Effect of seed priming by pyridoxine on germination and biochemical indices in Silybum marianum L. under drought stress

In order to investigation of the effect of seed priming by pyridoxine on germination and biochemical indices of Silybum marianum L. under drought stress, factorial experiment based on completely randomized design with two factor includingdifferent concentrations of pyridoxine including 0, 0.02% and 0.04% and different levels of drought stress including 0, -6 and -12 bar at three replicates was performed. The results indicated that drought stress affected measured indices at P<0.01 and pyridoxine significantly affected germination percentage and rate, seed vigor, mean time germination, seedling length and dry weight at P<0.01 and peroxidase activity at P<0.05. Interaction between the drought stress and pyridoxine was significantly (P<0.05) affected of germination rate and seed vigor. The results showed that with increasing drought stress, germination indices were decreased and biochemical indices were increased. Seed priming with pyridoxine cause to improvement of germination indices and decreases biochemical indices. According to the results, seed priming with 0.04% pyridoxine cause to improvement of germination indices at drought stress conditions.

Priming; Proline; Pyridoxine; Germination; Catalase; Silybum marianum L