Pathogenic metabolites in barley caryopses and their effect on quality of malting barley and malt
2011
Benesova, K., Vyzkumny Ustav Pivovarsky a Sladarsky, Brno (Czech Republic) | Psota, V., Vyzkumny Ustav Pivovarsky a Sladarsky, Brno (Czech Republic) | Mikulikova, R., Vyzkumny Ustav Pivovarsky a Sladarsky, Brno (Czech Republic) | Belakova, S., Vyzkumny Ustav Pivovarsky a Sladarsky, Brno (Czech Republic) | Svoboda, Z., Vyzkumny Ustav Pivovarsky a Sladarsky, Brno (Czech Republic)
In 2008-2010, 69 samples of hulled and hulless barley varieties and lines and malt made from them were analyzed. Activity of enzymes involved in the plant defense response to the pathogenic attack, chitinase and 1,3-beta-glucanase, was monitored. In addition, the polysaccharide galactomanan present in the cell walls of filamentous micromycetes was studied using the agglutination EPS test. Beta-glucan content was studied in non-malted barley caryopses and in wort. Simultaneously, gushing potential of barley and malt, and content of dimethyl sulfide precursors in malt were studied. The activity of 1,3-beta-glucanase in malt is mostly a result of the germination process. Therefore, it is not a result of a pathogenic assault. Most likely, contamination of caryopsis does not principally affect the level of beta-glucan. On the contrary, the levels of gushing and dimethyl sulfide precursors in malt are markedly associated with the contamination of caryopses with filamentous micromycetes.
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