Photosynthetic Characteristics of Ligulariajaluensis and Its Influencing Factors
Diurnal variation of photosynthesis and light response curve for 1-year-old Ligularia jaluensis were determined by CIRAS-2 Portable Photosynthesis System. Light response curve was simulated with an improved model of light-response curve of photosynthesis. The correlations between physiological and environmental factors influencing the photosynthesis significantly were analyzed. Results showed that the diurnal change of net photosynthetic rate of L. jaluensis in summer could be expressed with a bimodal curve, and a midday depression of photosynthesis restricted by nonstomatal factors was observed.The net photosynthetic rate of L. jaluensis exhibited an extremely significant positive correlation with leaf surface temperature ( P＜0.01 ), an markedly significant negative correlation with carbon dioxide concentration ( P＜0.01 ) and an significant negative correlation with intercellular carbon dioxide concentration ( P＜0.05 ). The light saturation point, light compensation point, the maximum net photosynthetic rate and apparent quantum yield of L. jaluensis were 747.49μmol · m-2 ·s-1, 19.06μmol · m-2 · s-1, 4.95 μmol · m-2 · s-1 and 0.067 mol/mol, respectively.
Ligularia jaluensisPhotosynthetic characteristicsInfluencing factorshnproved model of light-response curve of photosynthesis
NETL
NSTL
万方数据
维普
