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Diallel analysis of resistance to head blight caused by Fusarium culmorum in winter wheat

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Summary

Ten homozygous winter wheat genotypes representing different levels of resistance to Fusarium head blight were crossed in all possible combinations excluding reciprocals. Parents, F1 and F2 were inoculated with one pathogenic strain of Fusarium culmorum. Data for head blight, observed 21 days after first inoculation (OBS-2), and for the area under the disease progress curve, based on observations 14, 21 and 28 days after first inoculation (AUDPC), were analyzed. The contrast between parents and F1 crosses indicated dommance effects of the resistance genes. Diallel analysis according to Griffing's Method 4, Model 1 showed significant general combining ability (GCA) effects for both F1 and F2; specific combining ability effects were not significant. With the exception of one genotype for which general performance for Fusarium resistance was not in agreement with its GCA, the resistance to F. culmorum was uniformly transmitted to all offspring, and the parents can be described in terms of GCA. It is suggested that in the progenies with one of the awned lines as parent, one resistance gene was linked with the gene coding for presence of awns, located on chromosome 4B. A single observation date, taken at the right time, was as effective in assessing resistance as the AUDPC.

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  1. Centre for Plant Breeding Research (CPO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands

    C.H.A. Snijders

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Snijders, C. Diallel analysis of resistance to head blight caused by Fusarium culmorum in winter wheat. Euphytica 50, 1–9 (1990). https://doi.org/10.1007/BF00023154

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  • DOI: https://doi.org/10.1007/BF00023154

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