Registration of High Alpha‐Acid Male Hop Germplasm USDA 21267M

Abstract

USDA 21267M (Reg. No. GP-37, PI 559093) male hop (Humulus lupulus L. var. lupulus) germplasm was released to the public 6 Dec. 2011. This germplasm has been used by the USDA-ARS for hop cultivar development for several decades. Nonagency interest in this germplasm was expressed, and release of this material is considered beneicial for the US public. USDA 21267M arose from a cross, made in 1973 involving the hop cultivar Comet and the USDA-ARS hop male germplasm 21110M. The deining characteristics of USDA 21267M are its high alpha acid levels observed in lupulin glands as well as good breeding value for yield, alpha and beta acid levels, and high xanthohumol levels. It is expected that hop breeders will use this germplasm as a parent for high-yielding, high-alpha hop breeding material. The release of USDA 21267M will give both public and private breeders new germplasm for varietal development.

Genetic characterization of downy mildew resistance from the hop (Humulus lupulus L.) line USDA 64035M

“…In general, this study has cautiously shown that small effect and pleiotropic loci underscore the genetic architecture of DMR in hop in 64035M, a line that has played an important role in cultivar development in hop (e.g., Henning & Haunold, 1999a, 1999b, 2012; Henning et al., 2018, 2021). There are two major caveats associated with our study.…”