Relationships among seed quality characteristics in a collection of western wheatgrass germplasms |
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Authors: | Joseph G Robins Kishor Bhattarai B Shaun Bushman Steven R Larson |
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Institution: | (1) USDA-ARS, Forage and Range Research Laboratory, Logan, UT 84322, USA;(2) The Samuel Roberts Noble Foundation, Forage Improvement Division, Ardmore, OK 73401, USA |
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Abstract: | Although western wheatgrass Pascopyrum smithii (Rydb.)] is an important perennial grass species for agriculture and conservation management in central and western North
America, its lack of adequate seed production and seedling vigor limits its effectiveness. To address the weaknesses a study
was conducted to assess rhizome spread, seed production, seed weight, germination percentage, and emergence rate of seed produced
from 48 western wheatgrass cultivars and germplasm accessions at a field site near Nephi, UT, USA during 2007 and 2008. The
western wheatgrass cultivars had approximately two times higher seed production than the germplasm accessions during both
2007 and 2008 and also had higher seed weight in 2007 and emergence rate in 2008. The germplasm accessions had higher seed
weight in 2008. For the remaining traits there were no differences among the different germplasm sources. Based on principle
component analysis a subset of cultivars and germplasm accessions with high seed production and emergence rate were identified
that could be used to produce improved cultivars and germplasms. There was little evidence of strong relationship between
geographic, genetic, and phenotypic distances among the various lines examined. Additionally, based on genetic marker data,
a subset of lines was grouped into three populations. Based on these results, selection among lines could occur to maximize
agricultural performance regardless of site of origin, or within population selection could be practiced to meet conservation
goals of minimizing hybridization among populations. |
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