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- Jansson, Hans-Börje, et al.
(författare)
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Growth and capture activities of nematophagous fungi in soil visualized by low temperature scanning electron microscopy
- 2000
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Ingår i: Mycologia. - 0027-5514. ; 92:1, s. 10-15
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Tidskriftsartikel (refereegranskat)abstract
- Growth and capture activities of nematophagous fungi in soil were observed using the low temperature scanning electron microscopy technique. The advantages of this sample preparation technique, compared with conventional scanning electron microscopy, are that it does not involve chemical fixation and dehydration of the sample and, therefore, gives a more accurate view of organ isms in soil. Growth, sporulation, trap formation, capture and digestion of nematodes were observed in soil using the nematode-trapping fungi Arthrobotrys superba, A. dactyloides and A. oligospora CT, and the endoparasite Drechmeria coniospora.
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- Persson, Britt C., et al.
(författare)
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The ms2io6A37 modification of tRNA in Salmonella typhimurium regulates growth on citric acid cycle intermediates
- 1998
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Ingår i: Journal of Bacteriology. - 0021-9193. ; 180:12, s. 3144-3151
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Tidskriftsartikel (refereegranskat)abstract
- The modified nucleoside 2-methylthio-N-6-isopentenyl adenosine (ms(2)i(6)A) is present in position 37 (adjacent to and 3' of the anticodon) of tRNAs that read codons beginning with U except tRNA(I,V)(Ser) in Escherichia coli, In Salmonella typhimurium , 2-methylthio-N-6-(cis-hydroxy)isopentenyl adenosine (ms(2)io(6)A; also referred to as 2-methylthio cis-ribozeatin) is found in tRNA, most likely in the species that have ms(2)i(6)A in E. coli. Mutants (miaE) of S. typhimurium in which ms(2)i(6)A hydroxylation is blocked are unable to grow aerobically on the dicarboxylic acids of the citric acid cycle. Such mutants have normal uptake of dicarboxylic acids and functional enzymes of the citric acid cycle and the aerobic respiratory chain. The ability of S. typhimurium Bo grow ore succinate, fumarate, and malate is dependent on the state of modification in position 37 of those tRNAs normally having ms(2)io(6)A37 and is not due to a second cellular function of tRNA (ms(2)io(6)A37)hydroxylase, the miaE gene product. We suggest that S. typhimurium senses the hydroxylation status of the isopentenyl group of the tRNA and will grow on succinate, fumarate, or malate only if the isopentenyl group is hydroxylated.
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- Persson, C, et al.
(författare)
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Growth of Arthrobotrys superba from a birch wood resource base into soil determined by radioactive tracing
- 2000
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Ingår i: FEMS Microbiology Ecology. - 1574-6941. ; 31:1, s. 47-51
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Tidskriftsartikel (refereegranskat)abstract
- The ability of a nematode-trapping fungus to establish in field soil is an important characteristic when considering its use as a biological control agent. The outgrowth of the nematode-trapping fungus Arthrobotrys superba from wood was recorded by labelling the fungus with [14C]3-O-methylglucose and [32P]orthophosphoric acid and by using the soil sprinkling method. The fungus reached a distance of 7–8 cm during 25 days in heat-treated (60°C) soil, detected by either radioactive tracing or the soil sprinkling technique. The two labelled compounds were co-distributed at all sampling times (r2=0.946) which indicates that the glucose pool (as methylglucose) and phosphorus content were correlated throughout the mycelium. In natural, non-heat-treated soil the fungus reached a distance of 1.5 cm from one disc of birch wood after 30 days, while it reached 3.2 cm during the same period when the food base was a pile of five inoculated discs. The experiments showed, for the first time, that a nematophagous fungus, A. superba, can grow out into soil from a piece of wood and supported by nutrients translocated from the resource base to the edge of the mycelium
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