Phenylphenalenones protect banana plants from infection by Mycosphaerella fijiensis and are deactivated by metabolic conversion.
Phenylphenalenones, polycyclic aromatic natural products from some monocotyledonous plants, are known as phytoalexins in banana (Musa spp.). In this study, (1) H nuclear magnetic resonance (NMR)-based metabolomics along with liquid chromatography and mass spectrometry were used to explore the chemical responses of the susceptible 'Williams' and the resistant 'Khai Thong Ruang' Musa varieties to the ascomycete fungus Mycosphaerella fijiensis, the agent of the black leaf Sigatoka disease. Principal component analysis discriminated strongly between infected and non-infected plant tissue, mainly because of specialized metabolism induced in response to the fungus. Phenylphenalenones are among the major induced compounds, and the resistance level of the plants was correlated with the progress of the disease. However, a virulent strain of M. fijiensis was able to overcome plant resistance by converting phenylphenalenones to sulfate conjugates. Here, we report the first metabolic detoxification of fungitoxic phenylphenalenones to evade the chemical defence of Musa plants.
Max-Planck Institut für Chemische Ökologie, Beutenberg Campus, Hans-Knöll-Strasse 8, Jena, 07745, Germany.
William
W
Hidalgo
Max-Planck Institut für Chemische Ökologie, Beutenberg Campus, Hans-Knöll-Strasse 8, Jena, 07745, Germany.
Jima N
JN
Chandran
Max-Planck Institut für Chemische Ökologie, Beutenberg Campus, Hans-Knöll-Strasse 8, Jena, 07745, Germany.
Riya C
RC
Menezes
Instituto de Química, Universidad de Antioquia, Calle 67# 53-108, Medellín, A.A. 1226, Colombia.
Felipe
F
Otálvaro
Max-Planck Institut für Chemische Ökologie, Beutenberg Campus, Hans-Knöll-Strasse 8, Jena, 07745, Germany.
Bernd
B
Schneider
D000935:Antifungal Agents / Q000494:pharmacology; D001203:Ascomycota / Q000187:drug effects / Q000502:physiology*; D001681:Biological Assay; D018533:Biomass; D002851:Chromatography, High Pressure Liquid; D054884:Host-Pathogen Interactions / Q000187:drug effects; D055442:Metabolome / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D028521:Musa / Q000187:drug effects / Q000378:metabolism* / Q000382:microbiology*; D043803:Phenalenes / Q000737:chemistry / Q000494:pharmacology*; D010935:Plant Diseases / Q000382:microbiology*; D025341:Principal Component Analysis; D066244:Proton Magnetic Resonance Spectroscopy
D000935:Antifungal Agents; D043803:Phenalenes
Musa; detoxification; metabolomics; sulfate conjugates