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Leaf cuticular morphology links Platanaceae and Proteaceae
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The leaf cuticular morphology of extant species of Platanus was investigated using light and scanning electron microscopy. All species are shown to possess trichome bases of the same type as those commonly found in Proteaceae. Of particular significance are compound forms that consist of an annular surface scar associated with more than one underlying epidermal cell. These are found on the adaxial leaf surfaces of all species of Platanus and are also clearly evident on the abaxial surface of Platanus orientalis. This type of trichome base is therefore interpreted as the first detected nonreproductive morphological synapomorphy linking Proteaceae and Platanaceae. Also, the laterocytic, sometimes paracytic, or anomocytic arrangement of subsidiary cells in Platanus is distinct from the general state in Proteaceae, which is brachyparacytic and presumably derived. In Bellendena, possibly the most basal genus of extant Proteaceae, subsidiary cell arrangements resemble those of Platanus. These results are discussed with respect to leaf fossil records of Proteales, where it is concluded that the combination of brachyparacytic stomata and compound trichome
bases is strong evidence for Proteaceae.
|Keywords:||Platanus, Platanacaeae, Proteaceae, Bellendena, leaves, cuticles, trichomes, stomata, fossils, phylogeny|
|Journal or Publication Title:||International Journal of Plant Sciences|
|Page Range:||pp. 843-855|
|Identification Number - DOI:||10.1086/431806|
Copyright 2005 University of Chicago Press.
|Date Deposited:||30 Aug 2007|
|Last Modified:||18 Nov 2014 03:21|
|Item Statistics:||View statistics for this item|
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