Parsley (Petroselinum crispum L.) as one of medicinal plants, is rich in poly-phenolic flavonoid antioxidants, including apiin, apigenin, crisoeriol, and luteolin; and has been rated as one of the plant sources with quality antioxidant activities. The purpose of this research was to study the effect of salicylic acid (SA) priming on growth and some morphophysiological parameters in arial parts of parsley in molybdenum (Mo) stress condition. Sterilized seeds soaked for 6 hours in SA solution (0, 0.5, 1, 2, 5 Mm), then transferred to pots contain perlit and irrigated with Hoagland nutrient solution in different Mo concentration (control, 0.5, 2.5, 5 and 10 Mm) in duration of 30 days. After harvesting the plantlets, the growth parameters (dry weight and length of roots and shoots), photosynthetic pigment characters (Chl.a , Chl.b, Chl a/b, total Chl. and carotenoid) and relative water content (RWC) of leaves was analyzed. The results showed that Mo had toxic effects as it linearly decreased organ dry weight and length, relative water content and reduced the contents of leaf photosynthetic pigments, significantly. However, treatment with various concentrations of SA confirmed that this priming could decrease Mo stress and it was so concluded to improve Mo-related stress symptoms of Parsley.

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