Evolutionary dynamics of mycorrhizal symbiosis in land plant diversification.

Evolutionary dynamics of mycorrhizal symbiosis in land plant diversification.
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DOI:
10.1038/s41598-018-28920-x
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发表时间:
2018-07-16
期刊:
影响因子:
4.6
通讯作者:
Merckx VSFT
Merckx VSFT
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Feijen FAA;Vos RA;Nuytinck J;Merckx VSFT

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土壤真菌与陆生植物之间的菌根共生是地球上最广泛和最重要的生态互惠关系之一。长期以来,人们一直认为,在奥陶纪,大多数植物的菌根共生体Glomeromycotina促进了植物在陆地上的定殖。这一观点最近受到挑战的发现菌根样协会与毛霉亚门在几个早期分歧谱系的陆地植物。利用一个大型的,物种水平的数据库的植物的菌根样协会和贝叶斯方法的状态转换动力学,我们在这里表明,招聘毛霉亚门是最好的支持过渡从非菌根状态。我们进一步发现,毛霉亚门和球囊菌亚门之一或两者的不同组合之间的转换发生在高速率,并发现类似的混杂组合,包括球囊菌亚门和子囊菌亚门之一或两者与担子菌门几乎固定的关联。我们的研究结果描绘了一个进化的情况下,菌根共生的进化与毛霉亚门在陆地植物多样化的早期阶段的突出作用。
Mycorrhizal symbiosis between soil fungi and land plants is one of the most widespread and ecologically important mutualisms on earth. It has long been hypothesized that the Glomeromycotina, the mycorrhizal symbionts of the majority of plants, facilitated colonization of land by plants in the Ordovician. This view was recently challenged by the discovery of mycorrhiza-like associations with Mucoromycotina in several early diverging lineages of land plants. Utilizing a large, species-level database of plants’ mycorrhiza-like associations and a Bayesian approach to state transition dynamics we here show that the recruitment of Mucoromycotina is the best supported transition from a non-mycorrhizal state. We further found that transitions between different combinations of either or both of Mucoromycotina and Glomeromycotina occur at high rates, and found similar promiscuity among combinations that include either or both of Glomeromycotina and Ascomycota with a nearly fixed association with Basidiomycota. Our results portray an evolutionary scenario of evolution of mycorrhizal symbiosis with a prominent role for Mucoromycotina in the early stages of land plant diversification.
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