Photosynthetica 1997, 33(13):401-408 | DOI: 10.1023/A:1006816202324

Influence of supplemental UV-B radiation on photosynthetic characteristics of rice plants

Navin Kumar Ambasht1, Madhoolika Agrawal1
1 Ecology Research Laboratory, Botany Department, Banaras Hindu University, Varanasi, India

In a field experiment with rice (Oryza sativa L. cv. Saket 4) grown under ambient and supplemental ultraviolet-B (UV-B) radiation at 20 % ozone depletion, differences in gas exchange, concentrations of photosynthetic pigments, anthocyanins and flavonoids, biomass accumulation, catalase and peroxidase activities, and contents of ascorbic acid and phenol were determined. Decline in photosynthesis was associated with reductions in stomatal conductance and concentrations of photosynthetic pigments. Enhanced UV-B radiation (eUV-B) increased the contents of flavonoid and phenolic compounds in leaves. Peroxidase activity increased and catalase activity was always lower at eUV-B. The total plant biomass decreased at eUV-B.

Additional key words: biomass; carotenoids; catalase; chlorophyll; flavonoids; Oryza sativa; peroxidase; phenols; stomatal conductance; transpiration rate

Prepublished online: January 1, 1998; Published: September 1, 1997  Show citation

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Kumar Ambasht, N., & Agrawal, M. (1997). Influence of supplemental UV-B radiation on photosynthetic characteristics of rice plants. Photosynthetica, 34(3), 401-408. doi: 10.1023/A:1006816202324
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