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    Canopy development and hydraulic function in Eucalyptus tereticornis grown in drought in CO2-enriched atmospheres.

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    Author
    Atwell, BJ; Henery, ML; Rogers, GS; Seneweera, SP; Treadwell, M; Conroy, JP
    Date
    2008-01
    Source Title
    Functional Plant Biology: an international journal of plant function
    Publisher
    CSIRO Publishing
    University of Melbourne Author/s
    Seneweera, Saman
    Affiliation
    Agriculture And Food Systems
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Atwell, B. J., Henery, M. L., Rogers, G. S., Seneweera, S. P., Treadwell, M. & Conroy, J. P. (2008). Canopy development and hydraulic function in Eucalyptus tereticornis grown in drought in CO2-enriched atmospheres.. Funct Plant Biol, 34 (12), pp.1137-1149. https://doi.org/10.1071/FP06338.
    Access Status
    This item is currently not available from this repository
    URI
    http://hdl.handle.net/11343/28774
    DOI
    10.1071/FP06338
    Description

    C1 - Journal Articles Refereed

    Abstract
    We report on the relationship between growth, partitioning of shoot biomass and hydraulic development of Eucalyptus tereticornis Sm. grown in glasshouses for six months. Close coordination of stem vascular capacity and shoot architecture is vital for survival of eucalypts, especially as developing trees are increasingly subjected to spasmodic droughts and rising atmospheric CO2 levels. Trees were exposed to constant soil moisture deficits in 45 L pots (30-50% below field capacity), while atmospheric CO2 was raised to 700 μL CO2 L-1 in matched glasshouses using a hierarchical, multi-factorial design. Enrichment with CO2 stimulated shoot growth rates for 12-15 weeks in well-watered trees but after six months of CO2 enrichment, shoot biomasses were not significantly heavier (30% stimulation) in ambient conditions. By contrast, constant drought arrested shoot growth after 20 weeks under ambient conditions, whereas elevated CO2 sustained growth in drought and ultimately doubled the shoot biomass relative to ambient conditions. These growth responses were achieved through an enhancement of lateral branching up to 8-fold due to CO2 enrichment. In spite of larger transpiring canopies, CO2 enrichment also improved the daytime water status of leaves of droughted trees. Stem xylem development was highly regulated, with vessels per unit area and cross sectional area of xylem vessels in stems correlated inversely across all treatments. Furthermore, vessel numbers related to the numbers of leaves on lateral branches, broadly supporting predictions arising from Pipe Model Theory that the area of conducting tissue should correlate with leaf area. Diminished water use of trees in drought coincided with a population of narrower xylem vessels, constraining hydraulic capacity of stems. Commensurate with the positive effects of elevated CO2 on growth, development and leaf water relations of droughted trees, the capacity for long-distance water transport also increased.
    Keywords
    Plant Biology not elsewhere classified; Management of Gaseous Waste from Plant Production (excl. Greenhouse Gases)

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