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ARS Home » Pacific West Area » Corvallis, Oregon » Forage Seed and Cereal Research » Research » Publications at this Location » Publication #346435

Research Project: Reducing the Impact of Diseases on Hop Production

Location: Forage Seed and Cereal Research

Title: Registration of downy mildew resistant male hop germplasm 'USDA 21087M'

item Henning, John
item Gent, David - Dave
item TOWNSEND, M - Oregon State University
item HAUNOLD, ALFRED - Retired ARS Employee

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/3/2018
Publication Date: 9/13/2018
Citation: Henning, J.A., Gent, D.H., Townsend, M.S., Haunold, A. 2018. Registration of downy mildew resistant male hop germplasm 'USDA 21087M'. Journal of Plant Registrations. 12:379-381.

Interpretive Summary: USDA 21087M was released to the public in 2012 as male hop germplasm possessing strong resistance to hop downy mildew--one of the greatest pathogens affecting hop production in the United States and other regions producing hop. This germplasm was evaluated for disease resistance using both laboratory and field based research and also evaluated for performance in producing superior offspring for hop production. The release and registration of this material is in the Agency's best interest by providing public and private hop breeders access to disease resistant germplasm to incorporate into their respective breeding programs.

Technical Abstract: USDA 21087M (PI __________, CV-__________) was released to the public Dec 6th, 2011. This germplasm has been utilized by USDA-ARS for hop (Humulus lupulus l.) cultivar development for several decades. Non-agency interest in this germplasm was expressed and release of this material is considered beneficial for the US public. USDA 21087M was obtained from former Yugoslavia by the USDA-ARS in 1974 as “Selection 3/3.” The defining characteristics of USDA 21087M is its high resistance to downy mildew [caused by: Pseudoperonospora humuli (Miyabe. & Takah.) G.W. Wilson], potential resistance to non-v4/v6 strains of powdery mildew (Podosphaera macularis Braun & Tak.) and potential good storage-ability in hop offspring. It is expected that hop breeders will utilize this germplasm as a parent for downy mildew resistant hop cultivars. The release of USDA 21087M will provide both public and private breeders new germplasm for cultivar and germplasm development.