Summary: Soil, roots, leaves, dormant buds affect stressed eucalypt seedlings if compacted, damaged below nodal position 1 and shorn of greenery and carbohydrates.
Eucalyptus obliqua grows in cool to warm humid and subhumid climates and survives such severe heat as temperatures generated by forest fires through the combined support of healthy soil, roots, leaves and dormant buds; Eucalyptus obliqua in habitat, Macedon Ranges, Central Victoria, southeastern Australia; Friday, Feb. 18, 2011, 15:40: Russell Best, CC BY 2.5 Australia, via Wikimedia Commons |
Soil, roots, leaves, dormant buds affect stressed eucalypt seedlings, according to an article by Gregory M. Moore of the University of Melbourne, Richmond, Australia, for Arboriculture & Urban Forestry of July 2021.
Root Tip Growth and the Presence of Leaves Affect Epicormic and Lignotuberous Shoot Development and Survival of Stressed Eucalyptus obliqua L’Herit. Seedlings broaches dormant-budded stress-recovery behavior. Axillary buds on canopy branches and, despite shoot mortalities of 50 percent, epicormic buds concealed under canopy-branch, lower-branch and trunk bark conduce to woody-plant stress-relieving regeneration. Lignotuberous shoots, deployed from stem-like basal burls developed from stem-base axillary buds, display, despite mortality rates of 50 to 100 percent, last-ditch defenses of stressed trees.
Heat stress at 40 degrees Celsius ends moist, nutritious uptake by roots and encourages lignotuberous buds, endowed through developmental plasticity, to embrace root- and shoot-like existences.
Two-minute-long 40 and 60 degrees Celsius with decapitation fostered no brown-tipped roots, contrastingly furnished respectively within 2 to 5 and 2 to 3 days without decapitation.
Stressed eucalypt seedlings guarded brown-tipped roots 2 to 3 days after two-minute-long heat at 80 degrees Celsius, whose stress guaranteed dead tips within another two minutes. Four-minute-long, eight-minute-long heat at 60 degrees Celsius heralded brown-tipped roots respectively never, within 2 to 3 days with decapitation, always 2 to 4 days without decapitation. Two-minute-long 40, 60, 80 degrees Celsius with, without decapitation initiated 12th- to 14th-day-, immediate-, 3rd- to 4th-day-, immediate-, 12th- to 15th-day-, 6th- to 10th-day-resumed root-tip regrowth.
Four-minute-long versus eight-minute-long 60 degrees Celsius with, without decapitation jeopardized root-tip growth within 8 to 12, 1 to 3, versus 10 to 13, 3 to 5 days.
Significant, two-minute-long heat stress at 80 degrees Celsius kindled second-, fifth-, sixth-, eighth-, ninth-, tenth-week root-tip, then epicormic-shoot growth, despite no-growth first, third, fourth, seventh weeks.
Root-tip growth 10 weeks after heating to 80 degrees Celsius lagged significantly behind that for greenhouse temperatures and after heating to 40 and 60 degrees Celsius. Leaf-nodal positions 1 through 3 at soil-level or subsoil-surface seedling bases manifested lignotuberous-budded shoots after heat massacred, or decapitation moved away, most or all epicormic buds. Stressed eucalypt seedlings, heated to 40, 60, 80, 100 degrees Celsius and leafless or two-, four-, eight-leaved, needed three to 22 days before netting new-shoot production.
Three experiments proved preferable dry-weight, height-increment, root-growth, shoot-production performances, over a 10-week period, provoked by prompt pruning, not procrastinated by one week, of unhealthy plant parts.
Only one of soil, roots, leaves, dormant buds never occasions guaranteed plant survival since epicormic and lignotuberous shoots never occur without oxygenated soil, roots and foliage.
Three experiments proved preferable dry-weight, height-increment, root-growth, shoot-production performances, over a 10-week period, provoked by prompt pruning, not procrastinated by one week, of unhealthy plant parts.
Two-, four-, eight-, eight-plus minutes at 60 degrees Celsius with foliage decapitated 100 percent or all but two, four, eight leaves queued decreasing-, downward-numbered nodal positions. Two-, four-, eight-minute durations at 40, 60, 80, 100 degrees Celsius revealed rising mortality of dormant-bud shoots, receding dry-weight, height-increment, nodal-position rises and reversed root-tip regrowth. Plasma-membrane, histone and protein sensors perhaps swiftly start, swiftly soar dry-weight, height-increment and shoot productions subsequent to stress at 60 degrees Celsius, then of immediate decapitation.
Soil, roots, leaves, dormant buds testing compacted, traumatized below first lignotubers, thinned of healthy, not still-there unhealthy, foliage, troubled over carbohydrates never treat stressed eucalypt seedlings.
Epicormic buds appear just under branch and stem bark of Eucalyptus obliqua and develop into epicormic shoots, as important parts of recovery responses to environmental stress; Messmate Stringybark (Eucalyptus obliqua) at Blackburn Lake, Box Hill, Melbourne, South Central Victoria, southeastern Australia; Saturday, May 30, 2009, 10:52: Arthur Chapman from Australia, CC BY 2.0 Generic, via Wikimedia Commons |
Acknowledgment
My special thanks to talented artists and photographers/concerned organizations who make their fine images available on the internet.
Image credits:
Image credits:
Eucalyptus obliqua grows in cool to warm humid and subhumid climates and survives such severe heat as temperatures generated by forest fires through the combined support of healthy soil, roots, leaves and dormant buds; Eucalyptus obliqua in habitat, Macedon Ranges, Central Victoria, southeastern Australia; Friday, Feb. 18, 2011, 15:40: Russell Best, CC BY 2.5 Australia, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:Eucalyptus_obliqua_habit.jpg; Russell Best, CC BY 2.5 Australia, via Atlas of Living Australia @ https://biocache.ala.org.au/occurrences/56b6cd4c-4e6a-4035-8c4b-ce04cc86d840
Epicormic buds appear just under branch and stem bark of Eucalyptus obliqua and develop into epicormic shoots, as important parts of recovery responses to environmental stress; Messmate Stringybark (Eucalyptus obliqua) at Blackburn Lake, Box Hill, Melbourne, South Central Victoria, southeastern Australia; Saturday, May 30, 2009, 10:52: Arthur Chapman from Australia, CC BY 2.0 Generic, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:Eucalyptus_obliqua_1.jpg
For further information:
For further information:
Gilman, Ed. 2011. An Illustrated Guide to Pruning. Third Edition. Boston MA: Cengage.
Hayes, Ed. 2001. Evaluating Tree Defects. Revised, Special Edition. Rochester MN: Safe Trees.
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Available @ https://earth-and-space-news.blogspot.com/2017/01/tree-fertilization-for-fine-root-growth.html
Marriner, Derdriu. 17 December 2016. “Abiotic and Biotic Stress in Low Maintenance Tree Health Care Programs.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/12/abiotic-and-biotic-stress-in-low.html
Available @ https://earth-and-space-news.blogspot.com/2016/12/abiotic-and-biotic-stress-in-low.html
Marriner, Derdriu. 19 November 2016. “Organic Amendments to Compacted Degraded Urban Highway Roadsides.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/11/organic-amendments-to-compacted.html
Available @ https://earth-and-space-news.blogspot.com/2016/11/organic-amendments-to-compacted.html
Marriner, Derdriu. 15 October 2016. “Tree Protection Zones by Arborists for All Construction Project Phases.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/10/tree-protection-zones-by-arborists-for.html
Available @ https://earth-and-space-news.blogspot.com/2016/10/tree-protection-zones-by-arborists-for.html
Marriner, Derdriu. 17 September 2016. “Stormwater Runoff Landscaping With Urban Canopy Cover and Groundcover.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/09/stormwater-runoff-landscaping-with.html
Available @ https://earth-and-space-news.blogspot.com/2016/09/stormwater-runoff-landscaping-with.html
Marriner, Derdriu. 13 August 2016. “Changing Places: Tree Nutrient Movement Down, Tree Water Movement Up.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/08/changing-places-tree-nutrient-movement.html
Available @ https://earth-and-space-news.blogspot.com/2016/08/changing-places-tree-nutrient-movement.html
Marriner, Derdriu. 16 July 2016. “Treated or Untreated Oriental Bittersweet Vine Management Cut-Stumping.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/07/treated-or-untreated-oriental.html
Available @ https://earth-and-space-news.blogspot.com/2016/07/treated-or-untreated-oriental.html
Marriner, Derdriu. 18 June 2016. “Tree Injection Site Procedures: Manufacturer's Instructions and Labels.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/06/tree-injection-site-procedures.html
Available @ https://earth-and-space-news.blogspot.com/2016/06/tree-injection-site-procedures.html
Marriner, Derdriu. 22 May 2016. “Electrical Utility Area Temperate Urban Street Trees: Pruned Regrowth.” Earth and Space News. Sunday.
Available @ https://earth-and-space-news.blogspot.com/2016/05/electrical-utility-area-temperate-urban.html
Available @ https://earth-and-space-news.blogspot.com/2016/05/electrical-utility-area-temperate-urban.html
Marriner, Derdriu. 16 April 2016. “Tree Injection Methods: Treatment Option in Integrated Pest Management.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/04/tree-injection-methods-treatment-option.html
Available @ https://earth-and-space-news.blogspot.com/2016/04/tree-injection-methods-treatment-option.html
Marriner, Derdriu. 6 March 2016. “Bare-Rooted Ornamental Urban Transplants: Amendments Against Mortality.” Earth and Space News. Sunday.
Available @ https://earth-and-space-news.blogspot.com/2016/03/bare-rooted-ornamental-urban.html
Available @ https://earth-and-space-news.blogspot.com/2016/03/bare-rooted-ornamental-urban.html
Marriner, Derdriu. 28 February 2016. “Bark Protective Survival Mechanisms Foil Deprivation, Injury, Invasion.” Earth and Space News. Sunday.
Available @ https://earth-and-space-news.blogspot.com/2016/02/bark-protective-survival-mechanisms.html
Available @ https://earth-and-space-news.blogspot.com/2016/02/bark-protective-survival-mechanisms.html
Marriner, Derdriu. 23 January 2016. "LITA Model: Linear Index of Tree Appraisal of Large Urban Swedish Trees." Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2016/01/lita-model-linear-index-of-tree.html
Available @ https://earth-and-space-news.blogspot.com/2016/01/lita-model-linear-index-of-tree.html
Marriner, Derdriu. 19 December 2015. “Tree Lightning Protection Systems: Site, Soil, Species True Designs.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2015/12/tree-lightning-protection-systems-site.html
Available @ https://earth-and-space-news.blogspot.com/2015/12/tree-lightning-protection-systems-site.html
Marriner, Derdriu. 24 October 2015. “Tree Lightning Protection Systems Tailored to Sites, Soils, Species.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2015/10/tree-lightning-protection-systems.html
Available @ https://earth-and-space-news.blogspot.com/2015/10/tree-lightning-protection-systems.html
Marriner, Derdriu. 15 August 2015. “Tree Friendly Urban Soil Management: Amend, Fertilize, Mulch, Till!” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2015/08/tree-friendly-urban-soil-management.html
Available @ https://earth-and-space-news.blogspot.com/2015/08/tree-friendly-urban-soil-management.html
Marriner, Derdriu. 13 June 2015. “Tree Friendly Urban Soil Management: Assemble, Assess, Assist, Astound.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2015/06/tree-friendly-urban-soil-management.html
Available @ https://earth-and-space-news.blogspot.com/2015/06/tree-friendly-urban-soil-management.html
Marriner, Derdriu. 18 April 2015. “Tree Wound Responses: Healthy Wound Closures by Callus and Woundwood.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2015/04/tree-wound-responses-healthy-wound.html
Available @ https://earth-and-space-news.blogspot.com/2015/04/tree-wound-responses-healthy-wound.html
Marriner, Derdriu. 15 February 2015. “Urban Forest Maintenance and Non-Maintenance Costs and Benefits.” Earth and Space News. Sunday.
Available @ https://earth-and-space-news.blogspot.com/2015/02/urban-forest-maintenance-and-non.html
Available @ https://earth-and-space-news.blogspot.com/2015/02/urban-forest-maintenance-and-non.html
Marriner, Derdriu. 13 December 2014. “Tree Dwelling Symbionts: Dodder, Lichen, Mistletoe, Moss and Woe-Vine.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2014/12/tree-dwelling-symbionts-dodder-lichen.html
Available @ https://earth-and-space-news.blogspot.com/2014/12/tree-dwelling-symbionts-dodder-lichen.html
Marriner, Derdriu. 18 October 2014. “Tree Cable Installation Systems Lessen Target Impact From Tree Failure.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2014/10/tree-cable-installation-systems-lessen.html
Available @ https://earth-and-space-news.blogspot.com/2014/10/tree-cable-installation-systems-lessen.html
Marriner, Derdriu. 16 August 2014. “Flood Tolerant Trees in Worst-Case Floodplain and Urbanized Scenarios.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2014/08/flood-tolerant-trees-in-worst-case.html
Available @ https://earth-and-space-news.blogspot.com/2014/08/flood-tolerant-trees-in-worst-case.html
Marriner, Derdriu. 14 June 2014. “Integrated Vegetation Management of Plants in Utility Rights-of-Way.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2014/06/integrated-vegetation-management-of.html
Available @ https://earth-and-space-news.blogspot.com/2014/06/integrated-vegetation-management-of.html
Marriner, Derdriu. 12 April 2014. “Tree Twig Identification: Buds, Bundle Scars, Leaf Drops, Leaf Scars.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2014/04/tree-twig-identification-buds-bundle.html
Available @ https://earth-and-space-news.blogspot.com/2014/04/tree-twig-identification-buds-bundle.html
Marriner, Derdriu. 15 February 2014. “Tree Twig Anatomy: Ecosystem Stress, Growth Rates, Winter Identification.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2014/02/tree-twig-anatomy-ecosystem-stress.html
Available @ https://earth-and-space-news.blogspot.com/2014/02/tree-twig-anatomy-ecosystem-stress.html
Marriner, Derdriu. 14 December 2013. “Community and Tree Safety Awareness During Line- and Road-Clearances.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2013/12/community-and-tree-safety-awareness.html
Available @ https://earth-and-space-news.blogspot.com/2013/12/community-and-tree-safety-awareness.html
Marriner, Derdriu. 13 October 2013. “Chain-Saw Gear and Tree Work Related Personal Protective Equipment.” Earth and Space News. Sunday.
Available @ https://earth-and-space-news.blogspot.com/2013/10/chain-saw-gear-and-tree-work-related.html
Available @ https://earth-and-space-news.blogspot.com/2013/10/chain-saw-gear-and-tree-work-related.html
Marriner, Derdriu. 12 October 2013. “Storm Damaged Tree Clearances: Matched Teamwork of People to Equipment.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2013/10/storm-damaged-tree-clearances-matched.html
Available @ https://earth-and-space-news.blogspot.com/2013/10/storm-damaged-tree-clearances-matched.html
Marriner, Derdriu. 17 August 2013. “Storm Induced Tree Damage Assessments: Pre-Storm Planned Preparedness.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2013/08/storm-induced-tree-damage-assessments.html
Available @ https://earth-and-space-news.blogspot.com/2013/08/storm-induced-tree-damage-assessments.html
Marriner, Derdriu. 15 June 2013. “Storm Induced Tree Failures From Heavy Tree Weights and Weather Loads.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2013/06/storm-induced-tree-failures-from-heavy.html
Available @ https://earth-and-space-news.blogspot.com/2013/06/storm-induced-tree-failures-from-heavy.html
Marriner, Derdriu. 13 April 2013. “Urban Tree Root Management Concerns: Defects, Digs, Dirt, Disturbance.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2013/04/urban-tree-root-management-concerns.html
Available @ https://earth-and-space-news.blogspot.com/2013/04/urban-tree-root-management-concerns.html
Marriner, Derdriu. 16 February 2013. “Tree Friendly Beneficial Soil Microbes: Inoculations and Occurrences.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2013/02/tree-friendly-beneficial-soil-microbes.html
Available @ https://earth-and-space-news.blogspot.com/2013/02/tree-friendly-beneficial-soil-microbes.html
Marriner, Derdriu. 15 December 2012. “Healthy Urban Tree Root Crown Balances: Soil Properties, Soil Volumes.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2012/12/healthy-urban-tree-root-crown-balances.html
Available @ https://earth-and-space-news.blogspot.com/2012/12/healthy-urban-tree-root-crown-balances.html
Marriner, Derdriu. 13 October 2012. “Tree Adaptive Growth: Tree Risk Assessment of Tree Failure, Tree Strength.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2012/10/tree-adaptive-growth-tree-risk.html
Available @ https://earth-and-space-news.blogspot.com/2012/10/tree-adaptive-growth-tree-risk.html
Marriner, Derdriu. 11 August 2012. “Tree Risk Assessment Mitigation Reports: Tree Removal, Tree Retention?” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2012/08/tree-risk-assessment-mitigation-reports.html
Available @ https://earth-and-space-news.blogspot.com/2012/08/tree-risk-assessment-mitigation-reports.html
Marriner, Derdriu. 16 June 2012. “Internally Stressed, Response Growing, Wind Loaded Tree Strength.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2012/06/internally-stressed-response-growing.html
Available @ https://earth-and-space-news.blogspot.com/2012/06/internally-stressed-response-growing.html
Marriner, Derdriu. 14 April 2012. “Three Tree Risk Assessment Levels: Limited Visual, Basic and Advanced.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2012/04/three-tree-risk-assessment-levels.html
Available @ https://earth-and-space-news.blogspot.com/2012/04/three-tree-risk-assessment-levels.html
Marriner, Derdriu. 19 February 2012. “Qualitative Tree Risk Assessment: Risk Ratings for Targets and Trees.” Earth and Space News. Sunday.
Available @ https://earth-and-space-news.blogspot.com/2012/02/qualitative-tree-risk-assessment-risk.html
Available @ https://earth-and-space-news.blogspot.com/2012/02/qualitative-tree-risk-assessment-risk.html
Marriner, Derdriu. 18 February 2012. “Qualitative Tree Risk Assessment: Falling Trees Impacting Targets.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2012/02/qualitative-tree-risk-assessment.html
Available @ https://earth-and-space-news.blogspot.com/2012/02/qualitative-tree-risk-assessment.html
Marriner, Derdriu. 10 December 2011. “Tree Risk Assessment: Tree Failures From Defects and From Wind Loads.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2011/12/tree-risk-assessment-tree-failures-from.html
Available @ https://earth-and-space-news.blogspot.com/2011/12/tree-risk-assessment-tree-failures-from.html
Marriner, Derdriu. 15 October 2011. “Five Tree Felling Plan Steps for Successful Removals and Worker Safety.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2011/10/five-tree-felling-plan-steps-for.html
Available @ https://earth-and-space-news.blogspot.com/2011/10/five-tree-felling-plan-steps-for.html
Marriner, Derdriu. 13 August 2011. “Natives and Non-Natives as Successfully Urbanized Plant Species.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2011/08/natives-and-non-natives-as-successfully.html
Available @ https://earth-and-space-news.blogspot.com/2011/08/natives-and-non-natives-as-successfully.html
Marriner, Derdriu. 11 June 2011. “Tree Ring Patterns for Ecosystem Ages, Dates, Health and Stress.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2011/06/tree-ring-patterns-for-ecosystem-ages.html
Available @ https://earth-and-space-news.blogspot.com/2011/06/tree-ring-patterns-for-ecosystem-ages.html
Marriner, Derdriu. 9 April 2011. “Benignly Ugly Tree Disorders: Oak Galls, Powdery Mildew, Sooty Mold, Tar Spot.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2011/04/benignly-ugly-tree-disorders-oak-galls.html
Available @ https://earth-and-space-news.blogspot.com/2011/04/benignly-ugly-tree-disorders-oak-galls.html
Marriner, Derdriu. 12 February 2011. “Tree Load Can Turn Tree Health Into Tree Failure or Tree Fatigue.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2011/02/tree-load-can-turn-tree-health-into.html
Available @ https://earth-and-space-news.blogspot.com/2011/02/tree-load-can-turn-tree-health-into.html
Marriner, Derdriu. 22 December 2010. “Tree Electrical Safety Knowledge, Precautions, Risks and Standards.” Earth and Space News. Saturday.
Available @ https://earth-and-space-news.blogspot.com/2010/12/tree-electrical-safety-knowledge.html
Available @ https://earth-and-space-news.blogspot.com/2010/12/tree-electrical-safety-knowledge.html
Moore, G.M. July 2021. “Root Tip Growth and the Presence of Leaves Affect Epicormic and Lignotuberous Shoot Development and Survival of Stressed Eucalyptus obliqua L'Herit. Seedlings." Arboriculture & Urban Forestry 47(4): 133-149.