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United States Department of Agriculture

Agricultural Research Service

Title: Registration of Ortfrr-T94 and Ortfrr-F94 Tall Fescue Germplasm with Resistance to Stem Rust

Authors
item Barker, Reed
item Welty, Ronald

Submitted to: Crop Science
Publication Type: Germplasm Release
Publication Acceptance Date: March 5, 1997
Publication Date: N/A

Interpretive Summary: Two tall fescue germplasms, ORTFRR-T94 and ORTFRR-F94, with high levels of resistance to stem rust were developed by personnel at the USDA-ARS National Forage Seed Production Research Center in cooperation with Oregon State University. ORTFRR-T94 came from 20 plants of six turf-type tall fescue cultivars, and ORTFRR-F94 came from 14 plants of our forage-type cultivars. Number of plants classified as having resistant reaction in two greenhouse inoculations increased from 6% in a parental component composite population to 50% in ORTFRR-T94 and from 5 to 54% in ORTFRR-F94. All cultivars tested using this inoculation procedure were classified as susceptible and had less than 40% plants that were judged resistant. These germplasms will provide sources of resistance to stem rust and will be useful for further cultivar development and other experimental purposes.

Technical Abstract: Two tall fescue (Festuca arundinacea L.) germplasms, ORTFRR-T94 and ORTFRR-F94, with high levels of resistance to stem rust caused by Puccina graminis Pers.:Pers. subsp. graminicola Z. Urban were developed by personnel at the USDA-ARS National Forage Seed Production Research Center in cooperation with Oregon State University. ORTFRR-T94 was derived from 20 plants of six turf-type tall fescue cultivars, and ORTFRR-F94 was derived from 14 plants of four forage-type cultivars. These germplasms will be useful for further cultivar development and other experimental purposes. Number of plants classified as having resistant reaction in two greenhouse inoculations increased from 6% in a parental component composite representing cycle 0 to 50% in ORTFRR-T94 and from 5 to 54% in ORTFRR-F94. All cultivars tested using this inoculation procedure were classified as susceptible to stem rust and had less than 10% plants that were judged resistant. ORTFRR-T94 and ORTFRR-F94 will provide sources of resistance to stem rust that will be useful in developing improved cultivars. Seed of ORTFRR-T94 and ORTFRR-F94 will be stored by the USDA- ARS National Forage Seed Production Research Center and limited quantities of each germplasm made available upon written request

Last Modified: 10/21/2014
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