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Die Bodenkultur - Journal for Land Management, Food and Environment
J. H. Czembor and L. Frese:
Powdery mildew resistance in selections from barley landraces collected from Turkey
One hundred one accessions of barley landraces collected from Turkey were screened for resistance to powdery mildew. Landraces originated from the Federal Centre for Breeding, Research on Cultivated Plants (BAZ) Gene Bank, Braunschweig, Germany. Four tested landraces (4023, 4061, 4097 and 4124) showed resistance after inoculation with powdery mildew. From these landraces 9 single plant lines were selected. These lines were tested with 19 differential isolates of powdery mildew. The isolates were chosen according to their virulence spectra, which were observed on the 'Pallas' isolines differential set and 7 additional differential cultivars. These isolates represented collectively virulences to all major resistance genes used in the past and currently in Europe. Four lines derived from landrace 4124 (BGRC38917) showed resistance to all isolates used and represent highly effective source of resistance. Resistance of these lines is either Mlo or highly effective partial resistance that involve prevention of pathogen penetration. In remaining 5 lines, it was impossible to postulate which specific allele or alleles for resistance are present. Use of new sources of resistance (unknown genes, Mlo or partial resistance) from Turkish barley landraces for diversification of resistance genes for powdery mildew in barley varieties is discussed. Key words: Blumeria graminis (Erysiphe graminis), Hordeum vulgare.