Maturation in Corymbia torelliana × C. citriodora stock plants: effects of pruning height on shoot production, adventitious rooting capacity, stem anatomy, and auxin and abscisic acid concentrations

Ivar Wendling; Paul Warburton; Stephen J Trueman

doi:10.3390/f6103763

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Maturation in Corymbia torelliana × C. citriodora stock plants: effects of pruning height on shoot production, adventitious rooting capacity, stem anatomy, and auxin and abscisic acid concentrations

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Maturation in Corymbia torelliana × C. citriodora stock plants: effects of pruning height on shoot production, adventitious rooting capacity, stem anatomy, and auxin and abscisic acid concentrations

Ivar Wendling, Paul Warburton and Stephen J Trueman

Forests, Vol.6, pp.3763-3778

2015

DOI: https://doi.org/10.3390/f6103763

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Abstract

adventitious roots

Eucalyptus

juvenility

plant hormones

propagation

Repeated pruning of stock plants is a common approach to delaying maturation and maintaining the propagation ability of cuttings, but little is known about the hormonal or anatomical basis for this phenomenon. We tested the effect of two different stock-plant pruning heights (15 cm and 30 cm) on shoot production, rooting capacity and rooted cutting vigour of six clones of the eucalypt Corymbia torelliana × C. citriodora. We determined whether differences in rooting potential were related to indole-3-acetic (IAA) and abscisic acid (ABA) concentrations, or the degree of lignification or sclerification, of the cuttings. Maintaining stock plants at 15 cm height sometimes reduced the production of stem cuttings. However, it often increased the ensuing percentage of cuttings that formed roots, with mean rooting across all clones increasing from 30%-53%. Therefore, the number of rooted cuttings produced by short stock plants was similar to, or higher than, the number produced by tall stock plants. Cuttings from shorter stock plants had faster root elongation and occasionally greater root dry mass, shoot dry mass or shoot height than cuttings from tall stock plants. These differences in rooting potential were generally not related to differences in IAA or ABA concentrations of the cuttings or to differences in their stem anatomy. Pruning at the lower height was more effective in maintaining clonal juvenility, supporting previous findings that stock plant maturation is a limiting factor in clonal propagation of Corymbia torelliana × C. citriodora.

Details

Title: Maturation in Corymbia torelliana × C. citriodora stock plants: effects of pruning height on shoot production, adventitious rooting capacity, stem anatomy, and auxin and abscisic acid concentrations
Authors: Ivar Wendling (Author) - Embrapa Florestas, Brazil
Paul Warburton (Author) - CSIRO
Stephen J Trueman (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: Forests, Vol.6, pp.3763-3778
Publisher: MDPI AG
Date published: 2015
DOI: 10.3390/f6103763
ISSN: 1999-4907
Copyright note: Copyright © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; GeneCology Research Centre - Legacy
Language: English
Record Identifier: 99449570702621
Output Type: Journal article

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