Mode of Pollination of Perennial Species of the Triticeae in Relation to Genomically Defined Genera

Jensen, Kevin B.; Dewey, Douglas R.; Zhang, Y. F.

doi:10.4141/cjps90-024

Cited by 89 publications

(56 citation statements)

References 9 publications

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“…The wildryes are adapted to mean annual precipitation zones of 25-50 cm (Wasser 1982) and grow at elevations of 300-2,750 m. They hold potential as an alternative crop for many irrigation systems challenged by salinity and declining water supplies in the western United States (Larson et al 2006). The species are naturally outcrossed and highly self-sterile (Jensen et al 1990). The basic Leymus genome is composed of seven chromosomes (Dewey 1984).…”

Section: Botanical Descriptionmentioning

confidence: 99%

Improvement of Perennial Forage Species as Feedstock for Bioenergy

Anderson¹,

Casler

Baldwin

Genetic Improvement of Bioenergy Crops

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Section: Botanical Descriptionmentioning

confidence: 99%

Improvement of Perennial Forage Species as Feedstock for Bioenergy

Anderson¹,

Casler

Baldwin

Genetic Improvement of Bioenergy Crops

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“…Both BWR and CWR are considered highly self-incompatible [52] and previous studies showed that the 4X Acc:641.T CWR genet was receptive to pollen from the TC1 and TC2 single-cross hybrids with less than 4% selfing using paper bags to cover its spike-inflorescences [51]. However, the quantities of seed produced by these techniques is insufficient for extensive testing in seeded field trials.…”

Section: Plant Materials Used For Making Cwr × Bwr Hybridsmentioning

confidence: 99%

Development and Testing of Cool-Season Grass Species, Varieties and Hybrids for Biomass Feedstock Production in Western North America

Larson

Pearson²,

Jensen

et al. 2017

Agronomy

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Abstract:Breeding of native cool-season grasses has the potential to improve forage production and expand the range of bioenergy feedstocks throughout western North America. Basin wildrye (Leymus cinereus) and creeping wildrye (Leymus triticoides) rank among the tallest and most rhizomatous grasses of this region, respectively. The objectives of this study were to develop interspecific creeping wildrye (CWR) × basin wildrye (BWR) hybrids and evaluate their biomass yield relative to tetraploid 'Trailhead', octoploid 'Magnar' and interploidy-hybrid 'Continental' BWR cultivars in comparison with other perennial grasses across diverse single-harvest dryland range sites and a two-harvest irrigated production system. Two half-sib hybrid populations were produced by harvesting seed from the tetraploid self-incompatible Acc:641.T CWR genet, which was clonally propagated by rhizomes into isolated hybridization blocks with two tetraploid BWR pollen parents: Acc:636 and 'Trailhead'. Full-sib hybrid seed was also produced from a controlled cross of tetraploid 'Rio' CWR and 'Trailhead' BWR plants. In space-planted range plots, the 'Rio' CWR × 'Trailhead' BWR and Acc:641.T CWR × Acc:636 BWR hybrids displayed high-parent heterosis with 75% and 36% yield advantages, respectively, but the Acc:641.T CWR × 'Trailhead' BWR hybrid yielded significantly less than its BWR high-parent in this evaluation. Half-sib CWR × BWR hybrids of Acc:636 and 'Trailhead' both yielded as good as or better than available BWR cultivars, with yields similar to switchgrass (Panicum virgatum), in the irrigated sward plots. These results elucidate opportunity to harness genetic variation among native grass species for the development of forage and bioenergy feedstocks in western North America.

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“…Genomic classification is based on an evolutionary phylogeny that is tested by hybridization of polyploid grasses with monogenomic species and subsequent identification of the shared genomes by observing chromosome pairing during meiosis in the interspecific hybrids (Jensen et al 1990;Mason-Gamer 2001). These cytogenetic studies have led to changes in the classification of many species of Elymus, Agropyron, Leymus, and Pseudoroegneria (Barkworth and Dewey 1985;Dewey 1982Dewey , 1984Löve 1982Löve , 1984.…”

Section: Introductionmentioning

confidence: 99%

A molecular genetic linkage map identifying the St and H subgenomes of Elymus (Poaceae: Triticeae) wheatgrass

Mott

Larson

Jones

et al. 2011

Genome

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Elymus L. is the largest and most complex genus in the Triticeae tribe of grasses with approximately 150 polyploid perennial species occurring worldwide. We report here the first genetic linkage map for Elymus. Backcross mapping populations were created by crossing caespitose Elymus wawawaiensis (EW) (Snake River wheatgrass) and rhizomatous Elymus lanceolatus (EL) (thickspike wheatgrass) to produce F(1) interspecific hybrids that were then backcrossed to the same EL male to generate progeny with segregating phenotypes. EW and EL are both allotetraploid species (n = 14) containing the St (Pseudoroegneria) and H (Hordeum) genomes. A total of 387 backcross progeny from four populations were genotyped using 399 AFLP and 116 EST-based SSR and STS markers. The resulting consensus map was 2574 cM in length apportioned among the expected number of 14 linkage groups. EST-based SSR and STS markers with homology to rice genome sequences were used to identify Elymus linkage groups homoeologous to chromosomes 1-7 of wheat. The frequency of St-derived genome markers on each linkage group was used to assign genome designations to all linkage groups, resulting in the identification of the seven St and seven H linkage groups of Elymus. This map also confirms the alloploidy and disomic chromosome pairing and segregation of Elymus and will be useful in identifying QTLs controlling perennial grass traits in this genus.

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Mode of Pollination of Perennial Species of the Triticeae in Relation to Genomically Defined Genera

Cited by 89 publications

References 9 publications

Improvement of Perennial Forage Species as Feedstock for Bioenergy

Improvement of Perennial Forage Species as Feedstock for Bioenergy

Development and Testing of Cool-Season Grass Species, Varieties and Hybrids for Biomass Feedstock Production in Western North America

A molecular genetic linkage map identifying the St and H subgenomes of Elymus (Poaceae: Triticeae) wheatgrass

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