Chemical Evidence for Cell Wall Lignification and the Evolution of Tracheids in Early Devonian Plants

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Chemical Evidence for Cell Wall Lignification and the Evolution of Tracheids in Early Devonian Plants

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Title: Chemical Evidence for Cell Wall Lignification and the Evolution of Tracheids in Early Devonian Plants
Author: Hazen, Robert M.; Boyce, C. Kevin; Alexander, Conel M. O'D.; Cody, George D.; Fogel, Marilyn L.; Knoll, Andrew

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Citation: Boyce, C. Kevin, George D. Cody, Marilyn L. Fogel, Robert M. Hazen, Conel M. O. Alexander, and Andrew H. Knoll. 2003. Chemical evidence for cell wall lignification and the evolution of tracheids in early Devonian plants. International Journal of Plant Sciences 164(5): 691-702.
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Abstract: Anatomically preserved land plant fossils from the Lower Devonian Rhynie Chert contain conducting tissues with cells that range from dark-colored, elongated cells without secondary wall thickenings to tracheids similar to those of extant tracheophytes. A suite of tissue-specific microanalytical techniques was used to assess lignification in fossils of Aglaophyton, Rhynia, and Asteroxylon. Isotope ratio mass spectrometry provides millimeter-scale resolution of carbon isotopic abundances, whereas soft X-ray carbon (1s) spectromicroscopy provides micrometer-scale resolution of the preservation of organic molecular functionality. The isotopic and organic chemistry of Rhynie Chert plants indicates that the earliest vascular thickenings were probably unlignified and that cell wall lignification may have first appeared in the outer cortex. Only in more derived plants, it seems, was lignin deposited in conducting cells to produce the true tracheids seen today in vascular plants.
Published Version: http://dx.doi.org/10.1086/377113
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3196097

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  • FAS Scholarly Articles [7495]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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