The author thanks Susan Brawley, Steve Dudgeon, Val Gerard, and Janet Kuebler for their constructive criticism of this paper. This work was supported in part by NSF award OCE 8700763.
ENVIRONMENTAL EFFECTS ON ALGAL PHOTOSYNTHESIS: TEMPERATURE
Version of Record online: 27 OCT 2004
Journal of Phycology
Volume 27, Issue 1, pages 2–8, February 1991
How to Cite
Davison, I. R. (1991), ENVIRONMENTAL EFFECTS ON ALGAL PHOTOSYNTHESIS: TEMPERATURE. Journal of Phycology, 27: 2–8. doi: 10.1111/j.0022-3646.1991.00002.x
Question (Turpin): Is photosynthetic acclimation to temperature constrained when photosynthesis is nutrient limited?
Answer: The temperature acclimation of photosynthesis does not appear to have been studied under nutrient-limited conditions, although several studies have examined the interactions between nutrients, temperature, light, and growth rate. The strategies used by algae in temperature acclimation clearly do have a considerable cost, both in terms of energy and potentially limiting resources such as nitrogen. For example, the increase in Rubisco activities commonly associated with growth at low temperatures, and presumably due to an increase in the number of molecules of this enzyme, will require additional nitrogen for protein synthesis. Such a response may become impossible under severe nitrogen limitation. However, although acclimation to low temperatures requires an increased investment of nitrogen in enzyme protein, less nitrogen is required for photosynthetic pigments, which decrease at low temperatures. The opposite occurs at high temperature with enzyme activities being reduced, whereas pigment levels increase. The internal reallocation of nitrogen and fixed carbon between photosynthetic pigments and enzymes should reduce the requirement for additional resources for temperature acclimation. The extent to which this reallocation fully meets the requirements of, for example, additional enzyme synthetic at low temperature, requires further study. It is also necessary to consider the temperature acclimation of nonphotosynthetic aspects of metabolism (e.g. respiration), which may influence the resource budget of the plant.
- Issue online: 27 OCT 2004
- Version of Record online: 27 OCT 2004