Plant Soil Environ., 2010, 56(1):37-42 | DOI: 10.17221/130/2009-PSE

Phenotypic and alpha-acid content diversity of wild hop populations in Croatia

S. Srečec1, V. Zechner-Krpan2, V. Petravić-Tominac2, A. Čerenak3, Z. Liber4, Z. Šatović5
1 KriževciCollege of Agriculture, Križevci, Republic of Croatia
2 Department of Biochemical Engineering, Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Republic of Croatia
3 Slovenian Institute of Hop Research and Brewing, Žalec, Slovenia
4 Department of Botany and Botanical Garden, Faculty of Science, University of Zagreb, Zagreb, Republic of Croatia
5 Department of Seed Science and Technology, Faculty of Agriculture, University of Zagreb, Zagreb, Republic of Croatia

An ecogeographical survey of wild hop populations was conducted in the northwest of Croatia in two consecutive years. A total of 121 plants was documented on eight locations. Along with the passport data, the data on three phenotypic traits (no. of leaflets, cone shape, aroma) were gathered during collection, while the content of α-acids in hop cones was determined by lead conductance. Shannon's information index was calculated for each phenotypic trait and was used as a measure of intra- and inter-population diversity. For all analyzed traits, most of the total phenotypic diversity was attributable to differences among plants within populations. The differences in proportions of individuals having a particular trait state between all pairs of populations in the case of leaflet number and cone shapes were non-significant. Four out of 28 pairwise comparisons for aroma were proven significant, indicating the existence of differences in proportions of individuals across populations recorded to have 'typical hoppy', 'fine hop' or 'rough' aroma. No significant differences were observed for α-acids content among populations. Plants exhibiting elongated cone shape had significantly higher α-acids content than those having oval or round cone shapes. Similarly, plants categorized as 'rough' aroma hop cones had the highest content of α-acids compared with those categorized as 'typical hoppy' or 'fine hop aroma' hop cones.

Keywords: Humulus lupulus L.; wild hops; hop cones; qualitative traits; quantitative traits; phenotypic diversity; alpha-acid content

Published: January 31, 2010  Show citation

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Srečec S, Zechner-Krpan V, Petravić-Tominac V, Čerenak A, Liber Z, Šatović Z. Phenotypic and alpha-acid content diversity of wild hop populations in Croatia. Plant Soil Environ. 2010;56(1):37-42. doi: 10.17221/130/2009-PSE.
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