Modeling red cabbage seed extract effect on Penicillium corylophilum: Relationship between germination time, individual and population lag time

Dagnas, Stéphane; Gougouli, Maria; Onno, Bernard; Koutsoumanis, Konstantinos; Membré, Jeanne‐Marie

doi:10.1016/j.ijfoodmicro.2015.07.008

Cited by 17 publications

(6 citation statements)

References 43 publications

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“…The most intensive growth of mold was observed in ecosystems with a w =0.84–0.90 stored at 24 and 30 °C and also in seeds with a w =0.90 stored at 18 °C. In these ecosystems, after the initial stagnation phase, which consists of the germination of spores and the beginning of exponential growth of mold (Dagnas et al, ; Gougouli and Koutsoumanis, ), fungal activity was detected in a short time (2–6 days) and after 8–20 days the stationary phase of the mold development began.…”

Section: Resultsmentioning

confidence: 99%

Management Control Points Related to the Lag Phase of Fungal Growth in a Stored Rapeseed Ecosystem

Wawrzyniak

Gawrysiak‐Witulska

Ryniecki

2018

J Americ Oil Chem Soc

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The quality of rapeseed oil largely depends on the quality of postharvest preservation of raw seeds. Fungal infestation at early stages of the storage of rapeseeds is a major cause of their spoilage. The knowledge of relations between the storage conditions, fungal contamination, and technological quality of rapeseeds is essential to specify key control points that can be used to improve postharvest management systems and maintain rapeseed quality. The aim of this study was to define decisive control points on the basis of the kinetics of early mold growth in ecosystems of rapeseeds in a hazardous initial microbiological state, stored under various water activity and temperature conditions (a w =0.78-0.96 and t =12-30 C). A correlation between the acid value (AV), germination, and fungal infestation of seeds was found in ecosystems with significant mold activity. The analysis of the mold growth kinetics with regard to AV, seed germination, and visible mold time showed that the detection of early (invisible) fungal growth could be a good basis for determining the time during which rapeseeds should be protected from deterioration. The research results showed how to use the length of the lag phase to identify decisive control points, which are necessary to improve the existing control systems of rapeseed preservation and storage.

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Section: Resultsmentioning

confidence: 99%

Management Control Points Related to the Lag Phase of Fungal Growth in a Stored Rapeseed Ecosystem

Wawrzyniak

Gawrysiak‐Witulska

Ryniecki

2018

J Americ Oil Chem Soc

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“…Dagnas et al . () described an increase in the spread of germination times for conidia of Penicillium corylophilum treated with essential oils within red‐cabbage seed extract. The increase of variability within a cell population can act in such a way that enables the population to overcome/circumvent stress.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, a population of spores has a distribution of lag-phase times and rates of germination; both of these increase at low water-activity. Dagnas et al (2015) described an increase in the spread of germination times for conidia of Penicillium corylophilum treated with essential oils within red-cabbage seed extract. The increase of variability within a cell population can act in such a way that enables the population to overcome/circumvent stress.…”

Section: Optimum Conditions For Xerophilicitymentioning

confidence: 99%

Water‐, pH‐ and temperature relations of germination for the extreme xerophiles Xeromyces bisporus (FRR 0025), Aspergillus penicillioides (JH06THJ) and Eurotium halophilicum (FRR 2471)

Stevenson

Hamill

Dijksterhuis

et al. 2016

Microbial Biotechnology

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SummaryWater activity, temperature and pH are determinants for biotic activity of cellular systems, biosphere function and, indeed, for all life processes. This study was carried out at high concentrations of glycerol, which concurrently reduces water activity and acts as a stress protectant, to characterize the biophysical capabilities of the most extremely xerophilic organisms known. These were the fungal xerophiles: Xeromyces bisporus (FRR 0025), Aspergillus penicillioides (JH06THJ) and Eurotium halophilicum (FRR 2471). High‐glycerol spores were produced and germination was determined using 38 media in the 0.995–0.637 water activity range, 33 media in the 2.80–9.80 pH range and 10 incubation temperatures, from 2 to 50°C. Water activity was modified by supplementing media with glycerol+sucrose, glycerol+NaCl and glycerol+NaCl+sucrose which are known to be biologically permissive for X. bisporus, A. penicillioides and E. halophilicum respectively. The windows and rates for spore germination were quantified for water activity, pH and temperature; symmetry/asymmetry of the germination profiles were then determined in relation to supra‐ and sub‐optimal conditions; and pH‐ and temperature optima for extreme xerophilicity were quantified. The windows for spore germination were ~1 to 0.637 water activity, pH 2.80–9.80 and > 10 and < 44°C, depending on strain. Germination profiles in relation to water activity and temperature were asymmetrical because conditions known to entropically disorder cellular macromolecules, i.e. supra‐optimal water activity and high temperatures, were severely inhibitory. Implications of these processes were considered in relation to the in‐situ ecology of extreme conditions and environments; the study also raises a number of unanswered questions which suggest the need for new lines of experimentation.

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“…Stress resistance of spores and germination properties are both important for colonization but different in nature. Colonies from individual spores that enter a new ecosystem often have longer lag times compared with a population of spores (Gougouli and Koutsoumanis, ; Dagnas et al ., ). This is essentially caused by the phenomenon that the spore that germinates fastest determines the lag time of a population.…”

Section: Introductionmentioning

confidence: 99%

The most heat‐resistant conidia observed to date are formed by distinct strains of Paecilomyces variotii

Brule

Punt

Teertstra

et al. 2019

Environmental Microbiology

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Summary Fungi colonize habitats by means of spores. These cells are stress‐resistant compared with growing fungal cells. Fungal conidia, asexual spores, formed by cosmopolitan fungal genera like Penicillium, Aspergillus and Peacilomyces are dispersed by air. They are present in places where food products are stored and as a result, they cause food spoilage. Here, we determined the heterogeneity of heat resistance of conidia between and within strains of Paecilomyces variotii, a spoiler of foods such as margarine, fruit juices, canned fruits and non‐carbonized sodas. Out of 108 strains, 31 isolates showed a conidial survival >10% after a 10‐min‐heat treatment at 59°C. Three strains with different conidial heat resistance were selected for further phenotyping. Conidia of DTO 212‐C5 and DTO 032‐I3 showed 0.3% and 2.6% survival in the screening respectively, while survival of DTO 217‐A2 conidia was >10%. The decimal reduction times of these strains at 60°C (D60 value) were 3.7 ± 0.08, 5.5 ± 0.35 and 22.9 ± 2.00 min respectively. Further in‐depth analysis revealed that the three strains showed differences in morphology, spore size distributions, compatible solute compositions and growth under salt stress. Conidia of DTO 217‐A2 are the most heat‐resistant reported so far. The ecological consequences of this heterogeneity of resistance, including food spoilage, are discussed.

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Modeling red cabbage seed extract effect on Penicillium corylophilum: Relationship between germination time, individual and population lag time

Cited by 17 publications

References 43 publications

Management Control Points Related to the Lag Phase of Fungal Growth in a Stored Rapeseed Ecosystem

Management Control Points Related to the Lag Phase of Fungal Growth in a Stored Rapeseed Ecosystem

Water‐, pH‐ and temperature relations of germination for the extreme xerophiles Xeromyces bisporus (FRR 0025), Aspergillus penicillioides (JH06THJ) and Eurotium halophilicum (FRR 2471)

The most heat‐resistant conidia observed to date are formed by distinct strains of Paecilomyces variotii

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