Heading date and resistance to septoria tritici blotch in wheat not genetically associated |
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Authors: | PF Arama JE Parlevliet CH van Silfhout |
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Institution: | (1) KARI-National Plant Breeding Research Centre, P.O. Njoro, Kenya;(2) Department of Plant Breeding, WAU, P.O. Box 386, 6709 DB Wageningen, The Netherlands;(3) DLO-Research Institute for Plant Protection (IPO-DLO), P.O. Box 9060, 6700 GW Wageningen, The Netherlands |
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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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | disease assessment maturity resistance Septoria tritici Triticum aestivum wheat |
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