Leaf water relations of Eucalyptus cloeziana and Eucalyptus argophloia in response to water deficit

M Ngugi; D Doley; Mark A Hunt; P Dart; P Ryan

doi:10.1093/treephys/23.5.335

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Leaf water relations of Eucalyptus cloeziana and Eucalyptus argophloia in response to water deficit

Journal article

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Leaf water relations of Eucalyptus cloeziana and Eucalyptus argophloia in response to water deficit

M Ngugi, D Doley, Mark A Hunt, P Dart and P Ryan

Tree Physiology, Vol.23(5), pp.335-343

2003

DOI: https://doi.org/10.1093/treephys/23.5.335

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Abstract

Forestry Sciences

apoplastic water

bulk modulus of elasticity

drought tolerance

leaf anatomy

osmotic adjustment

pressure-volume curves

subtropics

Leaf water relations responses to limited water supply were determined in 7-month-old plants of a dry inland provenance of Eucalyptus argophloia Blakely and in a humid coastal provenance (Gympie) and a dry inland provenance (Hungry Hills) of Eucalyptus cloeziana F. Muell. Each provenance of E. cloeziana exhibited a lower relative water content at the turgor loss point, a lower apoplastic water content, a smaller ratio of dry mass to turgid mass and a lower bulk modulus of elasticity than the single provenance of E. argophloia. Osmotic potential at full turgor and water potential at the turgor loss point were significantly lower in E. argophloia and the inland provenance of E. cloeziana than in the coastal provenance of E. cloeziana. There was limited osmotic adjustment in response to soil drying in E. cloeziana, but not in E. argophloia. Between-species differences in water relations parameters were larger than those between the E. cloeziana provenances. Both E. cloeziana provenances maintained turgor under moderate water stress through a combination of osmotic and elastic adjustments. Eucalyptus argophloia had more rigid cell walls and reached lower water potentials with less reduction in relative water content than either of the E. cloeziana provenances, thereby enabling it to extract water from dryer soils.

Details

Title: Leaf water relations of Eucalyptus cloeziana and Eucalyptus argophloia in response to water deficit
Authors: M Ngugi (Author) - University of Queensland
D Doley (Author) - University of Queensland
Mark A Hunt (Author) - Queensland Forestry Research Institute
P Dart (Author) - University of Queensland
P Ryan (Author) - Queensland Forestry Research Institute
Publication details: Tree Physiology, Vol.23(5), pp.335-343
Publisher: Oxford University Press
Date published: 2003
DOI: 10.1093/treephys/23.5.335
ISSN: 0829-318X
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449862202621
Output Type: Journal article

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