Abstract:

The effects of severing stolon on chlorophyll fluorescence characteristics of Sabina vulgaris were measured with portable fluorometer (MINI-PAM). The results were shown as following: The differences of ΔF/F′_m (effective quantum yield), ETR(electron transfer rate) and NPQ(non-photochemical quenching) between the control and the severed samples were not significant during the daily course except at 15:00 before severing stolon(August 15) (P>0.05).In first day of severing treatment(August 16), the differences of ΔF/F′_m between the control and the severed samples were significant at 9:00 and 18:00,and the value of ΔF/F′_m of treated samples was 25% lower than that of control at 9:00;the differences of ETR between them were not significant (P>0.05)and the value of ETR of treated samples decreased by 13%; the differences of NPQ between them were significant at 9:00 and 12:00, and the value of NPQ of treated samples increased to 47% in morning and decreased to 15% in afternoon(P<0.05). On August 24, the difference rate of ΔF/F′_m, ETR and NPQ between the control and the treated samples were 33%, 43% and 58% respectively; the stomatal conductance of treated samples was about 30% of control at 8:30 and 36% of control at 12:00, and was about 39% lower than of control in afternoon(P<0.05). On August 19, the differences of F_v/F_mof different parts of shoots between the control and the treated samples were not significant(P>0.05), which indicated that the adventitious roots played an important role in resisting influence of severing stolon.

Key words: Sabina vulgaris, Chlorophyll fluorescence, Stolon