Effects of shading treatment on growth and physiological characteristics of Clematis henryi
[Objective]This study,with an investigation of the physiological response mechanism of Clematis henryi to different light intensity,is aimed to provide scientific basis for its introduction,cultivation,and landscaping applications.[Method]With three-year-old C.henryi cutting seedlings used as experimental materials,five light treatments were set up:full sunlight(ck),80％(T1),60％(T2),50％(T3),and 40％(T4)shading before a study was conducted of the effects of different shading levels on the growth and physiology of C.henryi plants.[Result](1)Shading treatment significantly increased the number of tillers,number of segments and segment spacing of plants(P＜0.05),with the increase in the number of tillers and segment spacing of plants under T1 treatment being the highest(63.0％and 24.3％,respectively),and the segment spacing of plants under T1,T2 and T3 treatments being higher than that of the control(27.5％,8.4％and 32.1％respectively).(2)Shading treatment significantly promoted protein synthesis and decreased MDA production(P＜0.01),with the mass molar concentration of MDA in T1 treatment being the lowest,and the mass fraction of soluble protein(SP)reaching the maximum at 30 d(11.2 mg·g-1).(3)The mass concentration of chlorophyll a and chlorophyll b increased continuously,with each index of the shading group being higher than that of the control at 60 d,and the total mass concentration of chlorophyll reaching the maximum value(2.28 mg·L-1)at 30 d,which was 3.9 times that of the control.(4)The activities of POD and CAT showed the trend of rise-fall-rise with the shading from high to low,while the activities of the two enzymes increased gradually over time,and the opposite was true for SOD.[Conclusion]C.henryi exhibited strong shade tolerance,with shading levels of 50％-60％significantly promoting the growth and dry matter accumulation of branches and leaves,enhancing ornamental value.Therefore,suitable shading environments should be selected for summer cultivation to ensure the healthy growth of plants.[Ch,3 fig.4 tab.30 ref.]
Clematis henryishading treatmentprotect enzyme activitychlorophyllphysiological index
万方数据
维普
