ChileanJAR

The effects of As⁺⁵ on root growth of Allium cepa L. was studied, including an analysis of root longitudinal growth, frequency of mitotic cells in the meristematic zone, and interphase duration of these proliferating cells. Additionally, the consequences of the presence of P⁺⁵ in the incubation solution containing As⁺⁵ , was also studied. As⁺⁵ induced a drastic fall in the longitudinal root growth and in the frequency of mitosis in the meristematic region, as weJl as an elongation of the interphase in these proliferating cells. The intensity of these effects is a function of As⁺⁵ concentration. The simultaneous presence of P⁺⁵ in the As⁺⁵ in the solutions used for root incubation, prevents the effects produced by As⁺⁵. This action depends on the (P) / (As) quotient.