Flavobacterium spp. – Characteristics, Occurrence, and Toxicity

Waśkiewicz, Agnieszka; Irzykowska, Lidia

doi:10.1016/b978-0-12-384730-0.00126-9

Cited by 40 publications

(27 citation statements)

References 35 publications

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“…The observed sensitivity of Flavobacterium spp. to osmotic stress is in accordance with the reports of Waśkiewicz and Irzykowska (2014) who suggested that the species of Flavobacterium could be sensitive to salt stress. Also, E. rhapontici is a bacterial plant pathogen that causes seed-borne diseases in pulses and cereals (Hsieh et al 2010); however, very few or no studies have been conducted on the response of E. rhapontici to osmotic stress.…”

Section: Discussionsupporting

confidence: 92%

Comparative Effects of Individual and Consortia Plant Growth Promoting Bacteria on Physiological and Enzymatic Mechanisms to Confer Drought Tolerance in Maize (Zea mays L.)

Saleem

Nawaz

Hussain

et al. 2021

J Soil Sci Plant Nutr

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Mitigation strategies based on plant–microbe interactions to increase the performance of plants under water-deficit conditions are well documented. However, little is known about a suitable consortium of bacterial inoculants and underlying physiological and enzymatic events to improve drought tolerance in maize. We performed laboratory and pot experiments to understand the synergistic interactions among plant growth-promoting bacteria to alleviate the drought-induced damages in maize. Initially, ten bacterial strains were evaluated for their osmotic stress tolerance capacity by growing them in a media containing 0, 10, 20, and 30% polyethylene glycol (PEG-6000). Also, the seeds of a drought tolerant (NK-6654) and sensitive (SD-626) maize cultivar were inoculated with these bacterial strains in the first pot experiment to determine their effects on the growth and physiological processes. Later, in the second pot experiment, the best performing inoculants were selected to study the individual and synergistic effects of bacterial inoculation to confer drought tolerance in maize. Our findings showed that the inoculation with tolerant strains resulted in higher photosynthetic activity (25–39%), maintenance of leaf water status (14–18%) and pigments (27–32%), and stimulation of antioxidant machinery (28–38%) than no inoculation in water-stressed maize seedlings. Moreover, the treatment with bacteria consortia further stimulated the drought protective mechanisms and resulted in higher efficiency of photosynthetic (47–61%) and antioxidant systems (42–62%) than the individual inoculants under water-deficit conditions. We conclude that the inoculation with microbial consortia regulates water uptake, photosynthetic performance, and stress metabolites to minimize drought-induced damages in maize.

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Section: Discussionsupporting

confidence: 92%

Comparative Effects of Individual and Consortia Plant Growth Promoting Bacteria on Physiological and Enzymatic Mechanisms to Confer Drought Tolerance in Maize (Zea mays L.)

Saleem

Nawaz

Hussain

et al. 2021

J Soil Sci Plant Nutr

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“…Flavobacterium columnare is a well-known infectious disease agent in freshwater fish farming ( Newton et al 1997 ; Waskiewicz and Irzykowska 2014 ). Flavobacterium columnare is the etiological cause of columnaris disease, which predominantly manifests itself as ulcerations of the gills and of the skin.…”

Section: Introductionmentioning

confidence: 99%

Conserved QTL and chromosomal inversion affect resistance to columnaris disease in 2 rainbow trout (Oncorhyncus mykiss) populations

Calboli

Koskinen

Nousianen

et al. 2022

G3 Genes|Genomes|Genetics

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We present a comparative genetic analysis of the quantitative trait loci (QTL) underlying resistance to warm water columnaris disease in two farmed rainbow trout (Oncorhynchus mykiss) populations. We provide evidence for the conservation of a major QTL on Omy03, and the putative role played by a chromosomal rearrangement on Omy05. A total of 3,962 individuals from the two populations experienced a natural Flavobacterium columnare outbreak. Data for 25,823 genome-wide SNPs were generated for both cases (fatalities) and controls (survivors). FST and pairwise additive genetic relationships suggest that, despite being currently kept as separate broodstocks, the two populations are closely related. Association analyses identified a major QTL on chromosome Omy03 and a second smaller QTL on Omy05. QTL on Omy03 consistently explained 3%-11% of genetic variation in both populations, whereas QTL on Omy05 showed different degree of association across populations and sexes. The QTL on Omy05 was found within a naturally occurring, 54.84 cM long inversion which is easy to tag due to a strong linkage disequilibrium between the 375 tagging SNPs. The ancestral haplotype on Omy05 was associated with decreased mortality. Genetic correlation between mortality in the two populations was estimated at 0.64, implying that the genetic basis of resistance is partly similar in the two populations. Our QTL validation identifies markers that can be potentially used to complement breeding value evaluations to increase resistance against columnaris disease, and help to mitigate effects of climate change on aquaculture.

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“…Bacteria belonging to genus Flavobacterium have been identified as a group of bacteria able to persist in a latent form in the aquatic environment (Waśkiewicz & Irzykowska, 2014). F. psychrophilum is a Gram-negative, yellow-pigmented bacterium, responsible for causing cold water disease (CWD) (Borg, 1948;Holt, Rohovec, & Fryer, 1993), or rainbow trout fry syndrome (RTFS) (Lorenzen, 1994;Rangdale, 1995) in salmonids and other freshwater fish.…”

mentioning

confidence: 99%

Biofilm formation ofFlavobacterium psychrophilumon various substrates

et al. 2018

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The ability of Flavobacterium psychrophilum to adhere to and form biofilms on different types of materials used on rainbow trout (Oncorhynchus mykiss) farms was evaluated in this study. F. psychrophilum NCIMB 1947T, was inoculated onto a variety of different surfaces, including stainless steel, plastic, glass, wood, and zinc pyrithione encapsulated antibacterial plastic. The samples were then cultured in a humidified chamber or transferred into fish tanks containing either (1) freshwater or (2) filtered lake water. The formation of biofilms was quantified by fluorescent microscopy. F. psychrophilum formed biofilms on all of the surfaces tested; however, the adherence of the bacterium to the antibacterial plastic was much lower than the attachment observed on the other surfaces, illustrating the bacteriostatic properties of this material for F. psychrophilum. Moreover, bacterial numbers were greater on the surfaces maintained in lake water compared with those maintained in freshwater. The mineral composition of the lake water may have been responsible for the increased bacterial adherence observed between the two types of water. Treatment of the water, regular cleaning of equipment and the use of antimicrobial material to house the fish may help reduce biofilm formation by F. psychrophilum in fish farming systems.

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Flavobacterium spp. – Characteristics, Occurrence, and Toxicity

Cited by 40 publications

References 35 publications

Comparative Effects of Individual and Consortia Plant Growth Promoting Bacteria on Physiological and Enzymatic Mechanisms to Confer Drought Tolerance in Maize (Zea mays L.)

Comparative Effects of Individual and Consortia Plant Growth Promoting Bacteria on Physiological and Enzymatic Mechanisms to Confer Drought Tolerance in Maize (Zea mays L.)

Conserved QTL and chromosomal inversion affect resistance to columnaris disease in 2 rainbow trout (Oncorhyncus mykiss) populations

Biofilm formation ofFlavobacterium psychrophilumon various substrates

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