Polyol accumulation by two filamentous fungi grown at different concentrations of NaCl

Adler, Lennart; Pedersen, Amelie; Tunblad-Johansson, Inga

doi:10.1111/j.1399-3054.1982.tb00315.x

Cited by 39 publications

(14 citation statements)

References 13 publications

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“…It has been reported that polyol accumulation correlates with resistance to stress caused by temperature, salinity, or drought in higher plants, salt stress in fungi, as well as heat, drought, or osmotic stress in bacteria and fungi (e.g. Smith et al 1983;Jennings and Burke 1990;Kelly and Budd 1991;Adler et al 1982;Guicherd et al 1997). Under the conditions investigated in this study, drought induced the accumulation of mannitol and arabitol, i.e.…”

Section: Discussionmentioning

confidence: 93%

The effect of drought on mycorrhizas of beech ( Fagus sylvatica L.): changes in community structure, and the content of carbohydrates and nitrogen storage bodies of the fungi

et al. 2002

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In a water-exclusion experiment, five different ecotypes of beech (Fagus sylvatica L.; representing regions of different environmental and climatic conditions in Baden-Württemberg, Germany) were subjected to drought conditions of different severity between July and September of two consecutive years. Drought stress as characterised by the water content and the pre-dawn water potential of the leaves was related to the degree of mycorrhization, the type of ectomycorrhiza, and the physiological properties of individual fungus/plant interactions at the fine roots of different beech ecotypes. Our data show that decreased soil water availability did not significantly change either the degree of fungal colonisation of beech roots (measured by the amount of ergosterol) or the number of ectomycorrhizal types per root system. Drought did, however, have an influence on the composition of the ectomycorrhizal community, and different mycorrhizal types responded to drought differently in terms of their patterns of occurrence/abundance. While the abundance of the dominant mycorrhizal types, formed with Byssocorticium atrovirens and Lactarius subdulcis, was not affected, drought increased the abundance of mycorrhiza formed between beech and Xerocomus chrysenteron. A detailed analysis of plant and fungal carbohydrates in mycorrhizas indicated that different drought intensities led to distinguishable responses. In plants exhibiting a pre-dawn water potential of down to -1.96 MPa, drought caused the accumulation of sucrose, glucose and fructose, and of fungus-specific compounds such as mannitol and arabitol in mycorrhizal roots at the expense of, e.g. trehalose. The accumulation of sugar alcohols, which constitute compatible solutes known to counteract drought stress, was species-specific. Mycorrhizas with X. chrysenteron formed large amounts of arabitol, while those with L. subdulcis accumulated mannitol. Sustained partitioning of carbon towards the mycorrhizal fungi under drought was also reflected by an increase of nitrogen storage in the fungal vacuoles. In treatments where the pre-dawn water potential reached values of as low as -2.4 MPa, such alterations were no longer found. In such plants, the starch and soluble sugars content was generally reduced, which also resulted in a lack of increase in protective, fungus-specific sugar alcohols. In summary, the data show that, within certain limits, an increase in drought causes a shift in plant/fungus communities. The shift in the pattern of fungus-specific compounds could possibly be used as a sensitive measure of physiological stress imposed on this symbiosis.

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Section: Discussionmentioning

confidence: 93%

The effect of drought on mycorrhizas of beech ( Fagus sylvatica L.): changes in community structure, and the content of carbohydrates and nitrogen storage bodies of the fungi

et al. 2002

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“…Adaptation to high salt concentration prevailing in OOMW coming from Morocco (around 40 g l -1 NaCl) (El Hadrami et al 2004)], could also constitute an important step of the acclimation mechanism. Salt stress tolerance involving intracellular accumulation of polyols is widespread among yeasts and fungi (Adler et al 1982;Blomberg and Adler 1993). A detoxification role for other systems like peroxisomes, present in several fungi and yeast species (Boisnard et al 2004;Horiguchi et al 2001), should be also interesting to evaluate if, as mentioned above, the metabolism of phenolic compounds generates ROS (Dias Selassie et al 1998).…”

Section: Resultsmentioning

confidence: 99%

Reduction of phenolics content and COD in olive oil mill wastewaters by indigenous yeasts and fungi

Aissam

Penninckx

Benlemlih

2007

World J Microbiol Biotechnol

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Olive oil mill wastewaters (OOMW) cause a recurrent environmental pollution problem. The large concentration of phenolic compounds in the organic fraction of OOMW is principally responsible for the phytotoxicity and microbial growth inhibitory effects of the effluent. Candida boidinii, Geotrichum candidum, a Penicillium sp. and Aspergillus niger HA37 were isolated from OOMW. When cultivated directly on an undiluted OOMW-based medium containing 82 g l -1 COD, these strains removed only 4-8% of chemical oxygen demand (COD) and phenolics. In contrast, reduction values attaining respectively 40-73% for phenolics and 45-78% for COD removal in the undiluted OOMW-based medium were obtained when using the strains gradually acclimated to high concentration of OOMW by successive stepwise transfer from media containing COD of 20.5 up to 82 g l -1 . Possibly, a sufficient production level of degradation and/or detoxification enzymes has to be attained to overcome the toxic effects of the phenolic fraction of concentrated OOMW. The present investigation calls attention to the necessity of acclimation for certain fungal and yeasts strains potentially useful for treating highly polluted effluents.

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“…It is already known [12] that during early germination of these spores the trehalase activity of these spores is activated several-fold by a cyclic AMP-dependent phosphorylation cascade. The production of glycerol has been associated with conditions of water stress in a variety of organisms such as algae [13], several yeasts [14,15] and filamentous fungi [16][17][18]. Therefore, the effect of osmotic stress on the production and leaking of glycerol from the germinating spores was also investigated.…”

Section: Introductionmentioning

confidence: 99%

Trehalose breakdown in germinating spores of Mucor rouxii

Laere

Slegers

1987

FEMS Microbiology Letters

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Germinating spores of Mucor rouxii rapidly broke down their large (23% of the dry weight) trehalose reserve. More than 50% of this trehalose was broken down to ethanol. About one‐third of the trehalose was converted to glycerol, which started to leak out of the spores after some 20 min germination. The synthesis of glycerol was not associated with any major change in glycerol 3‐phosphatase activity in the spores. Since its rate of leaking was much smaller and the internal concentration reached was much higher in spores subjected to osmotic stress, glycerol might play a role in the initial water uptake and swelling of the germinating spores.

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Polyol accumulation by two filamentous fungi grown at different concentrations of NaCl

Cited by 39 publications

References 13 publications

The effect of drought on mycorrhizas of beech ( Fagus sylvatica L.): changes in community structure, and the content of carbohydrates and nitrogen storage bodies of the fungi

The effect of drought on mycorrhizas of beech ( Fagus sylvatica L.): changes in community structure, and the content of carbohydrates and nitrogen storage bodies of the fungi

Reduction of phenolics content and COD in olive oil mill wastewaters by indigenous yeasts and fungi

Trehalose breakdown in germinating spores of Mucor rouxii

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