PJB-2018-560
Evaluation and comparison of photosynthesis models in fitting light-response curves of photosynthesis and estimating photosynthetic parameters in four rice (Oryza sativa L.) cultivars
Zi-Piao Ye
Abstract
To fit the light-response curves of photosynthesis of plants and estimate their photosynthetic parameters, four parameters were used in the non-rectangular hyperbolic model (Model 1), i.e. initial slope of light-response curve (¦Á), maximum net photosynthetic rate (Pnmax), convexity (¦È) and dark respiration rate (Rd). Another light-response model of photosynthesis developed by Ye et al. (Model 2) used similar parameters, i.e. ¦Á, photoinhibition coefficient (¦Â), saturated coefficient (¦Ã) and Rd to characterize the decline of photosynthetic rates above the light saturation point for four rice (Oryza sativa L.) cultivars (i.e. JR1326, Ganxiangyou1326, JR3015 and Ganxiangyou3015). Results indicated that with the decrease of CO2 assimilation rates at high light intensities the light-response curves of photosynthesis fitted by Model 1 significantly differed from observations for JR1326, JR3015 and Ganxiangyou3015. Moreover, Model 1 significantly underestimated light compensation point (Ic) and Rd for JR1326 and Ganxiangyou3015. In addition, Model 1 significantly overestimated Pnmax for Ganxiangyou1326 and JR3015 and slightly underestimated Pnmax for JR1326 and Ganxiangyou3015, whereas Model 2 described light-response curves of photosynthesis and estimated photosynthetic parameters with great accuracy for these rice cultivars. As a more precise tool, Model 2 deserves high recommendation as an operational model for elucidation of photosynthetic and physiological mechanisms of rice responses to irradiance and for theoretical investigations in rice eco-physiology.
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