Genetic analysis of resistance to root-lesion nematode (Pratylenchus thornei) in wheat |
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Authors: | R. S. Zwart J. P. Thompson I. D. Godwin |
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Affiliation: | Department of Primary Industries, Agency for Food and Fibre Sciences, Queensland, PO Box 2282, Toowoomba, Qld 4350, Australia, E-mail: rebecca.zwart@dpi.qld.gov.au;School of Land and Food Sciences, University of Queensland, Brisbane, Qld 4072, Australia |
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Abstract: | The inheritance of resistance to root‐lesion nematode was investigated in five synthetic hexaploid wheat lines and two bread wheat lines using a half‐diallel design of F1 and F2 crosses. The combining ability of resistance genes in the synthetic hexaploid wheat lines was compared with the performance of the bread wheat line ‘GS50a’, the source of resistance to Pratylenchus thornei used in Australian wheat breeding programmes. Replicated glasshouse trials identified P. thornei resistance as polygenic and additive in gene action. General combining ability (GCA) of the parents was more important than specific combining ability (SCA) effects in the inheritance of P. thornei resistance in both F1 and F2 populations. The synthetic hexaploid wheat line ‘CPI133872’ was identified as the best general combiner, however, all five synthetic hexaploid wheat lines possessed better GCA than ‘GS50a’ The synthetic hexaploid wheat lines contain novel sources of P. thornei resistance that will provide alternative and more effective sources of resistance to be utilized in wheat breeding programmes. |
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Keywords: | Triticum aestivum Pratylenchus thornei combining ability diallel crosses root-lesion nematode synthetic hexaploid wheat |
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