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Combining ability for Fusarium head blight resistance in wheat (Triticum aestivum L.)

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Author(s): Subas Malla | Amir M.H. Ibrahim | Karl D. Glover | William A. Berzonsky

Journal: Communications in Biometry and Crop Science
ISSN 1896-0782

Volume: 5;
Issue: 2;
Start page: 116;
Date: 2010;
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Keywords: Fusarium head blight | diallel | combining ability | heritability | GGE biplot

ABSTRACT
Fusarium head blight (FHB) caused by Fusarium graminearum reduces wheat (Triticum aestivum L. em. Thell) grain yield and end-use quality worldwide. Three each of FHB susceptible (‘Nekota’, ‘2137’, and ‘Harding’) and resistant (‘Ning 7840’, ‘ND2710’ and ‘BacUp’) parents were included in a partial diallel mating design (Griffing’s Method 4, Model 1). The F4:5 progeny was evaluated for healthy index, undamaged kernels, and deoxynivalenol (DON) content following artificial inoculation and mist-irrigation in 2006 and 2007. General combining ability (GCA) was highly significant (P < 0.01) for healthy index; whereas specific combining ability (SCA) and GCA-by-year interaction were not significant. The combining ability ratio and narrow-sense heritability were 0.95 and 0.83, respectively. The Genotype, Genotype-by-Environment (GGE) biplot analysis showed that the ND2710/BacUp combination had the best healthy index and undamaged kernels; whereas Ning 7840 contributed resistance to DON accumulation. The results indicated additive gene effects mainly control that healthy index. Thus, genetic gain in developing resistance in wheat can be achieved through selection.

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