Investigation of salicylic acid effects on antioxidant enzymes activities of safflower under drought stress

Salicylic acid is one of the growth regulators that plays a protective role against biotic and abiotic stresses. Drought is one of the abiotic stresses that limit plant growth and production. In this study, the effect of salicylic acid on the reduction of drought stress in safflower (Carthamus tinctorius L.) was studied. Plants aged 23-days were sprayed with SA (0, 0.25 mM) and after 2 days irrigated with different field capacity (FC) volumes of water (levels 100%, 75%, 50% and 25% FC). After seven days, plants again were sprayed by SA. After two weeks plants were harvested for experimental analysis. The results showed that drought stress 25%FC increased activities of catalase, peroxidase, superoxide dismutase and contents of H2O2 and malondialdehyde. Interaction of SA and drought increased antioxidant enzymes activities however, H2O2 and malondialdehyde contents reduced. These results suggest that salicylic acid had a significant role in the reduction of free radicals of drought stress in safflower plants.

کلیدواژه ها:

Water stress ، Salicylic acid ، Hydrogen peroxide ، Oxidative stress ، Safflower