Höppener-Ogawa Sachie, Leveau Johan H J, Hundscheid Maria P J, van Veen Johannes A, de Boer Wietse
Centre for Terrestrial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Heteren, The Netherlands.
Environ Microbiol. 2009 Jun;11(6):1444-52. doi: 10.1111/j.1462-2920.2009.01872.x. Epub 2009 Mar 2.
The genus Collimonas consists of soil bacteria that have the potential to grow at the expense of living fungal hyphae. However, the consequences of this mycophagous ability for soil fungi are unknown. Here we report on the development of fungal communities after introduction of collimonads in a soil that had a low abundance of indigenous collimonads. Development of fungal communities was stimulated by addition of cellulose or by introducing plants (Plantago lanceolata). Community composition of total fungi in soil and rhizosphere and of arbuscular mycorrhizal fungi in roots was examined by PCR-DGGE. The introduction of collimonads altered the composition of all fungal communities studied but had no effects on fungal biomass increase, cellulose degrading activity or plant performance. The most likely explanation for these results is that differences in sensitivity of fungal species to the presence of collimonads result in competitive replacement of species. The lab and greenhouse experiments were complemented with a field experiment. Mesh bags containing sterile sand with or without collimonads were buried in an ex-arable field and a forest. The presence of collimonads had an effect on the composition of fungi invading these bags in the ex-arable site but not in the forest site.
Collimonas属由一些土壤细菌组成，这些细菌有可能以活的真菌菌丝为代价进行生长。然而，这种噬菌能力对土壤真菌的影响尚不清楚。在此，我们报告了在一种本地Collimonas菌丰度较低的土壤中引入Collimonas菌后真菌群落的发展情况。添加纤维素或引入植物（披针叶车前）刺激了真菌群落的发展。通过PCR-DGGE检测了土壤和根际中总真菌以及根中丛枝菌根真菌的群落组成。引入Collimonas菌改变了所研究的所有真菌群落的组成，但对真菌生物量增加、纤维素降解活性或植物生长表现没有影响。对这些结果最可能的解释是，真菌物种对Collimonas菌存在的敏感性差异导致了物种间的竞争性替代。实验室和温室实验得到了田间实验的补充。装有含或不含Collimonas菌的无菌沙子的网袋被埋在一块废弃农田和一片森林中。Collimonas菌的存在对侵入废弃农田中这些网袋的真菌组成有影响，但对森林中的真菌组成没有影响。
