Suppression of Thielaviopsis ethacetica wilt and root rot, the emerging pathogen on bell pepper (Capsicum annuum), and plant growth promotion properties by the safety indigenous Streptomyces SBcT04

• Published in: Physiological and molecular plant pathology 2024-11, Vol.134, p.102464, Article 102464
• Main Authors: Le-Thi, Loan, Tran, Kim-Diep, Vo, Hoai-Hieu, Nguyen-Van, Tu, Nguyen-Thi, Tam, Nong-Thi, Anh-Truc, Vu, Ngoc-Duong, Phan, Nha-Hoa
• Format: Article
• Language: English
• Subjects: Bell pepper plant; Biological control; Capsicum annuum; crop yield; disease severity; Fungal pathogens; fungi; growth promotion; host plants; Indigenous actinomycetes; indole acetic acid; nitrogen; pathogens; plant growth; Plant growth promotion; plant pathology; root rot; Safety actinomycetes; siderophores; Streptomyces; sweet peppers; Thielaviopsis
• ISSN: 0885-5765
• DOI: 10.1016/j.pmpp.2024.102464

Thielaviopsis ethacetica is an emerging pathogen responsible for wilt and root rot in bell peppers, significantly impacting crop yield. Biological control of the fungal pathogen provides significant advantages as a safe and efficient alternative to excessive chemical fungicides for managing plant diseases. Studying the screened and selected potential actinomycete strain from the indigenous collection is a quick and efficient measure to protect the yield of local bell pepper crops. The research assessed the indigenous actinomycete's ability to inhibit plant pathogens and promote plant growth both in vitro and in vivo. The Streptomyces SBcT04 was the most effective against T. ethacetica TROC-2 pathogen in vitro. The inhibition percentage reached 89.15 ± 0.46 %. SBcT04 also effectively promoted plant growth properties in vitro. This strain fixed nitrogen and produced substantial amountsof indole-3-acetic acid (IAA), siderophores, and enzymes. Furthermore, the safety characteristics of SBcT04 for both the host plant (in vivo) and animals (in vitro) were confirmed. Streptomyces SBcT04 significantly processed pathogens, resulting in a reduction of approximately 40 % in disease severity. Additionally, SBcT04 significantly promoted the host plant's growth, even in the presence of T. ethacetica TROC-2 infection. The indigenous Streptomyces SBcT04 efficiently inhibited T. ethacetica and significantly enhanced bell pepper plant growth. These advantageous characteristics of SBcT04 indicate its potential to foster secure and sustainable local bell pepper agricultural output. •The indigenous Streptomyces SBcT04 strain inhibited T. ethacetica in vitro and in vivo.•The SBcT04 strain has effective plant growth promotion properties in vitro.•The SBcT04 strain is safe for plants (in vivo) and animals (in vitro).•The SBcT04 strain excellently promoted bell pepper plant growth in a pot experiment.•Even with infection, SBcT04 effectively promoted bell pepper plant growth.