DIFFERENTIAL SENSITIVITY OF DIPHENYL-SENSITIVE AND DIPHENYL-TOLERANT STRAINS OF FUNGI TO CHLORINATED NITROBENZENES AND TO SOME DIPHENYL DERIVATIVES

1965 ◽  
Vol 43 (6) ◽  
pp. 765-775 ◽  
Author(s):  
S. G. Georgopoulos ◽  
Vassiliki E. Vomvoyanni
Keyword(s):  
Spore Germination ◽  
Germ Tube ◽  
Mutant Gene ◽  
Inhibitory Effect ◽  
Differential Sensitivity ◽  
Subsequent Growth ◽  
Cross Tolerance ◽  
Selective Action ◽  
Fungus Species

In Hypomyces solani f. cucurbitae the inhibitory effect of diphenyl on spore germination, germ tube development, and subsequent growth was overcome by mutation to chloronitrobenzene tolerance at any of three previously known loci. Sectoring under the selective action of diphenyl similarly resulted in tolerance to chloronitrobenzenes. One mutant gene is sufficient to give the maximum diphenyl tolerance possible. Results of cross-tolerance tests with differentially sensitive strains of three other fungi showed the same relationship between diphenyl tolerance and chloronitrobenzene tolerance. Neither volatilities nor relative saturations were found to be of importance in an understanding of the reason for this relationship. Diphenyl-tolerant strains are also tolerant to compounds derived from diphenyl by simple substitutions. The magnitude of the tolerance may be influenced by the substituent, the position, and the fungus species.

scholarly journals Inhibitory effect of Pseudomonas spp. on the development of Botrytis cinerea and Penicillium expansum

2010 ◽  
Vol 40 (No. 4) ◽  
pp. 128-134 ◽  
Author(s):  
H. Bryk ◽  
B. Dyki ◽  
P. Sobiczewski
Keyword(s):  
Botrytis Cinerea ◽  
Spore Germination ◽  
Germ Tube ◽  
Inhibitory Effect ◽  
Penicillium Expansum ◽  
Bacterial Strains ◽  
Liquid Cultures ◽  
Pseudomonas Spp ◽  
Apple Leaves ◽  
Germ Tube Elongation

The influence of antagonistic Pseudomonas spp. on the development of Botrytis cinerea and Penicillium expansum was studied in liquid cultures. Two strains of Pseudomonas spp. (B194 and B224), originally isolated from apple leaves and fruits, respectively, inhibited spore germination and germ tube elongation of B. cinerea or P. expansum. The inhibitory effect depended on the concentration of bacteria in the cultures. After a prolonged time of incubation (48–76 h) lysis and fragmentation of hyphae of both fungi was observed. In some cases the hyphae of B. cinerea developed abnormally if the bacterial strains were present – the hyphal tips were swollen and ball-shaped spore-like structures aggregated in chains were formed.

Aliphatic acids as spore germination inhibitors of wood-decay fungi in vitro

1985 ◽  
Vol 63 (2) ◽  
pp. 337-339 ◽  
Author(s):  
Elmer L. Schmidt
Keyword(s):  
Spore Germination ◽  
Germ Tube ◽  
White Rot Fungi ◽  
Wood Decay ◽  
White Rot ◽  
Malt Extract ◽  
Decay Fungi ◽  
Aliphatic Acids ◽  
Wood Decay Fungi

Influences of eight saturated aliphatic acids (C5–C10, C12, and C16) on basidiospores of four isolates of wood-decay fungi (Poria tenuis and Trametes hispida, white rot fungi, and two isolates of the brown rot fungus Gloeophyllum trabeum) were observed in vitro. Spore responses after 24 h on malt extract agar containing 10, 102 or 103 ppm of each acid included normal germination, delay of germ tube emergence, vacuolation and degeneration of spore cytoplasm, and prevention of germ tube development without spore destruction. Acids of chain length C5–C10 prevented spore germination and killed spores of all fungi at concentrations of 20–50 ppm in media, whereas other acids tested were less active. Spore germination assay of decay fungi may prove useful as a screening tool to compare potency of wood preservatives.

scholarly journals Effect of Pasteurized Low Acidic Indigenous Beverages Produced in Northern Cameroon on Germination of Bacillus and Geobacillus Spores Species

2021 ◽  
Vol 8 (2) ◽  
pp. 52-62
Author(s):  
James Ronald Bayoï ◽  
François-Xavier Etoa
Keyword(s):  
Bacillus Subtilis ◽  
Incubation Time ◽  
Spore Germination ◽  
Inhibitory Effect ◽  
Geobacillus Stearothermophilus ◽  
Northern Cameroon ◽  
Natural Preservatives ◽  
Acidic Beverages ◽  
Good Hygiene ◽  
Spore Forming Bacteria

The present study aimed to investigate the influence of three commercially available traditional acidic beverages on spore germination. “Foléré”, red “té” and white “mpedli” sorghum beers have been produced at the laboratory scale assisted by experimented producers, and pH of samples were adjusted at 2.01, 2.63 and 2.8 respectively, then they were pasteurized. The samples produced were tested on four spore-forming bacteria (Bacillus cereus, Bacillus megapterium, Bacillus subtilis and Geobacillus stearothermophilus) and germination was assessed both on culture plate media and by loss of optical density (OD) methods. The results obtained showed that “foléré” at pH 2.01, and both indigenous sorghum red beer at pH 2.63 and white beer at pH 2.8 were effective on spore germination, and efficacy significantly increase (p < 0.05) with the incubation time. The presence of alcohol in the pasteurized white (2.43 %) and red (4.7 %) sorghum beers has significantly (p < 0.05) improved the anti-germinating activity compared to the non-alcoholic “foléré” beverage. The sensitivity of B. cereus and B. subtilis was positively and significantly correlated (r = 0.880; p < 0.01) likewise the sensitivity of B. megapterium and G. stearothermophilus (r = 0.725; p < 0.05), and the activity of traditional white and red sorghum beers was found to be very significant (p < 0.05) for each couple respectively. The loss of OD showed an inhibitory effect of indigenous beverages germination and exhibited a microcycle on all tested spore-forming bacteria. It was concluded that if the good hygiene and manufacturing practices were applied for production of indigenous beverages, they might easily be used as natural preservatives and for prevention of gastroenteritis induced by germination and outgrowth of spore-forming bacteria like B. cereus.

scholarly journals Antifungal Efficacy of Plant Oils Containing Thymol and Carvacrol in Controlling Botrytis cinerea, the Causal Agent of Grape (Vitis vinifera) GrayMould

2018 ◽  
Vol 16 (02) ◽  
pp. 15-24
Author(s):  
Zaker M ◽  
Zaker L
Keyword(s):  
Essential Oils ◽  
Botrytis Cinerea ◽  
Spore Germination ◽  
Mycelial Growth ◽  
Germ Tube ◽  
Plant Diseases ◽  
Plant Oils ◽  
Horticultural Products ◽  
Antifungal Efficacy ◽  
Germ Tube Elongation

The efficacy of a large number of plant extracts and essential oils in controlling plant diseases has been proven worldwide. Botrytis cinerea has attacked a wide host range causing severe loss in the field and at storage. In this study the antifungal efficacy of essential oils of three medicinal plants namely wild marjoram (Zataria multifolia), wild savory (perennial) (Satureja mutica) and savory (annual) (Satureja hortensis) possessing these compounds at three concentrations: 50, 100 and 200 ppm were evaluated in controlling the mycelial growth, spore germination and germ tube elongation of B. cinerea. All treatments except savory (annual) essential oil at 50 ppm showed significant differences with the control in inhibiting the mycelial growth as well as spore germination and germ tube elongation of B. cinerea (p=0.01). It was also noted that wild marjoram at 100 ppm and wild savory (perennial) essential oils at 200 ppm could completely (100%) inhibit the growth of the fungus. Essential oils from wild marjoram and wild savory had higher antifungal activity than annual savory. Their suitable formulations could be prepared and used as safe alternatives for controlling moulds of horticultural products during storage. The Agriculturists 2018; 16(2) 15-24

scholarly journals In Vitro Effect of Local Anesthetics onCandida albicansGerm Tube Formation

1994 ◽  
Vol 1 (4) ◽  
pp. 193-197 ◽  
Author(s):  
Acácio Rodrigues ◽  
Cidália Pina Vaz ◽  
A. Freitas Fonseca ◽  
J. Martinez de Oliveira ◽  
Henrique Barros
Keyword(s):  
Germ Tube ◽  
Inhibitory Effect ◽  
Tube Formation ◽  
Vaginal Candidiasis ◽  
Sabouraud Agar ◽  
Colony Forming Units ◽  
Vitro Effect ◽  
Phosphate Buffered Saline ◽  
Dose Dependent

Objective:This study was planned to clarify the in vitro effect of lidocaine and bupivacaine on germ tube formation byCandida albicansisolates from cases of clinical vaginal candidiasis.Methods:FourteenC. albicansstrains (clinical vaginal isolates) were grown on Sabouraud agar for 24 h at 37℃ and tested as follows: 100 μl of a yeast suspension [105colony forming units (CFU)/ml of phosphate buffered saline (PBS)] was added to 500 μl of fresh human serum with lidocaine or bupivacaine (pure salts) in serial concentrations. The test was run in duplicate. Controls were prepared for each strain. After 4 h of incubation at 37℃, samples were taken from each vial and 200 yeasts were counted in a counting chamber. The pH of each suspension was measured.Results:The results are given as the mean of the 2 readings and are expressed as the percentage of blastoconidia with germ tubes/total blastoconidia.Conclusions:Our experiments show that both lidocaine and bupivacaine have a dose-dependent inhibitory effect, pH-independent, on germ tube formation byC. albicansand that both drugs seem to be promising in the treatment of genital candidiasis due to the combination of anesthetic and antifungal properties.

Sensitivity of spore germination and germ tube elongation of Saccharina japonica to metal exposure

Ecotoxicology ◽  
2011 ◽  
Vol 20 (8) ◽  
pp. 2056-2068 ◽  
Author(s):  
Taejun Han ◽  
Jeong-Ae Kong ◽  
Hee-Gyu Kang ◽  
Seon-Jin Kim ◽  
Gyo-Sun Jin ◽  
...  
Keyword(s):  
Spore Germination ◽  
Germ Tube ◽  
Saccharina Japonica ◽  
Metal Exposure ◽  
Germ Tube Elongation

Correlation between protonema morphogenesis and the development of the microtubule system in Funaria spore germination under normal conditions and at high auxin concentrations: an immunofluorescence study

1989 ◽  
Vol 67 (8) ◽  
pp. 2227-2234 ◽  
Author(s):  
N. Ljubešić ◽  
H. Quader ◽  
E. Schnepf
Keyword(s):  
Cell Division ◽  
Spore Germination ◽  
Germ Tube ◽  
Immunofluorescence Study ◽  
Cell Morphogenesis ◽  
Antimicrotubule Agents ◽  
High Concentrations ◽  
High Auxin

Ungerminated spores of Funaria do not contain distinct microtubules but show diffuse antitubulin antibody fluorescence. The microtubules arise when, 24–48 h after sowing, the spores are swollen and the first germ tube begins to protrude. Initially, diffuse fluorescence and microtubules are concentrated around the nucleus. Treatment with auxin at high concentrations (5 × 10−5 – 10−4 M) retards germination and cell division. Like antimicrotubule agents, such as colchicine and chloroisopropyl-N-phenylcarbamate, high auxin concentrations affect the formation of microtubules; either short, irregularly shaped microtubules and fluorescent spots arise, or there is no evidence of microtubules. The auxin effects on growth and microtubules can be reversed in less than 1 day. There is a correlation between the formation of the microtubule system and cell morphogenesis.

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