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ISSN : 1225-5009(Print)
ISSN : 2287-772X(Online)
Flower Research Journal Vol.32 No.S pp.31-31

Photosynthetic Parameter Estimation of FvCB Model in Lily (Lilium Oriental Hybrid) with Different Leaf Positions

Hoon Choi1, Won Jun Jo1, Hyo Beom Lee1,2*
1Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul, 08826, Korea
2Research Institute of Agriculture and Life Science, Seoul National University, Seoul, 08826, Korea


Mathematically modeling photosynthesis helps to interpret gas exchange in plants and estimate the photosynthetic rate as affected by environmental factors. Notably, the photosynthetic rate varies among leaf positions within a single plant individual. The objective of this study was to measure the distinct photosynthetic rate of lily (Lilium Oriental Hybrid ‘Casa Blanca’) at the upper, medium, and basal leaf positions. Subsequently, the FvCB (Farquhar-von Caemmerer-Berry) photosynthesis model was employed to determine the parameters of the model and compared with a rectangular hyperbola photosynthesis model. After three months of cultivation period, the photosynthetic rates were measured at different intracellular CO2 concentrations (Ci ) and photosynthetic photon flux density (PPFD) levels. SPAD values significantly decreased with lowered leaf position. The photosynthetic rates at the medium and basal leaves were lower compared with the upper leaves. FvCB model parameters, Vcmax and Jmax, showed no significant difference between the medium and basal leaves. Estimated photosynthetic rates from derived parameters by the FvCB model demonstrated over 0.86 of R2 compared with measured data. The rectangular hyperbola model tended to overestimate or underestimate photosynthetic rates at high Ci with high PPFD levels or low Ci with high PPFD levels, respectively, at each leaf position. These results indicated that the parameters of the FvCB model with different leaf positions can be used to estimate the photosynthetic rate of lily.




  2. Journal Abbreviation : 'Flower Res. J.'
    Frequency : Quarterly
    Doi Prefix : 10.11623/frj.
    ISSN : 1225-5009 (Print) / 2287-772X (Online)
    Year of Launching : 1991
    Publisher : The Korean Society for Floricultural Science
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