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Forests 2015, 6(4), 1227-1238; doi:10.3390/f6041227

Stem Anatomy and Adventitious Root Formation in Cuttings of Angophora, Corymbia and Eucalyptus

1
Genecology Research Centre, University of the Sunshine Coast, Maroochydore DC, QLD 4558, Australia
2
Queensland Department of Agriculture and Fisheries, PO Box 5083 SCMC, Nambour, QLD 4560, Australia
*
Author to whom correspondence should be addressed.
Academic Editors: Fei-Hai Yu and Eric J. Jokela
Received: 3 March 2015 / Revised: 2 April 2015 / Accepted: 13 April 2015 / Published: 15 April 2015
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Abstract

Many plantation eucalypts are difficult to propagate from cuttings, and their rooted cuttings often possess very few adventitious roots. We microscopically examined the stem anatomy of cuttings from 12 species of eucalypts and we determined whether adventitious root formation in auxin-treated cuttings of four species was limited to particular positions around the vascular tissue. Most species contained a central pith that was arranged in a four-pointed stellate pattern. The surrounding vascular tissue was also arranged in a stellate pattern near the shoot apex but it developed a more rectangular shape at the outer phloem as the stems enlarged radially. Adventitious roots formed at, or slightly peripheral to, the vascular cambium, and they formed at both the corners and the sides of the rectangular-shaped vascular tissue. The study highlighted that auxin-treated eucalypt cuttings can produce roots at multiple positions around the vascular tissue and so propagation methods can aim to produce more than four adventitious roots per rooted cutting. Higher numbers of adventitious roots could improve the root system symmetry, stability, survival and growth rate of clonal eucalypt trees. View Full-Text
Keywords: auxin; clonal forestry; eucalypts; morphology; nursery; propagation; rooting; tissue culture auxin; clonal forestry; eucalypts; morphology; nursery; propagation; rooting; tissue culture
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bryant, P.H.; Trueman, S.J. Stem Anatomy and Adventitious Root Formation in Cuttings of Angophora, Corymbia and Eucalyptus. Forests 2015, 6, 1227-1238.

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