| To improve wheat yield and bread quality simultaneously, 12 BC2F5 breeding lines with high molecular glutein subunits (HMW GS) of 7+8 and 5+10, which derived from the cross between Yumai 34 and Lunxuan 9873 and identified by molecular marker assisted selection, were used to investigate the performance of yield and quality. The cultivar Yumai 34 with high bread making quality was used as the donor of HMW GS 7+8 and 5+10, and Lunxuan 987 as the high yield backcross parent. Results showed that 9 out of the 12 lines had higher values than Lunxuan 987 on most of the quality parameters, such as dough development time and stability of farinogragh, maximum resistance of extensogragh, mixing time, peak integral and Time X width at 8 minute of mixogragh, loaf volume and total score, which ranging from 0.5 to 4.3 minutes, 2.6 to 12.4 minutes, 118.4 to 315.3 BU, 0.7 to 3.5 minutes，23.6% TQ·min to 134.9% TQ·min，6.1% to 9.7%，80 to 165 cm3, 12.5 to 30 points, respectively. 1BL/1RS translocation had great negative effect on quality, but with exception. The yields of 11 lines increased by 3.3% to 19.5% compared with Lunxuan 987. Among the 11 lines, the yield of three lines named as CA1063, CA1062 and CA1061 were significant higher than that of Lunxuan 987, and were higher than that of check cultivar Zhongmai 175 by 4.1%, 3.5% and 1.9%, respectively. Eight lines, which did not show significant difference in yield with Zhongmai 175, exhibited better quality compared with Lunxuan 987 and Zhongmai 175. It indicated that yield and quality could be improved at same time by molecular marker assisted selection. |
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