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A new model for relationship between irradiance and the rate of photosynthesis in Oryza sativa

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The calculated maximum net photosynthetic rate (P N) at saturation irradiance (I m) of 1 314.13 µmol m−2 s−1 was 25.49 µmol(CO2) m−2 s−1, and intrinsic quantum yield at zero irradiance was 0.103. The results fitted by nonrectangular hyperbolic model, rectangular hyperbolic method, binomial regression method, and the new model were compared. The maximum P N values calculated by nonrectangular hyperbolic model and rectangular hyperbolic model were higher than the measured values, and the I m calculated by nonrectangular hyperbolic model and rectangular hyperbolic model were less than measured values. Results fitted by new model showed that the response curve of P N to I was nonlinear at low I for Oryza sativa, P N increased nonlinearly with I below saturation value. Above this value, P N decreased nonlinearly with I.

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Correspondence to Z.-P. Ye.

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Ye, ZP. A new model for relationship between irradiance and the rate of photosynthesis in Oryza sativa . Photosynthetica 45, 637–640 (2007).

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