Comparative mapping of fiber,protein, and mineral content QTLs in two interspecific <Emphasis Type="Italic">Leymus</Emphasis> wildrye full-sib families |
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Authors: | Steven R Larson Henry F Mayland |
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Institution: | (1) United States Department of Agriculture, Agriculture Research Service, Forage and Range Research Laboratory, Utah State University, Logan, UT 84322-6300, USA;(2) Northwest Irrigation and Soils Research Laboratory, Agriculture Research Service, United States Department of Agriculture, Kimberly, ID 83341, USA |
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Abstract: | Crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), and mineral content are important components
of forage quality in grasses. Elevated K]/(Ca] + Mg]) ratios (KRAT) substantially increase the risk of grass tetany (hypomagnesemia)
in grazing animals, which is a serious problem associated with some cool-season grasses. The objectives of this study were
to map and compare QTLs controlling concentrations of CP, NDF, ADF, Al, B, Ca, Cl, Cu, Fe, K, Mg, Mn, Na, P, S, Si, Zn, and
KRAT in two full-sib Leymus triticoides × (L. triticoides × L. cinereus) TTC1 and TTC2 families. Significant genetic variation and QTLs were detected for all traits, with evidence of conserved
QTLs for ADF (LG1a, LG5Xm, LG7a), NDF (LG7a), Ca (LG1b), CP, (LG5Xm), KRAT (LG3b, LG6b, LG7a, LG7b), Mn (LG2b, LG3b, LG4Xm),
and S (LG3a) content in both TTC1 and TTC2 families. Moreover, the direction of QTL effects was the same for 13 of the 14
homologous QTLs in both families. The TTC1 and TTC2 KRAT QTLs on LG7a and LG7b were located near markers defining homoeologous
relationships between the sub-genomes of allotetraploid Leymus, suggesting possible QTL homoeology. Another 88 QTLs were unique to one family or the other, but many of these clustered
in genome regions common between the two families. These results will support development of new Leymus wildrye forages and help characterize genes controlling mineral uptake and fiber synthesis. |
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Keywords: | Forage Fiber Grass Mineral Protein QTL |
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