Dabire A P, Hien V, Kisa M, Bilgo A, Sangare K S, Plenchette C, Galiana A, Prin Y, Duponnois R
INERA, Laboratoire SEP (Sol-Plante-Eau), 01 BP 476, Ouagadougou, Burkina Faso.
IRD, UMR 113 CIRAD/INRA/IRD/AGRO-M/UM2, Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM), TA10/J, Campus International de Baillarguet, 34398, Montpellier Cedex 5, France.
Mycorrhiza. 2007 Sep;17(6):537-545. doi: 10.1007/s00572-007-0126-5. Epub 2007 Apr 25.
Although it is usually admitted that arbuscular mycorrhizal (AM) fungi are key components in soil bio-functioning, little is known on the response of microbial functional diversity to AM inoculation. The aims of the present study were to determine the influence of Glomus intraradices inoculum densities on plant growth and soil microflora functional diversity in autoclaved soil or non-disinfected soil. Microbial diversity of soil treatments was assessed by measuring the patterns of in situ catabolic potential of microbial communities. The soil disinfection increased sorghum growth, but lowered catabolic evenness (4.8) compared to that recorded in the non-disinfected soil (6.5). G. intraradices inoculation induced a higher plant growth in the autoclaved soil than in the non-disinfected soil. This AM effect was positively related to inoculum density. Catabolic evenness and richness were positively correlated with the number of inoculated AM propagules in the autoclaved soil, but negatively correlated in the non-disinfected soil. In addition, after soil disinfection and AM inoculation, these microbial functionality indicators had higher values than in the autoclaved or in the non-disinfected soil without AM inoculation. These results are discussed in relation to the ecological influence of AM inoculation, with selected fungal strains and their associated microflora on native soil microbial activity.
尽管通常认为丛枝菌根（AM）真菌是土壤生物功能的关键组成部分，但对于微生物功能多样性对AM接种的响应却知之甚少。本研究的目的是确定根内球囊霉接种密度对灭菌土壤或未消毒土壤中植物生长和土壤微生物区系功能多样性的影响。通过测量微生物群落原位分解代谢潜力的模式来评估土壤处理的微生物多样性。土壤消毒促进了高粱生长，但与未消毒土壤（6.5）相比，分解代谢均匀度降低（4.8）。在灭菌土壤中，接种根内球囊霉比在未消毒土壤中能促进更高的植物生长。这种AM效应与接种密度呈正相关。在灭菌土壤中，分解代谢均匀度和丰富度与接种的AM繁殖体数量呈正相关，但在未消毒土壤中呈负相关。此外，经过土壤消毒和AM接种后，这些微生物功能指标的值高于未接种AM的灭菌土壤或未消毒土壤。结合接种选定的真菌菌株及其相关微生物区系对原生土壤微生物活性的生态影响，对这些结果进行了讨论。
