Schriften zu Genetischen Ressourcen - Genres

First results and discussion
H.M. RIEMER and E. SCHLIEPHAKE
A prototype of a data base system (http://www.genres.de/eva/) gives information
about the network, material tested, and methods. Summarised data of the first growing
cycle for spring barley and winter wheat are available for the partners.
Due to insufficient natural infestations, not all diseases could be scored. For spring
barley, Rhynchosporium secalis did not occur naturally. For winter wheat, the ear
diseases (Fusarium spp., Stagonospora nodorum) and Drechslera tritici-repentis
were scored only in the BAZ Institute. Insufficient natural infestation may be overcome
by more artificial infestation with pathogen race mixtures in the next cycle. Climatic
conditions differ between years and between environments – the multi-site
screening increases the probability for sufficient and valuable scorings.
Several breeders did not consider it necessary or possible to score more than the
usual one or two times, whereas this project requires three scoring times. On average,
three scorings were realised in 24% (winter wheat) and 65% (spring barley) of
the sites with occurrence of a disease. Some breeders were already satisfied with the
occurrence of some interesting genotypes, whereas others would prefer material with
several combined resistances or better agronomic value than was presented in the
set of the first year. For future screening, the number of partners has been augmented.
The authors expect the network system to become more efficient, when partners get
accustomed to the system and more motivated by having found interesting material.
References
MOLL, E. (1996): RESI. Assessing partial resistance in cereal cultivars. A SAS application.
Version 3.1. In: Reports from the Federal Biological Research Centre for
Agriculture and Forestry 374, 94-126.
WALTHER, U., K. FLATH, E. MOLL, J. PROCHNOW and E. SACHS (2000): Methodological
guidelines for the assessment of partial resistance in cultivars or lines with special
emphasis on epidemiological aspects. In: Reports from the Federal Biological
Research Centre for Agriculture and Forestry 374, 68-84.
EU Barley Project homepage: http://barley.ipk-gatersleben.de/
EVA project homepage: http://www.genres.de/eva/
313