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Leaf water relations of Eucalyptus cloeziana and Eucalyptus argophloia in response to water deficit
journal contribution
posted on 2023-05-18, 12:44 authored by Ngugi, MR, Doley, D, Mark HuntMark Hunt, Dart, P, Ryan, PLeaf 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.
History
Publication title
Tree PhysiologyVolume
23Issue
5Pagination
335-343ISSN
0829-318XDepartment/School
School of Natural SciencesPublisher
Heron PublishingPlace of publication
202, 3994 Shelbourne St, Victoria, Canada, Bc, V8N 3E2Rights statement
Copyright 2003 Heron PublishingRepository Status
- Open