Fig. (3) Effect of dihydrodiconiferyl alcohol (1) dissolved in DMSO on Yield and NPQ in leaves of lettuce after 14 days of MS medium culture, supplemented with (▧) or without sucrose (▇). Lignans were added from the day 4 of MS culture. Controls, with and without sucrose, were treated only with DMSO. The values are mean ± SD (n=6).