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Heading date and resistance to septoria tritici blotch in wheat not genetically associated

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Abstract

Nineteen cultivars, with large differences in heading date, were evaluated for their response to septoria tritici blotch in two experimental setups in Njoro, Kenya. Due to the more or less constant temperatures during the growing season and the overhead irrigation applied the epidemic conditions were similar over the whole observation period for the early and late cultivars. In experiment 1 the cultivars were assessed for disease severity at the same moment irrespective of the developmental stage, while in experiment 2 the cultivars were assessed at the same developmental stage. Measured at the same time, the disease severity was highest in the early maturing cultivars and lowest in the late maturing cultivars (r = –0.78). When assessed at the same development stage the disease build up was independent of heading date (r = –0.10) but strongly dependent on resistance level. There were no indications that early heading cultivars were more susceptible than late heading cultivars.

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Authors and Affiliations

  1. KARI-National Plant Breeding Research Centre, P.O. Njoro, Kenya

    P.F. Arama

  2. Department of Plant Breeding, WAU, P.O. Box 386, 6709 DB, Wageningen, The Netherlands

    J.E. Parlevliet

  3. DLO-Research Institute for Plant Protection (IPO-DLO), P.O. Box 9060, 6700 GW, Wageningen, The Netherlands

    C.H. van Silfhout

Authors
  1. P.F. Arama
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  2. J.E. Parlevliet
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  3. C.H. van Silfhout
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Arama, P., Parlevliet, J. & van Silfhout, C. Heading date and resistance to septoria tritici blotch in wheat not genetically associated. Euphytica 106, 63–68 (1999). https://doi.org/10.1023/A:1003593218761

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  • DOI: https://doi.org/10.1023/A:1003593218761

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