In:
Ecology and Evolution, Wiley, Vol. 9, No. 3 ( 2019-02), p. 1070-1082
Abstract:
In freshwaters, algal species are exposed to different inorganic nitrogen (N i ) sources whose incorporation varies in biochemical energy demand. We hypothesized that due to the lesser energy requirement of ammonium ( )‐use, in contrast to nitrate ( )‐use, more energy remains for other metabolic processes, especially under CO 2 ‐ and phosphorus (P i ) limiting conditions. Therefore, we tested differences in cell characteristics of the green alga Chlamydomonas acidophila grown on or under covariation of CO 2 and P i ‐supply in order to determine limitations, in a full‐factorial design. As expected, results revealed higher carbon fixation rates for ‐grown cells compared to growth with under low CO 2 conditions. ‐grown cells accumulated more of the nine analyzed amino acids, especially under P i ‐limited conditions, compared to cells provided with . This is probably due to a slower protein synthesis in cells provided with . In contrast to our expectations, compared to ‐grown cells ‐grown cells had higher photosynthetic efficiency under P i ‐limitation. In conclusion, growth on the N i ‐source did not result in a clearly enhanced C i ‐assimilation, as it was highly dependent on P i and CO 2 conditions (replete or limited). Results are potentially connected to the fact that C. acidophila is able to use only CO 2 as its inorganic carbon (C i ) source.
Type of Medium:
Online Resource
ISSN:
2045-7758
,
2045-7758
DOI:
10.1002/ece3.2019.9.issue-3
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
2635675-2
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