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Toxin of Pyrenophora tritici-repentis: host-specificity, significance in disease, and inheritance of host reaction

By: Lamari, L.
Contributor(s): Bernier, C.C [coaut.].
Material type: materialTypeLabelArticlePublisher: 1989ISSN: 0031-949X.Subject(s): America | Biological competition | Biological properties | Canada | Fungi | Glumiflorae | Gramineae | Injurious factors | Methods | Microbial properties | Monocotyledons | North America | Plant diseases | Plant genetics and breeding | Plants | Toxic substances | Genetics AGROVOCDDC classification: 90-024867 In: Phytopathology v. 79, no. 7, p. 740-744Summary: Pyrenophora tritici-repentis differentially induces combinations of tan necrosis and extensive chlorosis in individual susceptible wheat cultivars. Crude and dialyzed culture filtrates from isolates of P. tritici-repentis contained a heat-labile (121 C for 20 min) toxin(s), which induced necrosis only on fungus-susceptible, tan necrosis-expressing cultivars within the genus Triticum. Cultivars resistant to the fungus as well as cultivars susceptible to extensive chlorosis-inducing isolates were insensitive. Segregation of F2 populations from four different crosses between cultivars resistant and susceptible to tan necrosis indicated that susceptibility to the fungus and sensitivity to the toxin were controlled by the same dominant gene. Toxin production by the pathogen was associated with the ability of individual isolates to induce tan necrosis (nec+) in necrosis-expressing cultivars. Isolates that induced extensive chlorosis but not necrosis (nec- chl+) did not produce toxin in vitro. The toxin differentiated two near-isogenic lines from the cultivar Columbus. When inoculated with a nec+ isolate, only the toxin-sensitive line (Col+) developed tan necrosis. The toxin(s) of P. tritici-repentis is cultivar-specific, involved in the induction of necrosis in the host, and appears to be a pathogenicity factor. Its designation as Ptr necrosis toxin is proposedCollection: AGRIS Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

AGRIS Collection 90-024867 (Browse shelf) Available
Total holds: 0

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Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0031-949X

Pyrenophora tritici-repentis differentially induces combinations of tan necrosis and extensive chlorosis in individual susceptible wheat cultivars. Crude and dialyzed culture filtrates from isolates of P. tritici-repentis contained a heat-labile (121 C for 20 min) toxin(s), which induced necrosis only on fungus-susceptible, tan necrosis-expressing cultivars within the genus Triticum. Cultivars resistant to the fungus as well as cultivars susceptible to extensive chlorosis-inducing isolates were insensitive. Segregation of F2 populations from four different crosses between cultivars resistant and susceptible to tan necrosis indicated that susceptibility to the fungus and sensitivity to the toxin were controlled by the same dominant gene. Toxin production by the pathogen was associated with the ability of individual isolates to induce tan necrosis (nec+) in necrosis-expressing cultivars. Isolates that induced extensive chlorosis but not necrosis (nec- chl+) did not produce toxin in vitro. The toxin differentiated two near-isogenic lines from the cultivar Columbus. When inoculated with a nec+ isolate, only the toxin-sensitive line (Col+) developed tan necrosis. The toxin(s) of P. tritici-repentis is cultivar-specific, involved in the induction of necrosis in the host, and appears to be a pathogenicity factor. Its designation as Ptr necrosis toxin is proposed

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