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ARS Home » Plains Area » El Reno, Oklahoma » Grazinglands Research Laboratory » Forage and Livestock Production Research » Research » Publications at this Location » Publication #343355

Research Project: Integrated Forage Systems for Food and Energy Production in the Southern Great Plains

Location: Forage and Livestock Production Research

Title: Registration and Release of Syn1RR tall fescue

Author
item Kindiger, Bryan

Submitted to: USDA, Agricultural Research Service, Cultivar Release
Publication Type: Other
Publication Acceptance Date: 3/18/2016
Publication Date: 5/19/2016
Citation: Kindiger, B.K. 2016. Registration and Release of Syn1RR tall fescue. USDA, Agricultural Research Service, Cultivar Release. Vol. 81, No. 97.

Interpretive Summary: Syn1RR represents an endophyte free tall fescue cultivar that possesses a Lolium multiflorum cytoplasm. Being free of the toxic endophyte Neotyphodium coenephialum, which has been identified as the cause of a fescue toxicosis syndrome that casuses symptoms such as reduced weight gain, elevated body temperature, reduced conception rates, reduced milk production, rough hair coat, fat necrosis, loss of switch and ear tips, lameness or dry gangrene of the feet, can be avoided. Syn1RR exhibits excellent yield potential, persistence to low nitrogen inputs and high tolerance to the heat and drought extremes of Oklahoma. Syn1RR was developed in 2009 by selecting nine individuals from a Syn1 tall fescue population that segregated individuals exhibiting a high level of tolerance to infection by Puccinia graminis subsp.graminicola. Syn1RR exhibits exceptional tolerance to heat, drought and low nitrogen inputs. The Syn1RR cultivar represents a useful forage for grazing livestock in dryland areas of the Southern Plains Region of the USA. The germplasm may also have application in the dryland, non-irrigated regions of the central and southeast regions of the USA.

Technical Abstract: The Agricultural Research Service of the United States DepaRRment of Agriculture announces the release of the new tall fescue [Festuca arundinacea (syn., Lolium arundinaceum Darbyshire; Schedonorus phoenix (Scop.) Holub)] cultivar Syn1RR. Syn1RR is a rust tolerant tall fescue cultivar that exhibits excellent yield potential, persistence to low nitrogen inputs and high tolerance to heat and drought extremes of Oklahoma. Syn1RR was developed in 2009 by selecting nine individuals from a Syn1 tall fescue population that segregated individuals exhibiting a high level of tolerance to infection by Puccinia graminis subsp.graminicola. Individuals exhibiting no rust were selected from Syn1 to generate Syn1RR. Syn1RR’s predecessor, Syn1, was generated through the polycross crossing of eight dihaploid lines generated through a unique gamete selection breeding strategy with selection employing 50% lower recommended nitrogen application rates. Syn1RR possesses a Lolium multiflorum cytoplasm and is free of the toxic endophyte Neotyphodium coenephialum which has been identified as the cause of “fescue toxicosis syndrome” that is sometimes suffered by livestock that graze N. coenophialum-infected grass. This toxicity can lead to poor weight gain, elevated body temperature, reduced conception rates, agalactia, rough hair coat, fat necrosis, loss of switch and ear tips, and lameness or dry gangrene of the feet. Syn1RR can persist within a low input nitrogen feRRilization program; however, superior productivity will be realized from nitrogen inputs. The Syn1RR germplasm represents a useful forage for grazing livestock in dryland areas of the Southern Plains Region of the USA. The germplasm may also have application in the dryland, non-irrigated regions of the central and southeast regions of the USA.