عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In order to evaluate the effect of priming by salicylic acid on seed germination and vegetative and physiological characteristics of zinnia (Zinnia elegans) under drought stress condition, two laboratory and pot factorial experiments were conducted based on completely randomized design with four replications in the laboratory and greenhouse of the Department of Horticulture, Faculty of Agriculture and Natural Resources, Hormozgan University at 2014. Experimental factors included priming with salicylic acid in concentrations of 0, 0.5, 1 and 1.5 mM and four drought levels (simulated by PEG 6000) ; 0, -0.5, -1 and -1.5 MPa. The results showed that in both laboratory and pot experiments drought stress reduced seed germination and early seedling growth of zinnia, significantly. While, seed priming with salicylic acid increased these traits when compared to control. In the pot experiment and -1 and -1.5 MPa drought conditions, the seed treatment with 1 mM concentration of salicylic acid improved zinnia vegetative characteristics. At the highest level of drought (-1.5 MPa) level application of 1.5 mM salicylic acid led to dampen the negative effects of the drought. Seed priming with salicylic acid increases the relative water content of the leaves under drought stress conditions. Generally seed priming with salicylic acid can be used for improving zinnia seed germination under drought conditions.