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The use of Pseudomonas spp. as bacterial biocontrol agents to control plant diseases

Code: 9781801460187
Monica Höfte, Ghent University, Belgium

Chapter synopsis: Most Pseudomonas biocontrol strains are associated with the rhizosphere of plants, where they control soil pathogens by antibiosis or competition, and leaf pathogens via induced systemic resistance. Genome mining and the division of the vastly heterogeneous genus Pseudomonas in phylogenomic (sub)groups has clarified the relation between biocontrol characteristics and phylogeny. Based on their activity, Pseudomonas biocontrol strains come in three types. A first type, represented by P. chlororaphis, P. protegens, P. corrugata and P. aeruginosa (sub)group strains, produces an arsenal of secondary metabolites with broad antimicrobial activity. The second type is found in the P. putida, P. fluorescens, P. koreensis, P. mandelii, and P. gessardii (sub)group. The spectrum of biocontrol properties of these strains is less diverse and involves siderophores and cyclic lipopeptides. The third type colonizes above-ground plant parts. Strains from this type mainly belong to the P. syringae group and are used to control postharvest pathogens. This chapter starts with recent advances in Pseudomonas taxonomy and a summary of its most important biocontrol traits. It then provides an overview of the most important Pseudomonas groups and subgroups harboring biocontrol strains. Examples of well-characterized and representative biocontrol strains show the links between phylogeny, ecology and biocontrol traits. The chapter concludes by reviewing commercially-available biocontrol strains.

DOI: 10.19103/AS.2021.0093.11

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Table of contents 1 Introduction 2 Pseudomonas taxonomy 3 Plant-beneficial Pseudomonas strains 4 Secondary metabolite production in Pseudomonas biocontrol strains 5 Secretion systems that play a role in biocontrol 6 Pseudomonas biocontrol strains: Pseudomonas protegens subgroup 7 Pseudomonas biocontrol strains: Pseudomonas chlororaphis subgroup 8 Pseudomonas biocontrol strains: Pseudomonas corrugata subgroup 9 Pseudomonas biocontrol strains: Pseudomonas fluorescens subgroup 10 Pseudomonas biocontrol strains: Pseudomonas koreensis subgroup 11 Pseudomonas biocontrol strains: Pseudomonas mandelii subgroup and Pseudomonas gessardii subgroup 12 Pseudomonas biocontrol strains: Pseudomonas putida group 13 Pseudomonas biocontrol strains: Pseudomonas syringae group and Pseudomonas aeruginosa group 14 Commercial Pseudomonas-based bioprotectants 15 Conclusion 16 Where to look for further information 17 Acknowledgements 18 References

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