Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation
This paper evaluates the influence of genotype on the photosynthetic activity of hops in the period critical for generating yield. Results over three years from measuring the photosynthesis rate statistically show an increase in the photosynthetic activity of hop plants in the flowering stage. The a...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Czech Academy of Agricultural Sciences
2011-06-01
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| Series: | Plant, Soil and Environment |
| Subjects: | |
| Online Access: | https://pse.agriculturejournals.cz/artkey/pse-201106-0004_photosynthetic-activity-of-selected-genotypes-of-hops-humulus-lupulus-l-in-critical-periods-for-yield-format.php |
| _version_ | 1797898312418852864 |
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| author | J. Pokorný J. Pulkrábek P. Štranc D. Bečka |
| author_facet | J. Pokorný J. Pulkrábek P. Štranc D. Bečka |
| author_sort | J. Pokorný |
| collection | DOAJ |
| description | This paper evaluates the influence of genotype on the photosynthetic activity of hops in the period critical for generating yield. Results over three years from measuring the photosynthesis rate statistically show an increase in the photosynthetic activity of hop plants in the flowering stage. The average photosynthetic rates from measurements on the second date (BBA 65) in the years 2007, 2008, and 2009 increased by 17.9%, 45.6%, and 49.2%, respectively. Different photosynthesis curve trends during the final stage of ontogenesis of the plants indicate the maturity level of each hop genotype. As regards the genotypes for which photosynthesis did not reduce significantly, it may be assumed that such plants had not reached technical maturity. The results from the three-year study also show that any promising genotype, with respect to the photosynthesis rate and yield, is the result of breeding of new varieties with greater resistance to drought and high temperatures. Very good results in photosynthetic activity were reached by the new varieties exhibiting high yield and a similar chemical composition to Saaz hop and those sharing the same origins to Saaz, showing a higher content of bitter substances. In 2008 and 2009, all three new forms reached yield levels of 2.35 to 3.12 t/ha of dry hops. |
| first_indexed | 2024-04-10T08:11:22Z |
| format | Article |
| id | doaj.art-ed431eecb5df4ebd8787f7cc077fe3a9 |
| institution | Directory Open Access Journal |
| issn | 1214-1178 1805-9368 |
| language | English |
| last_indexed | 2024-04-10T08:11:22Z |
| publishDate | 2011-06-01 |
| publisher | Czech Academy of Agricultural Sciences |
| record_format | Article |
| series | Plant, Soil and Environment |
| spelling | doaj.art-ed431eecb5df4ebd8787f7cc077fe3a92023-02-23T03:45:45ZengCzech Academy of Agricultural SciencesPlant, Soil and Environment1214-11781805-93682011-06-0157626427010.17221/30/2011-PSEpse-201106-0004Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formationJ. Pokorný0J. Pulkrábek1P. Štranc2D. Bečka3Department of Crop Production, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech RepublicDepartment of Crop Production, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech RepublicDepartment of Crop Production, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech RepublicDepartment of Crop Production, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech RepublicThis paper evaluates the influence of genotype on the photosynthetic activity of hops in the period critical for generating yield. Results over three years from measuring the photosynthesis rate statistically show an increase in the photosynthetic activity of hop plants in the flowering stage. The average photosynthetic rates from measurements on the second date (BBA 65) in the years 2007, 2008, and 2009 increased by 17.9%, 45.6%, and 49.2%, respectively. Different photosynthesis curve trends during the final stage of ontogenesis of the plants indicate the maturity level of each hop genotype. As regards the genotypes for which photosynthesis did not reduce significantly, it may be assumed that such plants had not reached technical maturity. The results from the three-year study also show that any promising genotype, with respect to the photosynthesis rate and yield, is the result of breeding of new varieties with greater resistance to drought and high temperatures. Very good results in photosynthetic activity were reached by the new varieties exhibiting high yield and a similar chemical composition to Saaz hop and those sharing the same origins to Saaz, showing a higher content of bitter substances. In 2008 and 2009, all three new forms reached yield levels of 2.35 to 3.12 t/ha of dry hops.https://pse.agriculturejournals.cz/artkey/pse-201106-0004_photosynthetic-activity-of-selected-genotypes-of-hops-humulus-lupulus-l-in-critical-periods-for-yield-format.phphopsphotosynthesis ratevarietieshop cone yield |
| spellingShingle | J. Pokorný J. Pulkrábek P. Štranc D. Bečka Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation Plant, Soil and Environment hops photosynthesis rate varieties hop cone yield |
| title | Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation |
| title_full | Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation |
| title_fullStr | Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation |
| title_full_unstemmed | Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation |
| title_short | Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation |
| title_sort | photosynthetic activity of selected genotypes of hops humulus lupulus l in critical periods for yield formation |
| topic | hops photosynthesis rate varieties hop cone yield |
| url | https://pse.agriculturejournals.cz/artkey/pse-201106-0004_photosynthetic-activity-of-selected-genotypes-of-hops-humulus-lupulus-l-in-critical-periods-for-yield-format.php |
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