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Abstract Detail


Developmental and Structural Section

Gardner, Stuart K. [1].

A Unique Structure: leaf ontogeny and morphology in Acacia.

The recently redefined genus Acacia consists of more than 1000 species, nearly all of which are endemic to Australia. Acacia foliage is highly variable and all species exhibit heteroblastic leaf development to some extent as seedlings, with a typical progression from pinnate to bipinnate leaves in the first few seedling nodes followed in most species by the transition to phyllodes. The phyllode is unique in the plant kingdom and its structure, development and the genetic processes involved in its formation are little understood. Despite its significance for classification, the homology of this character remains uncertain. Modern microscopy and molecular genetic techniques resolving details of the morphology and development suggest a different way of interpreting the foliage changes exhibited by Acacia species. Conceptualization of Acacia leaf development using aspects of continuum morphology suggests elegant molecular controls of this apparently complex change.


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1 - The University of Melbourne, School of Botany, Reception, Parkville, Victoria, 3010, Australia

Keywords:
Acacia
phyllode
Leaf development
compound leaf
leaf morphology
ontogeny.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P48009
Abstract ID:1016


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