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ABSTWCT: The time course of adaptation to changes in growth irradiance was studied in the marine diatom Thalassiosira weisflogij. Irradiance changes were from 72 to 593 uE m-2 S-' (L + H) and from 593 to 72 pE S-' (H + L). In steady state, high-light (HL) grown cells were characterized by low pigment contents and a low in vivoabsorbance. Light saturated photosynthesis, expressed on a per cell basis, was higher for low-light (LL) cells, but on a Chl a basis photosynthesis of HL cells was higher. PSU,, sizes were not significantly different for HL and LL cells. In both transient states the carbohydrate pool was most dynamic and responded fastest to a change in ~rradiance. It was concluded that the carbohydrate pool serves as an energy and carbon reservoir buffering the cells from changes in irradiance and allowing other cellular properties to adjust to the new situation. The timescales of changes in Chl a cell-' and photosynthetic activities differed considerably: by a factor of 3 in the L -, H transition and by a factor of 30 in the H + L transition. Irradiance transitions did not lead to marked changes in protein cell-'.

Physiological responses of a marine planktonic diatom to transitions in growth irradiance