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Leaf cuticular morphology links platanaceae and proteaceae

journal contribution
posted on 2023-05-16, 17:25 authored by Carpenter, RJ, Hill, RS, Gregory JordanGregory Jordan
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.

History

Publication title

International Journal of Plant Sciences

Volume

166

Issue

5

Pagination

843-855

ISSN

1058-5893

Department/School

School of Natural Sciences

Publisher

University of Chicago Press, Journals Division

Place of publication

United States

Rights statement

Copyright 2005 The University of Chicago

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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