Summary
Partial resistance to powdery mildew in spring barley was evaluated in three plot types: large isolation plots, in 1.4 m2 plots in chessboard design with guard plots of spring wheat and in single rows. Percentage leaf area covered by powdery mildew was scored four to six times during the season and partial resistance was characterized by the area under the disease progress curve. Varietal differences were revealed in al three plot designs, differences between the most resistant and susceptible genotypes being of a factor five. Differences between varieties decreased with decreasing plot size. The relationship between single scores of amount of powdery mildew on the upper four leaves and the area under the disease progress curve was high in all plot designs during the first two to three weeks after heading, allowing selection for the trait by one or two scorings. Differential ranking of varieties between different plot designs was observed, and is assumed to be due to increasing plot interference with reduced plot size and reduced distance between plots. A reliable selection for partial resistance could be made in large isolation plots and in 1.4 m2 plots, but hardly in single rows.
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References
Asher, M. J. C., 1982. The expression of partial resistance to powdery mildew in barley seedlings. Pp. 466–471, In: Barley genetics IV. Proceedings of the Fourth International Barley Genetics Symposium, Edinburgh 1981.
Asher, M. J. C. & C. E., Thomas, 1984. Components of partial resistance to Erysiphe graminis in spring barley. Plant Path. 33: 123–130.
Asher, M. J. C. W. T. B., Thomas & C. E., Thomas, 1983. The genetical control of incomplete forms of resistance to Erysiphe graminis in spring barley. Ann. appl. Biol. 103: 149–156.
Bainbridge, A. & J. F., Jenkyn, 1976. Mildew reinfection in adjacent and separated plots of sprayed barley. Ann. appl. Biol. 82: 477–484.
Bowen, K., P. S., Teng & A. P., Roelfs, 1984. Negative interplot interference in field experiments with leaf rust of wheat. Phytopath. 74: 1157–1161.
Giese, H., 1981. Powdery mildew resistance genes in the M1-a and M1-k regions on barley chromosome 5. Hereditas 95: 51–62.
James, W. C., C. S., Shih, L. C., Callbeck & W. A., Hodgson, 1973. Interplot interference in field experiments with late blight of potato (Phytophthora infestans). Phytopath. 63: 1269–1275.
Jenkyn, J. F. & A., Bainbridge, 1974. Disease gradients and small plot experiments on barley mildew. Ann. appl. Biol. 76: 269–279.
Jones, I. T. & J. D., Hayes, 1971. The effect of sowing date on adult plant resistance to Erysiphe graminis f.sp. avenae in oats. Ann. appl. Biol. 68: 31–39.
Jones, I. T., H. Sethar & I. J. E. R. Davies, 1982. Genetics of partial resistance to barley powdery mildew. pp. 449–457. In: Barley genetics IV. Proceedings of the Fourth International Barley Genetics Symposium, Edinburgh 1981.
Jørgensen, J. H. & H. P., Jensen, 1983. Powdery mildew resistance gene M1-a8 (Reglh8) in northwest European spring barley varieties. Barley Gen. Newsl. 13: 51–53.
Jørgensen, J. H. & J. Torp, 1978. The distribution of spring barley varieties with different powdery mildew resistances in Denmark from 1960 to 1976. Royal Vet.—& Agric. Univ. Copenhagen, Yearbook 1978: 27–44.
Kranz, J., 1983. Epidemiological parameters of plant resistance. pp. 141–162. In: Lamberti, J., M., Waller & N. A.van der, Graaf (Eds.), Durable resistance in crops. Plenum Press, New York.
Large, E. C. & D. A., Dooling, 1962. The measurement of cereal mildew and its effect on yield. Plant Path. 11: 47–57.
McKenzie, D. R. 1976. Application of two epidemiological models for the identification of slow stem rusting in wheat. Phytopath. 66: 55–59.
Moseman, J. G., 1968. Reactions of barley to Erysiphe graminis f.sp. hordei from North America, England, Ireland and Japan. Plant. Dis. Reptr. 52: 6.
Moseman, J. G., 1972. Isogenic barley lines for reaction to Erysiphe graminis f.sp. hordei. Crop. Sci. 12: 681–682.
Moseman, J. G. & G. W., Schaller, 1960. Genetics of the allelic series at the M1-a locus in barley and cultures of Erysiphe graminis f.sp. hordei that differentiate these alleles. Crop Sci. 50: 736–741.
Munk, L., 1984. Heterogene bygsorters indflydelse på meldugpopulationers sammensætning. Thesis, Royal Vet.-& Agric. Univ., Copenhagen. 93 pp.
Nazareno, N. R. & A. P., Roelfs, 1981. Adult plant resistance of Thatcher wheat to stem rust. Phytopath. 71: 181–185.
Nilsson, B. E., 1976. Undersökninger av ospecific mjöldaggsresistens hos korn. Thesis, Swedish Univ. Agric. Sci., 115 pp.
Parlevliet, J. E., 1981. Race-non-specific disease resistance. pp. 47–54. In: Jenkyn, J. F. & T. Plumb (Eds.). Strategies for the control of cereal disease. Blackwell Sci. Publ.
Parlevliet, J. E. & A.van, Ommeren, 1975. Partial resistance of barley to leaf rust, Puccinia hordei. II. Relationship between field trials, microplot tests and latent period. Euphytica 24: 293–303.
Rees, R. G., J. P., Thompson & R. J., Mayer, 1979. Slow rusting and tolerance to rusts in wheat. I. The progress and effects of epidemics of Puccinia graminis tritici in selected wheat cultivars. Aust. J. Agric. Res. 30: 403–419.
Rowell, J. B., 1982. Control of wheat stem rust by low receptivity to infection conditioned by a single dominant gene. Phytopath. 72: 297–299.
Shaner, G., 1973. Evaluation of slow-mildewing resistance of Knox wheat in the field. Phytopath. 63: 867–872.
Shaner, G. & R. E., Finney, 1977. The effect of nitrogen fertilization on the expression of slow mildewing resistance in Knox wheat. Phytopath. 67: 1051–1056.
Torp, J., H. P. Jensen & J. H. Jørgensen, 1978. Powdery mildew resistance genes in 106 north-west European spring barley varieties. Royal Vet.-& Agric. University, Copenhagen. Yearbook 1978: 75–102.
Umærus, W., 1970. Studies on field resistance to Phytopthora infestans. 5. Mechanisms of resistance and applications to potato breeding. Z. Pflanzenzücht. 63: 1–23.
Van der, Plank, J. E., 1963. Plant diseases: Epidemics and control. Academic Press. London.
Van der, Plank, J. E., 1968. Disease resistance in plants. Academic Press. London.
Wiberg, A., 1974. Sources of resistance to powdery mildew in barley. Hereditas 78: 1–40.
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Nørgaard Knudsen, J.C., Dalsgaard, H.H. & Helms, J. Field assessment of partial resistance to powdery mildew in spring barley. Euphytica 35, 233–243 (1986). https://doi.org/10.1007/BF00028562
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DOI: https://doi.org/10.1007/BF00028562