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ARS Home » Pacific West Area » Logan, Utah » Forage and Range Research » Research » Publications at this Location » Publication #318945

Research Project: Develop Improved Plant Genetic Resources to Enhance Pasture and Rangeland Productivity in the Semiarid Regions of the Western U.S.

Location: Forage and Range Research

Title: Mapping quantitative trait loci controlling seed and grain production traits of intermediate wheatgrass (Thinopyrum intermedium)

Author
item Larson, Steven
item KANTARSK, TRACI - The Land Institute
item ZHANG, XIAOFEI - University Of Minnesota
item DEHAAN, LEE - Kansas State University
item POLAND, JESSE - University Of Minnesota
item Jensen, Kevin
item ANDERSON, JAMES - Utah State University

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 8/15/2015
Publication Date: 11/15/2015
Citation: Larson, S.R., Kantarsk, T., Zhang, X., Dehaan, L., Poland, J., Jensen, K.B., Anderson, J.A. 2015. Mapping quantitative trait loci controlling seed and grain production traits of intermediate wheatgrass (Thinopyrum intermedium). Meeting Abstract.

Interpretive Summary:

Technical Abstract: Intermediate wheatgrass (Thinopyrum intermedium) is a cool-season perennial grass cultivated for seed used in forage production, conservation plantings, and consumable grain products such as flour. Intermediate wheatgrass (2n=6x=42) has a large, allohexploid genome (~13 GB) and is a distant relative of barley (Hordeum vulgare) and bread wheat (Triticium aestivum), which have similar range of adaptation. However, wheat and barley produce substantially larger seeds that contain substantially more carbohydrate and produce more vigorous seedlings. Thus, improvement of seed size and other seed production traits is important for develpment of forage and grain varieties of intermediate wheatgrass. The development of next-generations technologies that enable low-cost genotype-by-sequencing (GBS) has created new opportunities to identify genes and single-nucleotide polymorphism (SNP) markers associated with key agronomic traits in any species, including semi-wild plants such as intermediate wheatgrass. In this project, a linkage map of 1,628 SNP markers in 21 linkage groups was developed from a full-sib family of 234 genotypes derived from a cross of two wheatgrass clones M26 and M35, including one free-threshing genotype. Sequences of SNP markers in these 21 linkage groups were aligned to the seven chromosome sequences of diploid barley (Hordeum vulgare) to identify three sets of seven sets of homologous chromosomes of allohexaploid intermediate wheatgrass. Seed mass, seed length, seed width, percent naked seed (free-threshing seed), seed shattering, number of spiklets per spike, and spike length were measured in clonally replicated field evaluations of the M26 x M35 family in Utah and Kansas. Progeny genotypes showed heritable variation with at least two-fold range of mean values. Comparisons of the number and location of these QTLs indicate that these are complex traits controlled by multiple independent genes. These results elucidate genetic architecture and demonstrate opportunities for genetic improvement of seed mass and other seed production traits in selected intermediate wheatgrass germplasm.