期刊
IAWA JOURNAL
卷 36, 期 1, 页码 44-57出版社
BRILL
DOI: 10.1163/22941932-00000084
关键词
Gelatinous layer; secondary wall layer; developing xylem; maturation stress; tree biomechanics
类别
资金
- SCAC (Service de Cooperation et d'Action Culturelle) of the French embassy in Tehran
- Iranian center of Excellency on applied management of fast growing wooden species
- French National Research Agency [ANR-12-BS09-0004]
- Agence Nationale de la Recherche (ANR) [ANR-12-BS09-0004] Funding Source: Agence Nationale de la Recherche (ANR)
Trees can control their shape and resist gravity thanks to their ability to produce wood under tensile stress. This stress is known to be produced during the maturation of wood fibres but the mechanism of its generation remains unclear. This study focuses on the formation of the secondary wall in tension wood produced in artificially tilted poplar saplings. Thickness of secondary wall layer (SL) and gelatinous layer (GL) were measured from cambium to mature wood in several trees sampled at different times after tilting. Measurements on wood fibres produced before tilting show the progressive increase of secondary wall thickness during the growing season. After the tilting date, SL thickness decreased markedly from normal wood to tension wood while the total thickness increased compared to normal wood, with the development of a thick GL. However, even after GL formation, SL thickness continues to increase during the growing season. GL thickening was observed to be faster than SL thickening. The development of the unlignified GL is proposed to be a low cost, efficient strategy for a fast generation of tensile stress in broadleaved trees.
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