Journal
MICROORGANISMS
Volume 9, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/microorganisms9040821
Keywords
forest seedling production; antagonistic bacteria; lytic enzymes; phytopathogenic oomycetes; auxin; plant development; biocontrol agent
Categories
Funding
- R&D program for Forest Science Technology - Korea Forest Service (Korea Forestry Promotion Institute) [2020183C10-2022-AA02]
- Korea Forestry Promotion Institute (KOFPI) [2020183C10-2022-AA02] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Bacillus velezensis CE 100 has the potential to control Phytophthora root rot diseases and enhance the growth of Chamaecyparis obtusa seedlings by producing enzymes that inhibit the growth of phytopathogenic oomycetes, and increasing the production of indole-3-acetic acid (IAA) for improved plant growth.
Root rot diseases, caused by phytopathogenic oomycetes, Phytophthora spp. cause devastating losses involving forest seedlings, such as Japanese cypress (Chamaecyparis obtusa Endlicher) in Korea. Plant growth-promoting rhizobacteria (PGPR) are a promising strategy to control root rot diseases and promote growth in seedlings. In this study, the potential of Bacillus velezensis CE 100 in controlling Phytophthora root rot diseases and promoting the growth of C. obtusa seedlings was investigated. B. velezensis CE 100 produced beta-1,3-glucanase and protease enzymes, which degrade the beta-glucan and protein components of phytopathogenic oomycetes cell-wall, causing mycelial growth inhibition of P. boehmeriae, P. cinnamomi, P. drechsleri and P. erythoroseptica by 54.6%, 62.6%, 74.3%, and 73.7%, respectively. The inhibited phytopathogens showed abnormal growth characterized by swelling and deformation of hyphae. B. velezensis CE 100 increased the survival rate of C. obtusa seedlings 2.0-fold and 1.7-fold compared to control, and fertilizer treatment, respectively. Moreover, B. velezensis CE 100 produced indole-3-acetic acid (IAA) up to 183.7 mg/L, resulting in a significant increase in the growth of C. obtusa seedlings compared to control, or chemical fertilizer treatment, respectively. Therefore, this study demonstrates that B. velezensis CE 100 could simultaneously control Phytophthora root rot diseases and enhance growth of C. obtusa seedlings.
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