In a field experiment, seedlings that were only a few days old were exposed to increased UVB radiation during several weeks. The variable/maximum fluorescence was estimated using photosynthetic activity and chlorophyll a fluorescence. On carrot, beetroot, radish, and onion plants, UV-B had a significant effect on PS II activity. UV-B light has no effect on the PSII activity of radish plants, but it does enhance it by 50%. At the same time, the PSII activity reveals the impacts of UVB radiation on other plants such as carrot, onion, and beetroot. UVB sunlight damages certain plants, and they are unable to heal the damage. The lowering of PSII activity and the efficiency of Chl fluorescence induction kinetics reflect this. UVB radiation, on the other hand, had no or only a minor effect on PSI activity and the Fluorescence parameter. The findings show that UV-B radiation in the tropics region can considerably diminish photosynthetic activity in plants that cannot endure its effects while increasing it in plants that can tolerate it.
Author(S) Details
S. Janetta Nithia
Department of Botany, Sri Meenakshi Government Arts College for Women, Madurai, Tamil Nadu, India.
N. Shanthi
Department of Botany, Unit of Plant stress physiology, Pachaiyappa’s College, Chennai, Tamil Nadu, India.
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