Abstract
Seed samples of 32 ecotypes obtained from individual plants and 2 old cultivars of Kentucky bluegrass (Poa pratensis L.) were used in this study. They were selected from 1452 accessions from Polish Gene Bank, Plant Breeding and Acclimatization Institute - IHAR Radzików based on preliminary tests conducted in greenhouse and growing chamber. All of tested ecotypes were collected during 1979–1981 in Poland by expeditions organised by Polish Gene Bank, IHAR Radzików. Additionally nine cultivars and breeding lines were used as a controls: Limousine, Gol, Conni, BA 130, Barvictor, Bartitia, Parade, Chałupy, RAH 1474. Accessions used as control were chosen based on the results obtained in different trials conducted in Poland, Germany, France, The Netherlands and Great Britain.
All these 43 accessions of Kentucky bluegrass were tested for leaf spot and melting out resistance under field conditions during 3 years (1998–2000). These tests were conducted in three treatments: with inoculation by Drechslera poae (Baudys) Shoemaker, with natural infection of this fungus and with application of fungicide Tilt 250 EC. Based on results obtained during spring assessment of the disease severity it was possible to observe the effect of inoculation by D. poae. Resistance of inoculated and grown with natural infection ecotypes, cultivars and breeding lines was scored in average for 5.92 and 7.73, respectively. It was not possible to find significant differences in resistance during fall disease assessment. The repeatability of scores obtained during three years of the experiment was statistically significant. Additionally, results obtained for inoculated genotypes under field conditions significantly correlate with the results obtained during study conducted under greenhouse and growing chamber conditions. Nine ecotypes in the treatment with inoculation by D. poae were scored higher than 6.5 (on the level of the control cultivars: Conni, Gol, and Limousine). The value of newly identified sources of resistance to leaf spot and melting out in Kentucky bluegrass breeding programs was discussed.
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Czembor, E. Resistance of Kentucky bluegrass (Poa pratensis L.) ecotypes from Polish Gene Bank to melting out (Drechslera poae) under field conditions in 1998–2000. Genetic Resources and Crop Evolution 50, 747–756 (2003). https://doi.org/10.1023/A:1025031228486
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DOI: https://doi.org/10.1023/A:1025031228486