The APSES transcription factor LmStuA is required for sporulation, pathogenic development and effector gene expression in Leptosphaeria maculans - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Molecular Plant Pathology Année : 2015

The APSES transcription factor LmStuA is required for sporulation, pathogenic development and effector gene expression in Leptosphaeria maculans

Résumé

Leptosphaeria maculans causes stem canker of oilseed rape (Brassica napus). The APSES transcription factor StuA is a key developmental regulator of fungi, involved in morphogenesis, conidia production and also more recently described as required for secondary metabolite production and for effector gene expression in phytopathogenic fungi. We investigated the involvement of the orthologue of StuA in L.maculans, LmStuA, in morphogenesis, pathogenicity and effector gene expression. LmStuA is induced during mycelial growth and at 14 days after infection, corresponding to the development of pycnidia on oilseed rape leaves, consistent with the function of StuA described so far. We set up the functional characterization of LmStuA using an RNA interference approach. Silenced LmStuA transformants showed typical phenotypic defects of StuA mutants with altered growth in axenic culture and impaired conidia production and perithecia formation. Silencing of LmStuA abolished the pathogenicity of L.maculans on oilseed rape leaves and also resulted in a drastic decrease in expression of at least three effector genes during inplanta infection, suggesting either that LmStuA regulates, directly or indirectly, the expression of several effector genes in L.maculans or that the infection stage in which effectors are expressed is not reached when LmStuA expression is silenced.

Dates et versions

hal-01536499 , version 1 (11-06-2017)

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Jessica Louise Soyer, Audrey Hamiot, Benedicte Ollivier, Marie-Helene Balesdent, Thierry Rouxel, et al.. The APSES transcription factor LmStuA is required for sporulation, pathogenic development and effector gene expression in Leptosphaeria maculans. Molecular Plant Pathology, 2015, 16 (9), pp.1000-1005. ⟨10.1111/mpp.12249⟩. ⟨hal-01536499⟩
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