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United States Department of Agriculture

Agricultural Research Service

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: UTDG -101, a late-maturing orchardgrass germplasm with increased winter hardiness and forage quality)

Author
item Jensen, Kevin
item Robins, Joseph
item Bushman, Shaun
item Johnson, Douglas
item Stratton, Samuel
item Heaton, Kevin

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/25/2014
Publication Date: 8/25/2014
Citation: Jensen, K.B., Robins, J.G., Bushman, B.S., Johnson, D.A., Stratton, S.D., Heaton, K. 2014. UTDG -101, a late-maturing orchardgrass germplasm with increased winter hardiness and forage quality. Journal of Plant Registrations. 8:318-323.

Interpretive Summary: The United States Department of Agriculture - Agricultural Research Service announces the public release of the orchardgrass UTDG-101 germplasm as a late-maturing grass with excellent forage quality and increased winter tolerance for use in orchardgrass breeding programs. UTDG-101 originated from four orchardgrass collections made within 100 km west-southwest of Zhaosu County, Xinjiang Uyghur Autonomous Region, China. Spring forage crude protein concentrations were greater in UTDG-101 (191.4 g kg-1) compared to a range of 132.6 to 158.2 g kg-1 in cultivars Benchmark Plus, Potomac, Paiute, and Seco at Buck Creek, IN. UTDG-101 had 15% less ADF (293.2 g kg-1) and 13% less NDF (495.0 g kg-1) than the other orchardgrasses. Sugar levels in were 30 and 15% greater in UTDG-101 forage when harvested 16 May (58.8 g kg-1) and 5 July (34.2 g kg-1) than the other orchardgrass. UTDG-101 had a 30 and 19% increase in water-soluble carbohydrate concentrations on 16 May (75.8 g kg-1) and 5 July (47.9 g kg-1) over the other orchardgrasses. Due to the high combining ability of UTDG-101 for flowering date forage nutritional quality, it represents new germplasm useful for developing late-maturing orchardgrass with increased forage quality and reduced winter injury for use in alfalfa mixtures.

Technical Abstract: There is a need to identify novel germplasm that is late-maturing, winter hardy, and nutritious that can be incorporated into current orchardgrass breeding programs. The United States Department of Agriculture - Agricultural Research Service announces the public release of a late-maturing orchardgrass UTDG-101 germplasm with excellent forage quality and increased winter tolerance for use in orchardgrass breeding programs. UTDG-101 traces back to polycross seed that originated from crosses among four orchardgrass collections (PI 659612, PI 659613, W6 20243, and W6 20247) made within a region 100 km west-southwest of Zhaosu County, Xinjiang Uyghur Autonomous Region, China. Based on pairwise O-st values (SSR's), UTDG-101 is genetically distinct from orchardgrass cultivars 'Paiute', 'Pennlate', and 'Benchmark'. Diagnostically, UTDG-101 has significantly (P<0.05) longer flag leaves than the orchardgrass cultivars examined in this study, UTDG-101 is an autotetraploid (2n=4x=28). In forage harvested 16 May 2011, UTDG-101 had significantly greater crude protein (CP) (191.4 g kg-1), relative feed value (124.2), sugars (58.8 g kg-1), water-soluble carbohydrates (sugars + fructans; WSC) (75.8 g kg-1), and digestibility (660.6 g kg-1) and significantly lower acid detergent fiber (ADF) (293.2 g kg-1) and neutral detergent fiber (NDF) (495.6 g kg-1) than cultivars Benchmark Plus, Potomac, Paiute, and Seco. Forage of UTDG-101 harvested on 5 July 2011 had significantly lower NDF and increased fructan, sugar, and WSC concentrations than the check cultivars. UTDG-101 exhibited significantly (P<0.05) less winter injury than other orchardgrass cultivars, tall fescue, and perennial ryegrass cultivars examined.

Last Modified: 8/24/2016
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