Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation

Pokorný, J.; Pulkrábek, J.; Štranc, P.; Bečka, D.

doi:10.17221/30/2011-pse

Cited by 6 publications

(3 citation statements)

References 15 publications

(15 reference statements)

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“…In the present study, the highest yielding year was 2014 because of the favourable climatic conditions (without extreme heat events) registered from mid-June to late July: average temperatures between 20 and 22°C and more than 210 mm of total rainfall. In that period all cultivars were developing the reproductive stages of blooming and cone formation, which are fundamental phenological phases in determining final yield and production quality (Kucera and Krofta, 2009;Pokorný et al, 2011;Potop, 2014). This is confirmed by our observation during cultivars reproductive growth occurred in the following driest year.…”

Section: Yieldmentioning

confidence: 99%

Agronomic performance and beer quality assessment of twenty hop cultivars grown in Central Italy

et al. 2016

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Hop market and beer industry have always been of secondary relevance in Italy as compared to grape and wine sector. Hence, hop cultivars and the information for growing hops have been generated almost entirely from the major hop production countries. Identifying cultivars that perform well in Mediterranean environments is therefore essential to successfully start hop cultivation and breeding activity in this new growing region. To evaluate the intraspecific diversity of hop in Central Italy, 20 female hop genotypes with different origin were screened during three growing seasons (2013-2015) in an experimental hop yard. Cones yield, plant height and crop phenology were evaluated to determine which cultivars were best suited to the Mediterranean climate. Moreover, given the rising interest for the development of local beers with distinguishing aroma, a sensory analysis was performed and beers flavoured with locally produced and imported cones were compared. A significant diversity among cultivars was found for all parameters investigated. The results indicated that weather condition during flowering and development of cones markedly affected yield and plant height. Cones yield was negatively correlated with thermal time (r=–0.5, P<0.05) to harvest and positively with plant height (r=0.56, P<0.05). Cascade, Hallertauer Magnum, Hersbrucker Spat and Yeoman showed the best adaptability to the Mediterranean growing conditions as they were the top-performing cultivars across the three years. Sensory analysis evidenced the importance of cultivar selection as determining factor for flavouring properties of beers. In general, results showed that the origin of cones strongly affected the mouth feel of beers. More complex and appreciated aroma profiles were identified for beers flavoured with local cones than those hopped with commercial products.

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Section: Yieldmentioning

confidence: 99%

Agronomic performance and beer quality assessment of twenty hop cultivars grown in Central Italy

et al. 2016

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“…The lowest P n was measured in the 21-29 BBCH phase, while maximum P n was measured in the 81-89 BBCH phase. Pokorný et al (2011) stated that the Premiant, Saaz hop (Os. No.…”

Section: Discussionmentioning

confidence: 99%

Effect of ontogeny, heterophylly and leaf position on the gas exchange of the hop plant

2014

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This paper evaluates the influence of ontogeny and the position of bine and offshoot leaves on the rate of photosynthesis (P n ), transpiration (E) and stomatal conductance (g s ) in hop plants. In the ontogeny influencing P n , E and g s among hops. The highest P n was measured in phase 81-89 BBCH and E and g s in phase 61-69 BBCH. The P n increased over the course of ontogeny from the 1 st to 3 rd level of the hop plants. From the 61 BBCH phase, the leaves of the first and second level achieved a photosynthetic maturity and P n value no longer increased. The third-level leaves achieved photosynthetic maturity from the 81 BBCH phase. Higher E was measured in the upper parts of the hop plant. P n and E were higher in the bine leaves in the third level of the hop plant over the entire course of the vegetation period. In the first and second level of the hop plant, higher values of P n were measured in the offshoot leaves. Differences in g s were not noteworthy among the leaf types. Results show that a significant factor affecting the differences in P n and E in hops is the age of the leaves.

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“…The recent craft beer expansion therefore not only triggered new microbreweries but also boosted the demand for aromatic hops globally 15 , 16 . Although linkages between hop production and climate variation have been reported at local to regional scales 9 , 10 , 17 – 27 , relatively little is known about the possible, direct and indirect, effects of a predicted warmer and drier climate on the yield and alpha content of hops.…”

Section: Introductionmentioning

confidence: 99%

Climate-induced decline in the quality and quantity of European hops calls for immediate adaptation measures

Mozny,

Trnka,

Vlach

et al. 2023

Nat Commun

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A recent rise in the global brewery sector has increased the demand for high-quality, late summer hops. The effects of ongoing and predicted climate change on the yield and aroma of hops, however, remain largely unknown. Here, we combine meteorological measurements and model projections to assess the climate sensitivity of the yield, alpha content and cone development of European hops between 1970 and 2050 CE, when temperature increases by 1.4 °C and precipitation decreases by 24 mm. Accounting for almost 90% of all hop-growing regions, our results from Germany, the Czech Republic and Slovenia show that hop ripening started approximately 20 days earlier, production declined by almost 0.2 t/ha/year, and the alpha content decreased by circa 0.6% when comparing data before and after 1994 CE. A predicted decline in hop yield and alpha content of 4–18% and 20–31% by 2050 CE, respectively, calls for immediate adaptation measures to stabilize an ever-growing global sector.

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Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation

Cited by 6 publications

References 15 publications

Agronomic performance and beer quality assessment of twenty hop cultivars grown in Central Italy

Agronomic performance and beer quality assessment of twenty hop cultivars grown in Central Italy

Effect of ontogeny, heterophylly and leaf position on the gas exchange of the hop plant

Climate-induced decline in the quality and quantity of European hops calls for immediate adaptation measures

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