Abstract
Centella asiatica—a medicinal plant that produces high-value active triterpenoids—is in increasing demand by the pharmaceutical and cosmetic industries. The aim of this study was to field-test one induced tetraploid and three diploid C. asiatica lines for the selection of high-quality plants with high phytomass and triterpenoid content and to determine their optimal harvesting time. All tested C. asiatica were micropropagated using an established protocol. One-month-old plantlets were acclimatized for the field experiment. The plants were grown in a randomized complete block design (RCBD) with three replications, ten plantlets per replication, and the experimental bed site was 0.6 × 1.0 m. Growth parameters, phytomass and the amounts of four active triterpenoids were evaluated. All lines exhibited the highest growth, yields and triterpenoids at 4 months after cultivation. The tetraploid line showed significantly better characteristics, i.e., larger leaf area, leaf width, petiole length, and greater yields, than diploid lines. Dry weight per cultivated area (77.53 ± 3.07 g/m2) and total triterpenoids (15.38 ± 0.76 % dry weight) were increased significantly in tetraploid plants of C. asiatica. Furthermore, the harvesting time had an effect on the yield and triterpenoid content (P < 0.001). In all tetraploid and diploid lines, the yields and triterpenoid content per cultivated area reached their maximum at 4 months after planting. Our results demonstrated that polyploidy induction is a beneficial tool that can be used to improve the medicinal value of C. asiatica.
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This research was supported by the Institutional Strengthening Program, Mahidol University, and the Chao Phya Abhaibhubejhr Hospital Foundation.
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Thong-on, W., Arimatsu, P., Pitiporn, S. et al. Field evaluation of in vitro-induced tetraploid and diploid Centella asiatica (L.) Urban. J Nat Med 68, 267–273 (2014). https://doi.org/10.1007/s11418-013-0761-4
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DOI: https://doi.org/10.1007/s11418-013-0761-4