Photosynthetic efficiency, cell volume, and elemental stoichiometric ratios in Thalassirosira weissflogii under phosphorus limitation

Sheng Liu; Zhiling Guo; Tao Li; Hui Huang; Senjie Lin

doi:10.1007/s00343-011-0224-2

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Photosynthetic efficiency, cell volume, and elemental stoichiometric ratios in Thalassirosira weissflogii under phosphorus limitation

Updated：2023-05-16

- Photosynthetic efficiency, cell volume, and elemental stoichiometric ratios in Thalassirosira weissflogii under phosphorus limitation
- Journal of Oceanology and Limnology Vol. 29, Issue 5, Pages: 1048-1056(2011)
- Affiliations：
  
  1. Key Laboratory of Marine Bio-resources Sustainable Utilization South China Sea Institute of Oceanology Chinese Academy of Sciences
  2. Graduate University of Chinese Academy of Sciences
  3. Tropical Marine Biological Research Station in Hainan Chinese Academy of Sciences
  4. Department of Marine Sciences University of Connecticut
- Author bio：
- Funds：
- DOI：10.1007/s00343-011-0224-2
  CLC：
- Online First：08 August 2011，
  
  Published：2011
- Accepted：
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Liu, S., Guo, Z., Li, T. et al. Photosynthetic efficiency, cell volume, and elemental stoichiometric ratios in Thalassirosira weissflogii under phosphorus limitation., Chin. J. Ocean. Limnol. 29, 1048–1056 (2011). https://doi.org/10.1007/s00343-011-0224-2
DOI：

Liu, S., Guo, Z., Li, T. et al. Photosynthetic efficiency, cell volume, and elemental stoichiometric ratios in Thalassirosira weissflogii under phosphorus limitation., Chin. J. Ocean. Limnol. 29, 1048–1056 (2011). https://doi.org/10.1007/s00343-011-0224-2 DOI：

摘要

Abstract

Nutrient limitation is known to inhibit growth and metabolism and to alter elemental stoichiometric ratios in phytoplankton. In this study

physiological changes in Thalassirosira weissflogii were measured under different dissolved inorganic phosphate (DIP) regimes in semi-continuous cultures to revisit the utility of the Redfield ratio for assessing nutrient limitation. The results showed that cell size increased with decreasing DIP availability. In the P-depleted treatment (f/2-P) the cell size was 1.48 times larger than that in the P-limited (f/100) treatment and 2.67 times larger than that in the P-saturated treatment (f/2 and f/10). The fucoxanthin to chlorophyll a ratio (Fuco/chl a) was relatively stable (about 0.3) in P-saturated cultures and was 10 times higher than that in P-limited and P-depleted cultures. During the experimental period

the photosynthetic efficiency index

ΔF/F m ′

was relatively stable at ∼0.50 in the P-saturated cultures

but quickly declined with decreasing DIP availability. Although cellular P content showed a significant difference between the P-saturated culture (1.6 pg/cell) and the P-limited culture (0.7 pg/cell)

the N/P ratio in T. weissflogii did not show a trend with DIP availability and fluctuated slightly around 25. Our results suggest that cell division in T. weissflogii is not strictly size-gated but is probably regulated by a biochemical

and hence

an elemental stoichiometric ratio threshold

and that deviation of the cellular N/P ratio from the Redfield ratio is not a reliable indicator of algal nutrient stress.

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