Effects of light quality on the organs structure and photosynthesis characteristics of the hybrid rice'Kangyou 63'seedlings

By using light emitting diode(LED)to accurately modulate light spectral energy distribution,and with fluorescent light as the control,the effects of light quality on the organs structure and photosynthesis characteristics of the hybrid rice'Kangyou 63'seedlings were studied in this paper.The results showed that,blue light significantly increased the stomatal density and the diameter of roots and epigenetic catheter,and promoted the sclerenchyma differentiation of roots.Moreover,the flag-leaf sheath developed well,vascular bundle and ground tissue showed obvious differentiation,and cells arranged densely under blue light.Under red+blue light,stomatal length and width had a significant negative correlation.The photosynthetic rate was obviously increased under different light treatment,where it reached the maximum under blue light treatment and the next were red+blue,red and yellow light.Under blue,red+blue and yellow light,the Fv/Fm and Fv/Fo were significantly improved.And,qP,ΦPSⅡ and ETR were significantly increased under blue and yellow light.On the whole,blue light was more beneficial for the growth and development of hybrid rice seedling,and could significantly increase the photosynthetic capacity,followed by red+blue light.