| Abstrakt: |
Common scab disease in potatoes is caused by several Streptomyces spp. Although this disease does not affect the yield, it severely affects the marketability. Despite the implementation of many control strategies, efficient methods are still under debate owing to difficulty of usage, high-cost, ineffective, and non-persistence. Therefore, biological control methods are an attractive choice, especially in the field of organic potatoes. We investigated new antagonistic and endophytic Streptomyces sp. from medicinal plants. When this Streptomyces sp. strain 503 was co-cultured with a pathogen, it inhibited the production of spores or aerial mycelium of the pathogen, and the mycelial fragmentation was observed under a scanning electron microscope. In addition, strain 503 could completely inhibit the mycelia growth when the pathogen was introduced 3 days later. Strain 503 was identified as S. flavovirens, which is known to produce mureidomycin based on 16S rRNA gene sequences. Mureidomycin is a bacterial peptidoglycan synthesis inhibitor, and thus, strain 503 has a role in arresting pathogen growth and causing cell burst by inhibiting peptidoglycan synthesis. Furthermore, we confirmed the endophytic activity using a mCherry-tagged strain in the interior of plant stems and roots. In conclusion, because of its mode of action against pathogen and its ability as an endophyte, strain 503 could be a potential environment-friendly biocontrol agent in potato fields against common scab disease. [ABSTRACT FROM AUTHOR] |
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