Chronic Effects of Ultraviolet-B Radiation on Growth and Cell Volume of'Phaeodactylum tricornutum' (Bacillariophyceae)

摘要

Cultures of the temperate estuarine diatom, Phaeodactylum tricornutum Bohlin(NEPCC Clone 31), were grown under ambient intensities of ultraviolet-A radiation (UVAR), photosynthetically active radiation (PAR), and various intensities of ultraviolet-B radiation (UVBR; 290-320 nm). Growth rates and cell volumes were monitored for 36 d. UVBR decreased growth rates and increased cell volumes. Sensitivity of growth to UVBR increased with time. Growth rates of P. tricornutum decreased with increasing ratios of UVBR:UVAR + PAR.