Tissue culture seedlings of Eustoma grandiflorum were used as test material,using different combination of LED red,blue,green and colorless of light quality.The effects of different light qualities on growth of Eustoma grandiforum in vitro under light-emitting diodes(LEDs) were investigated.By arraying the different wave length and ratio of LEDs,the 7 kinds of light quality were built.The morphological and physiological characteristic,such as proliferation rate,rooting,chlorophyll content,carbon-nitrogen an...