Abstract
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The collapse of some cell types and the simultaneous growth or expansion of others hinder the estimation of the contribution of individual tissues to the variation of bark dimension over time.
Abstract
Information on the spatio-temporal pattern of secondary changes occurring in older bark, as well as the activity of phellogen and the development of periderm is still relatively scarce. Anatomical and histometrical investigations were carried out on the bark of mature Quercus petraea growing in Ljubljana, Slovenia. The bark of the oaks was on average 19 mm thick, with the inner bark and the rhytidome accounting for 39 and 61 %, respectively. A high correlation was found between the widths of the rhytidome and of the entire bark, but a fairly weak one between inner bark and entire bark. The youngest phloem increment on average represented around 5 % of the inner bark and around 2.1 % of the entire bark. Growth-ring boundaries were not distinguishable in the collapsed phloem; however, counting the phloem increments was possible due to the presence of phloem fibres at the transition from early to late phloem. We also followed the spatial–temporal secondary changes in collapsed phloem tissue. Phloem increment development in Q. petraea showed that patterns of phloem formation at one location remained practically unchanged in different years. The relationship between processes occurring in different bark tissues is not linear. In addition to the high variability in bark, the collapse of some cell types and the simultaneous growth or expansion of others hinder the estimation of the contribution of individual tissues to the variation of bark dimension over time.
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Author contribution statement
J.G. together with P.P. developed the concept of the paper, wrote the paper, prepared the cross-sections and performed the wood-anatomical analysis, Š.J. prepared the figures, performed the wood-anatomical measurements, P.P. helped to develop the concept of the paper, helped to prepare the figures and measurements, wrote some parts of the results and discussion.
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The authors would like to thank the anonymous reviewers for their valuable comments and suggestions to improve the quality of the paper. The work was supported by the Slovenian Research Agency, program P4-0107 and project Z4-9662 and by EUFORINNO (RegPot No. 315982) of the FP7 Infrastructures programme. The authors would like to acknowledge the contribution of the COST Action FP1106, STReESS. We thank Martin Cregeen for language editing.
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The authors declare that they have no conflict of interest.
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Communicated by M. Shane.
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Gričar, J., Jagodic, Š. & Prislan, P. Structure and subsequent seasonal changes in the bark of sessile oak (Quercus petraea). Trees 29, 747–757 (2015). https://doi.org/10.1007/s00468-015-1153-z
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DOI: https://doi.org/10.1007/s00468-015-1153-z