Characterisation of Pseudomonas coleopterorum, a new pathogen causing bacterial leaf spot on common cocklebur (Xanthium strumarium) in Iran

Weeds are known as the most important pests of crops. The use of biological methods for weed control has numerous advantages, such as its ability to positively affect ecosystems and human health through the reduction of harmful herbicide residues in soil, water, and crops. After the occurrence of le...

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Published inBiocontrol science and technology Vol. 35; no. 2; pp. 172 - 186
Main Authors Heydari Rashnoo, Fatemeh, Sharifi, Rouhallah, Moarrefzadeh, Nahid, Marefat, Alireza, Hosseini, Saman
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 01.02.2025
Taylor & Francis Ltd
Subjects
Bacteria
Biochemical characteristics
Biochemistry
Biocontrol
Bioherbicide
Biopesticides
Crops
DNA-directed RNA polymerase
Environmental management
Gene sequencing
Herbicide residues
Herbicides
Host range
Human performance
Leafspot
Necrosis
Pathogenicity
Pests
Pseudomonas
RNA polymerase
rpoD gene
Safety management
Signs and symptoms
Soil water
Strains (organisms)
Weed control
Weeds
Xanthium strumarium
Iran
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ISSN0958-3157
1360-0478
DOI10.1080/09583157.2024.2433550

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Summary:Weeds are known as the most important pests of crops. The use of biological methods for weed control has numerous advantages, such as its ability to positively affect ecosystems and human health through the reduction of harmful herbicide residues in soil, water, and crops. After the occurrence of leaf spot symptoms in common cocklebur (Xanthium strumarium L.) weed in northwestern Iran, the bacterial agents were isolated to obtain species with bioherbicide potential. Based on phenotypic and biochemical characteristics, as well as 16SrRNA and RNA polymerase subunit D (rpoD) genes sequencing, the causative bacteria were identified as Pseudomonas coleopterorum. The aggressive isolates (9N and 6N) were able to cause severe leaf-spotting lesions and tissue necrosis in common cocklebur, but they were not able to cause symptoms in the main crops in the region. To the best of our knowledge, this is the first report of leaf spot disease and the bioherbicidal potential of P. coleopterorum against common cocklebur in the world. In conclusion, these bacterial strains have the potential to be used in the integrated management of common cocklebur. However, before the potential of these bacterial strains as commercial bioherbicides could be realised, research into their field efficacy and environmental safety is necessary.
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ISSN:0958-3157
1360-0478
DOI:10.1080/09583157.2024.2433550