Title: A foliar Epichlo? endophyte and soil moisture modified belowground arbuscular mycorrhizal fungal biodiversity associated with Achnatherum inebrians
Authors: Zhong Rui, Xia Chao, Ju Yawen, Zhang Xingxu*, Duan Tingyu, Nan Zhibiao*, Li Chunjie
Journal; Plant and Soil (农林科学一区, IF2018=3.259)
Abstract: Background and aims Fungal symbionts, present in above and in belowground tissues, such as that of Epichlo? endophytes and arbuscular mycorrhizal (AM) fungi, respectively, can modify the responses of host plants to environmental changes. Individual grass plants of the subfamily Pooideae can be host to both a foliar Epichlo? endophytic fungus and root-associated AM fungi. Understanding the multiple interactions among above- and belowground symbionts and their host is an important step in understanding terrestrial ecosystems.
Methods A field experiment was conducted to study the effects of E. gansuensis endophyte and soil moisture on the belowground AM fungal biodiversity associated with Achnatherum inebrians, through amplicon sequencing technology. Soil properties were compared among stands using standard techniques.
Results Our results show that E. gansuensis increased root-associated AM fungal diversity under drought conditions, while decreasing diversity under the water addition treatment. Water addition and water stress treatments decreased the diversity and richness of the AM fungal community in rhizosphere soil compared to the normal treatment. The E. gansuensis altered the composition of the root-associated AM fungal community. Aboveground biomass was closely positively related to the abundance of Funneliformis in the root and the diversity of the rhizosphere soil AM fungal community was positively related to the soil total nitrogen and phosphorus.
Conclusion This study suggested that soil moisture regimes shifted the effects of E. gansuensis on the diversity of the root-associated AM fungal community from positive to negative; moreover, soil moisture and foliar E. gansuensis altered soil properties, thereby affecting belowground AM fungi.