Tolerance to Allelopathy and Fusarium Disease, Changes in Antioxidative Substances in Mycorrhizal Asparagus Plants Raised in Decline Soil
2010
Matsubara, Y. | Okada, T. | Nahiyan, A.S.M.
The efficacy of growth control with arbuscular mycorrhizal fungi (AMF) on allelopathy and Fusarium diseases were investigated. Asparagus (Asparagus officinalis L., ‘Welcome’) plants inoculated with 4 AMF species were raised in decline field soil containing allelochemicals determined by bioassay and in commercial substrate. Ten weeks after AMF inoculation, conidial suspensions of Fusarium oxysporum f. sp. asparagi (Foa) and Fusarium proliferatum (Fp) were inoculated to mycorrhizal plants. Dry weight of shoots and roots increased in AMF plants of both the decline soil and substrate 10 weeks after AMF inoculation, regardless of the species. Thus, plant growth promotion via symbiosis and allelopathy tolerance appeared in mycorrhizal asparagus plants. On the other hand, contents of polyphenol and ascorbic acid showed higher values in most of the AMF plants than in non-AMF plants; the effect depends on plant portions. As for disease tolerance, incidence and severity of both Foa and Fp were lower in AMF plants than in non-AMF plants, though the effect differed according to AMF species with Glomus intraradices being most effective. From these findings, it is suggested that plant growth promotion through AMF is effective for inducing tolerance to allelopathy and Fusarium diseases in asparagus plants, and contents of antioxidative substances are stimulated by the symbiosis.
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