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. 2013 Sep;6(6):933-48.
doi: 10.1111/eva.12077. Epub 2013 Jun 6.

Genetic Variation in Adaptive Traits and Seed Transfer Zones for Pseudoroegneria Spicata (Bluebunch Wheatgrass) in the Northwestern United States

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Free PMC article

Genetic Variation in Adaptive Traits and Seed Transfer Zones for Pseudoroegneria Spicata (Bluebunch Wheatgrass) in the Northwestern United States

John Bradley St Clair et al. Evol Appl. .
Free PMC article

Abstract

A genecological approach was used to explore genetic variation in adaptive traits in Pseudoroegneria spicata, a key restoration grass, in the intermountain western United States. Common garden experiments were established at three contrasting sites with seedlings from two maternal parents from each of 114 populations along with five commercial releases commonly used in restoration. Traits associated with size, flowering phenology, and leaf width varied considerably among populations and were moderately correlated with the climates of the seed sources. Pseudoroegneria spicata populations from warm, arid source environments were smaller with earlier phenology and had relatively narrow leaves than those from mild climates with cool summers, warm winters, low seasonal temperature differentials, high precipitation, and low aridity. Later phenology was generally associated with populations from colder climates. Releases were larger and more fecund than most of the native ecotypes, but were similar to native populations near their source of origin. Differences among native populations associated with source climates that are logical for survival, growth, and reproduction indicate that genetic variation across the landscape is adaptive and should be considered during restoration. Results were used to delineate seed transfer zones and population movement guidelines to ensure adapted plant materials for restoration activities.

Keywords: Pseudoroegneria spicata; climate change; genecology; plant adaptation; seed transfer; seed zones.

Figures

Figure 1
Figure 1
Study area with level III ecoregions (Omernik 1987) labeled and locations of 114 Pseudoroegneria spicata native collections (•), original locations of three commercial releases (○), and three test sites (Δ).
Figure 2
Figure 2
Geographic variation in the first three principle components (A–C) and related individual traits of dry weight (D), heading date (E), and leaf height/width ratio (F).
Figure 3
Figure 3
Recommended seed zones (labeled 1–7b) for Pseudoroegneria spicata in the inland Pacific Northwest. Ecotypes correspond to small, medium, or large plant size; early or late phenology; and narrow or wide leaf width. Percentages of total area within study area for each seed zone are given in the legend.

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