Modulation of morphological and biochemical attributes in Stevia rebaudiana via foliar application of salicylic acid

This research aimed to assess how the foliar application of salicylic acid influences the physiological and biochemical traits of Stevia rebaudiana. The investigation encompassed various parameters including plant height, branch and leaf counts, fresh and dry leaf biomass, chlorophyll and carotenoid levels, along carbohydrate and protein contents. Multiple concentrations of salicylic acid – 50, 100, and 150 mg/l – were applied through foliar spraying, while a control group received no salicylic acid treatment. Results derived from the experiment highlighted that Stevia plants treated with 100 and 150 mg/l levels of salicylic acid exhibited increased plant height, branch and leaf numbers, and higher yields of fresh and dry leaves compared to the non-treated control group. Furthermore, the application of salicylic acid positively impacted chlorophyll, carotenoid, protein, and carbohydrate contents in Stevia leaves. The application of salicylic acid not only enhanced both the quantitative and qualitative attributes of the plant but also led to improved performance during its growth cycle. These findings hold substantial significance across various agricultural contexts.