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The fluctuations in the level of endogenous growth regulators in seeds of acer pseudoplatanus in the course of stratification


, : The fluctuations in the level of endogenous growth regulators in seeds of acer pseudoplatanus in the course of stratification. Biologia Plantarum (Prague) 19(5): 321-330

In the course of cold stratification of A. pseudoplatanus L. fruits a statistically significant alternation occurs in their seeds of a rise and fall in the level of endogenous growth regulators. In the initial weeks the inhibitory effect slightly declines, or, on the contrary, the stimulatory effect slightly increases. In the middle phase of stratification a marked increase in inhibitions and reduction of stimulations appears, and towards the end of stratification the stimulatory effect of isolated substances in the individual biotests rises again, or their inhibition effect is decreased. No direct dependence was found between the decrease of the degree of dormancy and the drop of inhibitor, or increase of promotor levels. However, a certain analogy was observed between the time course of fluctuations in the level of growth regulators and the germination energy of the seeds investigated. An enhancement of the growth activity of the substances isolated (e.g., those of a gibberellin-like nature) in the last weeks of stratification can already be considered as the result of the release of fruits from dormancy.

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