Non-specific transient mutualism between the plant parasitic nematode, Bursaphelenchus xylophilus, and the opportunistic bacterium Serratia quinivorans BXF1, a plant-growth promoting pine endophyte with antagonistic effects Francisco X. Nascimento 1,2 , Margarida Espada 1 , Pedro Barbosa 1 , Márcio J. Rossi 2 Cláudia S. L. Vicente 1,3 , Manuel Mota 1,4 1- Nemalab/ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Departamento de Biologia, Universidade de Évora, Núcleo da Mitra, Ap. 94, 7002-554 Évora, Portugal 2- Departamento de Microbiologia, Laboratório de Microbiologia do Solo, Universidade Federal de Santa Catarina, Florianópolis SC 88040-900, Brazil 3- Department of Environmental Biology, College of Bioscience & Biotechnology, Chubu University, 1200 Matsumoto, Kasugai, Aichi 487-8501, Japan 4- Departamento Ciências da Vida, EPCV, Universidade Lusófona de Humanidades e Tecnologias, C. Grande 376, 1749-024 Lisboa, Portugal Corresponding author: fxnascimento@gmail.com Keywords: Serratia, Bursaphelenchus xylophilus, pine wilt disease, nematode, plant- growth-promoting bacteria, endophyte This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as an ‘Accepted Article’, doi: 10.1111/1462-2920.13568 This article is protected by copyright. All rights reserved.