Sustainable Approaches to Controlling Plant Pathogenic Bacteria

Kannan, V. Rajesh; Baştaş, Kubilay Kurtuluş

doi:10.1201/b18892

Cited by 37 publications

(5 citation statements)

References 280 publications

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“…In this case, they have clearly reached a point where the knotted root systems cannot sustain the upper parts of the trees; a condition where Ralstonia species are able to multiple rapidly to block the xylem systems. In this regard, it is known that water stress, due to a blocked vascular system, leads to the over production of defense compounds (pectins and tyloses) which reduces the resistance of the host to infection (Kannan and Bastas, 2015). …”

Section: Stress Factors Associated With Infectionmentioning

confidence: 99%

Ralstonia solanacearum and R. pseudosolanacearum on Eucalyptus: Opportunists or Primary Pathogens?

Coutinho

Wingfield

2017

Front. Plant Sci.

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Ralstonia solanacearum and R. pseudosolanacearum are well known primary pathogens of herbaceous crops. Reports of wilt caused by these pathogens in tree species are limited other than on Eucalyptus species. Despite the widespread occurrence of so-called bacterial wilt on eucalypts in tropical and sub-tropical parts of Africa, Asia, and the Americas, there remain many contradictions relating to the disease. Our field observations over many years in most regions where the disease occurs on Eucalyptus show that it is always associated with trees that have been subjected to severe stress. The disease is typically diagnosed by immersing cut stems in water and observing bacterial streaming, but the identity of the bacteria within this suspension is seldom considered. To add to the confusion, pathogenicity tests on susceptible species or clones are rarely successful. When they do work, they are on small plants in greenhouse trials. It has become all to easy to attribute Eucalyptus death exclusively to Ralstonia infection. Our data strongly suggest that Ralstonia species and probably other bacteria are latent colonists commonly occurring in healthy and particularly clonally propagated eucalypts. The onset of stress factors provide the bacteria with an opportunity to develop. We believe that the resulting stress weakens the defense systems of the trees allowing Ralstonia and bacterial endophytes to proliferate. Overall our research suggests that R. solanacearum and R. pseudosolanacearum are not primary pathogens of Eucalyptus. Short of clear evidence that they are primary pathogens of Eucalyptus it is inappropriate to attribute this disease solely to infection by Ralstonia species.

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Section: Stress Factors Associated With Infectionmentioning

confidence: 99%

Ralstonia solanacearum and R. pseudosolanacearum on Eucalyptus: Opportunists or Primary Pathogens?

Coutinho

Wingfield

2017

Front. Plant Sci.

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“…Phytopathogenic bacteria cause disease in many plants, causing symptoms such as spots, cankers, rot, hormonal imbalances that lead to excessive plant growth or growth retardation, root branching, foliar epinasty, among others (Kannan et al, 2015a). These problems affect plants at a qualitative and quantitative level, negatively damaging the world food supply (Kannan et al, 2015b), generating devastating damage and significant economic losses worldwide each year to the food production chain. Among the phytopathogenic bacteria with the highest incidence in agriculture are Clavibacter michiganensis, Pseudomonas syringe, Pseudomonas corrugate, Xanthomonas campestris (Andrade-Bustamante et al, 2017), Erwinia amylovora, Ralstonia solanacearum, and Xylella fastidiosa (Martins et al, 2018).…”

Section: Main Phytopathogenic Bacteriamentioning

confidence: 99%

Application of Streptomyces Antimicrobial Compounds for the Control of Phytopathogens

Pacios‐Michelena

González

Álvarez-Pérez

et al. 2021

Front. Sustain. Food Syst.

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One of the relevant problems in today's agriculture is related to phytopathogenic microorganisms that cause between 30–40% of crop losses. Synthetic chemical pesticides and antibiotics have brought human and environmental health problems and microbial resistance to these treatments. So, the search for natural alternatives is necessary. The genus Streptomyces have broad biotechnological potential, being a promising candidate for the biocontrol of phytopathogenic microorganisms. The efficacy of some species of this genus in plant protection and their continued presence in the intensely competitive rhizosphere is due to its great potential to produce a wide variety of soluble bioactive secondary metabolites and volatile organic compounds. However, more attention is still needed to develop novel formulations that could increase the shelf life of streptomycetes, ensuring their efficacy as a microbial pesticide. In this sense, encapsulation offers an advantageous and environmentally friendly option. The present review aims to describe some phytopathogenic microorganisms with economic importance that require biological control. In addition, it focuses mainly on the Streptomyces genus as a great producer of secondary metabolites that act on other microorganisms and plants, exercising its role as biological control. The review also covers some strategies and products based on Streptomyces and the problems of its application in the field.

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“…There are approximately 150 species of bacteria that cause plant diseases. These phytopathogens can infect a significant variety of crops, mainly of agronomic interest, and are considered the biggest threats to food security worldwide [ 2 3 ]. The major pathogenicity strategies used by bacteria to cause diseases in plants are well understood [ 4 6 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the impact of insertion sequences and transposons in the genomes of the most significant phytopathogenic bacteria

Fernandes,

Campos,

de Assis

et al. 2024

Microbial Genomics

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Genetic variability in phytopathogens is one of the main problems encountered for effective plant disease control. This fact may be related to the presence of transposable elements (TEs), but little is known about their role in host genomes. Here, we performed the most comprehensive analysis of insertion sequences (ISs) and transposons (Tns) in the genomes of the most important bacterial plant pathogens. A total of 35 692 ISs and 71 transposons were identified in 270 complete genomes. The level of pathogen–host specialization was found to be a significant determinant of the element distribution among the species. Some Tns were identified as carrying virulence factors, such as genes encoding effector proteins of the type III secretion system and resistance genes for the antimicrobial streptomycin. Evidence for IS-mediated ectopic recombination was identified in Xanthomonas genomes. Moreover, we found that IS elements tend to be inserted in regions near virulence and fitness genes, such ISs disrupting avirulence genes in X. oryzae genomes. In addition, transcriptome analysis under different stress conditions revealed differences in the expression of genes encoding transposases in the Ralstonia solanacearum, X. oryzae, and P. syringae species. Lastly, we also investigated the role of Tns in regulation via small noncoding regulatory RNAs and found these elements may target plant-cell transcriptional activators. Taken together, the results indicate that TEs may have a fundamental role in variability and virulence in plant pathogenic bacteria.

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Sustainable Approaches to Controlling Plant Pathogenic Bacteria

Cited by 37 publications

References 280 publications

Ralstonia solanacearum and R. pseudosolanacearum on Eucalyptus: Opportunists or Primary Pathogens?

Ralstonia solanacearum and R. pseudosolanacearum on Eucalyptus: Opportunists or Primary Pathogens?

Application of Streptomyces Antimicrobial Compounds for the Control of Phytopathogens

Investigating the impact of insertion sequences and transposons in the genomes of the most significant phytopathogenic bacteria

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