RESEAECH FOR RESISTANCE TO MICRODOCHIUM NIVALE AMONG INBRED LINES OF RYE

摘要

Three hundred twelve inbred lines originated from the hybrid breeding program and two open pollinated cultivars: Zduno and Wibro as a standard were screened for resistance to Micodochium nivale during five years at Radzikow. In each year about thirtyto hundred inbred lines were evaluated under controlled condition in the cold chamber and parallel in the field. Selected lines were repeated in series of testing in subsequent years. Twenty three lines were tested during three years, sixteen during fouryears and seven during five years. Significant variation was found for disease rating among investigated inbred lines. Majority of them were severe damaged by M. nivale in all tests. None of tested lines showed an immune reaction to infection. Relativelowest damage were observed in standard cultivars, but a few inbred lines in each test showed the plant loses on the standard cultivars level. Five the best lines selected in 3 year testing confirmed their value in 4 year testing as well. One line whichwas tested during 5 years showed its high resistance in all series. This results indicate that selection of inbred lines with higher level of resistance to M. nivale is possible by multiyear testing. A positive correlation was found between the disease index of genotypes in cold chamber test and in field test. The coefficients of correlation were much higher in two years of testing than in three other.