Browsing by Subject "Vehnä"

Variety resistance in an economic means for the environment and the farmer to control pathogens that generally affect crops. In European spring wheat varieties, the resistance to leaf spot diseases has received less attention, especially with regard to significant parastagonospora nodorum blotch (also known as leaf and glume blotch) and tan spot in Finland. In this dissertation, new sources of disease resistance were sought from an extensive collection of spring wheat landraces. The resistance of four wheat gene bank material was screened and investigated against Finnish Parastagonospora nodorum and Pyrenophora tritici-repentis isolates. The study included three commonly grown spring wheat varieties to which the disease resistance of landraces was compared. The study was part of the Natural Resources Institute Finland’s (Luke) Hyötygeeni-project (Genetic Resources for Utilization - A Toolkit for Plant Breeding), which examined the pre-breeding chain as a part of the plant breeding process. Genotypes expressing a resistance to the leaf spot diseases were found from the studied spring wheat landraces. Landraces, which were found to be highly resistant to the wheat leaf spot diseases, was native to China and Sweden. Excellent durability to/for both parastagonospora nodorum blotch and tan spot was observed in Gotland single grain (ein korn) wheat (NGB 4497). The research for sources of disease resistance must be continued even more widely in landraces and wild species, and at the same time new forms and technologies of disease resistance screening must be developed. Ultimately, however, the aim is to ensure that yield levels and crop security remain good and to ensure research, breeding and production of domestic high-quality spring wheat in Finland.