Abstract
Induced systemic resistance to Fusarium wilt and the changes in antioxidative abilities in mycorrhizal strawberry plants were investigated. Strawberry (Fragaria ×ananassa Duch. ‘Nohime’) runner plants were inoculated with arbuscular mycorrhizal fungus (Glomus mosseae) and treated with split root system. Six weeks after AMF inoculation, Fusarium oxysporum f. sp. fragariae were inoculated. Mycorrhizal plants accumulated higher dry weight of shoots and roots than did non-mycorrhizal plants in most of the plots after AMF inoculation. Disease incidence and severity of symptoms were lower in shoots and roots of mycorrhizal plants; induced resistance also appeared in split root-treated mycorrhizal plants. No major difference in antioxidative abilities took place before pathogen inoculation among the plots. However, after pathogen inoculation, mycorrhizal plants showed higher values in the following items; SOD activity, DPPH radical scavenging activity, total polyphenol and ascorbic acid contents; these effects differed with plant portions. From these findings, plant growth enhancement and tolerance to Fusarium wilt including induced resistance occurred in mycorrhizal strawberry plants. In this case, antioxidative abilities increased under pathogen-stressed conditions, so that induced systemic resistance to Fusarium wilt would be associated with such factors.
Published Version
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