Abstract
Ozone is the main photochemical oxidant that causes leaf damage in many plant species, thereby decreasing the productivity of crops and forests. Ozone produces reactive oxygen species suchas superoxide radicals and hydrogen peroxide, which induce phytohormones such as ethylene, salicylic acid and jasmonic acid. Phytohormones are required for plant growth, development and defense response. It is also known that phytohormones regulate the extent of leaf injury in ozone-fumigated plants. In recent years, responses to ozone have been studied using genetic-modified plants and mutants, which have aitered the hormone levels and signaling. From this researches, the role of phytohormones and the complexity of their signaling is being clarified. The present focused on the biosynthesis of phytohormones and their cross-talking effects in ozone-exposed plants.
