Disruption of the Cyanide Hydratase Gene in Gloeocercospora sorghi Increases Its Sensitivity to the Phytoanticipin Cyanide but Does Not Affect Its Pathogenicity on the Cyanogenic Plant Sorghum

The release of hydrogen cyanide (HCN) from preformed cyanogenic compounds in plants such as sorghum is thought to provide a protective barrier against infection by microorganisms. Gloeocercospora sorghi, a fungal pathogen of sorghum, produces the enzyme cyanide hydratase (CHT) which converts HCN to...

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Published inFungal genetics and biology Vol. 28; no. 2; pp. 126 - 134
Main Authors Wang, Ping, Sandrock, Robert W, VanEtten, Hans D
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 01.11.1999
Subjects
Ascomycota - drug effects
Ascomycota - enzymology
Ascomycota - genetics
Ascomycota - growth & development
Ascomycota - pathogenicity
Blotting, Western
CHT gene
cyanide detoxification
Gloeocercospora sorghi
Hydro-Lyases - genetics
Hydro-Lyases - metabolism
hydrogen cyanide
Hydrogen Cyanide - metabolism
pathogenicity
phytoanticipin cyanide
phytoanticipins
Plant Diseases - microbiology
Plasmids - genetics
Poaceae - metabolism
Poaceae - microbiology
Potassium Cyanide - pharmacology
sorghum
Sorghum vulgare
Transformation, Genetic
Virulence
pathogenicity
Gloeocercospora sorghi
sorghum
cyanide detoxification
phytoanticipins
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Abstract The release of hydrogen cyanide (HCN) from preformed cyanogenic compounds in plants such as sorghum is thought to provide a protective barrier against infection by microorganisms. Gloeocercospora sorghi, a fungal pathogen of sorghum, produces the enzyme cyanide hydratase (CHT) which converts HCN to the less toxic compound formamide. There is considerable prior evidence indicating that this mechanism for detoxifying HCN plays an important role in the pathogenicity of G. sorghi on sorghum. In the present study, the CHT gene was made nonfunctional in G. sorghi through transformation-mediated gene disruption. The transformant lacked CHT activity and no reacting polypeptides were detected with CHT-specific antibodies. This CHT mutant was highly sensitive to HCN, confirming that CHT is an HCN detoxifying mechanism, but it retained virulence on sorghum, causing lesions indistinguishable from those caused by the wild-type strain. This result indicates that G. sorghi does not require CHT for pathogenicity on cyanogenic lines of sorghum and suggests that cyanogenic compounds in plants may serve functions other than providing a mechanism of disease resistance.
AbstractList The release of hydrogen cyanide (HCN) from preformed cyanogenic compounds in plants such as sorghum is thought to provide a protective barrier against infection by microorganisms. Gloeocercospora sorghi, a fungal pathogen of sorghum, produces the enzyme cyanide hydratase (CHT) which converts HCN to the less toxic compound formamide. There is considerable prior evidence indicating that this mechanism for detoxifying HCN plays an important role in the pathogenicity of G. sorghi on sorghum. In the present study, the CHT gene was made nonfunctional in G. sorghi through transformation-mediated gene disruption. The transformant lacked CHT activity and no reacting polypeptides were detected with CHT-specific antibodies. This CHT mutant was highly sensitive to HCN, confirming that CHT is an HCN detoxifying mechanism, but it retained virulence on sorghum, causing lesions indistinguishable from those caused by the wild-type strain. This result indicates that G. sorghi does not require CHT for pathogenicity on cyanogenic lines of sorghum and suggests that cyanogenic compounds in plants may serve functions other than providing a mechanism of disease resistance.
Author VanEtten, Hans D
Sandrock, Robert W
Wang, Ping
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Keywords pathogenicity
Gloeocercospora sorghi
sorghum
cyanide detoxification
phytoanticipins
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Snippet The release of hydrogen cyanide (HCN) from preformed cyanogenic compounds in plants such as sorghum is thought to provide a protective barrier against...
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SubjectTerms Ascomycota - drug effects
Ascomycota - enzymology
Ascomycota - genetics
Ascomycota - growth & development
Ascomycota - pathogenicity
Blotting, Western
CHT gene
cyanide detoxification
Gloeocercospora sorghi
Hydro-Lyases - genetics
Hydro-Lyases - metabolism
hydrogen cyanide
Hydrogen Cyanide - metabolism
pathogenicity
phytoanticipin cyanide
phytoanticipins
Plant Diseases - microbiology
Plasmids - genetics
Poaceae - metabolism
Poaceae - microbiology
Potassium Cyanide - pharmacology
sorghum
Sorghum vulgare
Transformation, Genetic
Virulence
Title Disruption of the Cyanide Hydratase Gene in Gloeocercospora sorghi Increases Its Sensitivity to the Phytoanticipin Cyanide but Does Not Affect Its Pathogenicity on the Cyanogenic Plant Sorghum
URI https://dx.doi.org/10.1006/fgbi.1999.1167
https://www.ncbi.nlm.nih.gov/pubmed/10587474
https://search.proquest.com/docview/17419428
Volume 28
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