inedible biomass and heath index of wheat plants have no significant difference from the CK. Meanwhile, unit yield and unit kilojoule yield of I treatment are better than that of control. More importantly, low intensity at seedling stage induces the highest energy efficiency in BLSS. In our research, we found that there is no substantial gain from low-light treatment at grain filling stage, which might significantly affect the final production. Based on the purpose that not only high efficiency and energy saving, but also maximize the production and control the quality, compared to other light intensity treatments, low-light treatment at seedling stage is fit for the culture of wheat plants in BLSS. The response of physiological and biochemical changes at different growth and development stages to light intensity can provide a theoretical basis for further research to improve energy efficiency and develop high yield cultivation techniques.
Acknowledgement This work was supported by the Ministry of Science and Technology of China (No. 2012DFR30570) and National Natural Science Foundation of China (No. 31301706).