الفهرس 
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Abstract
Stevia plant produces a low-calorie sweetener in the leaves of the plant and is being a calorie free sweetener, therefore, it is considered as a helpful food additive for people with hypertension, diabetes and obesity. Leaves of stevia produce diterpene glycosides (stevioside and rebaudioside A), which are high-potency sweeteners (300 times sweeter than sucrose).
The aim of the present study is to investigate the effect of micronutrients applications on stevia growth, the concentrations steviol glycoside in plant leaves, the relative expression of UGT76G1 gene, and comparing UGT76G1 gene sequences amplified from different varieties of Stevia rebaudiana Bertoni.
The obtained results could be summarized as follows:
• Morphological characterization of stevia:
- Plant heights were varied among treatments when the results were analyzed 45 days post treatment. The highest plant height average value was found in Egy1 variety treated with B and Mo (T7 treatment) after 45 days post foliar treatment (PFT). Meanwhile, in variety China1 the effect of foliar treatments on plant height gave the highest mean value when the plants were treated with B (T3 treatment). Furthermore, Sponti variety showed the highest value when plants were treated with B (T3 treatment).
- The total number of branches per plant was increased in variety Sponti when plants were treated with micronutrients. However, no significant changes were detected in Egy1 and China1 varieties.