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- W2379526456 abstract "In the relationship between photosynthesis and environmental factors or biochemical factors or between stomatal limitation and non-stomatal limitation in depression of photosynthesis at noon, photosynthetic simulations by a mathematical model (a regression equation between net photosynthetic rate (Pn) and intercellular CO2 concentration (Ci) or other environmental factors including photosynthetic available radiation (PAR), air temperature (Ta), ambient CO2 concentration (Ca) and relative humidity (Hr)) or FvCB model (Farquhar-von Caemmerer-Berry biochemical model of leaf photosynthesis) were analysed. The model examined the response curve of net photosynthesis (Pn) and intercellular CO2 concentration (Ci) measured under treatments of combined photosynthetic available radiation (PAR) and leaf temperature (Tl), over a photosynthetic diurnal course measured under 1100±100 μl/L CO2 enrichment in greenhouse microclimates on eggplant (Solanum melongena L.) F1 hybrid ‘QIEZA-1’. The parameters of Pn, PAR, Ta, Tl (leaf temperature), Ca, Ci and Hr were measured with a CI-301PS photosynthesis analyzer. In terms of either response of Pn on Ci or photosynthetic diurnal course, the mathematical model imitated measured Pn much better than the FvCB model. The simulation by the mathematical model indicated that photosynthetic diurnal course could be influenced by both a single environment factor and complex ones. The simulation of the FvCB model showed that a dominant role of the rate of carboxylations changed from one to another among Ac, Aj, and Ap as Ci increased combined with increase of PAR and Tl. Ac was limited by the amount, activation state and kinetic properties of ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco). Aj was limited solely by the rate of ribulose-1,5-bisphosphate (RuBP). Ap was limited by the rate of triose-phosphate utilisation (TPU). Ci cj, intercellular CO2 concentration of the change point of dominance from Ac to Aj, was a higher under high PAR and Tl than low PAR and Tl. Ci cj and Ci jp, intercellular CO2 concentration of the change point of dominace from Aj to Ap, was influenced more strongly by Tl than PAR. The FvCB model also indicated that the limiting carboxylation rate was Aj in the early morning and toward evening, and it was Ac in the late morning and at noon. Period of Aj limitation might be extended by cloudy weather and CO2 injection once per day. Ap limitation occurred with application of CO2 injection twice a day." @default.
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- W2379526456 date "2007-01-01" @default.
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- W2379526456 title "Analysis of photosynthetic simulation by a biochemical model or mathematical model in greenhouse eggplant" @default.
- W2379526456 hasPublicationYear "2007" @default.
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