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.

Trefilová, Markéta; Nesvadba, Vladimír; Charvátová, Jitka

doi:10.17221/70/2021-cjgpb

Cited by 4 publications

(3 citation statements)

References 9 publications

(8 reference statements)

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“…An average content of all the above varieties fell within the range specified in Czech Hops Varieties (Nesvadba et al, 2022c). Trefilová et al (2021) evaluated the content of alpha acids in Gaia and Boomerang within the collection of genetic resources in the Czech Republic between 2016 and 2020. Their results are almost identical with those achieved in our evaluation: Gaia and Boomerang had an alpha acids content amounting to 13.34% w/w and 12.06% w/w, respectively.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of variability of the content of alpha and beta acids in Czech bittering hop varieties (Humulus lupulus L.)

Nesvadba

Straková

Fritschová

et al. 2023

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Czech bitter varieties were evaluated between 2010 and 2022. Hop varieties displayed an average content of alpha acids between 10.24% w/w (Agnus) and 13.73% w/w (Gaia). Variability below 15%, proved good stability of alpha acids content in all tested bittering hops. All varieties showed a decrease in the content of alpha acids over a period of 13 years of hop cultivation. The highest content of beta acids was determined in Gaia (7.30% w/w). In contrast, the lowest content of beta acids was found in Rubín (3.73% w/w). The new bitter genotypes Uran and 5304 had an average alpha acid content of 11.56% w/w and 10.82% w/w, respectively. Uran showed an average beta acid content of 5.47% w/w and for the genotype 5304 it was 3.61% w/w. In terms of the alpha/beta acids ratio, the hop varieties can be divided into three groups. The first group included the varieties with an alpha/beta acids ratio below 2, i.e. Vital, Boomerang and Gaia. While Agnus and Uran displayed an alpha/beta ratio slightly above 2. The highest alpha/beta ratio above 3 was found in Rubín and the 5303 genotype.

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Section: Resultsmentioning

confidence: 99%

Evaluation of variability of the content of alpha and beta acids in Czech bittering hop varieties (Humulus lupulus L.)

Nesvadba

Straková

Fritschová

et al. 2023

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“…Breeding objectives have always been established to include resistance to fungal diseases, high yields, desired content, and composition of hop resins and oils (Trefilová et al, 2022). Naturally, throughout the breeding process, the stability of qualitative and quantitative traits has been monitored from the perspectives of both brewing and cultivation requirements.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Czech hop varieties (Humulus lupulus L.) in a dry area without irrigation

Nesvadba,

Klas,

Charvátová

et al. 2023

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Since 2017, a field experiment has been conducted in a dry area with 11 Czech hop varieties. The highest yields were achieved by the Uran variety (2.83 t/ha) and Saaz Shine variety (2.76 t/ha), which also exhibited the lowest yield variability, at 11.17% (Saaz Shine) and 12.53% (Uran). The lowest hop yield was recorded by the Harmonie variety (1.17 t/ha), which also showed high yield variability (30.92%). The Bohemie variety had the highest yield variability of hops at 35.26%. While the Gaia (14.66% w/w) and Uran (13.53% w/w) varieties had the highest alpha acid content. Conversely, the Mimosa variety showed the lowest alpha acid content (1.56% w/w) and also the lowest alpha/beta acid ratio (0.29). The Rubín variety reached the highest alpha/beta acid ratio (3.00). The Uran variety exhibited the lowest variability in alpha (6.16%) and beta (6.28%) acid content. In contrast, the Harmonie variety had the highest variability in alpha (59.02%) and beta (38.18%) acid content. The Uran and Saaz Shine varieties are the most suitable for the dry area. Additionally, the Gaia and Saaz Brilliant varieties showed good performance parameters. The hop varieties Vital, Gaia, Saaz Brilliant, and Saaz Shine had the most intense hop aroma, while the Boomerang and Uran varieties had a high intensity of spicy aroma.

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“…Genetic hop sources constitute an initial breeding material (Charvátová et al, 2017). Hop varieties need to be resistant towards fungal diseases (Trefilová et al, 2022), tolerate drought (Nesvadba et al, 2022), and they need to fulfil required agrotechnical properties. Also they must be storable, have high yields and the necessary resin content (Čerenak et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of fine aroma Saaz Shine hop variety

Nesvadba

Charvátová

Trnková

2022

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The Saaz Shine variety was registered in 2019. It was tested in two areas, Chrášťany (no irrigation) and Stekník (with irrigation), between 2017 and 2021. An average hop yield in Stekník is 2.62 t/ha and in Chrášťany it is 2.54 t/ha. No conclusive difference in yields was determined. An average content of alpha acids was 4.67% in Chrášťany and 3.18% in Stekník, therefore the content of alpha acids in Saaz from Chrášťany has been proven to be higher than in Stekník. There is a conclusively higher content of essential oils in hops from Chrášťany (0.65g/100 g) than from Stekník (0.34 g/100 g), but the composition of the essential oils is not conclusively different. The aroma of hop cones from both areas is identical. Their moderately intense scent can be described as a fine hop one with a background hint of fruit and citrus.

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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.

Cited by 4 publications

References 9 publications

Evaluation of variability of the content of alpha and beta acids in Czech bittering hop varieties (Humulus lupulus L.)

Evaluation of variability of the content of alpha and beta acids in Czech bittering hop varieties (Humulus lupulus L.)

Evaluation of Czech hop varieties (Humulus lupulus L.) in a dry area without irrigation

Evaluation of fine aroma Saaz Shine hop variety

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