To clarify the effect of different light quality treatment on the growth of polar,transgenic poplar line Pb29 was taken as experimental material,and full red light,full blue light,red and blue light,full white light four treatments were set by use of light emitting diode( LED) to measure the content of Cry1 Ac toxic protein,morphological index,photosynthetic pigment content and chlorophyll fluorescence parameters of Pb29 under different light qualities. The results showed that the content of Cry1 Ac toxic p...