Photosynthesis of Young Shoots on Greenhouse 'Jinmudan' Tea Plant
[Objective]Photosynthetic characteristics of young shoots at developmental stages on'Jinmudan'Tea plant in a greenhouse were analyzed for improved cultivation.[Method]A portable GFS-3000 photosynthesis measurement device was used to determine the net photosynthetic rate(Pn),transpiration rate(Tr),maximum net photosynthetic rate(Pnmax),saturated light intensity(LSP),and light compensation point(LCP)of"small unfurled"shoots(SUFS)and"medium unfurled"shoots(MUFS)located on top of branches of Jinmudan Tea plant.The collected data were fitted with light exposure to formulate a response function using the modified rectangular hyperbolic model.[Result]The measurements on Pn of the shoots ranged 2.63-4.74 μmol·m-2·s-1 with the 1st MUFS on a plant being the lowest and the 3rd MUFS the highest,while Tr ranged 2.31-5.97 mmol·m-2·s-1 with the 1st MUFS being the lowest and the 2nd MUFS the highest.Among the young shoots on a plant,the greatest Pnmax of 7.40 μmol·m-2·s-1 and LSP of 1208.10 μmol·m-2·s-1 were found on the 3rd MUFS and the lowest of 3.20 μmol·m-2·s-1 and that of LSP of 867.03 μmol·m-2·s-1,on the 1st MUFS.The LCP ranked as 1st MUFS at 32.95 μmol·m-2·s-1>2nd MUFS at 25.93 μmol·m-2·s-1>3rd MUFS at 20.53 μmol·m-2·s-1.[Conclusion]In general,Pn of MUFS was greater than that of SUFS.The 3rd MUFS could more efficiently utilize strong or weak light as well as have a greater overall photosynthesis potential.
GreenhouseCamellia sinensislight responseshoot at various location on a plantphotosynthetic parameters
万方数据
