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Attempted Compensation for Linkage Drag Affecting Agronomic Characteristics of Durum Wheat 1AS/1DL Translocation Lines
Author(s) -
Klindworth Daryl L.,
Hareland Gary A.,
Elias Elias M.,
Xu Steven S.
Publication year - 2013
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2012.05.0310
Subject(s) - biology , chromosomal translocation , cultivar , glutenin , agronomy , yield (engineering) , genetics , gene , materials science , protein subunit , metallurgy
Yield reduction due to linkage drag is a major problem when introgressing alien chromatin into durum wheat [ Triticum turgidum L. subsp. durum (Desf.) Husn.]. Here we report attempts to compensate for yield losses associated with linkage drag in 1AS·1AL‐1DL translocation lines of durum wheat. Near‐isogenic lines (NILs) were produced by six backcrosses of a translocation stock to cultivars Renville, Rugby, Lebsock, Ben, and Maier. Rugby was found to be composed of two biotypes, with one biotype having high molecular weight (HMW) glutenin subunits 1Bx6+1By8 (Rugby68) and the second biotype having only 1Bx6 (Rugby6), and a set of NILs based on each biotype was produced. Near‐isogenic translocation lines (T‐lines) and nontranslocation lines (N‐lines) were yield tested at five North Dakota locations. Nontranslocation lines did not significantly differ from their parental cultivars for yield, heading date, height, protein content, test weight, or thousand kernel weight (TKW). All T‐lines yielded significantly less than their sibling N‐lines although the Lebsock T‐lines had less linkage drag than other T‐lines. All T‐lines had from 5.9 to 11.3% reduction in TKW. The results indicate that genetic background can partially and possibly completely compensate for linkage drag. But for the 1AS·1AL‐1DL translocation lines, improved yield will be dependent on improving TKW, and this may be best accomplished by further reducing the size of the alien segment