استجابة نبات استيفيا ( Stevia rebaudiana bertoni ) مورفولوجيا و فيزيولوجيا للمعاملة بخليط من الأحماض الأمينية

Abstract

The research was carried out at the Lattakia University Nursery during the agricultural season 2022/2023 to study the effect of treatment with amino acids at concentrations of (2-1-0 g/L) on the morphological and physiological characteristics of Stevia rebaudiana bertoni. Two-month-old Stevia plants were obtained from a private nursery and distributed in pots according to a complete randomized block design at a rate of five replicates for each treatment.  Some morphological characteristics were measured (plant height (cm), total number of leaves (leaf/plant), number of main branches (main branch/plant), dry weight (g), fresh weight (g) and some physiological characteristics (chlorophyll a and b, total %, carotenoids %, and total soluble sugars%). The results showed the positive effect of treatment with amino acids at a concentration of (2g/L), as it outperformed the control treatment and the treatment (1g/L) in all studied characteristics, as the values ​​of the morphological characteristics reached, respectively, (99.5cm, 287 leaves/plant, 7.5 main branches/plant, 20.09g, 35.16g). The values ​​of the studied physiological characteristics reached, respectively, (1178.04%, 2989.7%, 70.44%, 35.45%). Therefore, we recommend using amino acids at a concentration of (2g/L) as a spray.  On the plant because it enhanced the production of Stevia in terms of quantity and quality and had a noticeable positive effect on various growth characteristics.