activity and xylem differentiation. Since the wood is induced and controlled by hormonal signals, this party encourages exchange of information on how growth regulators regulate the formation and quality of wood. More specifically, how hormones as auxin, gibberellin, cytokinin and ethylene induce and control the differentiation of wood cells like fibers, tracheids and vessels.
New technologies and molecular markers enable to visualize the sites of hormone production (Figure 1A), their flow pathways (Fig. 1A, B) and their role in xylem formation and regeneration (Fig. 1C). Understanding the biological control of wood formation enables to improve wood quality and productivity in forest trees.
Figure 1. Photographs showing:
(A) site of auxin production (arrow) in a leaf (detected by strong blue DR5::GUS staining), from which a decreasing pattern of blue staining marks the pathway of auxin towards the differentiating vessels (arrowhead), which are induced by the auxin flow (B) auxin transport through the cambium and the differentiating vessels (all show blue spots of DR5::GUS staining, located in front and beside the arrows) forming radii patterns adjacent to the latest formed vessels (v), likely indicating the sites where new vessels will differentiate, and (C) regeneration of vessels (arrowhead) was induced around a wound (w) by auxin applied to a decapitated stem immediately after the leaves and buds above it were excised (the arrow shows the direction of auxin movement which induced the regenerated vessels). --- Click figure to enlarge---
State of Knowledge
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