Abstract: In order to improve the efficiency of micropropagation of ginger， the effects of different light quality on the growth and micro\|rhizome induction of in vitro ginger were studied. The results showed that compared with white light， plant height of in vitro ginger increased under green and red lights. The propagation coefficients were significantly reduced under green light， but were just opposite under blue light， and yellow light had a little effect on the growth of in vitro ginger. The net photosynthetic rate of ginger leaves was the lowest under green light， but higher under blue and red light， and stomatal conductance and transpiration rate were higher under blue and yellow light， but lower under red and green light. The time of micro\|rhizome formation of in vitro ginger under green， blue and red lights were earlier than that under white light， but later under yellow light. Moreover， the micro\|rhizome fresh weight of in vitro ginger under green light was higher， which increased by over 60% compared with that under white light. Otherwise the dry mass content， starch and crude cellulose of micro\|rhizome under green light were the lowest， but the highest under blue light. Soluble sugar content was higher under red and yellow light， while lower under green and blue light， but contrary results were observed in soluble protein content. Taken together， green light helps to increase fresh weight of micro ginger， but blue light is more conducive to improve the efficiency of tissue culture and micro ginger in large quantities.

Key words: light quality, in vitro ginger, growth, rhizome induction, micro ginger quality