Molecular signatures of fossil leaves provide unexpected new evidence for extinct plant relationships
Molecular signatures of fossil leaves provide unexpected new evidence for extinct plant relationships
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化石叶子的分子特征为灭绝植物的关系提供了意想不到的新证据
DOI：
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发表时间：
2017
影响因子：
16.8
通讯作者：
P. Uvdal
中科院分区：
文献类型：
--
作者：
V. Vajda;M. Pucetaite;S. McLoughlin;A. Engdahl;J. Heimdal;P. Uvdal
基因序列构成了理解现存植物群之间关系的主要基础，但从化石中无法获得遗传数据来评估灭绝分类群的亲缘关系。在这里，我们表明，地热耐化石cuberies种子植物，傅里叶变换红外光谱（FTIR）和层次聚类分析（HCA）分析，保留生物分子套房，始终区分主要类群，即使经历了不同的成岩历史。我们的研究结果表明，主要植物群（现存和化石）的表皮生化特征之间的相似性大多与最近的分子和形态学数据的基础上的系统发育假说是一致的。我们的新的化学分类数据也支持这一假设，即灭绝的Nilssoniales和Bennettitales是密切相关的，但只有远亲苏铁目。Czekanowskia（Leptostrobales）角质层的化学特征与银杏叶非常相似，并支持这些群体之间的密切进化关系。最后，我们的研究结果还表明，灭绝的推定南洋杉，Allocladus，通过HCA分析时，分组更接近银杏目比针叶树。因此，在缺乏现代亲缘植物的分子信息的情况下，FTIR光谱提供了有价值的替代生物化学数据，补充了形态特征，以区分化石分类群，并帮助阐明灭绝植物的关系。一种新的古植物学方法分析了化石叶类的分子特征，以揭示迄今为止模糊的系统发育关系，例如Nilssoniales和Bennettitales之间; Ginkgoales和Leptostrobales之间。
Gene sequences form the primary basis for understanding the relationships among extant plant groups, but genetic data are unavailable from fossils to evaluate the affinities of extinct taxa. Here we show that geothermally resistant fossil cuticles of seed-bearing plants, analysed with Fourier transform infrared (FTIR) spectroscopy and hierarchical cluster analysis (HCA), retain biomolecular suites that consistently distinguish major taxa even after experiencing different diagenetic histories. Our results reveal that similarities between the cuticular biochemical signatures of major plant groups (extant and fossil) are mostly consistent with recent phylogenetic hypotheses based on molecular and morphological data. Our novel chemotaxonomic data also support the hypothesis that the extinct Nilssoniales and Bennettitales are closely allied, but only distantly related to Cycadales. The chemical signature of the cuticle of Czekanowskia (Leptostrobales) is strongly similar to that of Ginkgo leaves and supports a close evolutionary relationship between these groups. Finally, our results also reveal that the extinct putative araucariacean, Allocladus, when analysed through HCA, is grouped closer to Ginkgoales than to conifers. Thus, in the absence of modern relatives yielding molecular information, FTIR spectroscopy provides valuable proxy biochemical data complementing morphological characters to distinguish fossil taxa and to help elucidate extinct plant relationships.A new palaeobotanical method analyses molecular signatures of fossil leaf cuticles to reveal hitherto obscure phylogenetic relationships, for example between Nilssoniales and Bennettitales; Ginkgoales and Leptostrobales.
DOI：
10.1073/pnas.97.8.4086
发表时间：
2000-04-11
影响因子：
11.1
作者：
Chaw, SM;Parkinson, CL;Palmer, JD
通讯作者：
Palmer, JD