Hayek Soukayna, Marchal Camille, Huc Stéphanie, Lapébie Ludivine, Abdulhak Sylvain, Van Es Jérémie, Barbreau Viviane, Mouhamadou Bello, Binet Marie-Noëlle
Faculty of Natural and Applied Sciences, Notre Dame University-Louaize, Zouk Mosbeh, P.O. Box 72, Zouk Mikael 5425, Lebanon.
Laboratoire d'Écologie Alpine, CNRS UMR 5553, Université Grenoble Alpes, CS 40700, CEDEX 09, 38058 Grenoble, France.
Microorganisms. 2023 Dec 30;12(1):75. doi: 10.3390/microorganisms12010075.
We examined the potential effects of weed species on the arbuscular mycorrhizal fungi (AMF) in an organic winter wheat () field in Lebanon. In this agroecosystem, the field and its surroundings were covered with spontaneous vegetation corresponding to local weeds. The coexistence between wheat and weeds did not modify AM fungal community diversity and colonization in but changed their composition. We evidenced 22 operational taxonomic units (OTUs) specifically shared between wheat associated with weeds (Td) and weeds, regardless of their localization and 12 OTUs with an abundance of variation between wheat without neighboring weeds (Td) and Td. The number of AM propagules and total C and N contents were higher in soil covered with wheat associated with weeds (TdW) vs. wheat without neighboring weeds (Td). In greenhouse experiments, the shoot biomass and root mycorrhizal intensity of used as a trap plant, were higher using TdW vs. Td as the inoculum. Positive correlations were observed between soil AM propagule numbers and shoot biomass, on the one hand and mycorrhizal intensity, on the other hand. Weeds seemed to exert significant effects on root AM fungal composition in and these effects may contribute to enhanced AMF development in the field.
我们在黎巴嫩的一个有机冬小麦田研究了杂草物种对丛枝菌根真菌（AMF）的潜在影响。在这个农业生态系统中，田地及其周边覆盖着与当地杂草相对应的自生植被。小麦和杂草的共存并未改变AM真菌群落的多样性和在小麦中的定殖情况，但改变了它们的组成。我们证实，无论其位置如何，与杂草相关的小麦（Td）和杂草之间共有22个可操作分类单元（OTU），并且在没有相邻杂草的小麦（Td）和Td之间有12个OTU存在丰度差异。与没有相邻杂草的小麦（Td）相比，与杂草相关的小麦覆盖的土壤（TdW）中AM繁殖体数量以及总碳和氮含量更高。在温室试验中，以TdW作为接种物时，用作诱捕植物的小麦的地上部生物量和根部菌根强度高于以Td作为接种物时。一方面，土壤AM繁殖体数量与小麦地上部生物量之间，另一方面，与小麦菌根强度之间均观察到正相关。杂草似乎对小麦根部的AM真菌组成产生显著影响，并且这些影响可能有助于田间AMF的发育增强。
