Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Pleurorhizoxylon yixingense gen. et sp. nov., a Euphyllophyte Axis with Anatomically Preserved Adventitious Roots from the Late Devonian of South China

Zhang, Yingying, Berry, Christopher M., Wang, Deming, Xue, Jinzhuang and Liu, Le 2018. Pleurorhizoxylon yixingense gen. et sp. nov., a Euphyllophyte Axis with Anatomically Preserved Adventitious Roots from the Late Devonian of South China. International Journal of Plant Sciences 179 (7) , pp. 523-540. 10.1086/698710

[img]
Preview
PDF - Accepted Post-Print Version
Download (1MB) | Preview

Abstract

Premise of research. Rooting structures were major contributors to Devonian global change, but anatomically preserved plant roots are rare from this period. We report a new type of plant axis from the Upper Devonian strata of South China that contains a protostele, relatively extensive secondary xylem, and adventitious root traces. Methodology. The original specimens were fragmentary coalified axes, most of which were embedded in Epon resin, sectioned transversely and longitudinally, and ground into thin sections. The sections were observed and imaged with a light microscope. A few were observed directly with a scanning electron microscope. Pivotal results. The axis of this new plant, named Pleurorhizoxylon gen. nov., consists of a three-ribbed protostele and thick secondary xylem; the primary xylem is of apparent mesarch maturation, with a single protoxylem lacuna near the end of each rib. The secondary xylem has variable rays composed of parenchyma cells and has scalariform to elliptical bordered pits on both radial and tangential walls of the tracheids. The adventitious root traces are located opposite each primary xylem rib going through the wood; they are accompanied by large rays and cause significant accommodation (knotting) in the wood. Extraxylary portions are poorly preserved, and no cambium or secondary phloem has been found. Conclusions. The new plant has a unique combination of characters and demonstrates the anatomical basis for adventitious root growth present in a Devonian moniliform plant, other than cladoxylopsids, for the first time.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: University of Chicago Press
ISSN: 1058-5893
Date of First Compliant Deposit: 6 July 2018
Date of Acceptance: 24 April 2018
Last Modified: 20 Oct 2019 06:03
URI: http://orca.cf.ac.uk/id/eprint/113013

Citation Data

Cited 1 time in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics