Abstract
Koromiko [Hebe salicifolia G. Forst. (Pennell)] is a woody angiosperm native to New Zealand and Chile. Hebe spp. belong to the otherwise herbaceous family Plantaginaceae in the order Lamiales. Reaction wood exerting expansional forces was found on the lower side of leaning H. salicifolia stems. Such reaction wood is atypical for angiosperms, which commonly form contracting reaction wood on the upper side of leaning stems. Reaction wood typical for angiosperms is formed by species in other families in the order Lamiales. This suggests that the form of reaction wood is specific to the family level. Functionally the reaction wood of H. salicifolia is similar to that found in gymnosperms, which both act by pushing. However, their chemical, anatomical and physical characteristics are different. Typical features of reaction wood present in gymnosperms such as high density, thick-walled rounded cells and the presence of (1 → 4)-β-galactan in the secondary cell wall layer are absent in H. salicifolia reaction wood. Reaction wood of H. salicifolia varies from normal wood in having a higher microfibril angle, which is likely to determine the direction of generated maturation stresses.
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Abbreviations
- FITC:
-
Fluorescein isothiocyanate
- H-units:
-
p-Hydroxyphenyl-units
- L:
-
Longitudinal
- LRS:
-
Longitudinally released strain
- MFA:
-
Microfibril angle
- R:
-
Radial
- S2:
-
Secondary wall layer 2
- S3:
-
Secondary wall layer 3
- S2(L):
-
Highly lignified outer secondary wall layer 2 in compression wood
- T:
-
Tangential
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Acknowledgments
This work was supported by the Nagoya University Global COE Program “From Earth System Science to Basic and Clinical Environmental Studies” of the Japanese Ministry of Education, Culture, Sports, Science and Technology and JSPS “Institutional Program for Young Researcher Overseas Visits”. We thank Dr D. Collings (University of Canterbury) for support with the fluorescence microscopy Prof P. Harris and M. Brennan (University of Auckland) for the help with the monosaccharide analysis.
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Kojima, M., Becker, V.K. & Altaner, C.M. An unusual form of reaction wood in Koromiko [Hebe salicifolia G. Forst. (Pennell)], a southern hemisphere angiosperm. Planta 235, 289–297 (2012). https://doi.org/10.1007/s00425-011-1503-z
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DOI: https://doi.org/10.1007/s00425-011-1503-z