تاثیر سطوح مختلف جیبرلیک اسید، نیترات پتاسیم و سرمادهی مرطوب بر جوانه‌زنی بذر استویا

Seed of many medicinal plants gets to dormancy after maturity. Stevia (stevia rebaudiana), an industrial-medicinal crop plant, is grown for its sweet leaves. Due to low germination of stevia seeds, its seedling are grown through tissue culture and then transplanted in field. In this regard, an experiment was conducted on seed germination of this plant in completely randomized design with three replications at the Seed Technology Laboratory, Khuzestan Ramin Agricultural and Natural Science University. Treatments consisted of application of gibberellic acid (500, 1000 and 2000 mg a.i. L-1), KNO3 solutions (at concentrations of 1 and 3%) and stratification (14 d). Results showed that the application of one percent solution of KNO3 had the greatest effect on stevia seed germination (22.67 %), While, stratified seed showed the lowest germination percentage (4 %).