Taxonomic basis for variation in the colonization strategy of arbuscular mycorrhizal fungi
Taxonomic basis for variation in the colonization strategy of arbuscular mycorrhizal fungi
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DOI：
10.1046/j.0028-646x.2001.00312.x
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发表时间：
2002-02-01
期刊：
影响因子：
9.4
通讯作者：
Reader, RJ
中科院分区：
文献类型：
--
作者：
Hart, MM;Reader, RJ
丛枝菌根真菌（AMF）是陆地群落的重要组成部分，但其个体的基本生态学及其定植策略尚不清楚。比较了3科（Acaulosporaceae， Gigasporaceae和Glomaceae） 21株AMF的定殖行为，探讨了AMF分类与定殖策略的关系。通过测定12周的根定殖率、根真菌生物量、土壤菌丝长度和土壤真菌生物量来考虑定殖率和定殖程度。大多数球囊科的分离株在Acaulosporaceae和Gigasporaceae分离株之前定殖根。最快的殖民者往往也是最广泛的。根系真菌生物量与土壤真菌生物量在分类上存在明显差异。球囊科（Glomaceae）的根定殖率较高，土壤定殖率较低，Gigasporaceae的根定殖率较高，而Acaulosporaceae的根定殖率和土壤定殖率较低。对于四种不同的寄主植物，这些结果是相似的。结果表明，AM真菌的定殖策略存在较大差异，这种差异是基于科水平的分类学差异。因此丛枝菌根真菌分类具有功能基础。
Arbuscular mycorrhizal fungi (AMF) are important components of terrestrial communities but the basic ecology of individual AMF, including their colonization strategy, remains unclear. The colonizing behaviours of 21 AMF isolates from three families (Acaulosporaceae, Gigasporaceae and Glomaceae) were compared to test for a relationship between AMF taxonomy and colonization strategy.Both the rate and extent of colonization were considered by measuring percentage root colonization, root fungal biomass, soil hyphal length and soil fungal biomass over 12 wk.Most Glomaceae isolates colonized roots before Acaulosporaceae and Gigasporaceae isolates. The fastest colonizers were also often the most extensive. Taxonomic differences were apparent in the amount and proportion of fungal biomass found in roots vs in soil. Glomaceae isolates had high root colonization but low soil colonization, Gigasporaceae isolates showed the opposite trend whereas Acaulosporaceae isolates had low root and soil colonization. These results were similar for four different host plants.The results indicate that the colonizing strategies of AM fungi differ considerably and that this variation is taxonomically based at the family level. Arbuscular mycorrhizal fungal taxonomy therefore has a functional basis.