Growth inhibition and induction of systemic resistance against Pythium aphanidermatum by Bacillus simplex strain HS-2. Issue 12 (2nd December 2018)

• Record Type: Journal Article
• Authors: Miao, Guo-peng; Han, Juan; Wang, Cheng-run; Zhang, Ke-gui; Wang, Shun-chang
• Is Part Of: Biocontrol science and technology. Volume 28:Issue 12(2018)
• Page Start: 1114
• Page End: 1127
• Publication Date: 2018-12-02
• Subjects: Bacillus simplex -- Pythium aphanidermatum -- antibiosis -- induced systemic resistance -- priming; Pests -- Biological control -- Periodicals; Weeds -- Biological control -- Periodicals; Pesticides -- Environmental aspects -- Periodicals; Plants, Protection of -- Periodicals; Plants -- Biological control -- Periodicals; Agricultural pests -- Control -- Periodicals; Pest Control, Biological -- Periodicals; 632.96
• DOI: 10.1080/09583157.2018.1514585
• Languages: English
• ISSNs: 0958-3157

Abstract

ABSTRACT: Biological control of plant disease with plant growth-promoting rhizobacteria (PGPR) has increasingly become noteworthy as they provide an alternative and supplement to synthetic chemicals without environmental contamination. Numerous Bacillus species have been used for seed treatment, induction of systemic resistance and suppression of both root and foliar disease-causing organisms. As a Bacillus species, Bacillus simplex also features antifungal and plant growth-promoting activities, but its ability to induce systemic resistance remains obscure. In this study, a Bacillus simplex strain HS-2 was isolated with both in vitro and in vivo activities against Pythium aphanidermatum in tobacco. The early plant defence responses were investigated to further illuminate the mechanisms by which the strain confers plant protection. Results showed that HS-2 primed tobacco for pathogen challenge through enhancing reactive oxygen species production and callose deposition in roots, that is, establishing a systemic resistance potential state. Bacillus simple x strain HS-2 is involved in both jasmonic acid/ethylene- and salicylic acid-dependent defence signals, as proven by the synergistic elicitation of gene expression for both pathways. However, sequential priming for different signal pathways may exist. Thus, the discovery and characterisation of Bacillus simplex strain HS-2 provide a novel biocontrol agent for plant diseases.