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Title: American Type Culture Collection Deposit Num. PTA-10315

item Kindiger, Bryan

Submitted to: Germplasm Release
Publication Type: Germplasm Release
Publication Acceptance Date: 8/6/2009
Publication Date: 8/7/2010
Citation: Kindiger, B.K. 2010. American Type Culture Collection Deposit Num. PTA-10315. Germplasm Release.

Interpretive Summary: An annual ryegrass line designated IL2, has been selected from a population designated IL0 that following hybridization with other species comprising the same genus, generates hybrid individuals. IL2 is a single plant selection from the IL0 population and exhibits partial pollen sterility and an increased level of plant vigor. IL2 possesses less genetic diversity than the original IL0 population and as should provide a superior breeding resource. Hybrids generated using this line can produce a low level of viable seed that can be utilized in a traditional selection or breeding program. The few seed generated from the hybrid materials are generated via an atypical, sexual reproductive approach. The infrequent seed produced by these hybrids results in the generation of offspring possessing normal and variable genetic constitutions. The generation of offspring attained through this approach may be useful in the development of new and superior cultivars via a traditional breeding approach. This research will be valuable to breeders involved in the development of superior cool-season perennial grass cultivars.

Technical Abstract: A diploid (2n=2x=14) Lolium multiflorum, designated IL2, represents a single plant selection from a segregating population designated as IL0. IL2 exhibits an elevated level of pollen sterility compared to individuals comprising IL0 and has been evaluated and identified to produce hybrid seed when utilized as the maternal parent in an array of Lolium ssp. hybridizations. The genetic composition of IL2 is less diverse than the genetic composition of IL0. The developed hybrids infrequently produce a small number of viable seed via a parthenogenic response. In some instances, genome loss is observed in offspring attained from the generated hybrids. Utilizing these materials in a traditional breeding method may provide for the development of new and superior Lolium ssp. cultivars. This research will be of value to researchers of Lolium breeding programs that are focused on developing improved germplasm.