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    Influence of Leaf Type and Plant Age on Leaf Structure and Sclerophylly in Hakea (Proteaceae)

    Access Status
    Fulltext not available
    Authors
    Groom, Philip
    Lamont, Byron
    Markey, A
    Date
    1997
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Groom, P.K., Lamont, B.B. and Markey, A.S. (1997) Influence of leaf type and plant age on leaf structure and sclerophylly in Hakea (Proteaceae). Australian Journal of Botany 45, 827-838.
    DOI
    10.1071/BT96115
    Faculty
    School of Agriculture and Environment
    Faculty of Science and Engineering
    Department of Environmental Biology
    Remarks

    This item may be available from Dr Philip Groom

    Email: p.groom@curtin.edu.au

    URI
    http://hdl.handle.net/20.500.11937/30111
    Collection
    • Curtin Research Publications
    Abstract

    Hakea Schrader (Proteaceae) species possess one of two contrasting leaf morphologies—broad or terete. Terete leaves are either simple (needle-like) or two- or three-pronged, and are further characterised by their greater thickness (> 1 mm), smaller projected area and mass, higher mass per unit area (a measure of sclerophylly) and lower density than broad leaves. Broad leaves are much more variable in their morphology, ranging from narrow-linear to fan-shaped or ovoid-elliptic, and may be flat, undulate, shell-shaped or spiralled. The greater thickness and sclerophylly of terete leaves can be partially attributed to the presence of a prominent, thick-walled parenchyma core and increased palisade thickness. The core contains a compact conduit of fibre-capped vascular bundles. The sclerophyllous nature of broad leaves is due to their high density, attributable to their thin palisade and large fibre caps surrounding the main vascular bundles. Both leaf types have a thick cuticle (> 20 μm) in mature plants, and sunken stomates, with terete leaves possessing a greater stomatal density than broad leaves. Both leaf types are isolateral and hence amphistomatous. Within a species, adult and seedling leaves having a similar leaf type differ morphologically rather than anatomically, with an overall increase in leaf thickness and higher levels of sclerophylly in adult leaves. Some species produce broad seedling leaves that are eventually replaced by terete adult leaves.

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    • Ecology and ecophysiology of southwestern Australian hakea species with contrasting leaf morphology and life forms.
      Groom, Philip K. (1996)
      Members of the genus Hakea (Proteaceae) are sclerophyllous, evergreen perennial shrubs or small trees endemic to Australia, with 65% of species confined to the South-West Botanical Province (southwestern Australia). ...
    • Contrasting Morphology and Ecophysiology of Co-occurring Broad and Terete Leaves in Hakea trifurcata (Proteaceae)
      Groom, Philip; Lamont, Byron; Kupsky, Lydia (1994)
      We studied the morphology, anatomy, phyllotaxy and daily seasonal ecophysiology of the two leaf types (broad and terete) of Hakea trifurcata (Smith) R.Br., a widespread shrub in south-western Australia. Both leaf types ...
    • Ecogeographical Analysis of Hakea (Proteaceae) in South-western Australia, with Special Reference to Leaf Morphology and Life Form.
      Groom, Philip; Lamont, Byron (1996)
      The genus Hakea Schrader (Proteaceae) has its world centre of diversity in south-western Australia; the majority (c. 70%) of species are endemic to this region. To examine the distribution of Hakea within south-western ...
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