11丛植真菌与入侵植物之间的反馈作用.pdf

Positive Feedback between Mycorrhizal Fungi and Plants Influences Plant Invasion Success and Resistance to Invasion 1 1,2 1 1 3 1 Qian Zhang , Ruyi Yang , Jianjun Tang , Haishui Yang , Shuijin Hu , Xin Chen * 1 College of Life Sciences, Zhejiang University, Hangzhou, China, 2 College of Environmental Science, Anhui Normal University, Wuhu, China, 3 Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina, United States of America Abstract Negative or positive feedback between arbuscular mycorrhizal fungi (AMF) and host plants can contribute to plant species interactions, but how this feedback affects plant invasion or resistance to invasion is not well known. Here we tested how alterations in AMF community induced by an invasive plant species generate feedback to the invasive plant itself and affect subsequent interactions between the invasive species and its native neighbors. We first examined the effects of the invasive forb Solidago canadensis L. on AMF communities comprising five different AMF species. We then examined the effects of the altered AMF community on mutualisms formed with the native legume forb species Kummerowia striata (Thunb.) Schindl. and on the interaction between the invasive and native plants. The host preferences of the five AMF were also assessed to test whether the AMF form preferred mutualistic relations with the invasive and/or the native species. We found that S. canadensis altered AMF spore composition by increasing one AMF species (Glomus geosporum) while reducing Glomus mosseae, which is the dominant species in the field. The host preference test showed that S. canadensis had promoted the abundance of AMF species (G. geosporum) that most promoted it