Reinvestigation of the occurence of cutan in plants: implications for the leaf fossil record

NS Gupta, ME Collinson, DEG Briggs, RP Evershed, RD Pancost

Research output: Contribution to journalArticle (Academic Journal)

44 Citations (Scopus)

Abstract

Cutan, a resistant non-hydrolyzable aliphatic biopolymer, was first reported in the cuticle of Agave americana and has generally been considered ubiquitous in leaf cuticles along with the structural biopolyester cutin. Because leaves and cuticles in the fossil record almost always have an aliphatic composition, it was argued that selective preservation of cutan played an important role in leaf preservation. However, the analysis of leaves using chemical degradation techniques involving hydrolysis to test for the presence of cutan reveals that it is absent in 16 of 19 taxa (angiosperm and gymnosperm), including many previously reported to contain cutan on the basis of pyrolysis data. Cutan is clearly much less widespread in leaves than previously thought, and its presence or absence does not exert any major bias on the preservation of leaves in the fossil record. In the absence of cutan, other constituents - cutin, plant waxes, and internal plant lipids - are incorporated into the geomacromolecule and contribute to the formation of a resistant aliphatic polymer by in situ polymerization during diagenesis.
Translated title of the contributionReinvestigation of the occurence of cutan in plants: implications for the leaf fossil record
Original languageEnglish
Pages (from-to)432 - 449
Number of pages18
JournalPaleobiology
Volume32 (3)
DOIs
Publication statusPublished - Sep 2006

Bibliographical note

Publisher: Paleontological Society

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