关键词: 金银花, 新品种, 光合生理特性

Abstract: [Objective] The aim of the study was to study the photosynthetic characteristics of Lonicerae japonicae Flos new variety "Huajin 6" and to provide references for reasonable cultivation measures. [Method] The light response curve, diurnal changes of photosynthetic parameters and chlorophyll fluorescence parameters changes of "Huajin 2" and "Huajin 6" were measured. [Results] Compared with "Huajin 2", "Huajin 6" had lower photosynthetic rate and stronger respiratory rate. Two varieties of Lonicerae japonicae Flos have "two peaks" type curve and two peaks appeared at 9:00 and 15:00, respectively. Typical phenomenon of "photosynthesis midday depression" appeared. P_n and L_s of two varieties exhibited similar dynamic, indicating that photosynthetic rate "photosynthesis midday depression" phenomenon may mainly attribute to the different of mesophyll cells carboxylation ability. Compared to "Huajin 2", the potential photosynthetic activity of "Huajin 6" was lower. It had no ability to resist strong light and high temperature. Under the same light intensity, the degree of photoinhibition was more serious than that of "Huajin 2". [Conclusion] The reasonable cultivation measures should be taken according to the variety of photosynthesis, transpiration, water use efficiency and chlorophyll fluorescence characteristics.

Key words: Lonicerae japonicae Flos, new variety, photosynthetic characteristics