Record Details
Physiological Response of Crocosphaera watsonii to Enhanced and Fluctuating Carbon Dioxide Conditions
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Physiological Response of Crocosphaera watsonii to Enhanced and Fluctuating Carbon Dioxide Conditions |
| Names |
Gradoville, Mary R.
(creator) White, Angelicque E. (creator) Letelier, Ricardo M. (creator) |
| Date Issued | 2014-10-24 (iso8601) |
| Note | This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by the Public Library of Science. The published article can be found at: http://www.plosone.org/. |
| Abstract | We investigated the effects of elevated pCO₂ on cultures of the unicellular N₂-fixing cyanobacterium Crocosphaera watsonii WH8501. Using CO₂-enriched air, cultures grown in batch mode under high light intensity were exposed to initial conditions approximating current atmospheric CO₂ concentrations (~400 ppm) as well as CO₂ levels corresponding to low- and high-end predictions for the year 2100 (~750 and 1000 ppm). Following acclimation to CO₂ levels, the concentrations of particulate carbon (PC), particulate nitrogen (PN), and cells were measured over the diurnal cycle for a six-day period spanning exponential and early stationary growth phases. High rates of photosynthesis and respiration resulted in biologically induced pCO₂ fluctuations in all treatments. Despite this observed pCO₂ variability, and consistent with previous experiments conducted under stable pCO₂ conditions, we observed that elevated mean pCO₂ enhanced rates of PC production, PN production, and growth. During exponential growth phase, rates of PC and PN production increased by ~1.2- and ~1.5-fold in the mid- and high-CO₂ treatments, respectively, when compared to the low-CO₂ treatment. Elevated pCO₂ also enhanced PC and PN production rates during early stationary growth phase. In all treatments, PC and PN cellular content displayed a strong diurnal rhythm, with particulate C:N molar ratios reaching a high of 22:1 in the light and a low of 5.5:1 in the dark. The pCO₂ enhancement of metabolic rates persisted despite pCO₂ variability, suggesting a consistent positive response of Crocosphaera to elevated and fluctuating pCO₂ conditions. |
| Genre | Article |
| Access Condition | http://creativecommons.org/licenses/by/3.0/us/ |
| Identifier | Gradoville, M. R., White, A. E., Letelier, R. M. (2014). Physiological Response of Crocosphaera watsonii to Enhanced and Fluctuating Carbon Dioxide Conditions. PLoS ONE, 9(10), e110660. doi:10.1371/journal.pone.0110660 |
