Microbial community of hops (Humulus lupulus L.) and its impact on the quality of hop products

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F14864347%3A_____%2F21%3AN0000022" target="_blank" >RIV/14864347:_____/21:N0000022 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.actahort.org/books/1328/1328_15.htm" target="_blank" >https://www.actahort.org/books/1328/1328_15.htm</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.17660/ActaHortic.2021.1328.15" target="_blank" >10.17660/ActaHortic.2021.1328.15</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microbial community of hops (Humulus lupulus L.) and its impact on the quality of hop products

Popis výsledku v původním jazyce

During the growing seasons 2015-2019, the composition of the microbial community on the surface of leaves and cones of hop plants cultivated in the ‘Saaz’ hop growing area (Czech Republic) was studied. During the growing seasons, several leaf samplings were carried out between June to September. Cones were sampled immediately before harvesting. All species of bacteria were identified using the microbiological ID system Biolog (Biolog, Hayward, California). The fungi were identified at the genera level, using microscopic observations and the morphological appearance of the colonies on the dishes. In the bacterial community, Bacillus species (megatherium, idriensis, indicus, endophyticus) and Pantoea species (agglomerans, dispersa) were most frequently identified. Fungi of the genus Talaromyces, Penicillium, Alternaria, Fusarium, and Rhizopus were regularly identified on leaves and cones surfaces. Bacteria of Pantoea sp. have also been found in dry hops and even in hop pellets packed in barrier aluminium bags in a modified inert atmosphere. It has been found that bacteria of the genus Pantoea can metabolize hops carbohydrates at room temperature in the absence of oxygen while releasing carbon dioxide. This process is manifested externally by inflating and increasing the volume of bags with hop pellets. This causes logistical problems during handling and transport. This undesirable process can be effectively suppressed by reducing the amount of biological impurities in the harvested hops and storage of pellets in air-conditioned warehouses at temperatures up to +5°C.

Název v anglickém jazyce

Microbial community of hops (Humulus lupulus L.) and its impact on the quality of hop products

Popis výsledku anglicky

During the growing seasons 2015-2019, the composition of the microbial community on the surface of leaves and cones of hop plants cultivated in the ‘Saaz’ hop growing area (Czech Republic) was studied. During the growing seasons, several leaf samplings were carried out between June to September. Cones were sampled immediately before harvesting. All species of bacteria were identified using the microbiological ID system Biolog (Biolog, Hayward, California). The fungi were identified at the genera level, using microscopic observations and the morphological appearance of the colonies on the dishes. In the bacterial community, Bacillus species (megatherium, idriensis, indicus, endophyticus) and Pantoea species (agglomerans, dispersa) were most frequently identified. Fungi of the genus Talaromyces, Penicillium, Alternaria, Fusarium, and Rhizopus were regularly identified on leaves and cones surfaces. Bacteria of Pantoea sp. have also been found in dry hops and even in hop pellets packed in barrier aluminium bags in a modified inert atmosphere. It has been found that bacteria of the genus Pantoea can metabolize hops carbohydrates at room temperature in the absence of oxygen while releasing carbon dioxide. This process is manifested externally by inflating and increasing the volume of bags with hop pellets. This causes logistical problems during handling and transport. This undesirable process can be effectively suppressed by reducing the amount of biological impurities in the harvested hops and storage of pellets in air-conditioned warehouses at temperatures up to +5°C.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

40106 - Agronomy, plant breeding and plant protection; (Agricultural biotechnology to be 4.4)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Acta Horticulturae 1328

ISBN

978-94-62613-25-6

ISSN

0567-7572

e-ISSN

2406-6168

Počet stran výsledku

6

Strana od-do

109-114

Název nakladatele

International Society for Horticultural Science

Místo vydání

Leuven

Místo konání akce

Stuttgart

Datum konání akce

8. 3. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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