Medicinal & Aromatic Plants

Medicinal & Aromatic Plants
Open Access

ISSN: 2167-0412

+44 1300 500008

Research Article - (2016) Volume 5, Issue 4

Effect of Different Carbon Sources and Elicitors on Shoot Multiplication in Accessions of Centella asiatica

Koyel Kundu, Arpita Roy, Gaurav Saxena, Lakhan Kumar and Navneeta Bharadvaja*
Department of Biotechnology, Plant Biotechnology Laboratory, Delhi Technological University, New Delhi, India
*Corresponding Author: Navneeta Bharadvaja, Department of Biotechnology, Plant Biotechnology Laboratory, Delhi Technological University, New Delhi-110 042, India, Tel: 9198684466137 Email:

Abstract

Centella asiatica is a medicinal herb which has been extensively used in the treatment of nervous disorders and skin diseases. It is distributed throughout the tropical and sub-tropical region of the world. This plant contains various bioactive constituents such as asiaticoside, madecassic acid, flavonoids etc. Centella is in huge demand in International market for the preparation of pharmaceuticals and cosmetics which has resulted in its overexploitation. This situation demands the use of biotechnological methods to conserve as well as increase the production of biomass and bioactive compounds. The present study focused the use of different carbon sources (sucrose and fructose) and elicitors (Malt extract, Salicylic acid and Jasmonic acid) for the enhancement of biomass in five accessions of Centella asiatica. It was concluded that Murashige and Skoog (MS) medium supplemented with 1 mg/L concentration of Malt extract and 1.5 mg/L concentration of 6-Benzyl amino purine (BAP) showed highest biomass production among all elicitors. Among two carbon sources, MS media supplemented with Sucrose (3 mg/L) along with BAP (1.5 mg/L) showed better result than fructose.

Keywords: Centella asiatica; Carbon sources; Elicitors; Sucrose; Fructose; Malt extract; Salicylic acid; Jasmonic acid

Introduction

Centella asiatica is a perennial herb belonging to the family Apiaceae and found throughout tropical and sub-tropical regions of India. This plant is known by different names in different regions of India, Manimunni in Assam, Thankuni in Bengali, Vallari in Decan, Mandookaparni in Hindi and Gotukola in Sinhali [1]. It is a softly perfumed, creeping plant that attains height up to 15 cm. Stem is smooth and rooting occurs at the nodes. It grows extensively in marshy, damp and wet places and flowering occurs during April to June with white to purple or pink flowers. Fruits are approximately 2 inches long, globular in shape and strongly thickened pericarp [2]. This plant has been used since ancient days in Ayurvedic medicines. Use of this plant has been described in the ancient literature Charaka Chikitsa [3]. Whole plant is used for the preparation of drug and these drugs can be used internally or externally. Paste from fresh herbs can be used externally for the treatment of rheumatism and elephantitis. Leaf juice can be applied on forehead in case of headache. An ointment prepared from this plant can be used for the treatment of leprosy or any skin disorder [3]. One of the bioactive compound i.e., asiaticoside helps in collagen I synthesis in human [4]. Asiaticoside shows antitumor activity by apoptosis of cancer cells. This plant can also be used for the treatment of eczema. Internally, it can also be used for the treatment of various diseases such as bronchitis, asthma, gastric, leucorrhea, kidney disease, urethritis and dropsy [5]. Centella asiatica contain various types of bioactive compounds like Asiaticoside, Medacassoside, Brahmoside, Alkaloids (Hydrocotylin), triterpene glycoside, Triterpene acid, Anthrone of Asiaticoside, Asiatic acid, Madegascaric or madecassic acid Isothankuniside, Brahmic acid, Centelloside, Centic acid, Indocentoic acid, Indocentelloside, Oligosaccharide, etc. [6,7]. The plant also contains volatile and fatty oils. Glycosides of palmitic, stearic, oleic and linolenic acids are present in fatty oils.

Due to great medicinal importance of Centella asiatica in the preparation of different pharmaceutical compounds, this plant has been overexploited and marked as threatened plant species by the International Union for Conservation of Nature and Natural Resources (IUCN), and also as an endangered plant species [8,9]. Thus conservation of this plant is need of the hour. Biotechnological methods not only help in the conservation of endangered plants but also help in the enhancement of biomass and commercially important plant products.

Mass propagation of plants through in vitro micro propagation is the most successful commercial application of plant tissue culture technique. In vitro propagation may provide a potential solution for cloning of plant and secondary metabolite production. Application of elicitors is one of the most important method to increase the production of secondary metabolites in plants. Elicitors are the molecule that enhances the secondary metabolite production under stress [10]. In plant tissue culture, plants are grown under stress condition but the plant genome has the defense mechanism to protect the plant via some secondary metabolite production. Elicitors are the signal compound of plant defense mechanism [11]. It was reported that elicitors enhance bioaccumulation of asiaticoside in C. asiatica [12]. Sugars also have important role in metabolic activity [13] as they enhance the formation of auxiliary buds and branching of adventitious roots [14]. But the above mentioned effects are not universal and depend on the geographical conditions of plant to a great extent. Plant of same species is collected from different locations and is assigned an accession number. Accessions differ in their growth pattern and secondary metabolite content. Therefore the present study was undertaken to determine the effect of different carbon sources like sucrose and fructose and different elicitors, like Malt extract (ME), Salicylic acid (SA), Jasmonic acid (JA) on growth of five different accession of Centella asiatica and to assess the response of different accession to variable conditions of carbon sources and elicitors.

Materials and Methods

Cultures of five different accessions i.e., 281374, 383913, 342109, 347492, 331514 of C. asiatica were collected from NBPGR New Delhi, India. To study the effect of carbon source and elicitors on shoot multiplication MS media was used. Murashige and Skoog (MS) [15] media was prepared and pH was adjusted to 5.8 using 1 N HCl or 1 N NaOH solution. 0.8% plant agar was used to solidify the media. Sterilization of the media was done by autoclaving for 20 min at 121°C and 15 lb pressure. For experiment on elicitors and carbon sources, MS media was supplemented with 1.5 mg/L 6- Benzyl amino purine along with different elicitors {Malt extract (1 mg/L), Salicylic acid (1 mg/L), Jasmonic acid (1 mg/L)} and different carbon sources {Sucrose (3%) and fructose (3%)} separately. After the solidification of media, sterile shoot nodes from each accession were inoculated in culture tubes (25 × 150 mm) separately. The cultures were incubated at 26 ± 2°C under 16 h photoperiod and light intensity of 3000 lux for four weeks. Each and every experiment was done in triplicates. Visual data was recorded after 4th week of inoculation in terms of number of shoots and length of shoots for in vitro growth measurement.

Data analysis

Observations were recorded and are presented as means ± standard deviation of 3 biological replicates to estimate the variability between the accessions.

Results and Discussion

Effect of carbon source and elicitors on shoot regeneration was observed in five accessions of Centella asiatica . Observation was recorded as mean value of triplicate samples after four weeks of inoculation (Tables 1 and 2). Among the elicitors used, MS media supplemented with malt extract (1 mg/ltr) showed maximum number and maximum length of shoots (Figure 1). Maximum effect of malt extract was found on accession no. 281374 as maximum number of shoots i.e., 25 were reported in this accession followed by 342109 (16), 331514 (15), 347492 (14) and 383913 (10). Maximum average length was reported in accession number 347492 (3.07) followed by 281374 (2.35), 342109 (1.69), 331514 (1.75), 383913 (1.5).

medicinal-aromatic-plants-different-accession

Figure 1: In vitro culture of five different accession of Centella asiatica in malt extract (After four weeks of inoculation).

S No Accession Number Treatment No. of shoots
(M ± SE)
Length of shoot(cm.)
(M ± SE)
1 Accession No.281374 MS+BAP(1.5 mg/ltr)+ME(1 mg/ltr) 25 ± 1.52 2.35 ± 0.12
MS+BAP(1.5 mg/ltr)+SA(1 mg/ltr) 4 ± 1.15 1 ± 0.08
MS+BAP(1.5 mg/ltr)+JA(1 mg/ltr) 2 ± 1 0.75 ± 0.12
2 Accession No.383913 MS+BAP(1.5 mg/ltr)+ME(1 mg/ltr) 10 ± 0.57 1.3 ± 0.05
MS+BAP(1.5 mg/ltr)+SA(1 mg/ltr) 1 ± 0.33 1.5 ± 0.12
MS+BAP(1.5 mg/ltr)+JA(1 mg/ltr) 1 ± 0 0.5 ± 0.05
3 Accession No.342109 MS+BAP(1.5 mg/ltr)+ME(1 mg/ltr) 16 ± 3.46 1.69 ± 0.09
MS+BAP(1.5 mg/ltr)+SA(1 mg/ltr) 1 ± 0 2.5 ± 0.28
MS+BAP(1.5 mg/ltr)+JA(1 mg/ltr) 2 ± 0.57 0.75 ± 0.07
4 Accession No. 347492 MS+BAP(1.5 mg/ltr)+ME(1 mg/ltr) 14 ± 1.15 3.07 ± 0.12
MS+BAP(1.5 mg/ltr)+SA(1 mg/ltr) 5 ± 1.15 0.9 ± 0.10
MS+BAP(1.5 mg/ltr)+JA(1 mg/ltr) 5 ± 1.52 0.52 ± 0.03
5 Accession No. 331514 MS+BAP(1.5 mg/ltr)+ME(1 mg/ltr) 15 ± 1.15 1.43 ± 0.07
MS+BAP(1.5 mg/ltr)+SA(1 mg/ltr) 8 ± 2 1.75 ± 0.07
MS+BAP(1.5 mg/ltr)+JA(1 mg/ltr) 12 ± 2.88 1.66 ± 0.07

Table 1: Effect of different elicitors on number and length of regenerated shoots in five different accession of Centella asiatica after four weeks of inoculation. Values are expressed as mean ± Standard Error (M ± SE). MS: Murashige and Skoog medium; BAP: 6-Benzyl amino purine; ME: Malt Extract; SA: Salicylic acid; JA: Jasmonic acid.

S No Accession Number Treatment No. of shoots (M ± SE) Length of shoot (cm)
(M ± SE)
1 Accession No.281374 MS+Sucrose+BAP(1.5 mg/ltr) 8 ± 1.15 1 ± 0.06
MS+Fructose+BAP(1.5 mg/ltr) 2 ± 0.57 1.5 ± 0.16
2 Accession No.383913 MS+Sucrose+BAP(1.5 mg/ltr) 3 ± 0.57 0.27 ± 0.04
MS+Fructose+BAP(1.5 mg/ltr) 2 ± 0.57 0.75 ± 0.08
3 Accession No.342109 MS+Sucrose+BAP(1.5 mg/ltr) 5 ± 1.2 0.52 ± 0.02
MS+Fructose+BAP(1.5 mg/ltr) 2 ± 0.57 0.75 ± 0.10
4 Accession No. 347492 MS+Sucrose+BAP(1.5 mg/ltr) 16 ± 3.05 1.66 ± 0.15
MS+Fructose+BAP(1.5 mg/ltr) 5 ± 0.57 0.7 ± 0.05
5 Accession No. 331514 MS+Sucrose+BAP(1.5 mg/ltr) 10 ± 1.15 1.5 ± 0.08
MS+Fructose+BAP(1.5 mg/ltr) 3 ± 0.57 1 ± 0.09

Table 2: Effect of different carbon sources on number and length of regenerated shoots in five different accession of Centella asiatica after four weeks of inoculation. Values are expressed as mean ± Standard Error (M ± SE). MS: Murashige and Skoog medium; BAP: 6-Benzyl amino purine.

Two different carbohydrate sources i.e., sucrose and fructose were tested for their potential on shoot regeneration in five different accession of Centella asiatica and it was found that sucrose showed better shoot growth than fructose in different accession of Centella asiatica (Figure 2). Maximum number of shoots generation was recorded in MS media supplemented with Sucrose (3%). In case of sucrose as carbon source, maximum number of shoots was reported in accession number 347492 (16) followed by 331514 (10), 281374 (8), 342109 (5) and 383913 (3). Maximum average length was reported in accession number 347492 (1.66).

medicinal-aromatic-plants-asiatica-sucrose

Figure 2: In vitro culture of five different accession of Centella asiatica in sucrose (After four weeks of inoculation).

Order of other accession’s average length of shoots in sucrose experiment is 281374 (1.5) and 331514 (1.5), 342109 (0.75), 383913(0.75). These parameters can be used for maximum production of biomass and bioactive compounds. Focus can be drawn on high yielding accessions for secondary metabolite production. Hossain et al. [16] also reported similar results in C. asiatica. They concluded that sucrose showed best results as it helped in the production of maximum shoot length in presence of BA and Kinetin.

Conclusion

From the above study, it can be concluded that different carbon sources and elicitors have significant effect on the shoot formation of Centella asiatica as they have the capacity to enhance shoot multiplication as well as shoot length which ultimately increases the growth of the plant. Among the carbon source, sucrose showed better capability to enhance the growth of Centella asiatica than fructose. Accession no. 347492 showed maximum number of shoots in MS media containing sucrose. Malt extract showed the highest number of shoots generation among the other elicitors used. Accession no. 281374 showed maximum number of shoots regeneration in MS media containing Malt extract. Shoot proliferation can be used for production of important bioactive compound of this plant i.e., asiaticoside. This study not only finalized the appropriate elicitors and carbon source but also the high yielding accession of Centella asiatica . Further study will include the quantitative and qualitative analysis of various secondary metabolites like saponins, terpenoids, and alkaloids extracted from Centella asiatica .

Acknowledgements

The authors are grateful to the Department of Biotechnology, Delhi Technological University, Delhi for extending all the laboratory facilities towards successful completion of this investigation and National Bureau of Plant Genetic Resources for providing the plant materials.

References

  1. Jamil SS, Nizami Q, Salam M (2007) Centellaasiatica(Linn.) Urban A Review. Natural Product Radiance 6: 58-170.
  2. Tripathi G,Mishra S,Upadhyay P,Purohit S, Dubey GP (2015) Ethno pharmacological importance of Centellaasiatica with special reference to neuroprotective activity. Asian Journal of Pharmacology and Toxicology 3: 49-53.
  3. Bhavna D, Jyoti K (2011)Centellaasiatica: The elixir of life. International Journal of Research in Ayurveda & Pharmacy 2: 431-438.
  4. Bonte F, Dumas M, Chaudagne C,Maybeck A (1994) Influence of asiatic acid, madecassic acid and asiaticoside on human collagen I synthesis.Planta Med 60: 133-135.
  5. Evans WC (2002)Saponin, cardioactive drugs and other sterols.Pharmacognosy, Saunders 15: 303-304.
  6. Gohil KJ, Patel JA,Gajjar AK (2010)Pharmacological review on Centellaasiatica: A potential herbal cure-all. Indian J Pharm Sci72: 546-556.
  7. Das KM, Kumar B (2012) Ancient and pharmacological review onCentellaasiatica(Mandukparni): A potential herbal panacea. International Journal of Research and Reviews in Pharmacy & Applied Science 2: 1062-1072.
  8. Singh HG (1989) Himalayan herbs and drugs, importance and extinction threat. Journal of Medicinal Plants Research 10:47-52.
  9. Pandey NK, Tewari KC, Tewari RN, Joshi GC, Pande VN, et al. (1993) Medicinal plants of kumaonHimalaya. In: Dhar U (ed). Strategies for conservation of Himalayas,Himavikas Publication, Nanital, India 3: 293-302.
  10. Zhao J, Davis LC, Verpoorte R (2005) Elicitor signal transduction leading to production of plant secondary metabolites. BiotechnolAdv 23: 283-333.
  11. Patel H, Krishnamurthy R (2013) Elicitors in plant tissue culture. Journal of Pharmacognosy and Phytochemistry2: 60-65.
  12. Loc NH,Giang NT (2012) Effects of elicitors on the enhancement of asiaticoside biosynthesis in cell cultures of Centella (Centellaasiatica L. Urban). Chemical papers 66: 642-648.
  13. Panathula CS, Mahadev MD, Naidu CV (2014) Effect of different carbohydrates on invitro plant regeneration of Centellaasiatica (L.), an important antijaundicemedicinal plant. International Journal of Medicinal and Aeromatic Plants 4: 41-47.
  14. Saad AIM,ElshahedAM (2012) Plant tissue culture media, Recent advances in plant in vitro culture. Chapter 2. In Tech Publisher (Online book).
  15. Murashige T,Skoog F (1962) A revised medium for rapid growth and bioassays with tobacco tissue cultures.PhysiologiaPlantarum15: 473-497.
  16. HossainA,Hossain T, Ali R, Rahman M (2005) Effect of different carbon sources on in vitro regeneration of Indian Pennywort (Centellaasiatica L.). Pakistan Journal of Biological Science8: 963-965.
Citation: Kundu K, Roy A, Saxena G, Kumar L, Bharadvaja N (2016) Effect of Different Carbon Sources and Elicitors on Shoot Multiplication in Accessions of Centella asiatica. Med Aromat Plants 5:251.

Copyright: © 2016 Kundu K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Top