Impact of uv-b radiations on morphology of Ocimum and Mentha (family-Lamiaceae) by ascorbic acid

Ultraviolet-B radiation is an important component of the environment, acting as an ecophysiological factor with the potential to alter plant growth and photosynthesis. Plant response to UV-B is effectively regulated by photo protective mechanisms that dissipate excess radiation. At the morphological & physiological level these photo repair mechanisms and antioxidant responses mop up reactive oxygen species, UV-B screening compounds and adaptation in leaf morphology, stop UV-B from reaching the chloroplasts. These mechanisms contribute to a coordinated response to UVB, some of which can be enhanced by the UV-A portion of the photosynthetically active radiation.