Preliminary study on the photosynthetic characteristics of some Anemone species

The photosynthesis of several field-grown Anemone species was investigated by using LI-6400 portable photosynthesis system in Kunming,Yunnan Province,China. The diurnal pattern of net photosynthetic rate(Pn)and transpiration rate(Tr)appeared as single peak curves. The peak values appeared at 10∶00～11∶00 and about 13∶00 for Pn and Tr,respectively. The change pattern of Pn looked like an S curve under 0～2 000 μmol·m~-2·s~-1 of photosynthesis active radiation(PAR). The light compensation point and light saturation point of photosynthesis were at PAR 60～80 μmol·m~-2·s~-1 and at about PAR 800 μmol·m~-2·s~-1. But Pn still increased slightly with the increase of PAR from 800 to 1 800 μmol·m~-2·s~-1. Tr only slightly increased as PAR increasing from 0～2 000 μmol·m~-2·s~-1. Under 0～350 μmol·mol~-1 of CO2 concentration,Pn increased linearly,showing a CO2 compensation point at 50 μmol·mol~-1 for A. rivularis,A.hupehensisvar.japonicaand A.vitifolia. Tr change was a horizontal line under 25～350 μmol·mol~-1 of CO2 concentration. The tested Anemonespecies showed difference between their Pn and Tr.