Characterizing compression wood formed in radiata pine branches
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Department of Biotechnology, Beijing Forestry University, Beijing 100083, China
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Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Swedenharry.wu@csiro.au
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The formation of reaction wood is an adaptive feature of trees in response to various mechanical forces. In gymnosperms, reaction wood consists of compression wood (CW) and opposite wood (OW) that are formed on the underside and upperside of bent trunks and branches. Although reaction wood formed in bent trunks has been extensively investigated, relatively little has been reported from conifer branches. In this study SilviScan® technology was used to characterize radiata pine branches at high resolution. Compared to OW formed in the branches, CW showed greater growth, darker colour, thicker tracheid walls, higher coarseness, larger microfibril angle (MFA), higher wood density, lower extensional stiffness and smaller internal specific surface area. However, tracheids of CW were similar to those of OW in their radial and tangential diameters. These results indicated that gravity influenced tracheid cell division and secondary wall formation but had limited impact on primary wall expansion. Furthermore, seasonal patterns of CW formation were not observed in the branches from cambial age 4 while earlywood and latewood were clearly separated in all rings of OW. The marked change of MFA during reaction wood formation suggested that branches could be ideal materials for further study of cellulose microfibril orientation.
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Characterizing compression wood formed in radiata pine branches
In: IAWA JournalSearch for other papers by Xinguo Li in
Current site
Google Scholar
PubMed
Search for other papers by Robert Evans in
Current site
Google Scholar
PubMed
Search for other papers by Washington Gapare in
Current site
Google Scholar
PubMed
Department of Biotechnology, Beijing Forestry University, Beijing 100083, China
Search for other papers by Xiaohui Yang in
Current site
Google Scholar
PubMed
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Swedenharry.wu@csiro.au
Search for other papers by Harry X. Wu in
Current site
Google Scholar
PubMed
The formation of reaction wood is an adaptive feature of trees in response to various mechanical forces. In gymnosperms, reaction wood consists of compression wood (CW) and opposite wood (OW) that are formed on the underside and upperside of bent trunks and branches. Although reaction wood formed in bent trunks has been extensively investigated, relatively little has been reported from conifer branches. In this study SilviScan® technology was used to characterize radiata pine branches at high resolution. Compared to OW formed in the branches, CW showed greater growth, darker colour, thicker tracheid walls, higher coarseness, larger microfibril angle (MFA), higher wood density, lower extensional stiffness and smaller internal specific surface area. However, tracheids of CW were similar to those of OW in their radial and tangential diameters. These results indicated that gravity influenced tracheid cell division and secondary wall formation but had limited impact on primary wall expansion. Furthermore, seasonal patterns of CW formation were not observed in the branches from cambial age 4 while earlywood and latewood were clearly separated in all rings of OW. The marked change of MFA during reaction wood formation suggested that branches could be ideal materials for further study of cellulose microfibril orientation.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 49 | 0 | 0 |
| Full Text Views | 464 | 97 | 6 |
| PDF Views & Downloads | 319 | 119 | 19 |
