Photosynthetica 1997, 33(13):465-471 | DOI: 10.1023/A:1006828505050

Influence of ultraviolet-B radiation on photosynthetic and biochemical characteristics of a mangrove Rhizophora apiculata

P. Moorthy1, K. Kathiresan1
1 Centre of Advanced Study in Marine Biology (Annamalai University), Parangipettai, Tamil nadu, India

Changes in photosynthesis and biochemical constituents were studied in R. apiculata seedlings grown under solar and solar enhanced UV-B radiation, equivalent to 10, 20, 30, and 40 % stratospheric ozone depletion. The seedlings grown under 10 % UV-B radiation showed an increase of 45 % net photosynthetic rate (PN) and 47 % stomatal conductance, while seedlings grown under 40 % UV-B radiation exhibited a decrease of 59 % PN with simultaneous elevation of 73 % intercellular CO2 concentration. Effects of UV-B on contents of lipids, saccharides, amino acids, and proteins were significant only at high doses of UV-B radiation. The concentration of anthocyanin was reduced with increasing doses of UV-B. The reverse was true with phenols and flavonoids.

Additional key words: anthocyanins; carotenoids; chlorophyll; flavonoids; intercellular CO2 concentration; net photosynthetic rate; phenols; proteins; saccharides; stomatal conductance

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

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Moorthy, P., & Kathiresan, K. (1997). Influence of ultraviolet-B radiation on photosynthetic and biochemical characteristics of a mangrove Rhizophora apiculata. Photosynthetica, 34(3), 465-471. doi: 10.1023/A:1006828505050
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