An approach to the study of moisture relations of soil fungi

Kouyeas, V.

doi:10.1007/bf01373825

Cited by 45 publications

(10 citation statements)

References 13 publications

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“…Polyols, particularly glycerol, have been shown to function as compatible solutes, being accumulated by yeasts such as Saccharomyces rouxii (Brown, 1978) and by filamentous fungi such as Penicillium chrysogenum and Chrysosporium firstidium (Luard, 1982), conferring protection to enzymes at low water potentials. Much narrower ranges for growth of C. globosum and T. viride (minima of -8.4 and -5.6 MPa respectively) were obtained on clean glass than were obtained in this study on 2% straw agar (Kouyeas, 1964). Nutrient status may influence the water potential range for growth (Griffin, 1972) and the latter medium is perhaps a more realistic in vitro substrate.…”

Section: Discussionmentioning

confidence: 55%

“…have the ability to degrade plant residues with a large cellulose/hemicellulose component (Chatterjee & Nandi, 198 1). They therefore may be important components of the microbial community colonizing cereal straw (Kouyeas, 1964). Garrett (1975) suggested that successful saprophytic colonization of straw by a fungal species is dependent on the growth rate (metabolic activity) and ability to degrade cellulose while others have suggested that pectinase and xylanase activity may be just as important (Boothby & Magreola, 1984).…”

Section: Discussionmentioning

confidence: 99%

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Water Potential, Growth and Cellulolysis of Fungi Involved in Decomposition of Cereal Residues

Magan¹,

Lynch²

1986

Microbiology

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1181The effect of water potential and temperature on growth and cellulolysis of 10 soil fungi which colonize cereal crop residues was determined in tlitro. On 2% (w/v) milled straw agar all species grew in the range -0.7 to -7-0 MPa at both 10 and 20 "C. Growth rates differed depending on the solute type used to control water potential. In general, but with the exception of the Penicillium spp., growth decreased with decreasing water potential. Hyphal growth on sterile straw internode segments was much less than that on 2% straw agar. Fusarium culmorum and Trichoderma harzianum colonized straw pieces best at high potential (-0.7 MPa) while only F. culmorum and the Penicillium spp. grew at low potential (-7.0 MPa). Trichoderma spp., Gliocladium spp. and Chaetomium globosum cleared cellulose agar most rapidly, depth of clearing decreasing with water potential in the range -0.7 to -2.8 MPa at 20 "C. The relationship between dry weight loss of inoculated cellulose filter paper and water potential was more variable.

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Section: Discussionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Water Potential, Growth and Cellulolysis of Fungi Involved in Decomposition of Cereal Residues

Magan¹,

Lynch²

1986

Microbiology

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“…3) between cycloheximide‐treated and ‐untreated samples. Second, survival of E. coli O157:H7 improves in compost models that have a lower moisture content than the one used here (data not shown), and lower moisture is expected to promote the growth of fungal species over protists (Kouyeas, 1964; Bardgett & Griffiths, 1997). The survival in low moisture was not improved by the addition of cycloheximide, suggesting that in dry environments, the protists play a less significant role in pathogen reduction (data not shown).…”

Section: Discussionmentioning

confidence: 82%

Influence of indigenous eukaryotic microbial communities on the reduction of Escherichia coli O157:H7 in compost slurry

Puri¹,

Dudley²

2010

FEMS Microbiology Letters

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Compost made from livestock manure is commonly used as a crop fertilizer and serves as a possible vehicle for the transmission of Escherichia coli O157:H7 to fresh produce. In this study, we hypothesized that the indigenous microbial communities present in composts adversely affects the survival of E. coli O157:H7. Escherichia coli O157:H7 was spiked into compost slurry and incubated at 25 °C. Escherichia coli O157:H7 exhibited a c. 4 log(10) reduction over 16 days. When compost was supplemented with the eukaryotic inhibitor cycloheximide, there was a minimal decrease in E. coli O157:H7 counts over the same time period. Analysis of microbial communities present in the compost with denaturing gradient gel electrophoresis (DGGE) suggested minor differences in the fungal communities present in cycloheximide-treated compost, compared with untreated compost over a period of 12 days at 25 °C. However, the DGGE profiles of protists showed drastic differences in community complexity. Clone library sequence analysis of protist populations revealed significantly different species composition between treatment and control samples at different time points. This suggests that predation of E. coli O157:H7 by protists might be a potential mechanism for reducing E. coli O157:H7 in compost materials.

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“… Qin et al, 2016 noted that fully-mulched planting pattern increased fungi population in potato continuous cropping field. Soil fungal populations are considered ‘xerophilous’ group with high moisture stress threshold values ( Kouyeas, 1964 ; Qiu et al, 2014 ). Another research reported that fungi and actinomycetes are favored by drier soil conditions than bacteria ( Stover, 1953 ).…”

Section: Discussionmentioning

confidence: 99%

Analysis on Fungal Diversity in Rhizosphere Soil of Continuous Cropping Potato Subjected to Different Furrow-Ridge Mulching Managements

Qin

Yeboah

et al. 2017

Front. Microbiol.

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Knowledge about fungi diversity following different planting patterns could improve our understanding of soil processes and thus help us to develop sustainable management strategies. The objective of this study was to determine the impact of different furrow-ridge mulching techniques on fungal diversity in rhizosphere soil under continuous cropping system. The investigated treatments were: flat plot without mulch (CK); flat plot with mulch (T1); on-ridge planting with full mulch (T2); on-furrow planting with full mulch (T3); on-ridge planting with half mulch (T4); and on-furrow planting with half mulch (T5). NGS (Illumina) methods and ITS1 sequences were used in monitoring fungi diversity of the potato rhizosphere soil. The fungi diversity in the rhizosphere soil was ranked in the order T5 > T2 > T4 > T1 > CK at the early growth stage and T2 > T3 > T1 > T4 > CK at the late growth stage of potato. The fungal communities found in the rhizosphere soil were Ascomycota, Zygomycota, Basidiomycota, Chytridiomycota, and other unidentified fungal communities. Among the fungal community in the rhizosphere soil, Ascomycota was found to be dominant fungi population, with the highest percentage (89%) in the T5 soil whereas the T2 soils had the lowest percentage (67%). The Fusarium abundance in fully-mulched treated soils was higher than in half-mulched treated soil. The dominant genus in the T4 soil was Mortierella, whereas lower populations (1–2%) of Scutellinia, Cryphonectria, Acremonium, and Alternaria were found in that treatment. Among the eumycetes, the dominant fungal class in all treated soils was the Sordariomycetes, which ranged from 57 to 85% in T2 and T5 soils, respectively. The Fusarium percentages in half-mulched treated soils (T4 and T5) were 55 and 28% lower than that of complete mulched treated soils (T2 and T3), respectively. The cluster analysis results showed that, CK, T4, and T5 treated soils and T1, T2, and T3 treated soils had similarities in microbial compositions, respectively. Potato tuber yield was greater under the on-ridge planting with full mulch (T2) treated soil, followed by on-ridge planting with half-mulch (T4) treated soil. The rhizosphere soil under the on-ridge planting with full-mulch (T2) soil had the highest fungal diversity, suggesting that this management was the best environment for fungi, whereas the on-ridge planting with half-mulch (T4) soil had the minimum abundance of Fusarium.

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An approach to the study of moisture relations of soil fungi

Cited by 45 publications

References 13 publications

Water Potential, Growth and Cellulolysis of Fungi Involved in Decomposition of Cereal Residues

Water Potential, Growth and Cellulolysis of Fungi Involved in Decomposition of Cereal Residues

Influence of indigenous eukaryotic microbial communities on the reduction of Escherichia coli O157:H7 in compost slurry

Analysis on Fungal Diversity in Rhizosphere Soil of Continuous Cropping Potato Subjected to Different Furrow-Ridge Mulching Managements

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