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The effects of the exogenous growth regulators abscisic and gibberellic acids (ABA and GA3) on the activity of arginine (ADC) and ornithine decarboxylases (ODC) during dormancy breaking were studied in beech seed. During cold-stratification at 3°C, ADC and ODC activity increased rapidly starting from week 7 in embryo axes and week 8 in cotyledons. At 15°C, ADC activity was higher than ODC activity...
We analysed changes in AMP, ADP, and ATP concentrations and adenylate energy charge in Norway maple (Acer platanoides L.) and European beech (Fagus sylvatica L.) seeds during dormancy breaking (at 3 °C) and in the control variant at 15 °C. Values of the studied indicators in stratified beech seeds were generally higher at 15 °C, at least until germination (+3 °C). By contrast, in maple seeds, the...
We analysed changes in the activity of phosphofructokinase (PFK) and phosphoenolopyruvate carboxylase (PEPC), and in the glucose and sucrose contents of Norway maple seeds stratified at 3°C (dormancy broken) or treated at temperature 15°C (dormancy not broken). We found that changes in the activity of enzymes are not linear, and 2-3 stages may be distinguished. Dormancy breaking and seed germination...
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