Abstract
Czech hop varieties were evaluated as part of maintenance breeding. The evaluation was performed in a single location between 2011 and 2020. The average weight of hop essential oils (HEOs) is 0.43 to 2.28% w/w. The Saaz, Saaz Brilliant, Mimosa, Saaz Shine and Saaz Comfort hop varieties have a low amount of HEOs. Their maximum content of these compounds amounts to 1.1% w/w. The average proportion of myrcene is between 23.42 and 45.14% rel. Only the Agnus, Vital and Boomerang hop varieties have the maximum myrcene proportion above 50% rel. The average share of caryophyllene ranges between 6.19 and 13.15% rel. Saaz Late has a broad range of caryophyllene percentage – from 5.39% rel. to 15.53% rel. The average percenatge of farnesene is between 0.14 and 16.91% rel. Only the Saaz Comfort and Saaz Shine hop varieties have the maximum farnesene share above 20% rel. The average humulene content has a very broad range between 2.23 and 35.79% rel. The Vital, Mimosa, Gaia and Saaz Comfort hop varieties are in a group with a low humulene percentage, which is clearly different from other hop varieties. The average share of selinenes ranges broadly from 0.97 to 33.56% rel. Mimosa differs from the before mentioned varieties with its proportion of selinenes between 23.08 and 43.75% rel. The aim was to characterize and compare Czech hop varieties in terms of content and composition of HEOs.
Highlights
Hop breeding in the Czech Republic has focused on fine aroma hops
Evaluated hop varieties: 1. Fine aroma hops with the content of alpha acids from 2.5 to 5.5%, with a balanced alpha/ beta ratio and a fine hoppy aroma – Saaz, Saaz Late, Saaz Brilliant, Saaz Comfort and Saaz Shine
Hop varieties from a single location are evaluated within a time span of 10 years
Summary
Hop breeding in the Czech Republic has focused on fine aroma hops. The original local hop varieties, e.g. Saaz, Auscha, Klatovy and Tierschitz hops, were developed from the original populations of the individual locations. The Atlas of Czech Hop Varieties (Nesvadba et al, 2012) states that the content of HEOs in Saaz ranges from 0.4 to 0.8% w/w. The remaining Czech hop varieties are po- In some years, Bor, Agnus and Mimosa had the farnesene sitioned between these two groups, with minimum and proportion of more than 1% rel.
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