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

Bryant, Philippa H.; Trueman, Stephen J.

doi:10.3390/f6041227

Cited by 52 publications

(33 citation statements)

References 38 publications

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“…Much of this research has focused on determining the appropriate combinations of auxin concentration, application formulation, and application method that result in the highest percentages of shoots forming roots [109,154,155]. Auxins are used primarily to increase plant production by improving rooting percentages, but they can also improve plant quality parameters such as adventitious root number, root system symmetry, and root:shoot ratio [37,38,155,156]. These parameters can have important impacts on tree stability, tree survival, and trunk volume in the nursery and the plantation.…”

Section: Auxin Dynamics During Vegetative Propagationmentioning

confidence: 99%

The Use of Auxin Quantification for Understanding Clonal Tree Propagation

Stuepp

Wendling

Trueman

et al. 2017

Forests

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Qualitative and quantitative hormone analyses have been essential for understanding the metabolic, physiological, and morphological processes that are influenced by plant hormones. Auxins are key hormones in the control of many aspects of plant growth and development and their endogenous levels are considered critical in the process of adventitious root induction. Exogenous auxins are used extensively in the clonal propagation of tree species by cuttings or tissue culture. Understanding of auxin effects has advanced with the development of increasingly accurate methods for auxin quantification. However, auxin analysis has been challenging because auxins typically occur at low concentrations, while compounds that interfere with their detection often occur at high concentrations, in plant tissues. Interference from other compounds has been addressed by extensive purification of plant extracts prior to auxin analysis, although this means that quantification methods have been limited by their expense. This review explores the extraction, purification, and quantification of auxins and the application of these techniques in developing improved methods for the clonal propagation of forestry trees.

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Section: Auxin Dynamics During Vegetative Propagationmentioning

confidence: 99%

The Use of Auxin Quantification for Understanding Clonal Tree Propagation

Stuepp

Wendling

Trueman

et al. 2017

Forests

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“…However, cuttings are normally harvested from larger stock plants that have been raised from cuttings (i.e., ramets). Stock plants of Eucalyptus and Corymbia in Australia are often maintained by pruning at ~30-cm height [21][22][23][24] whereas eucalypt nurseries in Brazil use shorter stock plants to maintain clonal juvenility [1,2,[25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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

Wendling

Warburton

Trueman

2015

Forests

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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 OPEN ACCESSForests 2015, 6 3764 findings that stock plant maturation is a limiting factor in clonal propagation of Corymbia torelliana × C. citriodora.

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“…The fully extended feeding stylets of each instar are longer than the insect's body (e.g., about four times as long for some adult females) but even the adult female's 2 mm long stylets might not be able to reach the phloem on a main branch or trunk of an Angophora tree. The cortex lies below the epidermis on the stem or trunk of Angophora (Chattaway 1953;Bryant & Trueman 2015) and probably these insects feed from cortical parenchyma tissue.…”

Section: Taxonomymentioning

confidence: 99%

A new pupillarial scale insect (Hemiptera: Coccoidea: Eriococcidae) from Angophora in coastal New South Wales, Australia

Gullan

Williams

2016

Zootaxa

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A new scale insect, Aolacoccus angophorae gen. nov. and sp. nov. (Eriococcidae), is described from the bark of Angophora (Myrtaceae) growing in the Sydney area of New South Wales, Australia. These insects do not produce honeydew, are not ant-tended and probably feed on cortical parenchyma. The adult female is pupillarial as it is retained within the cuticle of the penultimate (second) instar. The crawlers (mobile first-instar nymphs) emerge via a flap or operculum at the posterior end of the abdomen of the second-instar exuviae. The adult and second-instar females, second-instar male and first-instar nymph, as well as salient features of the apterous adult male, are described and illustrated. The adult female of this new taxon has some morphological similarities to females of the non-pupillarial palm scale Phoenicococcus marlatti Cockerell (Phoenicococcidae), the pupillarial palm scales (Halimococcidae) and some pupillarial genera of armoured scales (Diaspididae), but is related to other Australian Myrtaceae-feeding eriococcids.

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

Cited by 52 publications

References 38 publications

The Use of Auxin Quantification for Understanding Clonal Tree Propagation

The Use of Auxin Quantification for Understanding Clonal Tree Propagation

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

A new pupillarial scale insect (Hemiptera: Coccoidea: Eriococcidae) from Angophora in coastal New South Wales, Australia

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