ibclogo XVI International Botanical Congess

Abstract Number: 3051
Poster No. = 1599


EFFECTS OF ULTRAVIOLETS RADIATION ON SOME MICROALGAE


H. Nagashima, K. Takahashi, N. Shimada and Y. Inoue Science University of Tokyo, Noda, Chiba 278-8510, Japan


UV-B radiation (optimum 314 nm) causes the decrease of growth@rate and photosynthetic oxygen evolution of the algae. Two cyanobacteria, Synechococcus leopoliensis, Synechocystis sp. are the most stable for the UV-B radiation. Green algae, Chlorella vulgaris, C. sorokiniana, Dunaliella tertiolecta, Chlamydomonas reinhardtii, and red algae, Cyanidium caldarium, Galdieria sulphuraria, Cyanidioschyzon merolae are less tolerant for the radiation. UV-C radiation (optimum 254 nm) also causes the decrease of the growth rate and photosynthetic oxygen evolution of the algae. S. leopoliensis, Synechocystis sp., C. vulgaris, and C. sorokiniana are more stable than other algae for the UV-C radiation. In general, UV-C radiation is more damageable than UV-B radiation on the microalgae.

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