Transcription of the avirulence gene Avr9 of the fungal tomato pathogen Cladosporium fulvum is regulated by a GATA-type transcription factor in Aspergillus nidulans

1999 ◽  
Vol 261 (4-5) ◽  
pp. 653-659 ◽  
Author(s):  
S. S. Snoeijers ◽  
P. Vossen ◽  
T. Goosen ◽  
H. W. J. Van den Broek ◽  
P. J. G. M. De Wit
Keyword(s):  
Transcription Factor ◽  
Aspergillus Nidulans ◽  
Avirulence Gene ◽  
Cladosporium Fulvum ◽  
Tomato Pathogen

Nitrogen limitation induces expression of the avirulence gene avr9 in the tomato pathogen Cladosporium fulvum

1994 ◽  
Vol 243 (3) ◽  
pp. 277-285 ◽  
Author(s):  
G. F. J. M. Van den Ackerveken ◽  
R. M. Dunn ◽  
A. J. Cozijnsen ◽  
J. P. M. J. Vossen ◽  
H. W. J. Van den Broek ◽  
...  
Keyword(s):  
Nitrogen Limitation ◽  
Avirulence Gene ◽  
Cladosporium Fulvum ◽  
Tomato Pathogen

scholarly journals Additional Resistance Gene(s) Against Cladosporium fulvum Present on the Cf-9 Introgression Segment Are Associated with Strong PR Protein Accumulation

1998 ◽  
Vol 11 (4) ◽  
pp. 301-308 ◽  
Author(s):  
Richard Laugé ◽  
Alexander P. Dmitriev ◽  
Matthieu H. A. J. Joosten ◽  
Pierre J. G. M. De Wit
Keyword(s):  
Resistance Gene ◽  
Avirulence Gene ◽  
Fungal Mycelium ◽  
Protein Accumulation ◽  
Cladosporium Fulvum ◽  
Leaf Chlorosis ◽  
Tomato Pathogen ◽  
Or Genes ◽  
Introgression Segment ◽  
Weak Resistance

The existence of a gene or genes conferring weak resistance against the fungal tomato pathogen Cladosporium fulvum, in addition to the Cf-9 resistance gene, present on the Lycopersicon pimpinellifolium Cf-9 segment introgressed into L. esculentum, was demonstrated with strains of C. fulvum lacking a functional Avr9 avirulence gene and tomato genotypes lacking a functional Cf-9 gene, respectively. Two mutant strains, obtained by disruption of Avr9 in race 4 and race 5 of C. fulvum, do not trigger the hypersensitive response-mediated resistance on MM-Cf9 genotypes that is normally induced after recognition of the AVR9 elicitor. However, when these strains are inoculated onto MM-Cf0 and MM-Cf9 genotypes, adult MM-Cf9 plants still show weak resistance. This resistance is not related to the Cf-9 gene, as ethyl methanesulfonate (EMS)-generated Cf-9 mutants retained weak resistance. Growth of the fungus in the leaf mesophyll is strongly inhibited, whereas re-emergence of fungal mycelium and conidiation are poor. Strong accumulation of pathogenesis-related proteins and early leaf chlorosis are associated with this phenotype of weak resistance. A search among natural strains lacking the Avr9 gene revealed that one strain is able to overcome this weak resistance. Possible mechanisms underlying this weak resistance are discussed. The presence of the additional weak resistance gene(s) could explain why the resistance of Cf9 genotypes has not been overcome so far in practice.

scholarly journals HbxB Is a Key Regulator for Stress Response and β-Glucan Biogenesis in Aspergillus nidulans

2021 ◽  
Vol 9 (1) ◽  
pp. 144
Author(s):  
Sung-Hun Son ◽  
Mi-Kyung Lee ◽  
Ye-Eun Son ◽  
Hee-Soo Park
Keyword(s):  
Transcription Factor ◽  
Transcription Factors ◽  
Aspergillus Nidulans ◽  
Deletion Mutant ◽  
Phenotypic Analysis ◽  
Spore Viability ◽  
Fungal Development ◽  
Expression Of Genes ◽  
Trehalose Biosynthesis

Homeobox transcription factors are conserved in eukaryotes and act as multi-functional transcription factors in filamentous fungi. Previously, it was demonstrated that HbxB governs fungal development and spore viability in Aspergillus nidulans. Here, the role of HbxB in A. nidulans was further characterized. RNA-sequencing revealed that HbxB affects the transcriptomic levels of genes associated with trehalose biosynthesis and response to thermal, oxidative, and radiation stresses in asexual spores called conidia. A phenotypic analysis found that hbxB deletion mutant conidia were more sensitive to ultraviolet stress. The loss of hbxB increased the mRNA expression of genes associated with β-glucan degradation and decreased the amount of β-glucan in conidia. In addition, hbxB deletion affected the expression of the sterigmatocystin gene cluster and the amount of sterigmatocystin. Overall, these results indicated that HbxB is a key transcription factor regulating trehalose biosynthesis, stress tolerance, β-glucan degradation, and sterigmatocystin production in A.nidulans conidia.

scholarly journals Secondary Metabolism and Biotrophic Lifestyle in the Tomato Pathogen Cladosporium fulvum

PLoS ONE ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. e85877 ◽  
Author(s):  
Jérôme Collemare ◽  
Scott Griffiths ◽  
Yuichiro Iida ◽  
Mansoor Karimi Jashni ◽  
Evy Battaglia ◽  
...  
Keyword(s):  
Secondary Metabolism ◽  
Cladosporium Fulvum ◽  
Tomato Pathogen

The in-planta induced ecp2 gene of the tomato pathogen Cladosporium fulvum is not essential for pathogenicity

1994 ◽  
Vol 26 (3) ◽  
pp. 245-250 ◽  
Author(s):  
Roland Marmeisse ◽  
Guido F. J. M. Van den Ackerveken ◽  
Theo Goosen ◽  
Pierre J. G. M. De Wit ◽  
Henk W. J. Van den Broek
Keyword(s):  
Cladosporium Fulvum ◽  
In Planta ◽  
Tomato Pathogen
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