Journal of Hunan Ecological Science

【Objective】It is to study the response of photosynthetic characteristics of Tinospora sagit- tata (Oliv. ) Gagnep. to shading, and to find the suitable light intensity for the growth of Tinospora sagit- tata (Oliv. ) Gagnep. in order to provide a theoretical basis for its efficient cultivation. 【Method】The photosynthetic characteristics of Tinospora sagittata (Oliv. ) Gagnep. were studied and tested under the forest by 4 different light transmission treatments of 70% -90% , 50% -70% , 30% -50% and 10% - 50% . 【Result】The results showed that the growth of Tinospora sagittata (Oliv. ) Gagnep. was the best under 50% -70% light transmittance, and there was no “ photosynthetic lunch break” phenomenon, while it exhibited a relatively high water use efficiency of 9. 69 μmol/ (m2·s), an apparent quantum ef- ficiency of 0. 082, and a low transpiration rate with an average daily value of 0. 71 μmol/ ( m2 ·s). 【Conclusion】Moderate shading could enhance the photosynthesis of Tinospora sagittata (Oliv. ) Gagnep. and its chlorophyll content also increased with the deepening of shading, indicating that it had strong a- daptability to light.

Tinospora sagittata (Oliv. ) Gagnep. ; photosynthetic characteristics; shading; response