To improve both yield and bread-making quality simultaneously, 12 BC2F5 breeding lines with high molecular weight glutenin subunits (HMW-GS) 7+8 and 5+10 derived from the cross Yumai 34/3*Lunxuan 987 and selected by markers were used to investigate the yield and quality performance. Cultivar Yumai 34, with excellent bread-making quality, was used as the donor of HMW-GS 7+8 and 5+10, and Lunxuan 987 as the high yielding backcross parent. Nine of twelve lines had higher values for major quality parameters than Lunxuan 987, including dough development time and farinogragh stability, maximum extensograph resistance, and superior loaf volume and total score. Three of four lines with the 1BL/1RS translocation showed negative quality effects. The yields of 11 lines were increased by 3.3 to 19.5% compared with Lunxuan 987; among them, three named CA1063, CA1062 and CA1061 were significantly higher yielding than Lunxuan 987, and higher than the Zhongmai 175 check by 4.1%, 3.5% and 1.9%, respectively. Eight lines, that were not significantly different in yield from Zhongmai 175, exhibited better quality than both Lunxuan 987 and Zhongmai 175. The results indicated that yield and quality could be improved at the same time by molecular marker assisted selection.

English

Lucia Segura

CIMMYT Staff Publications Collection