Relationship among growth, quality, and anti-oxidant activities of Sedum sarmentosum under different soil moisture / 中草药

ABSTRACT

Objective: To explore the effect of soil moisture on growth, bioactivity compounds accumulation, and anti-oxidative activity of Sedum sarmentosum. Methods: The changes of growth, yield, contents of total flavonoids, total phenolic, quercetin, kaempferol and isorhamnetin, and anti-oxidant activities were assessed in S. sarmentosum under five water gradient, namely 15% - 20% FC (field capacity, S1), 35%-40% FC (S2), 55%-60% FC (S3), 75%-80% FC (S4), and 95%-100% FC (S5). Results: S4 treatment greatly promoted the growth and yield while severe drought suppressed growth. The highest total flavonoids content was obtained in S4 treatment, while the lowest was found in S5 treatment. The total phenolic content in S3 treatment was the largest, but there was no significant difference comparing with S4 treatment. Meanwhile, the highest quercetin, kaempferol, and isorhamnetin content were obtained from S1, while S5 treatment showed the lowest values. Besides, the yield of three flavone ingredients per plant peaked in S4 treatment, followed by S5 treatment, and the S1 treatment resulted in the smallest yields. In addition, S4 treatment resulted in the highest anti-oxidant activities of the aqueous extracts based on DPPH, TBARS, and FRAP methods. There was a significantly positive relationship among the antioxidant activities of the aqueous extracts based on TBARS, contents of quercetin, isorhamnetin. Conclusion: In summary, the Results: indicated that 75%-80% FC was the optimum soil moisture condition to achieve high yield and quality of S. sarmentosum.