Specific features of root aerenchyma formation in Sium latifoliun L. (Apiaceae)

Types of aerenchyma formation in adventive roots of wild plant S. latifolium L. have been described for the first time. Specific cell divisions and patterns of cell growth in the inner and outer root cortex at the initial stages of aerenchyma formation were highlighted in detail. Destructive processes in cells that occurred under aerenchyma formation were considered in the view of known stages of programmed cell death in plants.