Physiological responses to water stress in Eucalyptus cloeziana and E. argophloia seedlings

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

doi:10.1007/s00468-003-0316-5

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Physiological responses to water stress in Eucalyptus cloeziana and E. argophloia seedlings

Journal article

Peer reviewed

Physiological responses to water stress in Eucalyptus cloeziana and E. argophloia seedlings

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

Trees, Vol.18(4), pp.381-389

2004

DOI: https://doi.org/10.1007/s00468-003-0316-5

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Abstract

Forestry Sciences

gas exchange

acclimation

subhumid tropics

drought tolerance

stomatal density

Effects of water stress duration and intensity on gas exchange and leaf water potential were investigated in 7-month-old seedlings of a humid coastal provenance (Gympie) and a dry inland (Hungry Hills) provenance of E. cloeziana F. Muell. and in a dry inland (Chinchilla) provenance of E. argophloia Blakely supplied with 100% (T100), 70% (T70), 50% (T50) of their water requirements, or were watered only after they were wilted at dawn (T0). Seedlings of E. argophloia had the highest midday net photosynthetic rate (A), stomatal conductance (g s), stomatal density and predawn leaf water potential (pd) in all treatments. The E. cloeziana provenances did not differ in these attributes. The T70 and T50 treatments caused reductions in A of 30% in E. argophloia, and 55% in the E. cloeziana provenances. Under the T0 treatment, E. argophloia maintained higher rates of gas exchange at all levels of water stress than E. cloeziana provenances. The estimates of pd and midday water potential (md) at which plants remained wilted overnight were respectively: -2.7 and -4.1 MPa for E. cloeziana (humid), -2.8 and -4.0 MPa for E. cloeziana (dry) and, -3.7 and -4.9 MPa for E. argophloia. Following stress relief, both A and g s recovered more quickly in E. argophloia and in the dry provenance of E. cloeziana than in the humid provenance. We conclude that E. argophloia is more drought tolerant and has a potential for cultivation in the humid and semi humid climates, whilst E. cloeziana has greater potential in the humid subtropical climates.

Details

Title: Physiological responses to water stress in Eucalyptus cloeziana and E. argophloia seedlings
Authors: M Ngugi (Author) - University of Queensland
Mark A Hunt (Author) - Queensland Forestry Research Institute
D Doley (Author) - University of Queensland
P Ryan (Author) - Queensland Forestry Research Institute
P Dart (Author) - University of Queensland
Publication details: Trees, Vol.18(4), pp.381-389
Publisher: Springer
Date published: 2004
DOI: 10.1007/s00468-003-0316-5
ISSN: 0931-1890
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449794102621
Output Type: Journal article

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