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Arbuscular mycorrhiza-mediated resistance in tomato against Cladosporium fulvum-induced mould disease

Arbuscular mycorrhiza-mediated resistance in tomato against Cladosporium fulvum-induced mould disease

Journal of Phytopathology 166(1): 67-74

Root colonization with arbuscular mycorrhizal fungi (AMF) enhances plant resistance particularly against soil-borne pathogenic fungi. In this study, mycorrhizal inoculation with Glomus mosseae (Gm) significantly alleviated tomato mould disease caused by the air-borne fungal pathogen, Cladosporium fulvum (Cf). The disease index (DI) in local leaves (receiving pathogen inoculation) and systemic leaves (just above the local leaf without pathogen inoculation) was 36.4% and 11.7% in mycorrhizal plants, respectively, whereas DI was 59.6% and 36.4% in the corresponding leaves of AMF non-inoculated plants, after 50days of Gm inoculation, corresponding to 15days after Cf inoculation by leaf infiltration. Foliar spray inoculation with Cf also revealed that AMF pre-inoculated plants had a higher resistance against subsequent pathogen infection, where the DI was 41.3% in mycorrhizal plants vs. 64.4% in AMF non-inoculated plants. AMF-inoculated plants showed significantly higher fresh and dry weight than non-inoculated plants under both control (without pathogen) and pathogen treatments. AMF-inoculated plants exhibited significant increases in activities of superoxide dismutase and peroxidase, along with decreases in levels of H2O2 and malondialdehyde, compared with non-inoculated plants after pathogen inoculation. AMF inoculation led to increases in total chlorophyll contents and net photosynthesis rate as compared with non-inoculated plants under control and pathogen infection. Pathogen infection on AMF non-inoculated plants led to decreases in chlorophyll fluorescence parameters. However, pathogen infection did not affect these parameters in mycorrhizal plants. Taken together, these results indicate that AMF colonization may play an important role in plant resistance against air-borne pathogen infection by maintaining redox poise and photosynthetic activity.

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Accession: 066349405

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DOI: 10.1111/jph.12662

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