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Seeds and database with FHB resistance data

We have characterized the FHB resistance of a wheat Screening Nursery with 126 genotypes from diverse sources (mainly winter wheat and some spring wheat genotypes) which were described as moderately to highly resistant against FHB (by own results, in the literature or by pers. comm.), together with a few susceptible checks and breeding lines of the participating breeding companies.

The material was evaluated for FHB resistance in well-replicated experiments during three seasons at five locations across Europe (in total 14 different year by location combinations). The lines were tested using artificial inoculations with local Fusarium strains and local methodology by spraying the Fusarium inoculum directly on the heads at anthesis or by the distribution of Fusarium plant debris on the soil surface. In this way this nursery of wheat lines was well characterized for FHB resistance in direct comparisons.

Severity was assessed. This disease parameter is a measure for the overall FHB resistance of the investigated lines. It is the result of a combination of Type I (resistance against penetration of the ear) and Type II resistance (resistance against colonization, i.e. growth of the fungus in the ear after infection took place). Incidence primarily reflects Type I resistance, whereas both spread and wilting measure Type II resistance. All data were analyzed and are available for further distribution. Highly significant differences between FHB resistance of the tested lines were detected. Type I and Type II resistance seems not to be coupled.

The data will be published. In addition, this set of genotypes (excluding the breeding lines) is made available to any interested breeding company also after the end of the project.

Moreover, the “most promising” lines are used by the participating private breeders immediately in their crossing programs as novel sources for FHB resistance. They can also be used by any third party. Also the resistance data of the individual lines are available freely.

This will not only allow any interested breeder to use the resistant lines for breeding, but also to improve the artificial inoculation techniques used. The resistance data obtained by any third party can be compared with the resistance data from our consortium. Our resistance data can be regarded as the true resistance level of these genotypes because of the intensive phenotyping we did.

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