For investigation of the effect of seed priming with pyridoxine on Echinacea purpurea (L.) Miench germination under drought stress, factorial experiment based on completely randomized design with two factors including different concentrations of pyridoxine (0, 0.02%, 0.04%) and different levels of drought stress (0, -6 and -12 bar) was carried out in three replicates. The results showed that, drought stress and pyridoxine concentrations have significant (P<0.01) effect on germination Percentage, germination rate, seed vigor, mean time germination, seedling length and seedling dry weight. According to the results, the -12 bar drought stress gave the minimum germination indices and the maximum germination indices were obtained in pyridoxine at 0.04%. Therefore, seed priming is important strategies for drought stress tolerance.
