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EFFECTS OF LIGHT INTENSITY AND TEMPERATURE INTERACTIONS ON GROWTH CHARACTERISTICS OF PHAEODACTYLUM TRICORNUTUM (BACILLARIOPHYCEAE) 1
Author(s) -
Fawley Marvin W.
Publication year - 1984
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1984.00067.x
Subject(s) - phaeodactylum tricornutum , biology , light intensity , cell division , carbon fixation , growth rate , chloroplast , luminous intensity , biophysics , vacuole , botany , photosynthesis , algae , cell , biochemistry , cytoplasm , optics , physics , geometry , mathematics , gene
Cell division rate, carbon fixation per cell, cell width and chloroplast length of Phaeodactylum tricornutum Bohlin were determined at 30 different combinations of light intensity and temperature. Division rate peaked at 23° C or less depending on light intensity. For each light intensity studied, carbon fixation increased directly with growth temperature from 14 to 25° C. The slope of this relationship was modified by light intensity. Cells grown at 23–25° C tended to be larger than those grown at lower temperatures, possibly due to increased carbon fixation per cell coupled with lower division rates. Chloroplasts were largest at a combination of temperatures above 21° C and low light intensities. This effect could cause cells to sink at a higher than normal rate due to reduced vacuole size and is presented as a possible mechanism affecting the distribution of P. tricornutum .