INFLUENCE OF ULTRAVIOLET RADIATION ON AUXIN-CONTROLLED PLANT GROWTH

Ultraviolet irradiation (254 mμ) of plant test systems results in alterations in growth capacity which can be ascribed to UV-induced modifications of the ability of plant cells to respond to auxin. This conclusion was reached following study of auxin-requiring, auxin-sufficient, and auxin-surfeit test systems representing cell division, cell enlargement, and cell differentiation. The UV effect was usually reversible by subsequently presented near-visible or visible radiation.