Effect of CO2 on the germination of conidiospores of Aspergillus niger

Vakil, J.R.; Rao, M. R. Raghavendra; Bhattacharyya, P.

doi:10.1007/bf00406527

Cited by 20 publications

(4 citation statements)

References 6 publications

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“…Low concentrations of carbon dioxide have been shown to stimulate the germination of fungal spores (Yaganita, 1957;Farkas & Ledingham, 1959;Vakil, Raghavendra Rao & Bhattacharyya, 1961) which supports the view (Lawrence, 1965 a) that compounds capable of stimulating the oxidation of fatty acids by spores are also likely to stimulate the germination of non-activated spores.…”

Section: R C Lawrencementioning

confidence: 80%

The Oxidation of Fatty Acids by Spores of Penicillium roqueforti

Lawrence¹

1966

Journal of General Microbiology

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SUMlMARYThe ability of washed spores of Penicillium roqueforti to oxidize fatty acids decreased markedly with age but was restored by adding specific sugars and amino acids. Only the C, to C,, fatty acids were oxidized to the corresponding methyl ketone with one less carbon atom. The yield of methyl ketone between pH 5.5 and 7.0 decreased progressively from a maximum of 75 yo from octanoic acid to zero from myristic acid. The small amounts of metabolic carbon dioxide evolved greatly stimulated the oxidation of C,, and C,, fatty acids. The addition of sodium azide, 2,4-dinitrophenol (DNP) and certain divalent metallic ions, but not chloramphenicol, inhibited the oxidation of fatty acids. Oxidation was preceded by a lag period which was lengthened by increasing the fatty acid concentration or by decreasing the concentration of spores. Since cell-free extracts of spores were able to oxidize fatty acids, the lag phase with whole spores appears to be due to the absence of active transport systems. This is also indicated by the elimination of the lag phase by pre-incubation with octanoic acid but not by pre-incubation with glucose or casamino acids. The possible significance of methyl ketone formation in fatty acid metabolism is discussed.

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Section: R C Lawrencementioning

confidence: 80%

The Oxidation of Fatty Acids by Spores of Penicillium roqueforti

Lawrence¹

1966

Journal of General Microbiology

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“…As early as 1961, Vakil et al demonstrated that the optimum CO 2 concentration for the germination of Aspergillus niger conidiospores is reached not under normal atmospheric concentrations of CO 2 (0.033%) but at 0.5% [80]. Since then several additional phenotypes in fungi have been attributed to changes in the concentration of environmental CO 2 including the sporulation of Alternaria crassa and Alternaria cassiae [81], conidiation of Neurospora crassa [82], or capsule formation and mating in C. neoformans [83, 84].…”

Section: Volatile Compounds and Gasmentioning

confidence: 99%

Communication in Fungi

Cottier

Mühlschlegel

2012

International Journal of Microbiology

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We will discuss fungal communication in the context of fundamental biological functions including mating, growth, morphogenesis, and the regulation of fungal virulence determinants. We will address intraspecies but also interkingdom signaling by systematically discussing the sender of the message, the molecular message, and receiver. Analyzing communication shows the close coevolution of fungi with organisms present in their environment giving insights into multispecies communication. A better understanding of the molecular mechanisms underlying microbial communication will promote our understanding of the “fungal communicome.”

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“…Lawrence (1966), on the other hand, reported that the formation of methyl ketones from fatty acids by the spores of P. roqueforti increased considerably in the presence of metabolic CO2. Low concentrations of carbon dioxide have been reported to stimulate the germination of fungal spores (Cochrane et al, 1963;Farkas and Ledingham, 1959;Golding, 1940;Grover, 1964;Vakil et al, 1961;Yanagita, 1957). Thaler and Geist (1939) and Franke and Heinen (1958) reported that a decline in the formation of methyl ketones occurred when the spores of fungi germinate into the mycelium.…”

Section: L-prolinementioning

confidence: 99%

Oxidation of sodium palmitate-U-carbon-14 into carbonyl compounds by Penicillium roqueforti spores

Dartey¹,

Kinsella²

1973

J. Agric. Food Chem.

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Spore suspensions of P. roqueforti metabolized sodium palmitate into carbon dioxide and a variety of carbonyl compounds, including a homologous series of methyl ketones. Both D-glucose and L-proline suppressed the catabolism of palmitate to COS but stimulated the rate of formation of carbonyl compounds, including methyl ketones. Spore concentrations of 6.3 X lo8 spores/ml produced the optimum yield of (32.4%) carbonyl compounds from the incubation of 5 m M of palmitate in the presence of 20 m M of D-glucose under optimum conditions of pH and tempera-ture; i,e., pH 6.5 (0.1 M phosphate buffer) and 30". Analyses of carbonyl compounds formed from [U-14C]palmitate revealed that a homologous series of labeled methyl ketones, C3 to C15 inclusive, was produced. Pentadecanone contained the highest radioactivity, followed by tridecanone and undecanone, with the lower methyl ketones containing varying amounts of radioactivity. Appreciable amounts of carbonyl compounds other than methyl ketones (Le., labeled, saturated, and unsaturated aldehydes) were also produced from [14C]palmitic acid.

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Effect of CO2 on the germination of conidiospores of Aspergillus niger

Cited by 20 publications

References 6 publications

The Oxidation of Fatty Acids by Spores of Penicillium roqueforti

The Oxidation of Fatty Acids by Spores of Penicillium roqueforti

Communication in Fungi

Oxidation of sodium palmitate-U-carbon-14 into carbonyl compounds by Penicillium roqueforti spores

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