Abstract
Chlorophyll index and leaf nitrogen status (SPAD value) was incorporated into the nonrectangular hyperbola (NRH) equation for photosynthetic light-response (PLR) curve to establish a modified NRH equation to overcome the parameter variation. Ten PLR curves measured on rice leaves with different SPAD values were collected from pot experiments with different nitrogen (N) dosages. The coefficients of initial slope of the PLR curve and the maximum net photosynthetic rate in NRH equation increased linearly with the increase of leaf SPAD. The modified NRH equation was established by multiplying a linear SPAD-based adjustment factor with the NRH equation. It was sufficient in describing the PLR curves with unified coefficients for rice leaf with different SPAD values. SPAD value, as the indicator of leaf N status, could be used for modification of NRH equation to overcome the shortcoming of large coefficient variations between individual leaves with different N status. The performance of the SPAD-modified NRH equation should be further validated by data collected from different kinds of plants growing under different environments.
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Abbreviations
- AE:
-
absolute error
- Chl:
-
chlorophyll
- N:
-
nitrogen
- N1, N2:
-
the nitrogen fertilization rates, namely 300 (N1) and 200 (N2) kg(N) ha−1
- P N :
-
net photosynthetic rate
- P Nmax :
-
maximum net photosynthetic rate
- PLR:
-
photosynthetic light response
- PPFD:
-
photosynthetically photon flux density
- R D :
-
dark respiration
- RMSE:
-
root mean square error
- α:
-
initial slope of the PLR curve
- β:
-
parameter introduced by incorporating the SPAD-based factor into NRH equation
- Θ:
-
parameter of the convexity of the PLR curve
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Acknowledgements: The research was financially supported by the National Natural Science Foundation of China (No. 51209065; 51179051), by the Fundamental Research Funds for the Central Universities (No. 2012B07514), and Qinglan Project of Jiangsu Province and Advanced Science and Technology Innovation Team in Colleges and Universities in Jiangsu Province.
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Xu, J.Z., Yu, Y.M., Peng, S.Z. et al. A modified nonrectangular hyperbola equation for photosynthetic light-response curves of leaves with different nitrogen status. Photosynthetica 52, 117–123 (2014). https://doi.org/10.1007/s11099-014-0011-3
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DOI: https://doi.org/10.1007/s11099-014-0011-3