Photosynthetic Characteristics of Traditional Chinese Medicine Sambucus chinensis Lind.

Both light and CO2 response curves of wild Sambucus chinensis Lind.were measured with a portable photosynthesis system,and the other parameters of photosynthesis were also measured at the same time.These were designed to deepen the understanding of S.chinensis photosynthetic and physiological characteristics,and to provide the basis for its high-yield cultivation and management.Results showed that the light saturation point(LSP) was 308.97 μmol·m-2·s-1,light compensation point(LCP) was 7.94 μmol·m-2·s-1,maximum net photosynthetic rate(Pmax) was 10.24 μmol·m-2·s-1,dark respiration rate(Rd) was-0.27 μmol CO2·m-2·s-1,apparent quantum efficiency(AQY) was 0.03,which meant that S.chinensis was a shade plant and could use low light for photosynthesis.CO2 compensation point was 55.63 μmol·mol-1,CO2 saturation point was 822.59 μmol·mol-1,and carboxylation efficiency was 0.04,which showed greater photosynthesis potential and survival adaptability.