Colonial Growth of Fungi

Olsson, Stefan

doi:10.1007/978-3-662-06101-5_6

Cited by 24 publications

(29 citation statements)

References 72 publications

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“…Cellular vacuolization in vegetative mycelium during sporulation is well studied (Adams and Timberlake, 1990;Adams et al, 1998;Olsson, 2001) and is assumed to provide material to support conidiophore and conidiospore formation. There is good evidence that breakdown of material for reuse in other mycelial parts occurs within intact cell membranes (Lilly et al, 1991;Watkinson et al, 2001) and thus resembles apoptosis in animal cells (Olsson, 2001).…”

Section: Discussionmentioning

confidence: 98%

“…There is good evidence that breakdown of material for reuse in other mycelial parts occurs within intact cell membranes (Lilly et al, 1991;Watkinson et al, 2001) and thus resembles apoptosis in animal cells (Olsson, 2001). Searches for homologues of Fig.…”

Section: Discussionmentioning

confidence: 98%

“…PCD-like processes have been shown to be involved in tissue differentiation (Umar and Van Griensven, 1997) and the production of spores and resting structures (Georgiou, 1997). Such processes are energy expensive and the withdrawal of fungal biomass and reuse of nutrients in other parts of the mycelium could involve PCD to ensure survival of the organism (Olsson, 2001). The occurrence of PCD has thus been implicated in development of primordia of Agaricus bisporus (Umar and Van Griensven, 1997).…”

Section: Introductionmentioning

confidence: 98%

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Activation of caspase-like activity and poly (ADP-ribose) polymerase degradation during sporulation in Aspergillus nidulans

Thrane¹,

Kaufmann²,

Stummann³

et al. 2004

Fungal Genetics and Biology

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Activation of caspase-like activity and poly (ADP-ribose) polymerase degradation during sporulation in Aspergillus nidulans

Thrane¹,

Kaufmann²,

Stummann³

et al. 2004

Fungal Genetics and Biology

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“…While direct uptake and intra-hyphal nutrient diffusion may be sufficient to sustain short-range local growth when resources are abundant (Olsson 2001), longdistance translocation is required to deliver nutrients at a sufficient rate to growing tips, particularly in nonresource restricted fungi that are too large to distribute nutrients through diffusion alone (Eamus & Jennings 1984;Clipson et al 1987;Boswell et al 2002Boswell et al , 2003aBoswell et al ,b, 2007. Remarkably little is known about the mechanism(s) underpinning such long-distance nutrient translocation, or the quantitative contribution of different potential transport pathways, such as cytoplasmic streaming, vesicle transport or mass flow to net fluxes and overall nutrient dynamics (Jennings 1987;Cairney 1992;Fricker et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Growth-induced mass flows in fungal networks

et al. 2010

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Cord-forming fungi form extensive networks that continuously adapt to maintain an efficient transport system. As osmotically driven water uptake is often distal from the tips, and aqueous fluids are incompressible, we propose that growth induces mass flows across the mycelium, whether or not there are intrahyphal concentration gradients. We imaged the temporal evolution of networks formed by Phanerochaete velutina, and at each stage calculated the unique set of currents that account for the observed changes in cord volume, while minimizing the work required to overcome viscous drag. Predicted speeds were in reasonable agreement with experimental data, and the pressure gradients needed to produce these flows are small. Furthermore, cords that were predicted to carry fast-moving or large currents were significantly more likely to increase in size than cords with slow-moving or small currents. The incompressibility of the fluids within fungi means there is a rapid global response to local fluid movements. Hence velocity of fluid flow is a local signal that conveys quasi-global information about the role of a cord within the mycelium. We suggest that fluid incompressibility and the coupling of growth and mass flow are critical physical features that enable the development of efficient, adaptive biological transport networks.

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“…Classically, both effects are attributed asexual reproduction. Second, there is communication between the different parts of the mycelium, suggesting to interactions with other genes, environmental fluctuation, and epigenetic variation in gene expression that a thallus is a true organism (Olsson 2001). Although researchers studying filamentous fungi are (Griffiths et al 2000;Rakyan et al 2002).…”

mentioning

confidence: 99%

Incomplete Penetrance and Variable Expressivity of a Growth Defect as a Consequence of Knocking Out Two K+ Transporters in the Euascomycete Fungus Podospora anserina

Lalucque

Silar

2004

Genetics

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We describe an example of incomplete penetrance and variable expressivity in the filamentous fungus Podospora anserina, two genetic properties classically associated with mutations in more complex organisms, such as green plants and animals. We show that the knockouts of two TRK-related K ϩ transporters of this ascomycete present variability in their phenotype that cannot be attributed to fluctuations of the genetic background or the environment. Thalli of the knockout strains derived from independent monokaryotic ascospores or from a single monokaryotic ascospore and cultivated under standard growth conditions may or may not present impaired growth. When impaired, thalli exhibit a range of phenotypes. Environmental conditions control expressivity to a large extent and penetrance to a low extent. Restoration of functional potassium transport by heterologous expression of K ϩ transporters from Neurospora crassa abolishes or strongly diminishes the growth impairment. These data show that incomplete penetrance and variable expressivity can be an intrinsic property of a single Mendelian loss-of-function mutation. They also show that such variability in the expression of a mutant phenotype can be promoted by a phenomenon not obviously related to the well-known chromatin structure modifications, i.e., potassium transport. They provide a framework to understand human channelopathies with similar properties.

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Colonial Growth of Fungi

Cited by 24 publications

References 72 publications

Activation of caspase-like activity and poly (ADP-ribose) polymerase degradation during sporulation in Aspergillus nidulans

Activation of caspase-like activity and poly (ADP-ribose) polymerase degradation during sporulation in Aspergillus nidulans

Growth-induced mass flows in fungal networks

Incomplete Penetrance and Variable Expressivity of a Growth Defect as a Consequence of Knocking Out Two K+ Transporters in the Euascomycete Fungus Podospora anserina

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