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EFFECTS OF TEMPERATURE ON GROWTH, LIGHT ABSORPTION, AND QUANTUM YIELD IN DUNALIELLA TERTIOLECTA (CHLOROPHYCEAE) 1
Author(s) -
Sosik Heidi M.,
Mitchell B. Greg
Publication year - 1994
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.0022-3646.1994.00833.x
Subject(s) - photosynthesis , chlorophyceae , biology , pigment , chlorophyll a , photosynthetic pigment , absorption (acoustics) , chlorophyll , phytoplankton , nutrient , botany , algae , growth rate , intracellular , quantum yield , dunaliella , chlorophyta , biophysics , biochemistry , ecology , chemistry , physics , optics , geometry , organic chemistry , mathematics , fluorescence
The effects of growth temperature on the marine chlorophyte Dunaliella tertiolecta Butcher were studied to provide a more mechanistic understanding of the role of environmental factors in regulating bio‐optical properties of phytoplankton. Specific attention was focused on quantities that are relevant for modeling of growth and photosynthesis. Characteristics including chlorophyll a (chl z)‐specific light absorption (a* ph (λ)), C:chl a ratio, and quantum yield for growth (φ μ ) varied as functions of temperature under conditions of excess light and nutrients. As temperature increased over the range examined (12°‐28°C), intracellular concentrations of chl a increased by a factor of 2 and a* ph (λ) values decreased by more than 50% at blue to green wavelengths. The lower values of a* ph (λ) were due to both a decrease in the abundance of accessory pigments relative to chl a and an increase in pigment package effects arising from higher intracellular pigment concentrations. Intracellular pigment concentration increased as a consequence of higher cellular pigment quotas combined with lower cell volume. At high growth temperatures, slightly more light was absorbed on a per‐cell‐C basis, but the dramatic increases in growth rate from μ= 0.5 d −1 at 12° C to μ= 2.2 d −1 at 28°C were primarily due to an increase in φ μ (0.015–0.041 mol C (mol quanta) −1 ). By comparison with previous work on this species, we conclude the effects of temperature on a* ph (λ) and φ μ are comparable to those observed for light and nutrient limitation. Patterns of variability in a* ph (λ)and φ μ as a function of growth rate at different temperatures are similar to those previously documented for this species grown at the same irradiance but under a range of nitrogen‐limited conditions. These results are discussed in the context of implications for bio‐optical modeling of aquatic primary production by phytoplankton.