期刊
JOURNAL OF PLANKTON RESEARCH
卷 39, 期 1, 页码 13-22出版社
OXFORD UNIV PRESS
DOI: 10.1093/plankt/fbw067
关键词
RuBisCO; specific growth rate; temperature; microalga; phytoplankton
资金
- Leverhulme International Network on planktonic mixotrophy [F00391V]
- EnAlgae
- Interreg IVB (NWE)
- EPSRC [EP/K014633/1] Funding Source: UKRI
- NERC [NE/J021008/1, NE/F003455/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K014633/1] Funding Source: researchfish
- Natural Environment Research Council [NE/F003455/1, NE/J021008/1] Funding Source: researchfish
Knowing the potential maximum photoautotrophic growth rate for planktonic primary producers is fundamental to our understanding of trophic and biogeochemical processes, and of importance in applied phycology. When day-integrated C-specific growth is considered over natural light: dark cycles, plausible RuBisCO activity (K-cat coupled with cellular RuBisCO content) caps growth to less than a few doubling per day. Prolonged periods of C-specific growth rates above ca. 1.3 d(-1) thus appear increasingly implausible. Discrepancies between RuBisCO-capped rates and reported microalgal-specific growth rates, including temperature-growth rate relationships, may be explained by transformational errors in growth rate determinations made by reference to cell counts or most often chlorophyll, or by extrapolations from short-term measurements. Coupled studies of enzyme activity and day-on-day C-specific growth rates are required to provide definitive evidence of high growth rates. It seems likely, however, that selective pressure to evolve a RuBisCO with a high Kcat (with a likely concomitant increase in Km for CO2) would be low, as other factors such as light limitation (developing during biomass growth due to self-shading), nutrient limitations, CO2 depletion and pH elevation, would all rapidly depress realized specific growth rates.
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