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Communication Dans Un Congrès Année : 2016

Looking through the eyes of Botrytis:Molecular genetics of photoperception and its consequences

Kim C. Cohrs
  • Fonction : Auteur
Muriel Viaud
Julia Schumacher

Résumé

Unlike plants that use light also as source of energy, filamentous fungi exclusively use light as signal; here, light may trigger morphogenesis, pigment formation and circadian rhythms. Light plays an important role in the biology of the gray mold fungus by determining the mode of asexual reproduction (conidia in the light, sclerotia in the dark) and by triggering the differentiation of the apothecia. Field populations of B. cinerea are highly diverse with regard to different phenotypic traits and can be generally divided into two groups; strains that undergo photomorphogenesis (considered as the initial situation) and strains that produce the same reproductive structures under different light conditions (considered as loss of light control). However, the inability to form certain reproductive structures such as conidia is expected to decrease the fitness of the pathogen, and thus, it is questionable why “blind” strains are abundant in field populations, especially as this phenotype may be associated with attenuated virulence as shown for the “always conidia” phenotype caused by SNPs in bcvel1. Therefore, we aim to understand the fundamental mechanisms of photoperception and the involved signal transduction pathways. Though overlaps with the well-studied fungal systems i.e. Neurospora crassa and Aspergillus nidulans exist, the light signaling machinery in B. cinerea appears more sophisticated. Thus, the fungus possesses more photoreceptors than saprophytic fungi and responds to different wavelengths of light (near-UV, blue, green, red, far-red). More than 200 genes are responsive to white light, including 24 transcription factor (TF)-encoding genes. BcLTF2 has an outstanding function as its expression is necessary and sufficient to induce conidiation and simultaneously to suppress sclerotial development. Its tight regulation by several signaling pathways governs the balance between vegetative growth that allows for the colonization of the substrate and entering sclerotial development, and reproduction via conidia in the light.
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Dates et versions

hal-01532612 , version 1 (02-06-2017)

Identifiants

  • HAL Id : hal-01532612 , version 1
  • PRODINRA : 381242

Citer

Kim C. Cohrs, Adeline Simon, Muriel Viaud, Julia Schumacher. Looking through the eyes of Botrytis:Molecular genetics of photoperception and its consequences. XVII International Botrytis Symposium, Oct 2016, Santa Cruz, Chile. p.22. ⟨hal-01532612⟩
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