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The use of antibiotics is not permitted in Switzerland; moreover, no other medication exists to combat European foul brood. Hives with symptoms must therefore be destroyed in order to limit the outbreak, and the contaminated material must be sanitised. Since prevention is the best cure, early detection is desirable. Numerous studies have been undertaken and documents have been created at the Swiss Bee Research Centre and elsewhere to draw the attention of beekeepers to these problems and inform them about the causes and the control measures to be implemented.

Merkblatt zur erkennung von Bienenbrutkrankheiten (German (PDF, 357 kB, 18.10.2017) and French (PDF, 226 kB, 02.02.2017))
M. Tschumi (2011)

Pyramiding of transgenic immune receptors from primary and tertiary wheat gene pools improves powdery mildew resistance in the field.

Institutional Repository Agroscope

Koller T., Camenzind M., Jung E., Brunner S., Herren G., Armbruster C., Keller B.

Pyramiding of transgenic immune receptors from primary and tertiary wheat gene pools improves powdery mildew resistance in the field.

Journal of Experimental Botany, 75, (7), 2024, 1872-1886.

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Abstract:

Introgression of resistance genes from wild or related species is a common strategy to improve disease resistance of wheat cultivars. Pm17 is a gene that confers powdery mildew resistance in wheat. It encodes an NLR type of immune receptor and was introgressed from rye to wheat as part of the 1RS chromosome arm translocation several decades ago. So far it was not possible to separate Pm17 from its co-introgressed rye genes due to suppressed recombination. Here we tested transgenic Bobwhite wheat, overexpressing Pm17 without any other rye genes, in the field. Four transgenic events showed high levels of PM17 protein accumulation, strong powdery mildew resistance and no pleiotropic effects during three field seasons. We used a combined approach of transgene insertion and crossbreeding to generate lines co-expressing Pm17 and Pm3, or Pm17 and Pm8, respectively. Blumeria graminis f.sp. tritici infection tests confirmed additive, race-specific resistance of the two pyramided transgenes in lines Pm17+Pm3b and Pm17+Pm8. Furthermore, pyramided lines showed strong powdery mildew resistance during three field seasons. We conclude that the combination of overexpressed NLR genes from the extended gene pool broadens and diversifies wheat disease resistance.

ISSN Print: 0022-0957
ISSN Online: 1460-2431
Digital Object Identifier (DOI): https://doi.org/10.1093/jxb/erad493
Publication-ID (Web Code): 55371 Sending by e-mail

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Pyramiding of transgenic immune receptors from primary and tertiary wheat gene pools improves powdery mildew resistance in the field.