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Identification of 1BL/1RS Translocation Based on Mixograph Parameters in Common Wheat

LIU Jian-Jun1,XIAO Yong-Gui2,CHENG Dun-Gong1,LI Hao-Sheng1,LIU Li2,SONG Jian-Min1,LIU Ai-Feng1,ZHAO Zhen-Dong1,and HE Zhong-Hu2,3,1 Crop Research Institute,Shandong Academy of Agricultural Sciences,Jinan 250100,China;2 Institute of Crop Sciences/National Wheat Improve-ment Centre/National Key Facility for Crop Gene Resources and Genetic Improvement,Chinese Academy of Agricultural Sciences,Beijing 100081,China;3 CIMMYT China Office,Beijing 100081,China  
1BL/1RS translocation has been widely used for improving agronomic performance and disease resistance in wheat(Triticum aestivum L.),however,it has strong negative effect on processing quality.To develop a method for 1BL/1RS transloca-tion identification with mixograph parameters,404 advanced lines from 146 crosses in 2005–2006(experiment I) and 175 ad-vanced lines and main cultivars of Shandong province(experiment II) in 2005–2006 and 2006–2007 cropping seasons were used in this study.All materials were sown under irrigation condition in a randomized complete design with 1 replication in Jinan.The genetic effect of 1BL/1RS translocation on mixograph parameters was investigated.The variations of mixograph parameters under different combinations of the high molecular weight glutenin subunits(HMW-GS) and low molecular weight glutenin subunits(LMW-GS) were also analyzed.1BL/1RS translocation lines showed significantly shorter mixing time,less bandwidth of peak and bandwidth after 1 min peak,and higher angle of descent and the bandwidth ratio(the ratio of bandwidth of peak/bandwidth after 1 min peak) in comparison with non-1BL/1RS translocation lines.It indicated that the 1BL/1RS translocation has deleterious effects on mixograph parameters.Mixograph of the 1BL/1RS translocation was characterized with the bandwidth sharply declin-ing and narrowing after 1 min peak,and increasing the bandwidth ratio,whereas the bandwidth of non-1BL/1RS translocations declined gently after 1 min peak or had a longer mixing tolerance,and had a little variation about the bandwidth ratio.Further-more,85.2%(experiment I) and 96.8%(experiment II) accuracies were achieved in grouping the 1BL/1RS translocation and non-1BL/1RS translocation on the basis of the band width ratio,i.e.,1BL/1RS translocation line had a value more than or equal to 1.6,and non-1BL/1RS translocation line had a value smaller than 1.6.Although the Glu-B3 alleles showed better quality parame-ters when HMW-GS 5+10 was presented,it was still the most unfavorable allele on mixograph parameters among all Glu-B3 al-leles.Therefore,mixograph parameters could be used to determine the rheological properties and the presence of 1BL/1RS translocation.
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