Mutualistic mycorrhiza-like symbiosis in the most ancient group of land plants
Mutualistic mycorrhiza-like symbiosis in the most ancient group of land plants
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DOI：
10.1038/ncomms1105
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发表时间：
2010-11-01
影响因子：
16.6
通讯作者：
Beerling, David J.
中科院分区：
文献类型：
--
作者：
Humphreys, Claire P.;Franks, Peter J.;Beerling, David J.
35年前，人们假设互利共生的土壤真菌有助于陆地植物最初在陆地环境中定居。这一重要的想法已经越来越多地建立与古植物学和分子研究，确定丛枝菌根真菌（AMF）和陆地植物之间的相互作用至少400 M Ma，但类似的伙伴关系在“低”陆地植物的功能仍然未知。在这项研究中，我们表明与多因子实验，殖民化的一个复杂的叶状地钱，最古老的现存分支的陆地植物的成员，AMF显着促进光合碳的吸收，生长和无性繁殖。通过真菌增强从土壤中获取磷和氮，植物适合度增加，每株植物支持100-400 m的AMF菌丝体。模拟的富CO2的大气，类似于古生代的陆地植物起源时，显着放大AMF的净效益和可能的选择压力建立的共生。我们的分析提供了重要的缺失功能的证据，支持AMF共生体作为驱动程序的植物陆生化在早古生代的土地生态系统。
Over 35 years ago, it was hypothesized that mutualistic symbiotic soil fungi assisted land plants in their initial colonization of terrestrial environments. This important idea has become increasingly established with palaeobotanical and molecular investigations dating the interactions between arbuscular mycorrhizal fungi (AMF) and land plants to at least 400 M Ma, but the functioning of analogous partnerships in 'lower' land plants remains unknown. In this study, we show with multifactorial experiments that colonization of a complex thalloid liverwort, a member of the most ancient extant clade of land plants, with AMF significantly promotes photosynthetic carbon uptake, growth and asexual reproduction. Plant fitness increased through fungal-enhanced acquisition of phosphorus and nitrogen from soil, with each plant supporting 100-400 m of AMF mycelia. A simulated CO2-rich atmosphere, similar to that of the Palaeozoic when land plants originated, significantly amplified the net benefits of AMF and likely selection pressures for establishment of the symbiosis. Our analyses provide essential missing functional evidence supporting AMF symbionts as drivers of plant terrestrialization in early Palaeozoic land ecosystems.