Diseases of cabbage plug seedlings in a commercial nursery in Mie prefecture during August 2004 and March 2005

Kubota, Masaharu; Nakasuji, Satoko; Simizu, Masafumi; Nishi, Kazufumi

doi:10.4165/kapps.48.41

Kansai Byochugai Kenkyukaiho

2006

DOI: 10.4165/kapps.48.41

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Diseases of cabbage plug seedlings in a commercial nursery in Mie prefecture during August 2004 and March 2005

Masaharu Kubota¹,

Satoko Nakasuji

Masafumi Simizu

et al.

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Cited by 2 publications

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“…Recent studies reported that many diseases affect cabbage plug seedlings in large commercial nurseries in Japan ( 17 – 19 , 22 ). The incidence of damping-off, caused by Alternaria brassicicola (Schweinitz) Wiltshire, is the highest during the growing season ( 17 , 18 , 23 , 25 ). A. brassicicola is a well-known seed-borne pathogen of Brassica plants worldwide ( 47 , 52 ).…”

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Biocontrol Potential of an Endophytic Streptomyces sp. Strain MBCN152-1 against Alternaria brassicicola on Cabbage Plug Seedlings

et al. 2017

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In the present study, 77 strains of endophytic actinomycetes isolated from cabbage were screened in order to assess their biocontrol potential against Alternaria brassicicola on cabbage seedlings. In the first and second screening trials, cabbage seedlings pretreated with mycelial suspensions of each isolate were spray-inoculated with A. brassicicola. Strain MBCN152-1, which exhibited the best protection in screening trials and had no adverse effects on seedling growth, was selected for the greenhouse trial. In the greenhouse trial, cabbage seedlings, which had been grown in plug trays filled with soil mix containing spores of MBCN152-1 (1×10 8 spores g -1 of soil mix), were spray-inoculated with A. brassicicola and grown in greenhouse conditions. MBCN152-1 reduced disease incidence and significantly increased the number of viable seedlings. The efficacy of MBCN152-1 against damping-off caused by seed-borne A. brassicicola was then evaluated. Cabbage seeds, artificially infested with A. brassicicola, were sown in soil mix containing MBCN152-1 spores. The disease was completely suppressed when infested seeds were sown in a soil mix blended with MBCN152-1 at 1.5×10 7 spores g -1 of soil mix. These results strongly suggest that MBCN152-1 has the potential to control A. brassicicola on cabbage plug seedlings. MBCN152-1 was identified as a Streptomyces humidus-related species based on 16S rDNA sequencing. Scanning electron microscopy showed that the hyphae of MBCN152-1 multiplied on the surface of the seedlings and penetrated their epidermal cells. In conclusion, strain MBCN152-1 is a promising biocontrol agent against A. brassicicola on cabbage plug seedlings.

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Biocontrol Potential of an Endophytic Streptomyces sp. Strain MBCN152-1 against Alternaria brassicicola on Cabbage Plug Seedlings

et al. 2017

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Pathogenicity of Pythium ultimum var. ultimum to cabbage seedlings

Kubota¹,

Nakasuji

Shimizu

et al. 2006

Kansai Byochugai Kenkyukaiho

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Diseases of cabbage plug seedlings in a commercial nursery in Mie prefecture during August 2004 and March 2005

Cited by 2 publications

References 7 publications

Biocontrol Potential of an Endophytic <i>Streptomyces</i> sp. Strain MBCN152-1 against <i>Alternaria brassicicola</i> on Cabbage Plug Seedlings

Biocontrol Potential of an Endophytic <i>Streptomyces</i> sp. Strain MBCN152-1 against <i>Alternaria brassicicola</i> on Cabbage Plug Seedlings

Pathogenicity of Pythium ultimum var. ultimum to cabbage seedlings

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