Role of Auto-inhibitors on Mycelial Growth and Dimorphism of Glomerella cingulata

Lingappa, B. T.; Lingappa, Yamuna

doi:10.1099/00221287-56-1-35

Cited by 29 publications

(14 citation statements)

References 9 publications

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“…Secondary spore formation occurs in Cephalosporium asteri (Dowson, 1923), Penicillium notatum (Hadley & Harrold, 1958), Alternaria spp. (Rotem & Bashi, 1969), Glomerella cingulata (Lingappa & Lingappa, 1969) and in Geotrichum candidum (Park & Robinson, 1969). This immediate sporulation with absence of or very limited vegetative development is not limited to fungal spores since a similar phenomenon termed ' microcycle sporogenesis ' has also been demonstrated in bacterial spores (Vintner & Slepecky, 1965 ;Slepecky, 1969).…”

Section: Discussionmentioning

confidence: 87%

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The Production of Conidiophores and Conidia by Newly Germinated Conidia of Aspergillus niger (Microcycle Conidiation)

Anderson

Smith

1971

Journal of General Microbiology

116

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S U M M A R YThe ability of Aspergillus niger conidia to produce conidiophores after germination in shaken culture at 30" was stimulated by the inclusion of glutamate in the medium. Incubation of the conidia at 35" to 41" increased swelling of the conidia and also the proportion which produced conidiophores. Although conidio phore initiation was stimulated at temperatures between 35" and 41 ", maturation was poor and optimum conidiation was obtained by incubation at these temperatures followed by 30". Conidiophore formation from conidia required a prior period of spore metabolism and at temperatures between 30" and 41 " did not occur until several hours after germination. Direct conidiophore production from conidia in the complete absence of vegetative growth was achieved by incubation of the conidia at 44" (which allows only swelling) for a prolonged period (48 h.) followed by 30". Although vegetative growth was absent the conidiophores were similar to, but smaller than, normal subaerial conidiophores and viable conidia were produced. These conidia differed from subaerial spores in lacking the dark pigmented spore coat.

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Section: Discussionmentioning

confidence: 87%

“…In some fungi germination can occur by budding, either by direct budding of the spore or by the formation of a tube and its subsequent budding (Wolf & Wolf, 1947;Bartnicki-Garcia, 1969;Lingappa & Lingappa, 1969).…”

Section: Discussionmentioning

confidence: 99%

The Production of Conidiophores and Conidia by Newly Germinated Conidia of Aspergillus niger (Microcycle Conidiation)

Anderson

Smith

1971

Journal of General Microbiology

116

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“…Uredospores do not germinate unless the self-inhibitor is removed by an aqueous wash, leading to the suggestion that this signal may decrease competition within the population by blocking germination until a spore has dispersed. In Glomerella cingulata cultures, a diffusible factor decreases mycelia formation with a concomitant increase in conidia formation at cell densities greater than 10 6 per ml (46). The chemical identity of the molecule has not been described.…”

Section: Other Fungal Autoregulatory Moleculesmentioning

confidence: 99%

Talking to Themselves: Autoregulation and Quorum Sensing in Fungi

2006

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Extracellular autoinducing compounds in the supernatants of microbial cultures were first recognized for their roles in the induction of genetic competence in gram-positive bacteria (17,94) and in the regulation of light production in marine vibrios (60). In 1994, this form of population-level regulation in microbes was dubbed "quorum sensing" since it enabled bacterial cells to chemically measure the density of the surrounding population (18). Subsequently, many examples of cell densitydependent regulation by extracellular factors have been found in diverse microorganisms. The widespread incidence of diverse quorum-sensing systems strongly suggests that regulation in accordance with cell density is important for the success of microbes in many environments (see references 25 and 95 for reviews).Cell density-dependent regulatory networks in microorganisms generally control processes that involve cell-cell interactions, such as group motility (10, 37) and the formation of multicellular structures (67,93,95). In a wide array of environmental and medically relevant bacteria, the development, maintenance, and dispersion of multicellular, surface-associated biofilms are in part controlled by quorum-sensing regulatory pathways (for reviews, see references 67 and 93). The uptake of extracellular DNA is often regulated in accordance with cell density presumably to enhance the chances of taking up DNA from closely related strains. For some bacteria, a link between the competence and biofilm formation has been established (69, 93). Both pathogens and symbionts that live in association with plant or animal hosts often use quorum sensing to regulate factors involved in microbe-host interactions (20,86,96). Quorum-sensing regulation may allow host-associated microbes to delay detection until an effective population has formed in the appropriate niche within the host.Recently, it has become apparent that fungi, like bacteria, also use quorum regulation to affect population-level behaviors such as biofilm formation and pathogenesis. Considering the extent to which quorum-sensing regulation controls important processes in many distantly related bacterial genera, it is not surprising that cell density-dependent regulation also appears to be prevalent in diverse fungal species. Because fungal quorum sensing has been most extensively studied in Candida albicans, a dimorphic opportunistic pathogen, the majority of this review focuses on the details of quorum-sensing regulation in this fungus. A discussion of other fungi that appear to use quorum-sensing regulation and the identities of other known fungal signaling molecules are presented, and potential connections between mating in fungi and cell density-dependent regulation are explored. The review will conclude with points relating to the ecology of quorum sensing and a discussion of quorum-sensing networks as potential targets for antifungal therapies.

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“…Apart from such exogenous agents, several fungi are found to produce regulatory compounds that affect their growth and differentiation (16)(17)(18)(19)(20)(21). LINGAPPA and LINGAPPA (22) also reported that upon addition of extracts of conidia of Glomerella cingulata its culture predominantly develops into the Y phase.…”

mentioning

confidence: 99%

Dimorphism in Candida Albicans. I. Morphology- Dependent Changes in Cellular Content of Macromolecules and Respiratory Activity

Yamaguchi

1974

J. Gen. Appl. Microbiol.

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Role of Auto-inhibitors on Mycelial Growth and Dimorphism of Glomerella cingulata

Cited by 29 publications

References 9 publications

The Production of Conidiophores and Conidia by Newly Germinated Conidia of Aspergillus niger (Microcycle Conidiation)

The Production of Conidiophores and Conidia by Newly Germinated Conidia of Aspergillus niger (Microcycle Conidiation)

Talking to Themselves: Autoregulation and Quorum Sensing in Fungi

Dimorphism in Candida Albicans. I. Morphology- Dependent Changes in Cellular Content of Macromolecules and Respiratory Activity

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