Effects of He-Ne laser treatment seeds of isatis indigotica on photosynthesis of seedlings

The effects of He-Ne laser pretreatment on the seed of isatis indigotica have been studied in the following aspects,such as content of photoproducts and chlorophyll,biomass,net photosynthetic rate,stomatal conductance and water use efficiency.The results indicated four treatments have improved apparently the content of photoproducts and chlorophyll,stomatal conductance,water use efficiency,level of net photosynthetic rate and so on.Compared with the control,5min treatment is the best among four treatments.Moreover,the influence mechanism of laser irradiation on seedling photosynthesis has been discussed on the basis of the above results.