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Relating Stomatal Conductance to Leaf Functional Traits

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Genotypic differences in water use efficiency and (13)C discrimination in Eucalyptus globulus.

J. Osório¹, J. S. Pereira

¹Department of Forestry, Instituto Superior de Agronomia, Tapada da Ajuda, 1399 Lisboa codex, Portugal.

Tree Physiology

|July 1, 1994

Summary

This summary is machine-generated.

Water deficit significantly increased water use efficiency (WUE) in Eucalyptus globulus clones, correlating positively with carbon isotope ratios (delta(13)C). The fastest-growing clone was most impacted by water stress.

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Area of Science:

Plant Physiology
Forest Ecology
Environmental Science

Background:

Eucalyptus globulus is a vital commercial tree species.
Understanding clone-specific responses to water stress is crucial for sustainable forestry.
Water use efficiency (WUE) is a key trait for plant survival and productivity in arid environments.

Purpose of the Study:

To investigate the physiological and growth responses of three Eucalyptus globulus clones to water deficit.
To determine the impact of water stress on water use efficiency and carbon isotope discrimination.
To assess clone-specific variations in drought tolerance.

Main Methods:

Cuttings of three Eucalyptus globulus clones (SM, VC, DG) were subjected to high water (HW) and low water (LW) treatments for 56 days.
Measurements included transpirational water loss, biomass production, leaf gas exchange, and water potential.
Leaf tissue was analyzed for carbon isotope ratios (delta(13)C).

Main Results:

Clones exhibited significant differences in growth capacity (SM > DG > VC) and response to water stress.
Water deficit significantly reduced total biomass and leaf area, with the fastest-growing clone (SM) being most affected.
Long-term WUE increased under water deficit and was positively correlated with delta(13)C.
delta(13)C was negatively correlated with specific leaf area (SLA) and positively related to carbon content per unit leaf area.

Conclusions:

Water deficit enhances WUE in Eucalyptus globulus, with variations among clones.
Carbon isotope discrimination (delta(13)C) serves as a reliable indicator of long-term WUE under water stress.
Clone SM, despite its high growth potential, is more vulnerable to water deficits, highlighting the need for clone selection based on environmental conditions.