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Effect of salicylic acid and yeast extract on curcuminoids biosynthesis gene expression and curcumin accumulation in cells of Curcuma zedoaria
J Plant Biotechnol 2019;46:172-179
Published online September 30, 2019
© 2019 The Korean Society for Plant Biotechnology.

Truong Thi Phuong Lan · Nguyen Duc Huy · Nguyen Ngoc Luong · Hoang Tan Quang · Trinh Huu Tan · Le Thi Anh Thu · Nguyen Xuan Huy · Nguyen Hoang Loc

University of Sciences, Hue University, 77 Nguyen Hue St., Hue, Vietnam
University of Medicine and Pharmacy, Hue University, 6 Ngo Quyen St., Hue, Vietnam
Institute of Biotechnology, Hue University, Phu Thuong, Phu Vang, Thua Thien Hue, Vietnam
University of Education, Hue University, 34 Le Loi St., Hue, Vietnam
Correspondence to: e-mail: nhloc@hueuni.edu.vn
Received February 1, 2019; Revised May 21, 2019; Accepted July 10, 2019.
cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract

The aim of this study is to evaluate the effect of yeast extract (YE) and salicylic acid (SA) on the expression of curcuminoid-biosynthesis genes (CzDCS and CURS1-3), and accumulation of curcumin in Curcuma zedoaria cell cultures. The results showed that, in cells treated with YE or SA, the expression levels of curcuminoid genes were 1.14-to 3.64-fold higher than the control (untreated cells), in which the YE exhibited a stronger effect in comparison with SA. Curcumin accumulation also tended to be similar to gene expression, curcumin contents in YE-or SA-treated cells were 1.61-to 2.53-fold higher than the control. The SA treatment at the fifth day of culture stimulated the curcumin accumulation and expression in all four genes compared to that at the beginning. While the YE treatments gave different results, the CzCURS1 and CzCURS3 genes were expressed strongly in cells that were treated at the beginning. However, the CzDCS and CzCURS2 genes showed the opposite expression pattern, they were activated strongly in the treatments at day five of the culture. However, the content of curcumin reached its maximum value on the fifth day of culture in all investigations.

Keywords : Curcuma zedoaria, curcuminoid genes, elicitor, salicylic acid, yeast extract
Introduction

Zedoary (Curcuma zedoaria Rosc.) is a perennial herb that belongs to the Zingiberaceae family found in tropical countries such as India, Japan, Thailand (Lobo et al. 2009), and Vietnam (Loi 2004). The rhizome of zedoary has been used in traditional and folk medicine for the treatment of menstrual disorders, dyspepsia, cough, vomiting, inflammations, hepatitis and diarrhoea (Azam et al. 2017).

Curcuminoid is a mixture of curcumin and its derivatives such as bisdemethoxycurcumin and demethoxycurcumin isolated from the rhizome of zedoary (Lobo et al. 2009) and other Curcuma species (Katsuyama et al. 2009; Lee et al. 2014; Gilani et al. 2015; Behar et al. 2016). Previous studies suggested that curcuminoids, especially curcumin, have valuable biological activities such as antioxidant, antitumor, anti-inflammatory, anti-acidogenic, radioprotective and neuroprotective properties (Hayakawa et al. 2011; Amalraj et al. 2017).

Genes involved in the pathway of curcuminoid metabolism in Curcuma longa included two type III polyketide synthase genes, DCS (diketide-CoA synthase) gene and CURS1 (curcumin synthase 1), CURS2 and CURS3 genes, and their expression levels were reported by Katsuyama et al. (2009a, b). Brand et al. (2006) characterized another type III polyketide synthase gene, chalcone synthase (CHS) gene, in Wachendorfia thyrsiflora. This gene is also involved in the biosynthesis of curcuminoids. Behar et al. (2016) analysed expression of genes which participate in curcuminoid biosynthesis in C. caesia including DCS, CURS, CURS2, CURS3 and CHS1. All the genes exhibited a higher expression level in the rhizome compared to leaves. Sandeep et al. (2017) evaluated expression of CURS gene in C. longa at different experimental areas and harvesting phases towards cultivation for high curcumin yield. In a recent study, we also found four similar curcuminoid genes (named CzDCS, CzCURS1, CzCURS2 and CzCURS3 with the corresponding accession numbers are MF663785, MF402846, MF402847, and MF987835) in zedoary (C. zedoaria, Cz) and their expression in rhizome and callus (Lan et al. 2018).

Elicitors are the chemical compounds which have been used to modify the pathway of secondary metabolism in order to enhance of the biosynthesis of pharmaceutically significant metabolites or phytopharmaceuticals in plant cell cultures (Jeong and Park 2005; Namdeo 2007). Accordings to Abraham et al. (2011), yeast extract (YE) has been applied in plant tissue culture due to its ability to stimulate the defence mechanism, which leads to increase production of secondary metabolites. Salicylic acid (SA) is recognized as one of important signals in plant defense response and are also widely used for secondary metabolite production in plant cell cultures (Badrhadad et al. 2013). The present work therefore investigated the effect of elicitors such as YE and SA on activation of curcuminoid genes in callus cells of zedoary. Our results provided the first evidence for role of SA and YE as positive regulators of elicitor-induced gene expression in this plant species.

Materials and Methods

Cell culture and elicitation

Buds (1.5 cm) from the rhizome of zedoary (C. zedoaria Roscoe) distributed in Thua Thien Hue province (Vietnam) were sterilized and cultured on the MS (Murashige and Skoog, 1962) medium including 2% (w/v) sucrose and 0.8% (w/v) agar, supplemented with 20% (v/v) CW (coconut water), 3 mg/L BAP (benzylaminopurine), 0.5 mg/L IBA (indolebutyric acid) and 1.5 mg/L AgNO3 for shoot multiplication. Single shoots (3~4 cm) were isolated from the shoot clusters to develop into plantlets on the MS medium supplemented with 20% (v/v) CW, 2 mg/L NAA (naphthaleneacetic acid) and 1.5 mg/L AgNO3. Leaf-bases (0.5×0.5 cm) of plantlet were cultured on the MS medium supplemented with 3 mg/L 2,4-D (2,4-dichlorophenoxyacetic acid) and 3 mg/L BAP for callus induction, callus was then subcultured on the MS medium with 1 mg/L 2,4-D and 1 mg/L kinetin for proliferation.

Cell culture of zedoary was established by agitating 3 g of callus in 250 mL Erlenmeyer flask containing 50 mL of liquid MS medium including 2% (v/v) of sucrose, supplemented with 3 mg/L of 2,4-D and 3 mg/L of BAP until a suspension of free cells formed. The suspension was then cultured on a rotary shaker at a speed of 150 rpm for 12 days to produce biomass (Fig. 1).

Fig. 1.

In vitro cultures of zedoary. A: plantlet, B: callus, C: suspension cells, D: fresh cell biomass


Three gram of 12 day old cells (at near the end of the growth phase) were subcultured on the same medium but supplemented with 100 µM of SA or 1 g/L of YE at various culture times to investigate changes in expression of curcuminoid genes related to curcumin biosynthesis.

Salicylic acid solution was prepared as a stock solution by completely dissolved 0.138 g SA into 5 mL of 100% ethanol. Five milliliters of water was added to solution to a final concentration of 100 mM and filtrated through Millipore™ Membrane Filter (0.22 µm pore size). After then, 50 µL of stock solution were added to 50 mL liquid medium to a concentration of 100 µM. Yeast extract was directly added to medium to a concentration of 1 g/L before autoclaving.

The cell culture was incubated at 25±2°C with a photoperiod of 10 h daylight at an light intensity of approximately 6.75 µmol/s/m2.

Gene expression

Expression level of curcuminoid genes (CzDCS, CzCURS1, CzCURS2 and CzCURS3) in various zedoary samples was analysed by semi-quantitative RT-PCR (reverse transcription-polymerase chain reaction) with the primers designed based on their specific regions (Table 1 and Fig. 2)

Primers used for RT-PCR amplification of the specific regions of curcuminoid-biosynthesis genes in zedoary

GenePrimer namePrimer sequence (5’- 3’)Amplified length (bp)Annealing temperature (°C)
CzDCSID-FTGCTCCGAGGTCACCGTGC27255
ID-RGGTCAGCCCAATTTCGCGG

CzCURS1IC1-FCCGCTGGAAGGAATTGAAAAA28655
IC1-RGAGCTTGTCCGGGCTCAGCTG

CzCURS2IC2-FCCACCTCCGCGAGGTGGGGCT21155
IC2-RGCGGTGGCCAGCTTGCTCTGT

CzCURS3IC3-FCACCTGAGGGAAATCGGCTGG20250
IC3-RGCGAGCTTCCCCTGTTCCAGC

Fig. 2.

Alignment of partial sequences of curcuminoid genes. Black boxes are regions used to design primers for RT-PCR


Fresh samples of 200 mg were ground to a fine powder by using liquid nitrogen. Total RNAs of samples were extracted by InviTrap Spin Plant RNA Mini Kit (STRATEC Biomedical, Germany) and 1st cDNA strand was synthesized by First Strand cDNA Synthesis Kit (Thermo Scientific), both are under the manufacturer’s instructions.

PCR amplification was performed as follows: 2 µL cDNA, 10 pmol each primer, 6 µL 2× GoTaq® Green Master Mix (Promega), and ddH2O in a final volume of 12 µL. The reaction was performed in PCR machine (Veriti 96 Well Thermal Cycler, ABI) with a template denaturation of 95°C for 2 min; followed by 20~30 cycles of 95°C for 30 s, 50-55ºC for 30 s (Table 1), and 72ºC for 30 s; and a final extension of 72ºC for 10 min.

Three microliters of each PCR product was used for electrophoresis on 1% (w/v) agarose gel at 70 V and intensities of DNA bands were calculated using ImageJ program (version: k 1.45).

High performance liquid chromatography

Cell biomass was dried at 50°C to a constant weight, then ground into a fine powder. Two grams of powder was soaked in 20 mL of 70% (v/v) ethanol for 30 min at 30°C and then treated by ultrasound on T700/H machine (Elma, Germany). The sample was filtered with Whatman filter paper (No. 1), the residue was extracted again with the same solvent for several times until the solvent layer became colorless. After filtration with Whatman paper, the filtrates were mixed and the solvent was removed at 70°C by using a vacuum rotary concentrator (Heidolph, Germany). The concentrate was dissolved by 70% (v/v) ethanol to 10 mL (curcumin extract) and filtered through Minisart 0.25 µm membrane (Sartorius, Germany), the extract was then diluted two times for subjecting HPLC at ambient temperature by using a Hypersil™ MOS C8 LC Column (5 µm, 4.6×150 mm).

HPLC condition was as follows, flow rate: 1 mL/min, run time: 10 min, detector wavelength: 420 nm, stationary phase: silica gel (reverse phase) and mobile phase: acetonitrile/2% acetic acid (35/65, v/v). Ten microliters of curcumin extract were injected the chromatographic column using Hamilton syringe. HPLC analysis was performed on a Spectra System (Thermo Electron).

All solvents were of analytical grade and were purchased from Sigma and Merck & Co., Inc. The standard curve of curcumin (Sigma) in ethanol at different concentrations from 1~20 µg/mL is used for determination of the curcumin in the extract. Curcumin content of the extract is calculated based on the peak area with retention time corresponding to the standard curcumin.

Statistical analysis

The experiments were done in triplicate, n=10 for each replication in in vitro culture experiments. The data were analyzed as means followed by one-way ANOVA (Duncan’s test, p<0.05).

Results and Discussion

Growth of zedoary cells

Zedoary cells in shaking culture were harvested every two days to determine their biomass propagation. Figure 3 shows the growth increased from day 2 to day 14 and then decreased at days 16 and 18. Maximum biomass of approximately 8.3 g of fresh weight (per 50 mL of cell culture volume) is equivalent to 0.73 g of dry weight. Twelve day-old cells were subcultured in the fresh medium for elicitation, cell biomass was then harvested at 14th day of subculture to evaluate expression level of curcuminoid-biosynthesis genes and their curcumin accumulation.

Fig. 3.

Time course of C. zedoaria cell growth. Data are means ± SE of three biological replicates


Table 2 shows the growth of C. zedoary cells in all treatments was inhibited significantly, highest biomass per 50 mL of cell culture volume is only approximately 5.2 g fresh weight (0.5 g dry weight) versus about 8.3 g fresh weight (0.73 g dry weight) of the control. In general, the effect of exogenous elicitors on in vitro growth depends on the plant species, developmental stage, and the elicitor concentration. Negative effects of SA and YE on the growth have also been observed in different in vitro culture systems as in Sophora flavescens (Yamamoto et al. 1995), Dendrobium huoshanense (Wang et al. 2009), Salvia miltiorrhiza (Zhao et al. 2010), a mutant of Lotus japonicus, named Ljsym4-2 (Bastianelli et al. 2010), Centella asiatica (Loc et al. 2017).

Effect of elicitors on the growth and curcumin accumulation of zedoary cells

ElicitationCell growthCurcumin (mg/g)

Fresh weight (g/50 mL)Dry weight (g/50 mL)
YE(1)5.26b0.49b0.92d
YE(2)4.88c0.42c1.44a
SA(1)3.45d0.31d1.14c
SA(2)3.16d0.30d1.32b
Non-elicited cells8.26a0.73a0.57f
10 month-old rhizome--0.78e

Elicitors were added in the medium at the beginning of culture (1) and after 5 days of culture (2). Different letters in a column indicate significantly different means (Duncan’s test, p < 0.05).


Effect of elicitors on expression of curcuminoid-biosynthesis genes

In the present work, 1 g/L YE or 100 µM SA was added to the medium at two time-points, at the beginning and the 5th day of culture. The other concentrations and treatment time points of SA and YE were also investigated but curcumin accumulation found in cells is insignificant (data not shown).

Although semi-quantitative RT-PCR will not produce as good quality results as those of quantitative PCR, Lenka et al (2012) and Dewanjee et al (2014) argued that it is still sufficient for differential gene expression analysis. Our results of semi-quantitative RT-PCR in 25 cycles exhibited that expressions of curcuminoid genes in treated cells are higher than that of untreated cells (Fig. 4). Expression levels of genes were evaluated through the intensities of DNA bands in agarose gel showed that they are 1.14 to 3.64-fold higher than the control (Fig. 5). Expression of curcuminoid genes in treated and untreated cells was not different significantly in 20 and 30 cycles of amplification (data not shown).

Fig. 4.

RT-PCR amplification of the specific regions of curcuminoid genes in C. zedoary. 1: control (untreated cells), 2 and 4: cells treated with salicylic acid and yeast extracts at the beginning of culture, respectively. 3 and 5: cells treated with salicylic acid and yeast extracts after five days of culture, respectively. M: DNA size marker (1 kb DNA Ladder)


Fig. 5.

Intensities of DNA bands from semi-quantitative RT-PCR of the specific regions of curcuminoid-biosynthesis genes. 0 and 5: elicitors were added in the medium at the beginning and after five days of culture, respectively. Data are means ± SE of three biological replicates


In general, YE showed a higher elicitation effect compare to SA, the total intensity of DNA bands reached a maximum value of 71528 versus 23455 (approx. 3-fold) from treatments at day 0 and 57397 versus 31625 (approx. 1.8-fold) from treatments at day 5. Data in Figure 5 also indicated that the SA treatment at 5th day of cell culture stimulated the stronger expression in all four genes, CzDCS and CzCURS 1~3, compared to that at the beginning. While YE treatments gave different results, the CzCURS1 and CzCURS3 genes were expressed strongly in cells which treated at the begining, but the CzDCS and CzCURS2 genes showed the opposite effect, they were activated strongly in the treatments at day 5 of the culture. Overall, the YE treatment at the beginning resulted in the total intensity of all four genes is about 1.3-fold higher than that at 5th day of culture.

One issue with our approach for gene expression analysis was that a proper internal control such as chalcone synthase is not accessible since the such gene sequences in C. zedoaria are not yet made available on Genbank. The scarcity of sequence information of C. zedoaria also makes it impossible for including pathogenesis related genes in our elicitation experiments to validate that changes in genes expressions were due to the effects of used elicitors. To ensure that the differences observed in gene expression levels are genuine, we included total RNA in our analysis to show that equal amounts of RNA, as well as cDNA were used for the semi-quantitative RT-PCR.

Several previous studies also found an enhanced expression of elicitor-induced genes in plant cell cultures such as OsWRKY53 gene in rice cells treated with fungal cerebroside (Chujo et al. 2007), defense genes in parsley (Petroselinumcrispum) cells treated with methyl jasmonate (Ellard-Ivey and Douglas, 1996), or defense genes in cells of two grapevine species (Vitis rupestris and V. vinifera) treated with Harpin (Qiao et al. 2010). Especially, Park et al. (2016) showed that YE and silver nitrate can induce the higher expression of phenylpropanoid biosynthesis genes and enhance accumulation of rosmarinic acid in Agastache rugosa cell culture. In another report, we determined the influence of SA on expression of genes involved in the pathway of phytosterol and triterpene biosynthesis in in vitro centella (Centella asiatica) cells (Loc et al. 2016).

The effect of the exogenous SA and YE on the gene expression level depends on the plant species, developmental stage, and elicitor concentration. Although, both YE and SA trigger the accumulation of endogenous jasmonic acid that up-regulates the expression of key genes involved in secondary metabolism of plants (Rahimi et al. 2014). Our results indicated that in comparison to abiotic elicitor is SA, YE biotic elicitor is more effective in enhancing the expression of curcuminoid-biosynthesis genes.

Effect of elicitors on curcumin production

Curcumin is one of three components of curcuminoid group found in Curcuma species including demethoxycurcumin and bisdemethoxycurcumin. In the curcuminoid pathway in C. longa which started by phenylalanine, CzDCS metabolizes feruloyl-CoA from p-coumaroyl-CoA into feruloyldiketide-CoA, then CzCURS1-3 will convert feruloyldiketide-CoA into curcumin. Besides, CzCURS3 can produce demethoxylcurcumin from feruloyldiketide-CoA. Simultaneously, CzDCS also participate the transformation of p-coumaroyl-CoA into p-coumaroyldiketide-CoA, and then CzCURS1-3 or single CzCURS3 will metabolize this compound into demethoxycurcumin and bisdemethoxycurcumin (Katsuyama et al. 2009).

The correlation between expression of curcuminoid genes and curcumin biosynthesis in C. zedoaria cells was found through RT-PCR amplification and HPLC analysis. The effect of YE treatment on curcumin production is higher than that of SA and the control. Curcumin content from cells treated with SA and YE at 5th day of culture is approximate from 1.2-to 1.6-fold higher than that treated at the beginning, 1.32 vs 1.14 mg/g and 1.44 vs 0.92 mg/g (Table 2). In the YE treatment, the results on the curcumin contents did not appear to correspond to expression levels of curcuminoid genes. Total intensity of PCR products obtained from treated cells at the beginning of culture is stronger than that at 5th day (Fig. 5). The cause may be the curcuminoid genes contributed to not only in the biosynthesis of curcumin but also demethoxycurcumin and bisdemethoxycurcumin.

Generally, our results are also similar to several previous studies. The accumulation of major products of secondary metabolism in plant cell cultures has been correlated with the expression of coordinate genes under the effect of suitable elicitors. For example, activation of expression of phenylpropanoid genes and accumulation of furanocoumarin in Petroselinum crispum cells treated with methyl jasmonate (Ellard-Ivey and Douglas, 1996) or rosmarinic acid in Agastache rugosa cells treated with YE and silver nitrate (Park et al. 2016).

In conclusion, expression levels of curcuminoid-biosynthesis genes in YE-and SA-treated C. zedoaria cells were 1.14 to 3.64-fold higher than those in untreated cells, in which YE at 1 g/L showed a higher stimulation effect for gene expression than SA at 100 µM, 1.8-to 3-fold after 9 and 14 days of treatment, respectively. Curcumin accumulation in treated cells was 1.61-to 2.53-fold higher than the control.

Acknowledgments

This work was funded by Grant from Hue University, Vietnam (Code number: DHH 2016-04-56).

Conflict of interest

We declare that there is no conflict of interest regarding the publication of this article.

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