Photosynthetica 2002, 40(1):85-89 | DOI: 10.1023/A:1020154526655

Effects of Enhanced Ultraviolet-B (280-320 nm) Radiation on Growth and Photosynthetic Activities in Aquatic Fern Azolla Microphylla Kaulf

M. Jayakumar1, M. Eyini1, K. Lingakumar1, G. Kulandaivelu1
1 School of Biological Sciences, Madurai Kamaraj University, Madurai, India

The effects of enhanced UV-B radiation on growth and photosynthetic activities were investigated in fronds of the aquatic fern Azolla microphylla Kaulf. The fronds were exposed to UV-B radiation intermittently once in 3 d during 12 d. Biomass and relative growth rate of UV-B treated Azolla plants and the heterocyst frequency of the UV-B treated symbiont decreased resulting in an increase in doubling time over the control. The doubling time was 3.08 d for control and 3.35 d for UV-B irradiated plants. Chl and carotenoid contents per unit fresh mass and photosystem 2 (PS2) activity also decreased under UV-B treatment. Measurements of photosynthetic activity in terms of fluorescence kinetics and PS2 mediated O2 evolution showed that the aquatic fern Azolla is sensitive to UV-B damage.

Additional key words: biomass; carotenoids; chlorophyll; doubling time; fluorescence induction; heterocyst; photosystem 2; relative growth rate

Published: March 1, 2002  Show citation

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Jayakumar, M., Eyini, M., Lingakumar, K., & Kulandaivelu, G. (2002). Effects of Enhanced Ultraviolet-B (280-320 nm) Radiation on Growth and Photosynthetic Activities in Aquatic Fern Azolla Microphylla Kaulf. Photosynthetica, 40(1), 85-89. doi: 10.1023/A:1020154526655
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