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The present study investigated the effect of sucrose, trehalose and combination of sucrose and trehalose with modified MS medium on in vitro regulation of protocorm-like bodies (PLBs) of Cymbidium devonianum under different quality of lights (white fluorescent tube, green, red and blue LED) . As a result of this study, new PLB and shoots were successfully regenerated on modified MS medium under different quality of lights. The highest PLB formation rate (100%) and the highest shoot formation rate (85%) were observed amongst explants cultured on medium supplemented with 10 g/l sucrose + 10 g/l trehalose under green LED. The maximum fresh weight of PLBs, the highest average number of PLBs and shoots were recorded on medium containing 10 g/l sucrose + 10 g/l trehalose under green LED. For plant tissue culture, sucrose is considered an indisputably important carbon and energy source and biosynthesis of trehalose is similar to that of sucrose. The hereby study concluded that the contribution of LED lights, sucrose and trehalose (combined) can induce PLB and shoot formation of Cymbidium devonianum tissue culture without the use of any other plant growth regulator, whereas the green light showed the best formation rate compare with the other studied qualities of lights.

Effect of Light Quality, Sucrose and Trehalose on In Vitro Organogenesis of Cymbidium devonianum (Lindl.)