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Means and variances for Fusarium head blight resistance of F2-derived bulks from winter triticale and winter wheat crosses

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Abstract

Fusarium head blight (FHB), caused by Fusarium graminearum and Fusarium culmorum, is a devastating disease in cereals. This study was undertaken to estimate progeny means and variances in each of five winter triticale and winter wheat crosses using unselected F2−derived lines in F4 or F5 generation bulked at harvest of the previous generation. Fifty (triticale) and 95 (wheat) progeny per cross were inoculated in two (triticale) or three (wheat) field environments. FHB rating was assessed on a whole-plot basis. Mean disease severities of the parents ranged from 2.3 to 6.4 in triticale and from 3.1 to 6.5 in wheat on a 1-to-9 scale (1 = symptomless, 9 = 100% infected). The midparent values generally resembled the means of their derived progeny. Significant (P < 0.01) genotypic variance was detected within each cross, but genotype × environment interaction and error variances were also high for both crops. Medium to high entry-mean heritabilities (0.6–0.8) underline the feasibility of selecting F2-derived bulks on a plot basis in several environments. Phenotypic correlation of FHB resistance between generation F2:4 and F2:5 was r = 0.87 (P < 0.01) tested across 150 wheat bulks at two locations. Our estimates of selection gain are encouraging for breeders to improve FHB resistance in triticale and wheat by recurrent selection within adapted materials.

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Acknowledgement

We thank Daniela Stoffel for successfully analysing one experiment of this study and Andrea Bosch for help in data collection.

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Authors and Affiliations

  1. State Plant Breeding Institute, University of Hohenheim, Fruwirthstr. 21, 70599, Stuttgart, Germany

    T. Miedaner, B. Schneider & G. Oettler

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  1. T. Miedaner
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  2. B. Schneider
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  3. G. Oettler
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Correspondence to T. Miedaner.

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Miedaner, T., Schneider, B. & Oettler, G. Means and variances for Fusarium head blight resistance of F2-derived bulks from winter triticale and winter wheat crosses. Euphytica 152, 405–411 (2006). https://doi.org/10.1007/s10681-006-9228-y

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  • DOI: https://doi.org/10.1007/s10681-006-9228-y

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