Locus of Blue and Near Ultraviolet Reversible Photoreaction in the Stages of Conidial Development in Botrytis cinerea

Suzuki, Yoshlhisa; Kumagai, Tadashi; Oda, Yasukage

doi:10.1099/00221287-98-1-199

Cited by 27 publications

(12 citation statements)

References 9 publications

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“…Nevertheless, exposure to blue light negatively affects conidia production while positively enhancing aerial (sterile) hyphae formation (Figure 1B, LD versus BL-D). This is in agreement with old reports describing the capacity of blue light to inhibit conidiation and to cause the “de-differentiation” of already developing conidiophore and sclerotial initials to sterile hyphae [69], [72], [75]. Therefore, while small dosages of white light suppress sclerotial development, it is blue but not the red fraction of the light spectra the one negatively affecting sclerotia formation (Figure 1B, YL-D and RL-D).…”

Section: Resultssupporting

confidence: 93%

Assessing the Effects of Light on Differentiation and Virulence of the Plant Pathogen Botrytis cinerea: Characterization of the White Collar Complex

et al. 2013

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Organisms are exposed to a tough environment, where acute daily challenges, like light, can strongly affect several aspects of an individual's physiology, including pathogenesis. While several fungal models have been widely employed to understand the physiological and molecular events associated with light perception, various other agricultural-relevant fungi still remain, in terms of their responsiveness to light, in the dark. The fungus Botrytis cinerea is an aggressive pathogen able to cause disease on a wide range of plant species. Natural B. cinerea isolates exhibit a high degree of diversity in their predominant mode of reproduction. Thus, the majority of naturally occurring strains are known to reproduce asexually via conidia and sclerotia, and sexually via apothecia. Studies from the 1970′s reported on specific developmental responses to treatments with near-UV, blue, red and far-red light. To unravel the signaling machinery triggering development – and possibly also connected with virulence – we initiated the functional characterization of the transcription factor/photoreceptor BcWCL1 and its partner BcWCL2, that form the White Collar Complex (WCC) in B. cinerea. Using mutants either abolished in or exhibiting enhanced WCC signaling (overexpression of both bcwcl1 and bcwcl2), we demonstrate that the WCC is an integral part of the mentioned machinery by mediating transcriptional responses to white light and the inhibition of conidiation in response to this stimulus. Furthermore, the WCC is required for coping with excessive light, oxidative stress and also to achieve full virulence. Although several transcriptional responses are abolished in the absence of bcwcl1, the expression of some genes is still light induced and a distinct conidiation pattern in response to daily light oscillations is enhanced, revealing a complex underlying photobiology. Though overlaps with well-studied fungal systems exist, the light-associated machinery of B. cinerea appears more complex than those of Neurospora crassa and Aspergillus nidulans.

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Section: Resultssupporting

confidence: 93%

Assessing the Effects of Light on Differentiation and Virulence of the Plant Pathogen Botrytis cinerea: Characterization of the White Collar Complex

et al. 2013

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“…tomato (Kumagai and Oda, 1969), A . cichorii (Vakalounakis and Christias, 1981) and Botrytis cinerea (Tan, 1974;Suzuki et al, 1977) is inhibited by blue light irradiation applied at a definite stage in conidiophore maturation during the 'terminal phase'. The inhibitory effect of blue irradiation can be counteracted by near-UV irradiation applied immediately after blue light.…”

Section: Introductionmentioning

confidence: 99%

TEMPERATURE AND MYCOCHROME SYSTEM IN NEAR‐UV LIGHT INDUCIBLE AND BLUE LIGHT REVERSIBLE PHOTOINDUCTION OF CONIDIATION IN Alternaria tomato*

Kumagai

1989

Photochem & Photobiology

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Abstract— When dark‐grown colonies were exposed to near‐UV light, conidiophore formation was induced, and conidia developed during a subsequent dark period. Simultaneous exposure to near‐UV and blue light inhibited induction of conidiation. The inductive effect of near‐UV light irradiation was greatly enhanced by treating colonies with low temperatures for 4 h during the 2nd‐6th hour of incubation in the dark following inductive irradiation: the enhancement was greatest at 21°C. The extent of inhibition by blue light increased with the temperature between 10 and 28°C. This diminution by low temperature was greatest when colonies previously kept at a low temperature were exposed to inductive irradiation: the longer the duration between inductive irradiation and temperature treatment, the lower the diminution. Higher fluences of blue light were required to suppress conidial induction at lower temperature. Thus, it is evident that the inductive effect of near‐UV light irradiation on conidiation and the suppressive effect of blue light irradiation are each responsive to different temperatures applied at different times.

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“…In many phytopathogenic species among the lower fungi, a similar light-temperature relationship controls the 'terminal phase' of conidia differentiation (Leach 1967(Leach , 1968. Other experiments on the abolishment by low temperature of the blue light inhibition of sporulation have also been reported (Cohen et aL 1975, Cohen 1976. Suzuki et aL 1977.…”

Section: Discussionmentioning

confidence: 70%

Light and Temperature Requirements during Fruit‐Body Development of a Basidiomycete Mushroom, Coprinus congregates

Robert

Durand

1979

Physiologia Plantarum

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Light initiated fruit body primordia of Coprinus congregatus Bull, ex Fr. grown at relatively high temperature (25°C) require a single dark period or low‐temperature induction for completion of fruit‐body development. The dark period requirement varied with the temperature regime during the inductive dark period A minimum requirement of 2.5 h was found al 15–20°C. Darkness always promotes development of fruit‐body primordial, but cannot, be regarded as an absolute necessity until temperature exceeds about 17.5°C. Normal development of me primordia without darkness was obtained by lowering the temperature to 10°C for 6 h. It appeared that at high temperatures two successive stimuli were required for basidiocarp maturation, a light‐off and a subsequent signal light‐on signal. On the contrary, at 10°C a single low‐temperature signal seemed to be involved. Thus, induction of fruit‐body development could be produced by alternative pathways. These developmental features have been extended to other fungi and compared with the flowering processes of some short‐day plants.

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Locus of Blue and Near Ultraviolet Reversible Photoreaction in the Stages of Conidial Development in Botrytis cinerea

Cited by 27 publications

References 9 publications

Assessing the Effects of Light on Differentiation and Virulence of the Plant Pathogen Botrytis cinerea: Characterization of the White Collar Complex

Assessing the Effects of Light on Differentiation and Virulence of the Plant Pathogen Botrytis cinerea: Characterization of the White Collar Complex

TEMPERATURE AND MYCOCHROME SYSTEM IN NEAR‐UV LIGHT INDUCIBLE AND BLUE LIGHT REVERSIBLE PHOTOINDUCTION OF CONIDIATION IN Alternaria tomato*

Light and Temperature Requirements during Fruit‐Body Development of a Basidiomycete Mushroom, Coprinus congregates

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