Nutrient partitioning among the roots, hedge and cuttings of Corymbia citriodora stock plants

Trueman, Stephen J.; McMahon, Tracey V.; Bristow, Mila

doi:10.4067/s0718-95162013005000077

Cited by 10 publications

(6 citation statements)

References 50 publications

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“…IAA concentrations are also similar between nodes of Corymbia torelliana × C. citriodora seedlings that differ in rooting capacity, and also between cuttings from C. torelliana × C. citriodora stock plants of different heights that differ in rooting capacity [110,129,171]. The rooting response of a tissue can be regulated by many factors other than auxins, including the sensitivity of cells to the auxin signal [165], the concentrations of rooting inhibitors in the base of cuttings [165], the levels of minerals and carbohydrates [172][173][174][175][176][177][178], and the degree of lignification or sclerification of the stem [33,110,179,180].…”

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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“…The plants were maintained in an Adaptis A1000 growth chamber (Conviron, Winnipeg, Canada) with a photoperiod of 14 h (~500 μmol·m −2 ·s −1 irradiance) at 25 °C and darkness for 10 h at 15 °C. The seedlings were managed as stock plants with multiple orthotropic shoots by pruning at regular intervals to a height of 15-30 cm and a canopy diameter of ~20 cm [10,11,31,32].…”

Section: Stock Plants and Cuttingsmentioning

confidence: 99%

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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“…Samples were also collected from three C. torelliana trees on the Sunshine Coast (26°42′ S, 153°02′ E), Australia. C. citriodora , and hybrids between C. citriodora and C. torelliana , are grown extensively in forestry plantations [ 54 , 55 , 56 , 57 , 58 , 59 , 60 ] but C. torelliana is rarely grown in plantations, partly because of its invasive potential [ 21 , 25 ]. Therefore, the three samples of C. torelliana were obtained from isolated trees in amenity plantings.…”

Section: Methodsmentioning

confidence: 99%

Antibacterial Properties of Flavonoids from Kino of the Eucalypt Tree, Corymbia torelliana

Nobakht¹,

Trueman²,

Wallace³

et al. 2017

Plants

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Traditional medicine and ecological cues can both help to reveal bioactive natural compounds. Indigenous Australians have long used kino from trunks of the eucalypt tree, Corymbia citriodora, in traditional medicine. A closely related eucalypt, C. torelliana, produces a fruit resin with antimicrobial properties that is highly attractive to stingless bees. We tested the antimicrobial activity of extracts from kino of C. citriodora, C. torelliana × C. citriodora, and C. torelliana against three Gram-negative and two Gram-positive bacteria and the unicellular fungus, Candida albicans. All extracts were active against all microbes, with the highest activity observed against P. aeruginosa. We tested the activity of seven flavonoids from the kino of C. torelliana against P. aeruginosa and S. aureus. All flavonoids were active against P. aeruginosa, and one compound, (+)-(2S)-4′,5,7-trihydroxy-6-methylflavanone, was active against S. aureus. Another compound, 4′,5,7-trihydroxy-6,8-dimethylflavanone, greatly increased biofilm formation by both P. aeruginosa and S. aureus. The presence or absence of methyl groups at positions 6 and 8 in the flavonoid A ring determined their anti-Staphylococcus and biofilm-stimulating activity. One of the most abundant and active compounds, 3,4′,5,7-tetrahydroxyflavanone, was tested further against P. aeruginosa and was found to be bacteriostatic at its minimum inhibitory concentration of 200 µg/mL. This flavanonol reduced adhesion of P. aeruginosa cells while inducing no cytotoxic effects in Vero cells. This study demonstrated the antimicrobial properties of flavonoids in eucalypt kino and highlighted that traditional medicinal knowledge and ecological cues can reveal valuable natural compounds.

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Nutrient partitioning among the roots, hedge and cuttings of Corymbia citriodora stock plants

Cited by 10 publications

References 50 publications

The Use of Auxin Quantification for Understanding Clonal Tree Propagation

The Use of Auxin Quantification for Understanding Clonal Tree Propagation

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

Antibacterial Properties of Flavonoids from Kino of the Eucalypt Tree, Corymbia torelliana

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