Evaluation of Models for Describing Photosynthetic Light–Response Curves and Estimating Parameters in Rice Leaves at Various Canopy Positions
The photosynthetic light–response (<i>P</i><sub>n</sub>/<i>I</i>) curve is a crucial tool for accurately estimating photosynthetic parameters. However, selecting the most suitable model from numerous available light–response models is still difficult because of th...
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MDPI AG
2025-01-01
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| Series: | Agronomy |
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| author | Yangjie Guo Yuping Lv |
| author_facet | Yangjie Guo Yuping Lv |
| author_sort | Yangjie Guo |
| collection | DOAJ |
| description | The photosynthetic light–response (<i>P</i><sub>n</sub>/<i>I</i>) curve is a crucial tool for accurately estimating photosynthetic parameters. However, selecting the most suitable model from numerous available light–response models is still difficult because of the complex canopy structure. This study aimed to evaluate the performance of different models, including the rectangular hyperbolic model (RHM), non-rectangular hyperbolic model (NRHM), exponential model (EM), and modified rectangular hyperbolic model (MRHM), in modeling <i>P</i><sub>n</sub>/<i>I</i> curves and estimating photosynthetic parameters for rice leaves at various canopy positions. The results showed that the NRHM demonstrated the highest accuracy, and the EM was identified as the most ideal in estimating <i>P</i><sub>n</sub>. The RHM consistently overestimated the maximum net photosynthetic rate (<i>P</i><sub>nmax</sub>), apparent quantum efficiency (<i>α</i>), dark respiration rate (<i>R</i><sub>d</sub>), and light compensation point (<i>LCP</i>) while underestimating light saturation point (<i>LSP</i>) for all rice leaves. The NRHM overestimated <i>P</i><sub>nmax</sub>, underestimated <i>LSP,</i> and accurately estimated <i>LCP</i> for all leaves, and overestimated <i>α</i> and <i>R</i><sub>d</sub> for top leaves but performed well for lower leaves. The EM excelled in estimating <i>P</i><sub>nmax</sub> and <i>LSP</i> for all leaves and performed well in estimating <i>α</i> for the top third and fourth leaves, <i>R</i><sub>d</sub> for the top four leaves, and <i>LCP</i> for the top six leaves. The MRHM was effective in estimating <i>P</i><sub>nmax</sub> but consistently overestimated <i>α</i>, <i>R</i><sub>d</sub>, and <i>LSP</i> for all leaves. |
| format | Article |
| id | doaj-art-20703181696a440c8d25704a0fc939fc |
| institution | Kabale University |
| issn | 2073-4395 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agronomy |
| spelling | doaj-art-20703181696a440c8d25704a0fc939fc2025-01-24T13:16:49ZengMDPI AGAgronomy2073-43952025-01-0115112510.3390/agronomy15010125Evaluation of Models for Describing Photosynthetic Light–Response Curves and Estimating Parameters in Rice Leaves at Various Canopy PositionsYangjie Guo0Yuping Lv1College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaThe photosynthetic light–response (<i>P</i><sub>n</sub>/<i>I</i>) curve is a crucial tool for accurately estimating photosynthetic parameters. However, selecting the most suitable model from numerous available light–response models is still difficult because of the complex canopy structure. This study aimed to evaluate the performance of different models, including the rectangular hyperbolic model (RHM), non-rectangular hyperbolic model (NRHM), exponential model (EM), and modified rectangular hyperbolic model (MRHM), in modeling <i>P</i><sub>n</sub>/<i>I</i> curves and estimating photosynthetic parameters for rice leaves at various canopy positions. The results showed that the NRHM demonstrated the highest accuracy, and the EM was identified as the most ideal in estimating <i>P</i><sub>n</sub>. The RHM consistently overestimated the maximum net photosynthetic rate (<i>P</i><sub>nmax</sub>), apparent quantum efficiency (<i>α</i>), dark respiration rate (<i>R</i><sub>d</sub>), and light compensation point (<i>LCP</i>) while underestimating light saturation point (<i>LSP</i>) for all rice leaves. The NRHM overestimated <i>P</i><sub>nmax</sub>, underestimated <i>LSP,</i> and accurately estimated <i>LCP</i> for all leaves, and overestimated <i>α</i> and <i>R</i><sub>d</sub> for top leaves but performed well for lower leaves. The EM excelled in estimating <i>P</i><sub>nmax</sub> and <i>LSP</i> for all leaves and performed well in estimating <i>α</i> for the top third and fourth leaves, <i>R</i><sub>d</sub> for the top four leaves, and <i>LCP</i> for the top six leaves. The MRHM was effective in estimating <i>P</i><sub>nmax</sub> but consistently overestimated <i>α</i>, <i>R</i><sub>d</sub>, and <i>LSP</i> for all leaves.https://www.mdpi.com/2073-4395/15/1/125model comparisonleaf positionmaximum net photosynthetic rateapparent quantum efficiencydark respiration ratelight compensation point |
| spellingShingle | Yangjie Guo Yuping Lv Evaluation of Models for Describing Photosynthetic Light–Response Curves and Estimating Parameters in Rice Leaves at Various Canopy Positions Agronomy model comparison leaf position maximum net photosynthetic rate apparent quantum efficiency dark respiration rate light compensation point |
| title | Evaluation of Models for Describing Photosynthetic Light–Response Curves and Estimating Parameters in Rice Leaves at Various Canopy Positions |
| title_full | Evaluation of Models for Describing Photosynthetic Light–Response Curves and Estimating Parameters in Rice Leaves at Various Canopy Positions |
| title_fullStr | Evaluation of Models for Describing Photosynthetic Light–Response Curves and Estimating Parameters in Rice Leaves at Various Canopy Positions |
| title_full_unstemmed | Evaluation of Models for Describing Photosynthetic Light–Response Curves and Estimating Parameters in Rice Leaves at Various Canopy Positions |
| title_short | Evaluation of Models for Describing Photosynthetic Light–Response Curves and Estimating Parameters in Rice Leaves at Various Canopy Positions |
| title_sort | evaluation of models for describing photosynthetic light response curves and estimating parameters in rice leaves at various canopy positions |
| topic | model comparison leaf position maximum net photosynthetic rate apparent quantum efficiency dark respiration rate light compensation point |
| url | https://www.mdpi.com/2073-4395/15/1/125 |
| work_keys_str_mv | AT yangjieguo evaluationofmodelsfordescribingphotosyntheticlightresponsecurvesandestimatingparametersinriceleavesatvariouscanopypositions AT yupinglv evaluationofmodelsfordescribingphotosyntheticlightresponsecurvesandestimatingparametersinriceleavesatvariouscanopypositions |