Introduction: Currently, there is great interest in phytochemicals as bioactive components. The roles of fruits, vegetables, and red pigments in preventing diseases have been partially attributed to the antioxidant features of their constituent polyphenols, flavonoids, anthocyanins, and so on. Methods: Biochemistry parameters including the relative levels of antioxidant activity, total phenolic content, total flavonoid, total anthocyanin, and soluble and insoluble sugar contents of Ribes khorasanicum were measured. Results: The total phenolic and flavonoid content of the fruits were calculated as 33. 6 mg/g dry weight and 23. 36 mg/g dry weight, respectively. Anthocyanin was measured as 62. 9 mg/g dry weight, indicting anthocyanin as the predominant antioxidant component in this plant. The content of soluble sugar was 5. 65 mg/g dry weight, while the amount of insoluble sugar was 4. 60 mg/g dry weight. The 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity was observed to be 6. 42 mg/g dry weight. Conclusion: Anthocyanin was the predominant antioxidant component in the investigated plant. This particular plant has the potential to serve as an important source of anthocyanin which is useful in medicinal and food industries.

Freshly harvested seeds of Rhubarb exhibited a high degree of dormancy when germination has been studied in different temperatures in distilled water. In the present paper, different treatments including moist - chilling, immersing in NaOCl, acid scarification, surgical procedure, and treatment by CaCl2 and KNO3 were performed to determine the most effective method for removing dormancy in Rhubarb (Rheum Ribes L.). When seed coats (pericarp + testa) were completely removed, the root and hypocotyls of excised embryo from dormant seeds did not elongate. This indicates that dormancy is imposed by the embryo and those inhibitors in seed embryo may be responsible for the dormancy. Germination was observed only in CaCl2 and KNO3 treatments. Optimum temperature for germination was 10oC and dormancy was partially removed when seeds were germinated in different concentrations of CaCl2. Moreover, CaCl2 solutions promoted germination more than KNO3.