Patterns of sporulation in Trichoderma viride

Ellison, PJ; Harrower, K.M.; Chilvers, G. A.; Owens, J.D.

doi:10.1016/s0007-1536(81)80071-x

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…The nitrogen status of the environment has been demonstrated to cross-regulate photoconidiation (Ellison et al, 1981;Steyaert et al, 2010c). In the presence of preferred (primary) nitrogen sources, organisms repress expression of genes required for the utilization of secondary sources and this is referred to as nitrogen catabolite repression (NCR).…”

Section: Carbon and Nitrogen Statusmentioning

confidence: 99%

“…Under nitrogen deprivation, or when primary sources are low and secondary sources are high, derepression occurs. Out of 40 T. viride soil isolates, half sporulated at the periphery and did not produce concentric rings when grown on potato dextrose agar (PDA) under natural light, whereas repetition of the same experiments on richer media resulted in concentric circles (Ellison et al, 1981). By supplementing PDA with single nutrients present in the richer media, these authors demonstrated that addition of primary forms of nitrogen can convert a peripheral sporulator to a concentric one and concluded that the uptake of primary nitrogen in a cell must be sufficient to allow simultaneous growth and conidiation.…”

Section: Carbon and Nitrogen Statusmentioning

confidence: 99%

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Reproduction without sex: conidiation in the filamentous fungus Trichoderma

et al. 2010

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2Lincoln Ventures Limited, PO Box 133, Lincoln University, Lincoln 7647, New Zealand Trichoderma spp. have served as models for asexual reproduction in filamentous fungi for over 50 years. Physical stimuli, such as light exposure and mechanical injury to the mycelium, trigger conidiation; however, conidiogenesis itself is a holistic response determined by the cell's metabolic state, as influenced by the environment and endogenous biological rhythms. Key environmental parameters are the carbon and nitrogen status and the C : N ratio, the ambient pH and the level of calcium ions. Recent advances in our understanding of the molecular biology of this fungus have revealed a conserved mechanism of environmental perception through the White Collar orthologues BLR-1 and BLR-2. Also implicated in the molecular regulation are the PacC pathways and the conidial regulator VELVET. Signal transduction cascades which link environmental signals to physiological outputs have also been revealed.

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Section: Carbon and Nitrogen Statusmentioning

confidence: 99%

Section: Carbon and Nitrogen Statusmentioning

confidence: 99%

Reproduction without sex: conidiation in the filamentous fungus Trichoderma

et al. 2010

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“…For example, while conidiation in T. atroviride has been suggested to be primarily carbon-source dependent, the source of carbon cross-regulates photoconidiation by BLR-1/BLR-2 (Friedl et al 2008). The extent of lightinduced conidiation has also been suggested to be dependent upon the nitrogen status of the medium (Ellison et al 1981). Light exposure and the manipulation of carbon or nitrogen might be factors that could be exploited for controlled, precise induction of conidiation.…”

Section: Introductionmentioning

confidence: 99%

Isolate-specific conidiation in Trichoderma in response to different nitrogen sources

2010

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“…Amino-and ammoniumderived primary nitrogen sources are frequently used to induce NCR in filamentous fungi, and growth on KNO 3 or other nitrates strongly induces nitrogen derepression (Marzluf, 1997, ter Schure et al, 2000. By supplementing culture media with single nutri-ents present in the richer media, primary forms of nitrogen can convert a peripheral sporulation to a concentric one and the uptake of primary nitrogen in a cell must be sufficient to allow simultaneous growth and conidiation (Ellison et al, 1981).…”

Section: Resultsmentioning

confidence: 99%

“…Although, GABA serves as a good nitrogen source to many fungi, NH 4 NO 3 replacement by GABA in culture medium led to suppression of conidiation and formation of conidiation rings was inhibited in both parental strain and gad mutants (data not shown). The nitrogen status has been shown to cross-regulate conidiation (Ellison et al, 1981, Steyaert et al, 2010. In the presence of preferred (primary) nitrogen sources, organisms repress expression of genes required for the utilization of secondary sources and this process is termed Fig.…”

Section: Introductionmentioning

confidence: 99%

Disruption of GABA shunt affects Trichoderma atroviride response to nutritional and environmental stimuli

Nižnanský

Varečka

Kryštofová

2016

Acta Chimica Slovaca

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The fungus Trichoderma atroviride is a member of the genus Trichoderma to which belong many species known for high cellulase production, formation of various antibiotics, plant biocontrol and antagonistic activities against other fungi. Deletion of T. atroviride glutamate decarboxylase gene gad caused minor defects in germination, hyphal branching, slower growth and disruption of conidiation pattern. GABA can be used by fungi as a secondary carbon source and as a primary nitrogen source. We analyzed the effect of different nutrient compositions and environmental conditions (light and temperature) on growth and development of T. atroviride in strains defective in the functional GAD. The gad mutants grown on NH4NO3 as a sole carbon source grew slower and formed conidiation bands closer to each other which was clearly demonstrated during their cultivation in race tubes. The gad mutants exhibited slightly lower apical extension growth rate at the room temperature but their apical extension rate dropped significantly at 30 °C. Higher temperature had also inhibitory effect on gad mutant conidiation, whereas 30 °C seems optimal temperature for the parental strain. The optimal temperature for gad mutant conidiation was lower than in F534, about 25 °C.

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Patterns of sporulation in Trichoderma viride

Cited by 9 publications

References 4 publications

Reproduction without sex: conidiation in the filamentous fungus Trichoderma

Reproduction without sex: conidiation in the filamentous fungus Trichoderma

Isolate-specific conidiation in Trichoderma in response to different nitrogen sources

Disruption of GABA shunt affects Trichoderma atroviride response to nutritional and environmental stimuli

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