Evaluation of Czech hop cultivars since 2010 till 2019

Abstract

Czech hop cultivars were evaluated from 2010 to 2019. A total of 13 cultivars were assessed. The highest yield per plant was found out in cv. Kazbek (3.66 kg/plant), whereas the lowest in cv. Saazer (2.02 kg/plant). Rubín and Boomerang are the cultivars with the lowest variability of the yield per plant. On the contrary, the highest variability was shown by cv. Kazbek. Conclusively the highest content of alpha acids was recorded in cv. Gaia (13.81%), whereas Saazer is the cultivar with the lowest content (2.87%). Significantly highest content of beta acids were recorded in cvs. Gaia, Vital, Boomerang and Bohemie. On the contrary, the lowest content of beta acids was found in cvs. Saazer, Rubín and Bor (below 4%). Kazbek is the cultivar with the highest ratio of cohumulone (36.67% rel.). Cvs. Premiant and Harmonie show the lowest ratio of cohumulone (19.63% rel.). The lowest ratio of myrcene (18.91% rel.) and caryophyllene (8.26% rel.) was recorded in cv. Saazer. The highest ratio of farnesene was found in cv. Saazer (13.34% rel.) and cv. Saaz Late (10.22% rel.). A wide range was found in the ratio of humulene: from 2.15% rel. (cv. Vital) to 35.76% rel. (cv. Bor). Cv. Gaia has the highest ratio of selinene (19.77% rel.).

Evaluation of resistance to Pseudoperonospora humuli and of the content of alpha acids and hop oils in hops of selected genetic resources of hop Humulus lupulus L.

“…All three resistant hops show variability in the alpha acid content of between 20.25% and 33.06%. This range is similar to that of the Czech hop varieties Gaia, Vital, Bor, Harmonie, Sládek, Bohemie Saaz Late and Saaz (Nesvadba et al 2020). Among the wild hops, variability below 20 % in the alpha acid content was found in four wild hops (Sunža from the Caucasus, 132 from Austria, Francuzy from Lithuania, and Kabardina from the Caucasus).…”

Evaluation of yield and alpha acid content in selected hop varieties

“…The other hop varieties showed this parameter between 20% and 30%. The results achieved in Czech hop varieties fully correlate with the results of variability evaluations performed in the years 2010 to 2019 (Nesvadba et al 2020), with Premiant having a variability of 14.14% and Sládek and Saaz between 20% and 30%. None of the Czech hop varieties displayed variability exceeding 30% like the Target and Aurora hop varieties, which are characterized with parameters unsuitable for hop growing under the conditions which are usual in the Czech Republic.…”

“…The other hop varieties were bred from a selection of the best genotypes following intentional hybridization. The results achieved in Czech hop varieties correlated with results from the years 2010 to 2019, with Saaz having an alpha acid content of 2.87% w/w, Sládek 5.94% w/w and Premiant 7.54% w/w (Nesvadba et al 2020).…”

“…Hop varieties are characterized by their yield, resistance to diseases and pests, and sensitivity to agrotechnical interventions. Other significant features are the content and composition of hop resins and essential oils (Nesvadba et al, 2020). These characteristics guarantee the performance of the hop variety.…”

Beer as a Source of Hop Prenylated Flavonoids, Compounds With Antioxidant, Chemoprotective and Phytoestrogen Activity

“…These are a mixture of different fragrances, the content of which varies depending on the hop variety. They have a low boiling point, so it is advisable to add aromatic hops 15 to 30 minutes before the end of boiling or to use cold hopping instead (Dietz et al, 2020 (Nesvadba et al, 2020).…”