Effect of aminoethoxyvinylglycine and 1-methylcyclopropene on leaf abscission and root formation in Corymbia and Eucalyptus cuttings

Trueman, Stephen J.; Adkins, Matthew F.

doi:10.1016/j.scienta.2013.06.048

Cited by 16 publications

(9 citation statements)

References 49 publications

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“…As a result, short stock plants had a similar or higher multiplication rate than tall stock plants. Mean rooting percentages for cuttings from the tall stock plants (30%) were comparable to those from nursery stock plants of C. torelliana × C. citriodora that were pruned at the same height (30 cm) in previous studies; i.e., 30% [32], 31% [30], 34% [34] and 46% [21]. In contrast, mean rooting percentages for cuttings from the short stock plants (53%) were closer to those from cuttings harvested directly from 10-node seedlings (61%) [20].…”

Section: Discussionsupporting

confidence: 58%

“…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%

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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

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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Section: Discussionsupporting

confidence: 58%

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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“…Many untreated eucalypt shoots produce just one or two adventitious roots [16,[18][19][20]37,[44][45][46]. Optimally-treated eucalypt shoots often produce a mean of about four adventitious roots but individual shoots can produce higher root numbers [3,4,9,17,[19][20][21][22][23][24]47,48].…”

Section: Discussionmentioning

confidence: 99%

“…Optimally-treated eucalypt shoots often produce a mean of about four adventitious roots but individual shoots can produce higher root numbers [3,4,9,17,[19][20][21][22][23][24]47,48]. These roots could have emerged along more than four radii at the same level within the shoot.…”

Section: Discussionmentioning

confidence: 99%

“…Other aspects of tree growth can also be affected by the number of adventitious roots; e.g., raising the number of adventitious roots from one to five in Pinus cuttings increases subsequent tree survival, height and trunk diameter [13][14][15]. Adventitious root number in eucalypts can be elevated by auxin rooting hormones [16][17][18][19][20], with many studies finding that the most effective treatments induce approximately four adventitious roots per eucalypt shoot [3,17,[19][20][21][22][23][24][25]. Adventitious roots of some easy-to-propagate woody plants are formed in longitudinal rows along the stem, with the positions being related to the anatomy of the underlying vascular tissue [26].…”

Section: Introductionmentioning

confidence: 99%

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

Bryant

Trueman

2015

Forests

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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.

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Topophysis in Corymbia torelliana × C. citriodora seedlings: adventitious rooting capacity, stem anatomy, and auxin and abscisic acid concentrations

2014

Self Cite

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Low amenability of the eucalypt, Corymbia torelliana 9 C. citriodora, to vegetative propagation has limited its establishment in plantations. This study determined whether rooting capacity and cutting vigour varied along the central shoot of Corymbia seedlings, and whether these differences are related to stem development and hormone concentrations. Dual-node cuttings were harvested from five positions (nodes 1/2, 3/4, 5/6, 7/8 and 9/10) along the seedling shoot (S1), and cuttings were treated with one of four levels of indole-3-butyric acid (IBA). Root formation, root and shoot growth, stem anatomy, and the concentrations of indole-3-acetic (IAA) and abscisic acid (ABA) were assessed at each shoot position. The central node of the rooted cuttings was harvested for fresh cuttings to observe whether maturation emerged in ramets (S2) from the different ortet positions. Rooting and vigour were highest from the most-apical seedling nodes (7/8 and 9/10 in S1), which had less lignification and sclerenchyma development than morebasal nodes (1/2, 3/4 and 5/6). IAA and ABA concentrations differed little between the seedling nodes. In contrast, cuttings from the ramets (in S2) had similar rooting, vigour, lignification and sclerification to each other, but there were large differences in IAA and ABA concentrations depending on their previous point-of-origin in the seedling. High doses of IBA reduced rooting. Rooting and vigour were related to lignification and sclerenchyma development rather than IAA or ABA concentrations. Mass vegetative propagation of C. torelliana 9 C. citriodora is achievable because mean rooting percentages in S1 and S2 were 61 and 68 %, respectively, using cuttings from small seedling ortets and their ramets.

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Effect of aminoethoxyvinylglycine and 1-methylcyclopropene on leaf abscission and root formation in Corymbia and Eucalyptus cuttings

Cited by 16 publications

References 49 publications

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

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

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

Topophysis in Corymbia torelliana × C. citriodora seedlings: adventitious rooting capacity, stem anatomy, and auxin and abscisic acid concentrations

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