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Diallel analysis of net blotch resistance in doubled haploid lines of Nordic spring barleys

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Abstract

A half-diallel was made between five six-rowed Nordic spring barleys to study the genetics of resistance to net blotch. Twenty-five doubled-haploid (DH) lines from each cross and the parents were sown in hill plots in Finland in 1997 and 1998. The plots were artificially inoculated with Pyrenophora teres Drechs. f. teres Smedeg. and assessed for resistance to net blotch. There were statistically significant differences in resistance of the five parents to net blotch. General combining ability (GCA) of the parents and specific combining ability (SCA) effects in the progeny were statistically significant in both years, but GCA effects predominated. Evidence for additive epistasis was minimal. Progeny of a particular cross were less resistant to net blotch than the better parent. The most resistant progeny were derived from the cross between the two most resistant parents, Pohto and WW7977, and resistance was governed by at least eleven effective factors. Narrow sense heritability estimates for resistance to net blotch were high during both years (0.84–0.99). It appears that net blotch resistance of progeny from crosses can be largely predicted from reactions of the parents. Quantitative resistance to net blotch can be further advanced by identification and incorporation of superior parents, from a screening such as reported here, into a recurrent selection breeding programme.

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  1. Agricultural Research Centre of Finland, Institute of Crop and Soil Science, Plant Breeding Section, FIN-, 31600, Jokioinen, Finland

    J. Robinson

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Robinson, J. Diallel analysis of net blotch resistance in doubled haploid lines of Nordic spring barleys. Euphytica 110, 175–180 (1999). https://doi.org/10.1023/A:1003749412317

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