Knowledge Center Catalog

The Septoria/Stagonospora blotch diseases of wheat: Past, present, and future

By: Contributor(s): Material type: TextTextPublication details: Mexico, DF (Mexico) CIMMYT : 1999ISBN:
  • 970-648-035-8
Subject(s): DDC classification:
  • 632.4 GIN
Summary: Septoria tritici and stagonospora nodorum blotch of wheat are regarded as major diseases because of their impact on crop management and wheat production. Both pathogens mainly affect the crop’s grain filling processes. Early research dealt mostly with genetic, cultural, and chemical control measures. Chemical control remains one of the major means of protecting wheat production, mostly through the use of new families of systemic fungicides. Emphasis has been given to epidemiological studies, in many cases associated with chemical control; however, in recent years epidemiological studies have expanded to include the effect of primary inoculum initiated from dispersal of ascospores of both pathogens. That shift in focus has introduced issues such as disease cycle, mating types, and their effect—together with pathogenicity—on each pathogen’s population structure. Recent findings attributed population structure to the pathogens’ sexual rather than asexual stage. The association between virulence spectrum and pathogenicity and the contribution of the sexual stage remains to be investigated. The impact of such studies on population structure may dictate adapting the proper breeding strategies. A population that is ever changing due to recombination and gene flow may influence the use of sources for specific resistance. As for the introduction of DNA technology into Septoria/Stagonospora: wheat so far has been able to identify population genetic trends in both pathogens, but they have yet to be linked to virulence patterns. The use of genetic transformation in both pathogens makes it possible to follow post-penetration processes by following reporter genes. This may reveal that synchronous events associated with the disease cycle, such as the building of fungal biomes and the initiation of picnidia formation, are all under the control of host-parasite interaction. Mutations in virulence genes facilitate studying their function and genome mapping. Concurrently resistance genes can be identified, studied, and mapped. This is an exciting era for Septoria tritici/Stagonospora nodorum x wheat interaction.
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Item type Current library Collection Call number Copy number Status Date due Barcode Item holds
Conference proceedings CIMMYT Knowledge Center: John Woolston Library CIMMYT Publications Collection 632.4 GIN (Browse shelf(Opens below)) 1 Available 1T628903
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Septoria tritici and stagonospora nodorum blotch of wheat are regarded as major diseases because of their impact on crop management and wheat production. Both pathogens mainly affect the crop’s grain filling processes. Early research dealt mostly with genetic, cultural, and chemical control measures. Chemical control remains one of the major means of protecting wheat production, mostly through the use of new families of systemic fungicides. Emphasis has been given to epidemiological studies, in many cases associated with chemical control; however, in recent years epidemiological studies have expanded to include the effect of primary inoculum initiated from dispersal of ascospores of both pathogens. That shift in focus has introduced issues such as disease cycle, mating types, and their effect—together with pathogenicity—on each pathogen’s population structure. Recent findings attributed population structure to the pathogens’ sexual rather than asexual stage. The association between virulence spectrum and pathogenicity and the contribution of the sexual stage remains to be investigated. The impact of such studies on population structure may dictate adapting the proper breeding strategies. A population that is ever changing due to recombination and gene flow may influence the use of sources for specific resistance. As for the introduction of DNA technology into Septoria/Stagonospora: wheat so far has been able to identify population genetic trends in both pathogens, but they have yet to be linked to virulence patterns. The use of genetic transformation in both pathogens makes it possible to follow post-penetration processes by following reporter genes. This may reveal that synchronous events associated with the disease cycle, such as the building of fungal biomes and the initiation of picnidia formation, are all under the control of host-parasite interaction. Mutations in virulence genes facilitate studying their function and genome mapping. Concurrently resistance genes can be identified, studied, and mapped. This is an exciting era for Septoria tritici/Stagonospora nodorum x wheat interaction.

English

9910|AGRIS 0001

Jose Juan Caballero

CIMMYT Publications Collection


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