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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 558607 | USDA 21087 Male Yugoslavian 3/3 | Humulus lupulus L. var. lupulus | Former Serbia and Montenegro | COR |  | Not Available | 1982 | COLLECTED | | | | | | Breeding material | The Agricultural Research Service (ARS) announces the release of `USDA 21087M', a new downy mildew [caused by Pseudoperonospora humuli (Miyabe. and Takah.) G.W. Wilson] resistant hop (Humulus lupulus L.) germplasm. The defining characteristics of USDA 21087M are its resistance to downy mildew and potential for good storagabilty in offspring. USDA 21087M was also the male parent for the Slovenian hop varieties, `Ahil?, `Apolon? and `Atlas?. USDA-ARS anticipates this germplasm will be used in breeding programs as a parent for downy mildew resistant aroma-type hop breeding material. USDA 21087M was obtained from former Yugoslavia by the USDA-ARS in 1974 as ?Selection 3/3.? This accession was collected on 9/30/1970 from Cesnjica, Slovenia (598 m elevation) located in the region of Upper Carniola, Slovenia?a mountainous region northwest of Ljubljana, Slovenia. The Institute of Hop Research, Zalec, Slovenia reported that this accession demonstrated resistance to downy mildew and for this purpose it was integrated into the USDA germplasm collection. USDA 21087M is thought to be a wild landrace of the Balkans in south-central Europe as shown by genetic similarity studies (Townsend et al., 2005). As such, little genetic similarity exists with other European landraces such as `Halletauer?, `Tettnanger? or `Saazer?. USDA 21087M was first grown at the USDA-ARS hop research facility near Corvallis in 1974 and was given the USDA accession number 21087M in 1974. It was evaluated for phenotypic characteristics for several years prior to being saved as a male germplasm. Mating studies performed in 2005 and 2006 under replicated field studies identified this accession as one not having high breeding value for yield in comparison to 30 other USDA-ARS male germplasm accessions (Henning et al., 2010). Chemical analyses of USDA 21087M lupulin glands indicate its primary use as a breeding parent for dual-purpose hop varieties. Alpha acids averaged 39.7% (v/v) in while beta acids averaged 21.4% (v/v) with alpha acids comprising 64.3% of the total bittering acids (v/v). USDA 21087M has reasonably good storage capabilities with an hop storage index (H.S.I.) of 0.262. Replicated field studies with inoculated plants demonstrated that USDA 21087M has resistance to downy mildew infection similar to the varieties `Magnum? and `Fuggle?. Under normal growing conditions, early downy mildew infections should be controlled with fungicides registered for use on hop. Genetic transfer of resistance to offspring has not been studied and the breeding value for this trait is unknown but observations in breeding nurseries suggest offspring possess good resistance.The release of USDA 21087M provides a new male hop germplasm exhibiting potential genetic transfer of resistance to downy mildew and good storagabilty in female offspring. Genetic material of this release has been deposited in the National Germplasm System at the USDA-National Clonal Germplasm Repository in Corvallis, OR. This material will be available for research purposes including the development and commercialization of new cultivars. It is requested that appropriate recognition be given if this germplasm contributes to the development of a new breeding line or cultivar. | 1453579 | PI 558607 |