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Planta Med 2004; 70(2): 147-151
DOI: 10.1055/s-2004-815492
Original Paper
Physiology
© Georg Thieme Verlag Stuttgart · New York

Enhancement of Tanshinone Production in Salvia miltiorrhiza Hairy Root Culture by Ag+ Elicitation and Nutrient Feeding

Changhe Zhang1 , 2 , Qiong Yan1 , Wai-keung Cheuk1 , Jianyong Wu1
  • 1Department of Applied Biology & Chemical Technology, the Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
  • 2Current address: Institute of Plant Genetics, School of Life Sciences, Huazhong University of Science and Technology, Wuhan, P.R. China
This work was supported financially by the Hong Kong Polytechnic University (G-T431) and the Areas of Excellence Scheme established under the University Grants Committee of the Hong Kong SAR, China (AoE/B-10/2001 and AoE/P-10/2001)
Further Information

Publication History

Received: August 26, 2003

Accepted: November 9, 2003

Publication Date:
02 March 2004 (online)

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Abstract

Ag+ was employed as an abiotic elicitor to stimulate the secondary metabolite production in hairy root culture of Salvia miltiorrhiza, a valuable herbal plant. The addition of Ag2S2O3 at 15 - 40 μM to the culture between 12 and 22 days post inoculation resulted in more than 2-fold increase in the yields of the three diterpenoid tanshinones, tanshinone I, tanshinone IIA and cryptotanshinone. This stimulating effect was dependent on the Ag+ dose, the day of Ag+ addition to the culture and the tanshinone species, while the total yield of the three tanshinones (TT) was mainly dependent on the Ag+ dose, with the highest being attained at 30 μM. The Ag+ treatment also caused a dose-dependent inhibition of hairy root growth. Sucrose feeding or medium renewal before the addition of Ag+ to the culture effectively prevented the growth inhibition, and significantly increased the biomass concentration and volumetric tanshinone yield. With combined medium renewal and Ag+ treatment, in particular, the TT yield was increased 6.6-fold relative to that of the control (55.7 mg/L versus 7.3 mg/L). The elicitor function of Ag+ in the hairy root culture was validated by its ability to induce the characteristic elicitor responses of plants, the increase in cross-cell membrane ion fluxes and the production of reactive oxygen species.

Key words

Hairy root culture - Salvia miltiorrhiza - Lamiaceae - tanshinones - Ag+ elicitation - nutrient feeding

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Jianyong Wu

Department of Applied Biology & Chemical Technology

The Hong Kong Polytechnic University

Hung Hom

Kowloon

Hong Kong

Phone: +852-2766-6687

Fax: +852-2364-9932

Email: bcjywu@polyu.edu.hk