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Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?


Quentin, A and Pinkard, E and Beadle, CL and Wardlaw, TJ and O'Grady, AP and Paterson, SC and Mohammed, CL, Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?, Annals of Forest Science, 67, (2) pp. 203p1-203p9. ISSN 1286-4560 (2010) [Refereed Article]


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Copyright © EDP Sciences, 2010

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DOI: doi:10.1051/forest/2009096


Artificial defoliation is often used to simulate defoliation by herbivory and is usually considered a good indication of a plant’s response to a given type of damage. However, the findings of studies directly comparing the two defoliation types are inconsistent. • Here, the short term effects of artificial and insect defoliation by larvae of Paropsisterna agricola on growth, biomass allocation and photosynthetic capacity of Eucalyptus globulus seedlings were compared in a glasshouse experiment. The artificial defoliation was carried out to closely resemble the spatial patterns observed for insect defoliation. • Height and diameter increments were reduced as a result of insect defoliation, whereas artificial defoliation had no significant effect on height. Increased photosynthetic capacity was observed in response to both treatments, but the magnitude of this increase was larger in insect- than in artificially-defoliated seedlings. Significant reductions in foliar carbohydrate content and total biomass were noticeable in artificially-defoliated seedlings. Although the foliar carbohydrate levels also decreased across the crown zones following insect defoliation treatment, seedlings allocated a large amount of their biomass in the branches of the damaged zone. • Despite our best endeavours to simulate insect defoliation in the artificial treatment, the latter may not reflect accurately the full strength of the effects. However, artificial and insect defoliation were similar in their direction of the responses they caused in E. globulus seedlings.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Tree nutrition and physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Forestry not elsewhere classified
UTAS Author:Quentin, A (Dr Audrey Quentin)
UTAS Author:Pinkard, E (Dr Elizabeth Pinkard)
UTAS Author:Beadle, CL (Dr Christopher Beadle)
UTAS Author:O'Grady, AP (Dr Anthony O'Grady)
UTAS Author:Paterson, SC (Mr Stephen Paterson)
UTAS Author:Mohammed, CL (Professor Caroline Mohammed)
ID Code:67039
Year Published:2010
Web of Science® Times Cited:43
Deposited By:Agricultural Science
Deposited On:2011-02-23
Last Modified:2011-05-25
Downloads:563 View Download Statistics

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