Abstract
ABSTRACT Many native grasses display seed shattering and other seed production problems. Basin wildrye [ Leymus cinereus (Scribn. & Merr.) Á. Löve] and creeping wildrye [ L. triticoides (Buckley) Pilg.] are perennial Triticeae grasses native to western North America. In this study, variation in the number of florets per inflorescence, percent seed set, seed mass, seed shattering, and seed dormancy was measured in clonally replicated multiyear field evaluations of 164 progeny derived from a backcross between a creeping × basin wildrye hybrid and a true creeping wildrye tester. Genomewide quantitative trait locus (QTL) scans detected independent gene effects for all five traits and one pleiotropic QTL, located on Triticeae homeologous chromosome group 6, associated with major seed shattering (43.1% R 2 , 26.9 log of odds likelihood ratio [LOD]) and seed dormancy (24.1% R 2 , 10.6 LOD) effects. We hypothesize that a dominant basin wildrye gene creates an abscission that promotes seed disarticulation but hinders seed development and seed ripening in the creeping wildrye backcross family. Alignments of Leymus chromosome 6 expressed sequence tag markers to the rice ( Oryza ) genome reveal well‐defined correspondence of Leymus wildrye and American wildrice ( Zizania palustris L.) seed shatter QTLs.
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Claims 5
Claim · model-written summary
Independent genetic effects were detected for five seed traits.
- Outcome
- independent gene effects for all five traitse0
Not reportedTaxon
Verbatim
e0“Genomewide quantitative trait locus (QTL) scans detected independent gene effects for all five traits”
Claim · model-written summary
A chromosome group 6 QTL was associated with seed shattering.
Not reportedTaxonDirection
Verbatim
e0“one pleiotropic QTL, located on Triticeae homeologous chromosome group 6, associated with major seed shattering (43.1% R 2 , 26.9 log of odds likelihood ratio [LOD])”
Claim · model-written summary
The same QTL was associated with seed dormancy.
Not reportedTaxonDirection
Verbatim
e0“one pleiotropic QTL, located on Triticeae homeologous chromosome group 6, associated with major seed shattering (43.1% R 2 , 26.9 log of odds likelihood ratio [LOD]) and seed dormancy (24.1% R 2 , 10.6 LOD) effects.”
Claim · model-written summary
A dominant basin wildrye gene was hypothesized to promote seed disarticulation and hinder development.
Verbatim
e0“a dominant basin wildrye gene creates an abscission that promotes seed disarticulation but hinders seed development and seed ripening”
Claim · model-written summary
Leymus chromosome 6 markers corresponded to wildrice seed shatter QTLs.
Verbatim
e0“Alignments of Leymus chromosome 6 expressed sequence tag markers to the rice ( Oryza ) genome reveal well‐defined correspondence of Leymus wildrye and American wildrice ( Zizania palustris L.) seed shatter QTLs.”