PHOTOMORPHOGENESIS IN Phycomyces and IN OTHER FUNGI

Corrochano, Luis M.; Olmedo, Enrique Cerdá

doi:10.1111/j.1751-1097.1991.tb02023.x

Cited by 28 publications

(8 citation statements)

References 66 publications

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“…That such dual blue-light photosystems do indeed exist was already indicated by the study of non-phototropic events in pea (Marrs and Kaufman, 1988). Two photosystems were also found for photomorphogenic events in Phycomyces, namely stimulation of macrophores and inhibition of microphores (Corrochano et al, 1988).…”

Section: Fluence-and Fluence Rate-response Curvesmentioning

confidence: 66%

PHOTOTROPISM OF THE Phycomyces SPORANGIOPHORE: A COMPARISON WITH HIGHER PLANTS

Galland

1990

Photochem & Photobiology

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Abstract-The basic phenomena of Phycomyces phototropism are described and compared with those of Avena and Zea coleoptiles and the seedlings of Arahidopsis, Cucumis, Helianthus, Raphanu and Sesamum. Symmetric redistribution of growth rate during curvature, a feature characteristic of Phycomyces phototropism, can in some cases also be found in plants. Common features are: complex fluence-response curves, log-linear Huence dependence of the phototropic latency, relatively slow biexponential dark-adaptation and fast light-adaptation kinetics, action spectra indicating the ubiquitous Havin-like photoreceptor(s) as well as other non-flavin receptors, and spacial memory as indicated by phototropic reversal experiments. The problem how phototropic curvature is maintained continuously while the light-growth response adapts, remains unexplained ("phototropism paradox"). For Phycomyces it is shown that some of the most basic information processes, which include contrast recognition, wavelength sensitivity and sensitivity recovery (sensor adaptation) are mediated by the photoreceptor systems.

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Section: Fluence-and Fluence Rate-response Curvesmentioning

confidence: 66%

PHOTOTROPISM OF THE Phycomyces SPORANGIOPHORE: A COMPARISON WITH HIGHER PLANTS

Galland

1990

Photochem & Photobiology

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“…Photocarotenogenesis does not occur during mycelial growth, but is restricted to a period of competence: the age at which the mycelium is reactive to the light stimulus. The period of competence for carotenoid accumulation and photophorogenesis roughly coincide under the same culture conditions (Corrochano & Cerdá-Olmedo, 1991).…”

Section: Introductionmentioning

confidence: 83%

Light-regulated asexual reproduction in Paecilomyces fumosoroseus

et al. 2004

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The entomopathogenic fungus Paecilomyces fumosoroseus has been successfully used in the control of several insect pests. Asexually produced spores (conidia) are the means for dispersal and transmission of the entomopathogen; upon contact with the insect cuticle they germinate and penetrate the host. In model fungal systems it has been found that phototropism, resetting of the circadian rhythm, the induction of carotenogenesis and the development of reproductive structures are controlled by blue light. The effect of light quality on conidial yield of P. fumosoroseus was investigated. Incubation in total darkness resulted in continued vegetative growth and lack of reproductive structures. In contrast, growth of the fungus in continuous illumination or under a night-day regime resulted in prolific formation of conidiophores bearing abundant mature conidia. Conidiation was photoinduced in competent mycelia by a single pulse of blue light and colonies were competent only after they had grown at least 72 h under total darkness. The fluence-response curves generated with blue light indicated that the minimal fluence required for the photomorphogenetic response was 180 mmol m "2 and the half-maximal response was at 400 mmol m "2. A fluence of 540 mmol m "2 was enough to saturate the system, inducing the maximum production of 2?12610 8 conidia per colony.Higher light intensities markedly decreased conidiation, suggesting the occurrence of a process of adaptation. The authors propose the existence of a dual light-perception system with at least two photoreceptors in P. fumosoroseus, one promoting and one inhibiting conidiation.

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“…Light governs many developmental transitions in the life cycles of fungi (Kumagai 1988;Corrochano and Cerda´-Olmedo 1991). The zygomycete Phycomyces blakesleeanus (Cerda´-Olmedo and Lipson 1987;Cerda´-Olmedo 2001) develops two types of fruiting bodies (sporangiophores) of very different size (macrophores and microphores) (Thornton 1972).…”

Section: Introductionmentioning

confidence: 99%

Photomorphogenesis in Phycomyces: differential display of gene expression by PCR with arbitrary primers

Corrochano

2002

Mol Gen Genomics

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The zygomycete fungus Phycomyces blakesleeanus develops two types of fruiting bodies of very different size, macrophores and microphores. Blue light stimulates macrophorogenesis and inhibits microphorogenesis. I have adapted a method based on the polymerase chain reaction with arbitrary primers to investigate the role of differential gene expression during photophorogenesis in Phycomyces. Several cDNAs for genes induced in vegetative mycelium have been observed, but only one gene induced by blue light has been detected. I have demonstrated the feasibility of this approach by the isolation of a cDNA segment for the heat-shock protein HSP100 that is induced by blue light at the onset of sporangiophore development. The heat-shock protein HSP100 is an ATP-binding protein that has the ability to disassemble protein complexes. In plants, the gene for HSP100 is induced by light. The cDNA segment for HSP100 obtained from Phycomyces is 686 bp long and the predicted amino acid sequence contains one of the ATP-binding sites.

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PHOTOMORPHOGENESIS IN Phycomyces and IN OTHER FUNGI

Cited by 28 publications

References 66 publications

PHOTOTROPISM OF THE Phycomyces SPORANGIOPHORE: A COMPARISON WITH HIGHER PLANTS

PHOTOTROPISM OF THE Phycomyces SPORANGIOPHORE: A COMPARISON WITH HIGHER PLANTS

Light-regulated asexual reproduction in Paecilomyces fumosoroseus

Photomorphogenesis in Phycomyces: differential display of gene expression by PCR with arbitrary primers

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