“…Cells in HA treated roots also appeared more active in division, and this was more apparent in the lengthwise aspect. These results are consistent with those reported by Helanova and Sladky (1967), Linehan (1976), and Vaughan (1974), who reported that the promotion of the root growth by HA was due to both cell division and cell expansion. Gorovaya and Solocha ( 1971) also reported that HA stimulated cell division and increased the volume of the interphase nuclei of onion root tips.…”