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GENOMICS, MOLECULAR GENETICS & BIOTECHNOLOGY

Comparative Mapping of Growth Habit, Plant Height, and Flowering QTLs in Two Interspecific Families of Leymus

^a USDA-ARS, Forage and Range Research Lab., Utah State Univ., Logan, UT 84322-6300
^b Univ. of Missouri-Columbia, Columbia, MO 65211
^c U.S. Army Corps of Engineers, Engineering Research and Development Center-Cold Regions Research and Engineering Lab., Hanover, NH 03755-1290

^* Corresponding author (stlarson{at}cc.usu.edu)

Leymus cinereus (Scribn. & Merr.) Á. Löve and L. triticoides (Buckley) Pilg. are tall caespitose and short rhizomatous perennial Triticeae grasses, respectively. Circumference of rhizome spreading, proportion of bolting culms, anthesis date, and plant height were evaluated in two mapping families derived from two interspecific hybrids of L. cinereus Acc:636 and L. triticoides Acc:641 accessions, backcrossed to one L. triticoides tester. Two circumference, two bolting, and two height QTLs were homologous between families. Two circumference, seven bolting, all five anthesis date, and five height QTLs were family specific. Thus, substantial QTL variation was apparent within and between natural source populations of these species. Two of the four circumference QTLs were detected in homoeologous regions of linkage groups 3a and 3b in both families, indicating that one gene may control much of the dramatic difference in growth habit between these species. A major height QTL detected in both families may correspond with dwarfing mutations on barley 2H and wheat 2A. The L. cinereus parent contributed negative alleles for all four circumference QTLs, five of nine bolting QTLs, two of five anthesis date QTLs, and one of seven height QTLs. Coupling of synergistic QTL allele effects within parental species was consistent with the divergent growth habit and plant height of L. cinereus and L. triticoides. Conversely, antagonistic QTL alleles evidently caused transgressive segregation in reproductive bolting and flowering time.

Abbreviations: AFLP, amplified fragment length polymorphism • ANTH, anthesis date • BOLT, reproductive bolting • CIRC, plant circumference • HGHT, plant height • IM, interval mapping • MQM, multiple-QTL model • QTL, quantitative trail locus (i) • RFLP, restriction fragment length polymorphism • rMQM, restricted MQM mapping • STS, sequence-tagged site • SSR, simple-sequence repeat