Phenotypic and alpha-acid content diversity of wild hop populations in Croatia
2010
Srecec, S.,Krizevci Coll. of Agriculture (Croatia) | Zechner-Krpan, V.,University of Zagreb (Croatia). Dept. of Biochemical Engineering | Petravic-Tominac, V.,University of Zagreb (Croatia). Dept. of Biochemical Engineering | Cerenak, A.,Slovenian Inst. of Hop Research and Brewing, Zalec (Slovenia) | Liber, Z.,University of Zagreb (Croatia). Dept. of Botany and Botanical Garden | Satovic, Z.,University of Zagreb (Croatia). Dept. of Seed Science and Technology
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 alpha-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 not 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 alpha-acids content among populations. Plants exhibiting elongated cone shape had significantly higher alpha-acids contents than those having oval or round cone shapes. Similarly, plants categorized as rough aroma hop cones had the highest content of alpha-acids compared with those categorized as typical hoppy or fine hop aroma hop cones.
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