The data on actin microfilament organization in roots of water-terrestrial plants Sium latifolium and Alisma plantago-aquatica are presented in the article. The main attention is paid to cells surrounding aerenchyma cavities in meristem and elongation zone of the roots. Some of these cells undergo degradation in the special way distinct from the same process in other plant species. Peculiarities of aerenchyma formation in roots of water-terrestrial S. latifolium and A. plantago-aquatica are noted. Regulation of actin microfilament activity is discussed as well as their involvement in the processes of growth and aerenchyma formation.

Keywords: cytoskeleton, actin microfilaments, water-terrestrial plants, aerenchyma

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