Abstract
New sources of partial resistance to Fusarium head blight (FHB) in wheat have been identified over the past decade; however, little is known of their breeding value. A 20 parent partial diallel that included resistant genotypes from the U.S., Europe, China and South America was used to evaluate the potential of these sources of resistance as parents in wheat breeding programs. Eight plants replication−1 of each of 190 crosses and 20 parents were point-inoculated with Fusarium graminearum under greenhouse conditions in two replicated experiments. Both general (GCA) and specific combining ability (SCA) were significant. Most of the variance for FHB severity was associated with additive genes; however, estimates for SCA ranged from highly negative to highly positive in both resistant × resistant and resistant × susceptible crosses which suggest that improving FHB resistance through gene pyramiding strategies based on additive genetic variation may be complicated by interaction effects that condition FHB resistance.
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Acknowledgements
The authors thank Mr. David Tague, Senior Research Specialist with the University of Missouri Wheat Breeding Program, for help with crosses and data analysis for this study. This study was in part supported by the U.S. Department of Agriculture under Award No. 59-0790-9-052 and is a cooperative project with the U.S. Wheat and Barley Scab Initiative. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the U.S. Department of Agriculture.
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Abate, Z.A., McKendry, A.L. Diallel analysis of Fusarium head blight resistance in genetically diverse winter wheat germplasm. Euphytica 175, 409–421 (2010). https://doi.org/10.1007/s10681-010-0195-y
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DOI: https://doi.org/10.1007/s10681-010-0195-y