Dormancy and post-harvest maturation of malt barley (Hordeum vulgare) caryopses
2000
Hradilik, J. | Fiserova, H. | Hudeova, M. | Reinoehl, V. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic)) | Psota, V.
Dormancy and process of post-harvest maturation of caryopses was studied in the Akcent and Krona malt barley varieties. Using the index and rate of germination it was possible to differentiate the Akcent and Krona varieties immediately after harvest and also during post-harvest maturation. Caryopsis dormancy was always higher in Krona than in Akcent. In the stage of milk ripeness, when the caryopsis is the most sensitive to weather effects, the differences in the content of abscisic acid (ABA) were the biggest, corresponding with the assumption that the ABA content is higher in a cooler and more humid climate when more dormant caryopses are formed. The total content of phenolic substances was the highest in 1997 and contributed to the level of caryopsis dormancy. Indolyl-3-acetic acid and the majority of cytokinins participate particularly in the regulating processes associated with caryopsis filling, their content rapidly declining after reaching maturity.
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