بررسى اثر آللوپاتيك كافئين بر رشد و محتواى رنگيزه هاي فتوسنتزي و اثرمتقابل آن با اسيد ساليسيليك در دانه رست هاى گياه سويا ( Glycine max L. )

Allelopathic effect of caffeine on growth and photosynthetic pigment content, and its interaction with Salicylic acid (SA) in Soybean seedling (Glycine max L.)

Caffeine as an important allelochemical agent has physiological or poisonous effect on plants and microbes, and also participates in metabolic and physicochemical processes. Salysilic acid (SA) as a hormone has important roles in developmental regulation, and strongly participates in several biotic and abiotic defense mechanisms. The aim of this investigation was to study the allelopathic effects of Caffeine on growth and the photosynthetic pigment content in Soybean Seedlings (Glycine max L), and itʹs interaction with Salicylic acid. This experiment was performed using a Two-fac-tor Randomized Complete Block Design. The first factor was 3 levels of Caffeine (0, 100, and 200 mg/L). and the second factor was 4 levels of Salicylic acid (0, 50. 75, and 100 mg/L), each with 4 replicates on Williamsʹ Soybean seed variety in the laboratory. Samples were collected on the 14th day post-pretreatment in order to evaluate growth indices and the pigment content. Our results showed that Caffeine and SA, each had a significant effect on the growth index and the pigment content. Salicylic acid decreased the caffeine intensity stress in all measured characteristics. When used in combination, the intensity of Caffeine-induced stress was lowered by the presence of SA, and the effect on pigment content was significant.