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Breeding for scab resistance in wheat: Inheritance of resistance and possibilities for in vitro selection

By: Buerstmayr, H | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Dubin, H.J.|Gilchrist, L.|Reeves, J.|McNab, A [eds.] | Grausgruber, H [coaut.] | Lemmens, M [coaut.] | Ruckenbauer, P [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-94-2.Subject(s): Breeding methods | Disease resistance | Genetic inheritance | In vitro selection | Plant diseases | Selection | CIMMYT | Triticum | Plant breeding AGROVOCDDC classification: 632.4 Summary: Recent literature on the inheritance of scab resistance in wheat is reviewed and discussed in comparison with our results. Scab resistance in the widely used Chinese cultivar Sumai 3 and its relatives, as well as the Brazilian cultivar Frontana, appears to be governed by two to three genes with major effects. The chromosomal location of resistance genes is still somewhat obscure. Several research groups now work on the identification of molecular markers for scab resistance. This research will lead to an improved understanding of its inheritance, and open the way for marker assisted selection. An assay was developed using the toxic fusarium metabolite deoxynivalenol (DON), which inhibits eukaryotic protein synthesis, as a selection agent to predict fusarium head blight (FHB) resistance (FHBR) in wheat. Tolerance to DON was tested during wheat seed germination, a process requiring intensive protein synthesis. It was concluded that DON tolerance appears to be an important mechanism contributing to quantitative FHB in wheat. The role of DON as an aggressiveness factor is therefore expected to be minimal on highly toxin-tolerant cultivars. Because not all investigated wheat genotypes with a high FHBR had high DON tolerance, at least one other resistance mechanism must exist. With this assay, FHB resistant lines were successfully selected from the progeny of a cross with a parent possessing both good FHB resistance and good DON tolerance.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 632.4 DUB (Browse shelf) 1 Available I624324
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Recent literature on the inheritance of scab resistance in wheat is reviewed and discussed in comparison with our results. Scab resistance in the widely used Chinese cultivar Sumai 3 and its relatives, as well as the Brazilian cultivar Frontana, appears to be governed by two to three genes with major effects. The chromosomal location of resistance genes is still somewhat obscure. Several research groups now work on the identification of molecular markers for scab resistance. This research will lead to an improved understanding of its inheritance, and open the way for marker assisted selection. An assay was developed using the toxic fusarium metabolite deoxynivalenol (DON), which inhibits eukaryotic protein synthesis, as a selection agent to predict fusarium head blight (FHB) resistance (FHBR) in wheat. Tolerance to DON was tested during wheat seed germination, a process requiring intensive protein synthesis. It was concluded that DON tolerance appears to be an important mechanism contributing to quantitative FHB in wheat. The role of DON as an aggressiveness factor is therefore expected to be minimal on highly toxin-tolerant cultivars. Because not all investigated wheat genotypes with a high FHBR had high DON tolerance, at least one other resistance mechanism must exist. With this assay, FHB resistant lines were successfully selected from the progeny of a cross with a parent possessing both good FHB resistance and good DON tolerance.

English

9806|AGRIS 9802

Jose Juan Caballero

CIMMYT Publications Collection

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