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Communication Dans Un Congrès Année : 2016

Sesquiterpenes in the Botrytis cinerea life cycle. Characterising the missing link in the ABA biosynthesis

Résumé

Botrytis cinerea is a well-known phytopathogenic fungus that infects more than two hundreds plants species. It shows a wide variety of mechanisms for infecting host plants, as for example the secretion of broad range of cell wall-degrading enzymes, toxins and many other secondary metabolites including i) non ribosomal peptides and amino acid-derived compounds, (ii) polyketides and fatty acid-derived compounds and (iii) terpenes. Botrytis produces three series of sesquiterpenes, botrydial (1) and its derivatives, a new family of eremophilenols (2) and the phytohormone abscisic acid (ABA) (3). Botrydial is one of the main toxins involved in the infection mechanism and its biosynthetic pathway has recently been completed. A sesquiterpene family with eremophilenol skeleton has been characterized and its role in the Botrytis cycle of life reported. The role of these sesquiterpenes in the interaction plant-pathogen will be discussed in this communication. On the other hand, studies on ABA biosynthesis had identified a gene cluster of at least four genes responsible for this pathway in B. cinerea. However, until now, the sesquiterpene cyclase (STC) involved in the ABA biosynthesis had not yet been identified and it should be located in another part of the genome of B. cinerea. The metabolomic study of the strains ATCC G3, an overproducer of ABA, its null mutants ΔBcSTC5 and mutants Δbcaba1-4, have allowed to identify the sesquiterpene cyclase involved in the ABA biosynthesis and to present an updated ABA biosynthetic pathway.
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Dates et versions

hal-01532617 , version 1 (02-06-2017)

Identifiants

  • HAL Id : hal-01532617 , version 1
  • PRODINRA : 381328

Citer

Isidro G Collado, Muriel Viaud. Sesquiterpenes in the Botrytis cinerea life cycle. Characterising the missing link in the ABA biosynthesis. XVII International Botrytis Symposium, Oct 2016, Santa Cruz, Chile. p.58. ⟨hal-01532617⟩
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