Effects of Soil Drought Stress on Photosynthetic Physiological Characteristics of Berberis thunbergii cv. atropurpurea and Buxus sinica
[ Objective ] The propose was to study the photosynthetic physiological characteristics in Berberis thunbergii cv. atropurpurea and Buxus sinica under different soil water stress. [ Method ] In the pot test, the relative water contents in the soil were set up as 4 grades of 90% -95% , 60% -65% , 40% -45% and 20% -25% , which were the CK and light, middle and heavy drought stress treatment. The chlorophyll fluorescence and photosynthetic parameter of 2 plants were determined on 10th after drought stress treatment. [ Result] With the increase of water stress degree, the main photosynthetic parameter such as Pn, Tr and Gs of the 2 plants were gradually decreased; WUE of the 2 plants were increased first and then reduced, in which, WUE of B. thunbergii cv. atropurpurea was the highest in light water stress, but that of B. sinica was the highest in middle water stress; as for the chlorophyll fluorescence parameter of the 2 plants, Fo was increased, while Fm , Fv, Fv/Fm and Fv/Fo were decreased,in which,B. thunbergii cv. atropurpurea had higher change than B. sinica. [Conclusion] The water stress had greater effects on the photosynthetic physiological characteristics of B. thunbergii cv. atropurpurea and B. sinica, but their change extent differed. B. thunbergii cv. atropurpurea was more sensitive to soil water stress and B. sinica had greater drought resistance than B. thunbergii cv. atropurpurea.
Water stressBerberis thunbergii cv. atropurpureaBuxus sinicaPhotosynthesisChlorophyll fluorescence
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