Fig. 4From: Influence of light-emitting diodes on phenylpropanoid biosynthetic gene expression and phenylpropanoid accumulation in Agastache rugosaTilianin content in A. rugosa after expose to various LED lights at different time intervals (1, 2, and 3 weeks). Each of the three individual experimental groups was analyzed using HPLC. Error bars show standard deviation values. Significant difference are highlighted with *P < 0.05 and **P < 0.01. DW, dry weightBack to article page