Abstract
To investigate how bisulfite promotes photosynthesis, a pot experiment was conducted with rice (Oryza sativa L.) plants to determine Rubisco activity and content, and Rubisco activase (RCA) gene expression after spraying NaHSO3 on rice leaves. The NaHSO3 treatment promoted significantly net photosynthetic rate (P N), carboxylation efficiency, maximum carboxylation rate, ribulose-1,5-bisphosphate regeneration rate, initial Rubisco activity, and RCA protein and mRNA concentrations. Therefore, the NaHSO3 enhancement of P N could be directly attributed to induction of RCA gene expression both at the transcription and translation levels. Thus, the increased RCA regulated the initial Rubisco activity in vivo.
Abbreviations
- AQY:
-
apparent quantum yield
- CE:
-
carboxylation efficiency
- ELISA:
-
enzyme-linked immunosorbent assay
- C i :
-
intercellular CO2 concentration
- g s :
-
stomatal conductance
- Jmax :
-
RuBP regeneration rate
- P N :
-
net photosynthetic rate
- RCA:
-
Rubisco activase
- RCAL :
-
RCA large isoform
- RCAs :
-
RCA small isoform
- R D :
-
dark respiration rate
- RLS:
-
Rubisco large subunit
- R P :
-
photorespiration rate
- RSS:
-
Rubisco small subunit
- RuBP:
-
ribulose-1,5-bisphosphate
- Vcmax :
-
maximum carboxylation rate
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Acknowledgements: This work was supported by National Science and Technology Support Plan (2012BAC09B01) and National Natural Science Foundation (30971703 and 31171462).
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Chen, Y., Jin, J.H., Jiang, Q.S. et al. Sodium bisulfite enhances photosynthesis in rice by inducing Rubisco activase gene expression. Photosynthetica 52, 475–478 (2014). https://doi.org/10.1007/s11099-014-0044-7
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DOI: https://doi.org/10.1007/s11099-014-0044-7