Bilaterally symmetric axes with rhizoids composed the rooting structure of the common ancestor of vascular plants.
Bilaterally symmetric axes with rhizoids composed the rooting structure of the common ancestor of vascular plants.
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DOI：
10.1098/rstb.2017.0042
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发表时间：
2018-02-05
期刊：
影响因子：
--
通讯作者：
Dolan L
中科院分区：
文献类型：
--
作者：
Hetherington AJ;Dolan L
在现存的陆地植物中有两种一般类型的根系统：配子体假根和孢子体根轴。这些结构在几乎所有陆生植物配子体和孢子体的自由生活阶段分别执行生根功能。现存的维管植物发展出一个占优势的、自由生活的孢子体，在其上形成根，除了少数分类群已经继发性地失去了根。然而，化石证据表明，早期的维管植物没有发展孢子体根。我们认为，维管植物的共同祖先发展了一个独特的生根系统-假根孢子体轴。本文对Rhynie燧石中的Horneophytonlignieri、Aglaophytonmajus、Rhyniagwynne-vaughanii和Nothiaaphylla的无根孢子体进行了综合和重新解释。我们发现，所有四种植物的孢子体生根结构包括区域的plagiotropic（水平）轴，开发单细胞假根在他们的底面。这些区域的轴与假根发展双边对称，使他们有别于其他地区的径向对称。我们假设，假根孢子体轴构成的生根结构在维管植物的共同祖先，因为这些植物的系统发育位置跨越维管谱系的起源。这篇文章是讨论会议的一部分问题“的Rhynie燧石：我们最早的陆地生态系统修订”。
There are two general types of rooting systems in extant land plants: gametophyte rhizoids and sporophyte root axes. These structures carry out the rooting function in the free-living stage of almost all land plant gametophytes and sporophytes, respectively. Extant vascular plants develop a dominant, free-living sporophyte on which roots form, with the exception of a small number of taxa that have secondarily lost roots. However, fossil evidence indicates that early vascular plants did not develop sporophyte roots. We propose that the common ancestor of vascular plants developed a unique rooting system—rhizoidal sporophyte axes. Here we present a synthesis and reinterpretation of the rootless sporophytes of Horneophyton lignieri, Aglaophyton majus, Rhynia gwynne-vaughanii and Nothia aphylla preserved in the Rhynie chert. We show that the sporophyte rooting structures of all four plants comprised regions of plagiotropic (horizontal) axes that developed unicellular rhizoids on their underside. These regions of axes with rhizoids developed bilateral symmetry making them distinct from the other regions which were radially symmetrical. We hypothesize that rhizoidal sporophyte axes constituted the rooting structures in the common ancestor of vascular plants because the phylogenetic positions of these plants span the origin of the vascular lineage. This article is part of a discussion meeting issue ‘The Rhynie cherts: our earliest terrestrial ecosystem revisited’.
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DOI：
10.1111/j.1095-8339.1986.tb01020.x
发表时间：
1986-09-01
影响因子：
2.4
作者：
EDWARDS, DS
通讯作者：
EDWARDS, DS
DOI：
10.1139/b05-102
发表时间：
2005-11-01
期刊：
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
影响因子：
--
作者：
Duckett, JG;Ligrone, R
通讯作者：
Ligrone, R
影响因子：
1.2
作者：
Gibling, M. R.;Davies, N. S.;Ielpi, A.
通讯作者：
Ielpi, A.
影响因子：
3
作者：
BIERHORST, DW
通讯作者：
BIERHORST, DW
DOI：
10.1098/rstb.1998.0192
发表时间：
1998-01-29
期刊：
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
影响因子：
--
作者：
Berner, RA
通讯作者：
Berner, RA