Abstract: Photosynthetic characteristics of four rejuvenation}rown tree peony were studied comparatived with the LI-6400 portable photosynthetic analysis system before flower blossom. The result were as follows:Diurnal variation of net photosynthetic rate (Pn) in leaves of the four cultivars appeared a single-peak curve which occurring at about 11:00,and Paeonia suffruticosa Zierqiao has a lower Pn than Paeonia suffrutacosa Yinhongqiaodui,which Pn was 10. 52 umol/( m².s ).There were different reasons for the decrease of four cultivars ,Pn:the main reason for Paeonia suffrutacosa Wulongpengsheng and Paeonia suffrutacosa Baiyuanhongxia was stomatal factor while a combination of stomatal and non-tomatal factors caused the decrease of Pn in Paeonia suffrutacosa Zierqiao and tree peony Paeonia suffrutacosa Yinhongqiaodui. There was a significant difference in light saturation point(LSP),light compensation point (LCP) and appaent quantum yield (AQY) of the four cultivars. With the highest LSP and LCP tree peony Zierqiao was 0. 020 3 mol/mol in AQY which was significantly lower than others showing a better adaptation to the weak light.

Key words: Paeouia suffruticosa Andr., Rejuvenation growth, Photosynthetic characteristics

CLC Number: 

• S685.01