The Plant Growth-promoting Fungus Penicillium spp. GP15-1 Enhances Growth and Confers Protection against Damping-off and Anthracnose in the Cucumber

  • Hossain Md. Motaher
    United Graduate School of Agricultural Sciences, Gifu University Bangabandhu Sheikh Mujibur Rahman Agricultural University
  • Sultana Farjana
    United Graduate School of Agricultural Sciences, Gifu University International University of Business Agriculture and Technology
  • Miyazawa Mitsuo
    Faculty of Science and Engineering, Kinki University
  • Hyakumachi Mitsuro
    Faculty of Applied Biological Science, Gifu University

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  • The Plant Growth-promoting Fungus <i>Penicillium</i> spp. GP15-1 Enhances Growth and Confers Protection against Damping-off and Anthracnose in the Cucumber

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Plant growth-promoting fungi (PGPF) have the potential to confer several benefits to plants in terms of growth and protection against pests and pathogens. In the present study, we tested whether a PGPF isolate, Penicillium spp. GP15-1 (derived from zoysiagrass rhizospheres), stimulates growth and disease resistance in the cucumber plant. The use of the barley grain inoculum GP15-1 significantly enhanced root and shoot growth and biomass of cucumber plants. A root colonization study revealed that GP15-1 was a very rapid and efficient root colonizer and was isolated in significantly higher frequencies from the upper root parts than from the middle and lower root parts during the first 14 d of seedling growth. Inoculating the cucumber seedlings with GP15-1 significantly reduced the damping-off disease caused by Rhizoctonia solani, and the disease suppression effects of GP15-1 were considerably influenced by the inoculum potential of both GP15-1 and the pathogen. Treatment with the barley grain inoculum or a cell-free filtrate of GP15-1 increased systemic resistance against leaf infection by the anthracnose pathogen Colletotrichum orbiculare, resulting in a significant decrease in lesion number and size. Molecular and phylogenetic analyses of internal transcribed spacer sequences of the genomic DNA of GP15-1 revealed that the fungal isolate is a strain of either Penicillium neoechinulatum or Penicillium viridicatum.

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