Study on photosynthetic characteristics of Amorphophallus konjac
To enrich the research results on the photosynthetic characteristics of Amorphophallus konjac and provide theoretical basis for the study of the utilization of light energy in growth,the diurnal variation of photosynthesis,light response curve and CO2 response curve of Amorphophallus konjac were measured under clear weather with the Li-6400 portable photosynthesis analyzer by using 2-year-old container seedlings as materials.The results showed as follows:(1)The diurnal variation of photosynthesis of Amorphophallus konjac showed a"bimodal"curve.(2)Light compensation point(PLC),light saturation point(PLS)and apparent quantum efficiency(EAQ)of Amorphophallus konjac were 1.02μmol·m-2·s-1,1 108.3 μmol·m-2·s-1 and 0.023 5,respectively.(3)The carbon dioxide compensation point(PCDC),carbon dioxide saturation point(PCDS)and carboxylation efficiency(EC)of Amorphophallus konjac were 38.15 μmol·mol-1,1 933.3 μmol·mol-1 and 0.014 4.The results indicated that the"photosynthetic siesta"phenomenon of Amorphophallus konjac was non-stomatal limitation,the shade resistance was strong,the light adaptation range was wide,but the ability of weak light utilization was poor,the utilization capacity of CO2 was strong and the demand for CO2was large.
Amorphophallus konjacdiurnal variation of photosynthesislight response curveCO2 response curve