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Elevated CO2 increases shoot growth but not root growth and C:N:P stoichiometry of Suaeda aralocaspica plants

Abstract

The purpose of the current study was to investigate the eco-physiological responses, in terms of growth and C:N:P stoichiometry of plants cultured from dimorphic seeds of a single-cell C4 annual Suaeda aralocaspica (Bunge) Freitag and Schütze under elevated CO2. A climatic chamber experiment was conducted to examine the effects of ambient (720 µg/L) and CO2-enriched (1440 µg/L) treatments on these responses in S. aralocaspica at vegetative and reproductive stages in 2012. Result showed that elevated CO2 significantly increased shoot dry weight, but decreased N:P ratio at both growth stages. Plants grown from dimorphic seeds did not exhibit significant differences in growth and C:N:P stoichiometric characteristics. The transition from vegetation to reproductive stage significantly increased shoot:root ratio, N and P contents, but decreased C:N, C:P and N:P ratios, and did not affect shoot dry weight. Moreover, our results indicate that the changes in N:P and C:N ratios between ambient and elevated CO2 are mainly caused by the decrease of N content under elevated CO2. These results provide an insight into nutritional metabolism of single-cell C4 plants under climate change.

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Acknowledgements

This research was supported by the Strategic Priority Research Program of Chinese Academy of Sciences (XDA2003010302), the National Natural Science Foundation of China (32171514) and the State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences (E1510107).

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Correspondence to Lei Wang.

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Wang, L., Fan, L., Jiang, L. et al. Elevated CO2 increases shoot growth but not root growth and C:N:P stoichiometry of Suaeda aralocaspica plants. J. Arid Land 13, 1155–1162 (2021). https://doi.org/10.1007/s40333-021-0025-1

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  • DOI: https://doi.org/10.1007/s40333-021-0025-1

Keywords

  • biomass
  • CO2 elevation
  • C:N:P stoichiometry
  • seed heteromorphism
  • Suaeda aralocaspica