An endogenous rhythm of trap formation in the nematophagous fungus Arthrobotrys oligospora

Lysek, G.; Nordbring‐Hertz, Birgit

doi:10.1007/bf00384984

Cited by 24 publications

(10 citation statements)

References 10 publications

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“…We did not observe that the rhizosphere material on the sprinkled plates affected the number of trapping organs, but it appeared to have a positive influence on the formation of conidia which was frequent on and around the root pieces. An alternative developmental pattern of trap and conidia formation in nematode‐trapping fungi has been observed where the dominating structure depends on environmental conditions [32, 33].…”

Section: Discussionmentioning

confidence: 99%

Nematophagous fungi in the rhizosphere of agricultural crops

Persmark

Jansson

2006

FEMS Microbiology Ecology

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In a field experiment the rhizosphere effect of barley, pea and white mustard on the nematode‐trapping fungi were investigated throughout a growing season. The densities of nematode‐trapping fungi were slightly increased in the rhizospheres compared to the root‐free soil. Pea rhizosphere had the greatest numbers of species of nematophagous fungi with an average of 2.4 species recovered from 0.1 g material, and in white mustard and barley rhizospheres and root‐free soil less than 1.7 species were recovered from 0.1 g. Arthrobotrys oligospora was the most common species in both soil and rhizosphere. In a pot experiment the rhizosphere effect of pea and barley on nematophagous fungi was investigated in 5 different agricultural soils. Pea rhizosphere increased the densities of nematode‐trapping fungi, and up to 780 propagules of nematode‐trapping fungi g−1 rhizosphere soil were found, which was around 19 times higher than in the root‐free soil. The number of nematodes were 6–290 times higher in the pea rhizosphere than in the root‐free soil. Barley rhizosphere had little effect on the densities of nematode‐trapping fungi, while the number of nematodes increased by 3–13 times. The most commonly detected species were A. oligospora, Stylopage sp. and network‐forming Monacrosporium species, but there were no big differences in the species composition between the rhizosphere and the root‐free soil.

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Section: Discussionmentioning

confidence: 99%

Nematophagous fungi in the rhizosphere of agricultural crops

Persmark

Jansson

2006

FEMS Microbiology Ecology

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“…Albeit vague, the hypothesis is not incompatible with the idea of a closer connection among circadian rhythms, Rb* ions and membrane ATPases. The Rb* induced rhythmic conidiation in Neurospora crassa (Gall and Lysek 1981) and in Arthrobotrys oligospora (Lysek and Nordbring-Hertz 1981) as well as mycelial bending in Podospora anserina (Lysek and Schrilfer 1981) can point in the same direction.…”

Section: Discussionmentioning

confidence: 99%

Effects of alkali ions on the circadian leaf movements of Oxalis regnellii

Rinnan¹,

Johnsson²

1986

Physiologia Plantarum

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The influence of alkali ions on the circadian leaf movements of Oxalis regnellii Mig. was investigated. Ions were given to the oscillating system via the transpiration stream of cut stalks in nutrient medium. Chloride solutions of Rb+, Cs+, Na+ and K+ were tested and the results compared to previously published LiCl‐results. The period of the circadian leaf movements was unaffected by a continual addition of Na+ or K+ to the nutrient medium (at least up to 40 mM). Rb+, in the concentration of 2.5 or 5 mM, caused a shortening of the period when applied continuously. Rb+ concentrations up to 60 mM were tested. Cs+ ions caused only lengthenings of the circadian period. Cs+ concentrations up to 40 mM were tested. Cs+ resembled Li+ in producing period lengthenings, but was not as effective as Li+ when compared on a concentration basis. Toxicity of the effective ions was in the following order: Li+Cs+Rb+, Rb+ pulses (50 mM, 4 h) phase‐shifted the rhythm and caused advances. A phase response curve was determined and the maximum steady state advances were of the order of 1 h. The dual effect of the Rb+ ions is discussed and is assumed to be due to two counteracting processes, exemplified by Rb+‐sensitive ATPase‐controlled pumping processes and protein synthesis. For comparison, the effects of Rb+ and Li+ in human depressive disorders is also discussed in relation to their influence on circadian systems. It is emphasized that Rb+ and K+ behave differently and are not interchangeable in their action on circadian systems.

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“…109), Nectria cinnabarina (110), along with Penicillium spp, Alternaria tenuis , and a number of additional fungi (3, 111). There is even a rhythm in the formation of nematode traps by the nematophagous fungus Arthrobotrys oligospora (112). The first noncircadian rhythms in Neurospora crassa date from the 1960s (113), and more than three decades ago, the defining FLO rhythm was described in the frq -null strain frq 9 (114, 115).…”

Section: Noncircadian Oscillators In Fungimentioning

confidence: 99%

Making Time: Conservation of Biological Clocks from Fungi to Animals

2017

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SUMMARY The capacity for biological timekeeping arose at least three times through evolution, in prokaryotic cyanobacteria, in cells that evolved into higher plants, and within the group of organisms that eventually became the Fungi and the Animals. Neurospora is a tractable model system for understanding the molecular bases of circadian rhythms in the last of these groups, and is perhaps the most intensively studied circadian cell type. Rhythmic processes described in fungi include growth rate, stress responses, developmental capacity and sporulation as well as much of metabolism; fungi use clocks to anticipate daily environmental changes. A negative feedback loop comprises the core of the circadian system in fungi and animals. In Neurospora, the best studied fungal model, it is driven by two transcription factors, WC-1 and WC-2, that form the White Collar Complex (WCC). WCC elicits expression of the frq gene. FRQ complexes with other proteins, physically interacts with the WCC, and reduces its activity; the kinetics of these processes is strongly influenced by progressive phosphorylation of FRQ. When FRQ become sufficiently phosphorylated that it loses the ability to influence WCC activity the circadian cycle starts again. Environmental cycles of light and temperature influence frq and FRQ expression and thereby reset the internal circadian clocks. The molecular basis of circadian output is also becoming understood. Taken together, molecular explanations are emerging for all the canonical circadian properties, providing a molecular and regulatory framework that may be extended to many members of the Fungal and Animal kingdoms, including humans.

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An endogenous rhythm of trap formation in the nematophagous fungus Arthrobotrys oligospora

Cited by 24 publications

References 10 publications

Nematophagous fungi in the rhizosphere of agricultural crops

Nematophagous fungi in the rhizosphere of agricultural crops

Effects of alkali ions on the circadian leaf movements of Oxalis regnellii

Making Time: Conservation of Biological Clocks from Fungi to Animals

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