Dynamics and features of adaptive processes in juvenile terrestrial Sium latifolium L. plants to soil flooding for 10 days were studied. The results show consecutive activation of heat shock protein HSP70 synthesis, then alcohol dehydrogenase (ADH) synthesis – first in the roots and then in the leaves, and emergence of aerenchymatous adventitious roots after 2 days. The systemic induction and prolonged synthesis of the stress protein and anaerobic enzyme, the ability for rapid adventitious rooting, as well as the cooperation of the aerobic and anaerobic energetic processes in time and space are considered as important for flooding adaptation of the species.

Keywords: Sium latifolium, flooding, adaptation, heat shock protein 70, alcohol dehydrogenase, aerenchyma

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