Bacteriocins from plant pathogenic bacteria

Holtsmark, Ingrid; Eijsink, Vincent G. H.; Brurberg, May Bente

doi:10.1111/j.1574-6968.2007.01010.x

Cited by 59 publications

(42 citation statements)

References 56 publications

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“…No signifi cant (P<0.05) differences were registered within the applied pressures due to the fact that low intensities were used. These results are in accordance with previous studies related to pressurization of P. acidilactici cells in the late exponential phase (HOLTSMARK et al, 2008) as signifi cant (P<0.05) inactivation only occurred for pressures ≥200 MPa. The same authors stated that there was good correlation between the log CFU ml -1 and the pressure level applied for ≥100 MPa, but in the present work such correlation was not observed, cells might be not be sensitive to the pressure range or even to variations of 50 MPa (from 100 to 150 MPa).…”

Section: P Acidilactici Ha-6111-2 Stabilitysupporting

confidence: 93%

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Enhancement of bacteriocin production and antimicrobial activity of Pediococcus acidilactici HA-6111-2

García¹,

Castro²,

Casquete³

et al. 2017

Acta Alimentaria

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The effect of sequential treatments of pressure (50-150 MPa, 10 ºC, 5 min) and temperature (57 ºC, 15 min) on the survival and bacteriocin production of Pediococcus acidilactici HA-6111-2 cells in the exponential growth phase was assessed. The growth curves were fi tted with the modifi ed Gompertz model, and the estimated maximum specifi c growth rate was considered to be pressure dependent. A delay in the maximum value of bacteriocin production was registered for more severe pressure conditions, but it was found more notorious for pressure followed by temperature treatments. At lower pressure intensity treatment, regardless of the application order, there was an enhancement of bacteriocin production per cell when compared to the control while maintaining the maximum production value. Bacteriocin production after the treatments can be described by an exponential model.

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Section: P Acidilactici Ha-6111-2 Stabilitysupporting

confidence: 93%

“…Application of bacteriocins as biopreservatives has proven to be effective along the food chain (e.g. veterinary, aquaculture, and agriculture) (DIEZ-GONZALEZ, 2007;HOLTSMARK et al, 2008;BAKKAL et al, 2012).…”

mentioning

confidence: 99%

Enhancement of bacteriocin production and antimicrobial activity of Pediococcus acidilactici HA-6111-2

García¹,

Castro²,

Casquete³

et al. 2017

Acta Alimentaria

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“…These proteins had no effect on seven other bacterial species, indicating that they are putative bacteriocins, proteins that specifically target conspecific or closely related strains (28,50). R. solanacearum has long been known to produce bacteriocins, but their biological role(s) was unknown (38,(51)(52)(53).…”

Section: Figmentioning

confidence: 99%

Tropical Strains of Ralstonia solanacearum Outcompete Race 3 Biovar 2 Strains at Lowland Tropical Temperatures

Huerta

Milling

Allen

2015

Appl Environ Microbiol

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Bacterial wilt, caused by members of the heterogenous Ralstonia solanacearum species complex, is an economically important vascular disease affecting many crops. Human activity has widely disseminated R. solanacearum strains, increasing their global agricultural impact. However, tropical highland race 3 biovar 2 (R3bv2) strains do not cause disease in tropical lowlands, even though they are virulent at warm temperatures. We tested the hypothesis that differences in temperature adaptation and competitive fitness explain the uneven geographic distribution of R. solanacearum strains. Using three phylogenetically and ecologically distinct strains, we measured competitive fitness at two temperatures following paired-strain inoculations of their shared host, tomato. Lowland tropical strain GMI1000 was only weakly virulent on tomato under temperate conditions (24°C for day and 19°C for night [24/19°C]), but highland tropical R3bv2 strain UW551 and U.S. warm temperate strain K60 were highly virulent at both 24/19°C and 28°C. Strain K60 was significantly more competitive than both GMI1000 and UW551 in tomato rhizospheres and stems at 28°C, and GMI1000 also outcompeted UW551 at 28°C. The results were reversed at cooler temperatures, at which highland strain UW551 generally outcompeted GMI1000 and K60 in planta. The superior competitive index of UW551 at 24/19°C suggests that adaptation to cool temperatures could explain why only R3bv2 strains threaten highland agriculture. Strains K60 and GMI1000 each produced different bacteriocins that inhibited growth of UW551 in culture. Such interstrain inhibition could explain why R3bv2 strains do not cause disease in tropical lowlands. Ralstonia solanacearum, which causes bacterial wilt disease of many crops, is found on six continents, and its hosts include plants in over 50 dicot and monocot families. The pathogen forms a heterogenous species complex that contains thousands of distinct strains (1, 2). No single strain can attack all known hosts, but most members of the species complex can wilt tomato. The best way to manage bacterial wilt is by planting resistant crop varieties, but the high variability of the pathogen complicates breeding efforts because wilt resistance is often strain specific (3, 4). Sequencing over 20 diverse strains revealed that R. solanacearum has a fluid genome with evidence of extensive horizontal gene transfer (5-7). However, the specific mechanisms by which this pathogen has adapted to diverse environments and hosts are unknown. For example, most strains of R. solanacearum are tropical or subtropical, but one highly adapted group, known historically and for regulatory purposes as race 3 biovar 2 (R3bv2), causes economically important wilt of both potato and tomato in cool highland tropics (8).R. solanacearum strains fall into four genetically distinct phylotypes that correspond to their geographic origin: phylotypes I (Asia), II (the Americas), III (Africa), and IV (Indonesia) (1) However, because of human activity, multiple phylotypes are now commonly...

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“…In addition, among these interesting strains, it has been reported in previous studies (Kacem et al, 2005Kacem, 2007) that L. plantarum OL15 and OL9 strains produced bacteriocins (proteinaceous antimicrobial substances compound) with inhibitory activity against olive spoilage and phytopathogenic bacteria organisms, including, Pseudomonas genera that can cause severe damage in olive groves and occasionally on the fruits (Holtsmark and al., 2008). This suggests that these strains are favorable for use as starter cultures for olives production.…”

Section: Resultsmentioning

confidence: 98%

Selection of Lactobacillus plantarum strains for their use as starter cultures in Algerian olive fermentations

Mokhbi¹,

Kaïd-Harche²,

Lamri³

et al. 2008

Grasas y Aceites

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RESUMENSelección de cepas de Lactobacillus plantarum para su uso como cultivos iniciadores en la fermentación de aceitunas de Argelia.El objetivo de esta investigación fue evaluar algunos aspectos tecnológicos de cepas de L. plantarum previamente aisladas de aceitunas fermentadas. Para este propósito, 11 cepas fueron usadas para estudiar su susceptibilidad a antibióticos in vitro, resistencia a valores de pH bajos, actividad acidificante, proteolítica, y hemolítica, producción de ácido láctico y exopolisacáridos, y resistencia a la liofilización. En general, las cepas fueron susceptibles a la mayoría de los antibióticos ensayados y mostraron supervivencia a pH 2. La mayoría de las cepas mostraron una actividad de acidificación alta (1.035 ± 0.29 a 0.912 ± 0.21 mmol/l de áci-do láctico) o media (0.556 ± 0.29 a 0.692 ± 0.18 mmol/l) con una buena actividad proteolítica (1.49 ± 0.25 a 5.25 ± 0.11 mg l -1 tirosina). Ninguna de las cepas produjo exopolisacári-dos o hemolisis en sangre de oveja.PALABRAS CLAVE: Aceitunas fermentadas -Antibióti-cos -Cultivos iniciadores -Lactobacillus plantarum. SUMMARY Selection of Lactobacillus plantarum strains for their use as starter cultures in Algerian olive fermentations.The aim of this research was to evaluate some technological traits of L. plantarum strains previously isolated from fermented olives. For this purpose, 11 strains were tested for their in vitro antibiotic susceptibility, resistance to low pH values, acidifying activity, proteolytic activity, haemolytic activity, lactic acid and exopolysaccharide production and resistance to freeze-drying .Collectively, the strains were susceptible to most of the antibiotics tested and showed survival at pH 2. Most strains showed high (1.035 ± 0.29 to 0.912 ± 0.21 mmol/l ± sd of lactic acid) or medium (0.556 ± 0.29 to 0.692 ± 0.18 mmol/l±sd) acidification activity with good proteolytic activity (1.49 ± 0.25 to 5.25 ± 0.11 mg l -1 tyrosine). None of the strains produced exopolysaccharides or haemolysis in sheep's blood.

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Bacteriocins from plant pathogenic bacteria

Cited by 59 publications

References 56 publications

Enhancement of bacteriocin production and antimicrobial activity of Pediococcus acidilactici HA-6111-2

Enhancement of bacteriocin production and antimicrobial activity of Pediococcus acidilactici HA-6111-2

Tropical Strains of Ralstonia solanacearum Outcompete Race 3 Biovar 2 Strains at Lowland Tropical Temperatures

Selection of Lactobacillus plantarum strains for their use as starter cultures in Algerian olive fermentations

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