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Exploring the geochemical distribution of organic carbon in early land plants: a novel approach

Lookup NU author(s): Dr Geoffrey Abbott, Dr Sabrina Tardio, Dr Ethan Hack

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Terrestrialization depended on the evolution of biosynthetic pathways for biopolymers including lignin, cutin and suberin, which were concentrated in specific tissues, layers or organs such as the xylem, cuticle and roots on the submillimetre scale. However, it is often difficult, or even impossible especially for individual cells, to resolve the biomolecular composition of the different components of fossil plants on such a scale using the well-established coupled techniques of gas chromatography/mass spectrometry and liquid chromatography/mass spectrometry. Here, we report the application of techniques for surface analysis to investigate the composition of Rhynia gwynne-vaughanii. X-ray photoelectron spectroscopy of two different spots (both 300 µm × 600 µm) confirmed the presence of carbon. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) revealed ‘chemical maps’ (imaging mode with 300 nm resolution) of aliphatic and aromatic carbon in the intact fossil that correlate with the vascular structures observed in high-resolution optical images. This study shows that imaging ToF-SIMS has value for determining the location of the molecular components of fossil embryophytes while retaining structural information that will help elucidate how terrestrialization shaped the early evolution of land plant cell wall biochemistry.This article is part of a discussion meeting issue ‘The Rhynie cherts: our earliest terrestrial ecosystem revisited’


Publication metadata

Author(s): Abbott GD, Fletcher IW, Tardio S, Hack E

Publication type: Article

Publication status: Published

Journal: Philosophical Transactions B: Biological Sciences

Year: 2017

Volume: 373

Issue: 1739

Print publication date: 05/02/2018

Online publication date: 18/12/2017

Acceptance date: 14/07/2017

Date deposited: 29/11/2017

ISSN (print): 0962-8436

ISSN (electronic): 1471-2970

Publisher: The Royal Society Publishing

URL: https://doi.org/10.1098/rstb.2016.0499

DOI: 10.1098/rstb.2016.0499

PubMed id: 29254964


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