Grain yield and breadmaking quality of wheat lines with leaf rust resistance genes Lr29, Lr34, Lr35, and Lr37

[摘要] English: 1. The aim of this study was to determine if the leaf rust resistance genes Lr2g, Lr34,Lr35 and Lr37 have an effect on the quality and yield characteristics of a cultivar it isincorporated into.2. Near-isogenic lines (NIL's) of PalmietlLr2g and PalmietlLr34, as well as ofKaree/Lr2g, Karee/Lr34, Karee/Lr35 and Karee/Lr37 as 'Neil as all relevant parents,were evaluated for four yield and nine quality characteristics in a field experiment inthe central Free State. The experiment was conducted in a randomised blockdesign.3. Results and conclusions:�?The HMW glutenin subunits indicated segregation in BC6, especially in thePalmiet lines.�?Thatcher and Palmiet lines with Lr29 had significantly lower thousand-kernel'Neight values compared to their recurrent parents.�?Palmiet NIL's with Lr29 had significantly shorter mixograph mixing timecompared to Palmiet.�?Karee NIL's with the genes Lr34, Lr35 and Lr37 had significantly better PL-ratio'scompared to Karee.�?None of the leaf rust resistance genes used in this study had an influence on allthe quality characteristics and yield components.�?The results suggested that the introduction of foreign genes will not necessarilyresult in a yield reduction. The only reduction in yield was observed in KareeNIL's containing Lr34.�?The two genetic backgrounds responded differently following to incorporation ofthe same Lr gene.�?Some sister NIL's performed better than others, which emphasises theimportance of sampling.

[发布机构] University of the Free State