RT Journal Article SR Electronic T1 Broad-spectrum inhibition of Phytophthora infestans by root endophytes JF bioRxiv FD Cold Spring Harbor Laboratory SP 107052 DO 10.1101/107052 A1 Sophie de Vries A1 Janina K. von Dahlen A1 Anika Schnake A1 Sarah Ginschel A1 Barbara Schulz A1 Laura E. Rose YR 2017 UL http://biorxiv.org/content/early/2017/02/08/107052.abstract AB • Phytophthora infestans (Phy. infestans) is a devastating pathogen of tomato and potato. It readily overcomes resistance genes and applied agrochemicals. Fungal endophytes provide a largely unexplored avenue of control against Phy. infestans. Not only do endophytes produce a wide array of bioactive metabolites, they may also directly compete with and defeat pathogens in planta.• Twelve fungal endophyte isolates from different plant species were tested in vitro for their production of metabolites with anti-Phy. infestans activity. Four well-performing isolates were evaluated for their ability to suppress nine isolates of Phy. infestans on plates and in planta.• Two endophytes reliably inhibited all Phy. infestans on plates, of which Phoma eupatorii isolate 8082 was the most promising. It nearly abolished infection by Phy. infestans in planta.• Here we present a biocontrol agent, which can inhibit a broad-spectrum of Phy. infestans isolates. Such broadly acting inhibition is ideal, because it allows for effective control of genetically diverse pathogen isolates and may slow the adaptation by Phy. infestans.