PHOTOMORPHOGENESIS AND PHYTOHORMONES

There are numerous reports of interactions between light and phytohorm ones. However, the exact nature of this interaction is not well unders tood, This article considers the possible roles played in the light si gnal transduction chain by four phytohormones (auxin, abscisic acid, g ibberellins and cytokinins), As the involvement of phytohormones in th is signalling mechanism is controversial, the major arguments in the d ebate are reported, including recently published results based on gene tic, biochemical and physiological approaches.