Estimating the Phanerozoic history of the Ascomycota lineages: Combining fossil and molecular data
Estimating the Phanerozoic history of the Ascomycota lineages: Combining fossil and molecular data
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DOI：
10.1016/j.ympev.2014.04.024
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发表时间：
2014-09-01
影响因子：
4.1
通讯作者：
Schmidt, Alexander R.
中科院分区：
文献类型：
--
作者：
Beimforde, Christina;Feldberg, Kathrin;Schmidt, Alexander R.
子囊菌门是迄今为止真菌界中最大的类群。生态上重要的互利共生关系，如菌根和地衣，在这个群体中进化出来，被认为是支持陆地植物进化的关键创新。使用分子钟方法来确定子囊菌谱系起源的尝试很少，这主要是由于缺乏令人满意的化石校准数据。因此，我们评估了来自琥珀（阿尔布阶到中新世）和燧石（泥盆纪和马斯特里赫特阶）的所有最古老的子囊菌化石。这些化石代表了五个主要的子囊菌纲（Coniocybomycetes、Dothideomycetes、Eurotiomycetes、Laboulbeniomycetes 和 Lecanoromycetes）。我们从代表子囊菌门大多数类群的总共 145 个类群中组装了一个多基因数据集（18SrDNA、28SrDNA、RPB1 和 RPB2），并利用仅来自子囊菌内部的化石校准点，通过贝叶斯方法估计子囊菌谱系的分歧时间。我们的研究结果表明盘菌亚门在奥陶纪出现了最初的多样化，随后在整个显生宙出现了谱系的反复分裂，并表明这种持续的多样化并未受到大规模灭绝的影响。我们认为，每个谱系内的生态多样性确保了每个类群中至少有一些类群能够在全球危机中幸存下来并迅速恢复。 (C) 2014 年作者。由爱思唯尔公司出版
The phylum Ascomycota is by far the largest group in the fungal kingdom. Ecologically important mutualistic associations such as mycorrhizae and lichens have evolved in this group, which are regarded as key innovations that supported the evolution of land plants. Only a few attempts have been made to date the origin of Ascomycota lineages by using molecular clock methods, which is primarily due to the lack of satisfactory fossil calibration data. For this reason we have evaluated all of the oldest available ascomycete fossils from amber (Albian to Miocene) and chert (Devonian and Maastrichtian). The fossils represent five major ascomycete classes (Coniocybomycetes, Dothideomycetes, Eurotiomycetes, Laboulbeniomycetes, and Lecanoromycetes). We have assembled a multi-gene data set (18SrDNA, 28SrDNA, RPB1 and RPB2) from a total of 145 taxa representing most groups of the Ascomycota and utilized fossil calibration points solely from within the ascomycetes to estimate divergence times of Ascomycota lineages with a Bayesian approach. Our results suggest an initial diversification of the Pezizomycotina in the Ordovician, followed by repeated splits of lineages throughout the Phanerozoic, and indicate that this continuous diversification was unaffected by mass extinctions. We suggest that the ecological diversity within each lineage ensured that at least some taxa of each group were able to survive global crises and rapidly recovered. (C) 2014 The Authors. Published by Elsevier Inc.