Bacterial canker caused by Clavibacter michiganensis subsp. michiganensis is known to cause significant economic losses to tomato production worldwide. Biological control has been proposed as an alternative to current chemical containment methods, which are often inefficient and may leave adverse effects on the environment. However, only little headway has so far been made in developing biocontrol strategies against C. michiganensis subsp. michiganensis. To address this knowledge gap, we investigated the antagonistic capacity of PCA, produced by Pseudomonas sp. LBUM223, and DAPG and HCN, both produced by Pseudomonas sp. LBUM300, on C. michiganensis subsp. michiganensis under in vitro and in planta conditions. Nonsynthesizing isogenic mutants of the producer strains were also developed to further dissect the role of each individual metabolite on C. michiganensis subsp. michiganensis biological control. Novel specific quantitative polymerase chain reaction TaqMan assays allowed quantification of C. michiganensis subsp. michiganensis in tomato plants and rhizospheric soil. Pseudomonas spp. LBUM223 and LBUM300 significantly repressed C. michiganensis subsp. michiganensis growth in vitro, while their respective nonproducing mutants showed less or no significant antagonistic activity. In planta, only Pseudomonas sp. LBUM300 was capable of significantly reducing disease development and C. michiganensis subsp. michiganensis rhizospheric population, suggesting that the production of both DAPG and HCN was involved. In summary, simultaneous DAPG/HCN production by Pseudomonas sp. LBUM300 shows great potential for controlling bacterial canker of tomato.
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http://dx.doi.org/10.1094/PHYTO-11-11-0312 | DOI Listing |
Antibiotics (Basel)
November 2024
Department of Biology, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi-shi 274-8510, Chiba, Japan.
Amphibian skin is a valuable source of host defense peptides (HDPs). This study aimed to identify HDPs with novel amino acid sequences from the skin of and analyze their functions. cDNAs encoding HDP precursors were cloned and sequenced using RT-PCR and 3'-RACE.
View Article and Find Full Text PDFJ Environ Manage
January 2025
iB(2) Laboratory, Department of Biology, Faculty of Sciences, University of Porto, Portugal; Instituto de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, Spain; LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Portugal. Electronic address:
The emergence of bacterial resistance and the increasing restrictions on the use of agrochemicals are boosting the search for novel, sustainable antibiotics. Antimicrobial peptides (AMPs) arise as a new generation of antibiotics due to their effectiveness at low doses and biocompatibility. We compared the antimicrobial activity of four promising AMPs (CA-M, BP100, RW-BP100, and 3.
View Article and Find Full Text PDFJ Gen Virol
July 2024
Department of Molecular Biology and Genetics, Bilecik Seyh Edebali University, 11100 Bilecik, Turkey.
subsp. () is an important plant-pathogenic bacterium that causes canker and wilt diseases. Biological control of the disease with bacteriophages is an alternative to conventional methods.
View Article and Find Full Text PDFJ Biotechnol
September 2024
Department of Biotechnology, Yeungnam University, Gyeongsan, Gyeongbuk 38541, South Korea. Electronic address:
Clavibacter michiganensis subsp. michiganensis (Cmm) and C. michiganensis subsp.
View Article and Find Full Text PDFAppl Microbiol Biotechnol
June 2024
Department of Agricultural, Food and Environmental Sciences, University of Perugia, Perugia, Italy.
Bacterial plant diseases are difficult to control as the durability of deployed control measures is thwarted by continuous and rapid changing of bacterial populations. Although application of copper compounds to plants is the most widespread and inexpensive control measure, it is often partially efficacious for the frequent appearance of copper-resistant bacterial strains and it is raising concerns for the harmful effects of copper on environment and human health. Consequently, European Community included copper compounds in the list of substances candidates for substitution.
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