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Study on Chemotypic Variability of Coleus forskohlii Briq., Samples Collected from Different Phytogeographical Locations of India and Evaluation of Its Inhibitory Potential.

Coleus forskohlii Briq. is an important medicinal herb, endowed with a wide range of medicinal properties against the variety of ailments. Seven germplasm of C. forskohlii collected from different phyto-geographical locations and identification of elite chemotype was performed with the help of high performance thin layer chromatography. Data of soil analysis correlated with the bioactive compounds and inhibitory potential of the species. Quantification of forskolin and its isomer (iso-forskolin) content were done in all the collected samples of C. forskohlii, which revealed a wide range of variations, varying from 1.15-0.004% and 0.0091 to 0.1077% per dry weights basic, respectively. Variation in the bioactive content may be due to the soil nature and environmental factors. Soil analysis of collected samples demonstrated that there is significant variation in available NPK and micronutrient content and may be reasoned for existing chemotypic variability. In vitro biological activity (antioxidant and antidiabetic) analyses were performed, which reveals that germplasms have a high amount of forskolin and iso-forskolin, both show more activity. The aim of this study was to elucidate the effect of elicitors and precursors on the production of bioactive compounds and identification of best elite germplasm among the populations, to provide basic lead to the industry for commercial exploitability including its location-specific commercial cultivation.