- Original Article
- Open Access
Influence of harvest stage on the pharmacological effect of Angelica dahurica
Botanical Studies volume 59, Article number: 14 (2018)
Baizhi (Angelica dahurica) has been widely used as a traditional Chinese herbal medicine, functional food and cosmetic product ingredient, mostly because of the high furanocoumarin compounds in roots. The cropping system of Baizhi with its unique summer dormancy feature, is easily affected by the transition of its growth stages. The aim of this study was to analyze the quantity (size, form and dry weight [DW]) and quality (antioxidant and furanocoumarin content) of taproot and lateral root from three growth stages of Baizhi; vegetative (V-stage), summer dormancy (S-stage) and bolting stage (B-stage).
Root length and diameter were lower at V-stage than the other two stages, and S-stage had higher lateral root to total root ratio. However, the highest root DW was observed at S-stage. Antioxidant activity was revealed by 2,2-diphenyl-l-picrylhydrazyl and Fe2+ chelating assay, and the content of six furanocoumarin compounds, including xanthotoxin, bergapten, oxypeucedanin, imperatorin, phellopterin and isoimperatorin, was analyzed by liquid chromatography. Although the antioxidant activity was less at S-stage than the other stages, furanocoumarin contents showed little variation.
Considering the high DW and stable furanocoumarin composition, S-stage is the best harvest stage than the other stages because of its richer total pharmacological content.
Baizhi (Angelica dahurica BENTH. et HOOK.) is a perennial Apiaceae plant, originated in Taiwan (Wang et al. 2001) and found abundantly in Korea, China, Japan and Russia (Sarker and Nahar 2004; Li et al. 2014a, b). The root of Baizhi is a traditional Chinese medicine known for its antipyretic and analgesic properties since thousands of years ago. Today, researchers are analyzing the multiple biological functions and investigating the chemical constituents of Baizhi.
The multiple pharmacological effects of Baizhi root extracts include antioxidation (Piao et al. 2004), anti-inflammatory (Pervin et al. 2014), antiproliferative (Yousif et al. 1999), skin whitening (Cho et al. 2006), anti-tumor (Kim et al. 2007), antimicrobial (Kwon et al. 1997) and anti-Alzheimer effects (Marumoto and Miyazawa 2010). These effects are believed to be attributed to the plant’s rich furanocoumarin compounds such as imperatorin and isoimperatorin. Imperatorin has anti-inflammatory (Garcia et al. 2000), anticonvulsant (Luszczki et al. 2007), hepatoprotective (Oh et al. 2002), myorelaxant (Chiou et al. 2001), vasodilator (Wang et al. 2016) and anti-cancer effects (Li et al. 2014a, b). Isoimperatorin has anti-inflammatory (Abad et al. 2001), antiallergic (Ryu et al. 2001) and antimicrobial effects (Suleimenov 2009). Beside the pharmacological effects of Baizhi furanocoumarins, root extracts contain a variety of phenolic compounds that are connected to its strong antioxidant activity (Wang et al. 2017). Recently, foods with antioxidant effects become valued for their ability to remove reactive oxygen species, which oxidize lipids, DNA, membranes and proteins, and are involved in atherosclerosis, cancers and other diseases (Leopold and Loscalzo 2009).
Growth of Baizhi has three stages: V-stage, vegetative stage; B-stage, bolting stage; and S-stage, summer dormancy stage. Summer dormancy in herbaceous perennials is characterized by: (1) cessation or reduction of leaf meristem growth; (2) senescence of most or all above-ground herbage; (3) possible dehydration of the bases of the youngest leaves at the base of vegetative tillers; and (4) possible preceding formation of resting organs in the form of swollen basal internodes (corm/tuber) or swollen leaf bases (such as bulbs) (Volaire and Norton 2006). Although a report indicated NtFTs are target genes of temperature signal pathway to regulate the dormancy process in Narcissus tazetta var Chinensis (Feng et al. 2015), the relationship between biochemical regular and summer dormancy still lacked conclusive researches (Gillespie and Volaire 2017). For environmental drivers, vegetative organs develop under increasing day-length and temperature at the end of spring will induce summer dormancy (Volaire et al. 2009). In addition, water deficit was shown to be an induction factor for P. bulbosa L. (Ofir and Kigel 2007) and D. glomerata (Volaire 2002). Accordingly, after the V-stage, instead of transitioning to the B-stage, Baizhi enters summer dormancy (S-stage) to survive hot and dry environmental conditions. Its above-ground portions die during summer, and its root becomes the storage organ and therefore becomes heavier, a mechanism that implies more harvest yield than at other growth stages. Thus, it is expected that Baizhi roots should be harvested at S-stage, although the S-stage is not necessary to complete the regular life cycle of Baizhi.
A previous study arranged a series of sowing dates, from September to November, to analyze the B-/S-stage ratio in Baizhi (Xingfu et al. 1999). However, few analyses have revealed the content of pharmacological compounds in Baizhi roots extracted from different stages. Accordingly, the quantities in root may change during the growth stages. For example, with Angelica sinensis (known as Danggui in China), a well-known functional food for its roots, the growth stage is the most important factor affecting functional compound composition (Lü et al. 2009). Another study indicated that the content of six phthalides and four aromatic acids in A. sinensis varied with harvest timing (Qian et al. 2013).
In this study, we aimed to determine the functional activities of Baizhi roots at different growth stages, specifically the S-stage, which rarely occurs in other root-based medicinal plant species. To this end, we determined the activity of six furanocoumarin compounds, xanthotoxin, bergapten, oxypeucedanin, imperatorin, phellopterin and isoimperatorin, and antioxidants in Baizhi primary taproots and lateral roots at V-, S- and B-stages. The results will provide experimental proof for the harvest timing of Baizhi, especially for functional quality.
Materials and methods
The Baizhi field experiment of our study was grown in year 2014–2015 on a sandy loam soil at the Hualien District Agricultural Research and Extension Station (121°33E, 23°58N), Council of Agriculture, Executive Yuan. The 30 main plots 10 × 1.2 × 0.3 m (L × W × H) were sown in October and November 2014. Seed was initially sown to dry seedbeds and transplanted as one plant per hill to the puddled field plots at 3–4 leaves stage. The site soils had pretreated (2 weeks before transplantation) with organic matter (N:P2O5:K2O = 4.9:2.1:1.9; 8000 kg ha−1). The experiment was conducted one plant per hill to the puddled field with regular water application. Hills were spaced at a distance of 120 cm with 60 cm between planted rows (hill spacing = 120 cm × 60 cm). During the culture period, the total rainfall is about 900 mm, the mean air temperatures range from about 17 to 29 °C, the mean monthly sunshine hours range from 70 to 230 h. It was harvested at the three harvest stages, vegetative (V-stage), bolting (B-stage) and summer dormancy (S-stage), during the following year in May, July and August based on plant appearance (Fig. 1). Ten plantlets were harvested at each stage. The taproots and lateral roots (Fig. 1d) were separated, and the length, diameter and fresh weight were measured. The roots were then sliced, and part of the fresh root slices were freeze-dried (LYPH. LOCK 18, Labconco, USA) as HPLC–DAD samples; residues were completely dried in a 40 °C oven. The total weight of the two parts of dry roots were the dry weight.
Reagents and chemicals
All solvents were purchased from Merck (Darmstadt, Germany) and were of analytical grade or high-performance liquid chromatography (HPLC) grade. 1,1-Diphenyl-2-picrylhydrazyl (DPPH) and (3-(2-pyridyl)-5,6,diphenyl-1,2,4-triazine-p, p′-disulfonic acid monosodium salt hydrate were from Merck, and Fe2+ chloride tetrahydrate ferrozine, and furanocoumarin compound standards, including xanthotoxin, bergapten, oxypeucedanin, imperatorin, phellopterin and isoimperatorin were from Merck. The standards for HPLC with diode-array detection (HPLC–DAD) were dissolved in methanol to a concentration of 100 μg/ml and were stored at − 20 °C.
Root extracts and sample processing
Freeze-dried root slices were crushed to a power by using a high-speed disintegrator (Solar Energy Co, Taiwan). Extraction for HPLC–DAD was performed as described (Shiau et al. 2011) with some modifications. Methanol (20 ml) was added to 0.2 g ground powder, vortexed and let stand for 30 min. The powder with methanol was then ultrasonic shocked (DC600H, Delta, Taiwan) for 30 min, then centrifuged at 3320 rcf for 3 min. The supernatant was collected and the residue was re-extracted under same conditions for complete extraction. Finally, the supernatants were mixed and filtered through a 0.2-µm Acrodisc Syringe Filter (Pall, USA) before being collected in the Automatic Sampler-approved certified vials (Agilent, USA). Antioxidant assay extraction was performed as described (Shimada et al. 1992) with some modifications. Methanol (20 ml) was added to 1.0 g ground powder; vortexed and shaken overnight (50 rpm), then centrifuged at 3320 rfc for 3 min. The supernatant was collected as the sample.
To identify the furanocoumarin compounds in root extracts, 25 µl samples were separated by using an analytical column (Syncronis C18, 250 × 4.6 mm, 5 µm particle; ThermoFisher, USA) with flow rate 1.0 ml/min at 30 °C and absorbance 310 nm monitored by the ThermoFisher LC system (ThermoFisher, USA) equipped with a ThermoFinnigan UV detector and ThermoFisher Automatic Sampler. The column was protected by a C18 Guard column (HI-5C18-10C5, Hichrom, UK). A binary gradient was used for H2O (Solvent A) and methanol (Solvent B). Optimized pigment separation was achieved with a linear gradient of 40–20% Solvent A for 0–5 min, 20–10% Solvent A for 5–7 min, and 10–0% Solvent A for 7–9 min.
DPPH radical scavenging activity was as described (Shimada et al. 1992) with some modifications. The DPPH solution in methanol (0.4 mM) was prepared daily, and antioxidant samples were diluted or concentrated to at least seven concentrations. An amount of 50 µl sample solutions was loaded on a 96-well plate. Each concentration was loaded in six wells. Three were mixed thoroughly with 150 µl fresh DPPH solution (A1) and the others were mixed thoroughly with 150 µl methanol (A2). Pure methanol was used as the control (C1, C2). The loaded 96-well plates were incubated for 30 min in the dark, then the decrease in absorbance of light at 517 nm was measured. The DPPH radical scavenging effects were calculated as [1 − (A1517 − A2517)/(C1517 − C2517)].
Fe2+ chelating assay
Fe2+ chelating activity was measured as described (Dinis et al. 1994) with some modifications. Antioxidant samples were diluted or concentrated to at least seven concentrations. The Fe2+ chloride tetrahydrate solution in methanol (12 mM) was prepared, and 10.5 µl of this solution was mixed thoroughly with 1400 µl sample solution. Ferrozine solution in methanol (5 mM) was prepared. An amount of 200 µl sample solution was loaded on 96-well plates, with each concentration loaded in six wells. Three were thoroughly mixed with 20 µl ferrozine solution (A1) and the others were thoroughly mixed with 150 µl methanol (A2). Pure methanol was used as the control (C1, C2). The loaded 96-well plates were left to stand for 5 min, then the decrease in absorbance of light at 562 nm was measured. The Fe2+ chelating effects were calculated as [1 − (A1562 − A2562)/(C1562 − C2562)].
Data were analysed by using ANOVA. Source of variation was harvest stage. Significant differences by harvest stage were calculated by the Fisher least significant difference (LSD) tests (p < 0.05). Data are expressed as mean ± SD. The IC50 value of DPPH radical scavenging activity and Fe2+ chelating activity was predicted by Loess regression. All analyses involved use of R (version 3.2.2) software. p < 0.05 was considered statistically significant.
Root weight, length, diameter and moisture content
The transition of Baizhi from vegetative to bolting or summer dormancy, and subsequent root mass is determined by sowing dates (Xingfu et al. 1999), fertilizing management (Derong et al. 1999) and environmental factors such as latitude. Root length and diameter were lower at V-stage than the other two stages, with no significant (p < 0.05) difference between B- and S-stage. In Chinese medicine market, lateral roots of ginseng were commercialized independently, which termed as ginseng “fibers” or “beards”. To this, root samples were divided into ‘Taproot’ and ‘Lateral root’ as shown in Table 1. The root lengths were 23.91 ± 1.97, 29.60 ± 5.46 and 30.40 ± 5.83 cm at V-, B- and S-stage, respectively, and the root diameters were 76.45 ± 17.92, 106.93 ± 20.08 and 106.87 ± 38.41 cm, respectively. Root dry weight was highest at S-stage and lowest at B-stage. For taproots, the DW was 2.4 times greater at S- than V-stage and was about 2.7 times greater than at B-stage. For lateral roots, the DW was about 2.2 times greater at S- than V-stage and about 6.8 times greater than at B-stage. V-stage had the highest lateral root to total root ratio, and the proportions of lateral roots were about 26, 11 and 25% at V-, B- and S-stage, respectively. The findings could be explained by a portion of the biomass contributing to the growth of bolting, which may lead to about 2 m of flower moss. In contrast, the above-ground portions die during S-stage. Accordingly, harvesting Baizhi at S-stage rather than at V- or B-stage would allow for better yield. The variation in shoot may affect the harvest weight of root.
Extracts of Baizhi root have anti-oxidant properties (Pervin et al. 2014; Wang et al. 2017). Both reports have successfully used BHT as a standard to determine the antioxidant activity. Accordingly, in our study, we focused on the content of functional compounds in different harvest stages. We determined DPPH scavenging activity and Fe2+ chelating assay by abundant samples with statistical results without the usage of BHT. First, we determined the antioxidant activity of the three stages by DPPH assay and observed a dose-dependent relation in DPPH scavenging activity of Baizhi root extracts (Fig. 2a, b). For taproots, the IC50 value of the extracts were 5.70 ± 4.54, 6.46 ± 3.06 and 10.92 ± 3.82 mg/ml at V-, B- and S-stage, respectively (Table 2). The activity was about 2 times less at S-stage than the other two stages. However, from Table 1, for taproot, the DW was about 2.5 times greater for S-stage than the other stages. The low activity for S-stage may be due to its high DW, which mostly consists of storage compounds such as starch. For extracts of lateral root, the three stages did not differ in activities. The IC50 value of the lateral root extracts were 5.07 ± 5.20, 6.76 ± 5.37 and 6.12 ± 5.12 mg/ml at V-, B- and S-stage, respectively (Table 2). Furthermore, the DW of lateral roots was about 12 times greater at S-stage than the other stages, which indicates that 12 times total activity could be obtained from S-stage than the other stages. Taken together, the highest DPPH radical scavenging activity was obtained from roots harvested at S-stage.
We also determined the antioxidant activity of roots by Fe2+ chelating assay and found a dose-dependent relation in Fe2+ chelating assay of Baizhi root extracts (Fig. 2c, d). For taproots, the IC50 value of the extracts were 2.52 ± 7.13, 1.66 ± 1.70 and 11.94 ± 6.09 mg/ml for V-, B- and S-stage, respectively (Table 2). The activity was about 5 times less at S-stage than the other two stages (Table 2). Activity in lateral roots did not differ among the stages. The IC50 value for lateral root extracts were 2.55 ± 6.13, 1.90 ± 1.74 and 2.65 ± 6.33 mg/m for V-, B- and S-stage, respectively (Table 2). However, the DW was about 2.5 times greater at S-stage than the other stages. Hence, the active compounds for DPPH and Fe2+ chelating mechanisms differed. Baizhi root harvested at S-stage provided antioxidant activity primarily via a DPPH radical scavenging instead of Fe2+ chelating mechanism.
Characterization of six furanocoumarin compounds in Baizhi root
In traditional Chinese medicine, crude Baizhi root materials are used as medicine or functional food for antipyretic and analgesic activities because of abundant furanocoumarin compounds (Li et al. 2014a, b). For example, isoimperatorin, imperatorin and oxypeucedanin may be useful for treating Alzheimer disease (Marumoto and Miyazawa 2010). By analyzing the inhibitory activity on LPS-induced PGE2 production, it has been demonstrated that Isoimperatorin, imperatorin and phellopterin have potential as anti-inflammatory drugs (Ban et al. 2003; Deng et al. 2015). For other furanocoumarin compounds, xanthotoxin, isoimperatorin, imperatorin and oxypeucedanin have anti-cancer abilities (Kim et al. 2007).
The chemicals described above involve major furanocoumarin compounds, which we extracted from Baizhi root for HPLC–DAD chromatogram assay; seven clear peaks were obtained. By using reference compounds, we identified peaks 1, 2, 4, 5, 6 and 7 as xanthotoxin, bergapten, oxypeucedanin, imperatorin, phellopterin and isoimperatorin, respectively (Fig. 3) and the chemical structures are in Fig. 4. Then, we analyzed these six furanocoumarins in Baizhi root and found different patterns of furanocoumarin compounds from each harvest stage. The furanocoumarin content in taproot (or lateral root) at each harvest stage showed different patterns (Fig. 5). Oxypeucedanin had the highest yield of the six furanocoumarins (1.5–3.0 mg/g) and the other five yielded from 0.15 mg/g (bergapten) to 1.6 mg/g (phellopterin). The yield of each compound varied less than 50% at different harvest stages except for isoimperatorin from taproot. Similarly, the yield of taproot and lateral root varied less than 50% except for imperatorin and isoimperatorin at B-stage. Additionally, we have also analyzed the furanocoumarin content in shoot (above ground part) of V stage, only imperatorin was detected as about 0.21 mg/g.
To analyze the total amount of the six furanocoumarins in Baizhi roots, the results of harvest yield and six furanocoumarin contents were integrated (Fig. 6). Total furanocoumarin content was highest at S-stage. Also, furanocoumarin content was generally higher at S-stage than the other two stages; especially, the yield of xanthotoxin, bergapten and phellopterin was 2 times higher at S-stage than the other 2 stages. This result strongly supports that S-stage is the best harvest stage than the other stages because of its richer total furanocoumarin content.
The root of Baizhi has been used as a functional food and traditional medicine. In this study, we analyzed the antioxidant activity and total furanocoumarin content of Baizhi root and concluded that the summer dormancy stage is the best stage for harvesting.
Furanocoumarins are believed to function as phytoalexin (Beier and Oertli 1983) or allelochemical compound (Baskin et al. 1967). These compounds are relevant for being potential substitutes for pesticides in crop protection (Eljarrat and Barceló 2001). In wild parsnip (Pastinaca sativa, also an Apiaceae plant), the quantity of furanocoumarins allocated to floral units at different stages of development is consistent with the value of those floral units (Nitao and Zangerl 1987). Additionally, studies of field-grown plants showed that FCs storage is closely related to organs and phenological stages. Leaves, stems, roots and fruits do not have equal concentrations of FCs even if psoralen, xanthotoxin, bergapten and isopimpinellin were detected in all tissues (Milesi et al. 2001). Therefore, it is believed that FCs act, specifically in storage organs, as protection chemicals against biostress. As for the case of Baizhi entering the S-stage, the above ground parts occur yellowing, compounds redistribution. FCs are then yielded and accumulated in storage organ (root), specifically in cortex. We suggest that there may be two strategies for Baizhi to survive the stress of summer season. The first strategy is the avoidance trait, in which Baizhi will bolt early in May and adapt the summer season with seed dormancy. The second strategy is the resistance trait, the above-ground parts of Baizhi will senescence and the root will become the resting organs which contain higher dry weigh.
The results indicate that Baizhi roots should be harvested at S-stage. However, it is possible that the growth of Baizhi switch from vegetative stage to bolting stage directly, without a summer dormancy stage. Our preliminary studies indicated that sowing earlier by 1 month (in November) may result in early bolting in May. Many studies have reported that stage-transition of Baizhi is determined by, for example, sowing date, fertilizing management and other environmental factors. In the near future, global warming is expected to affect phenological events such as flowering and fruiting in plants and will hasten development time in plant species that respond to cues such as degree days (Hughes 2000). Under the threat of global warming, analyzing the stage-transition physiology of Baizhi will facilitate the modification of the cropping system to achieve a stable and uniform S-stage of Baizhi.
summer dormancy stage
high-performance liquid chromatography with diode-array detection
Abad MJ, Heras BDL, Silvan AM, Pascual R, Bermejo P, Rodriguez B, Villar AM (2001) Effects of furocoumarins from Cachrys trifida on some macrophage functions. J Pharm Pharmacol 53:1163–1168
Ban HS, Lim SS, Suzuki K, Jung SH, Lee S, Lee YS, Shin KH, Ohuchi K (2003) Inhibitory effects of furocoumarins isolated from the roots of Angelica dahuricae on prostaglandin E2 production. Planta Med 69:408–412
Baskin JM, Ludlow CJ, Harris TM, Wolf FT (1967) Psoralen, an inhibitor in the seeds of Psoralea subacaulis (Leguminosae). Phytochemistry 6:1209–1213
Beier RC, Oertli EH (1983) Psoralen and other linear furocoumarins as phytoalexins in celery. Phytochemistry 22:2595–2597
Chiou WF, Huang YL, Chen CF, Chen CC (2001) Vasorelaxing effect of coumarins from Cnidium monnieri on rabbit corpus cavernosum. Planta Med 67:282–284
Cho YH, Kim JH, Park SM, Lee BC, Pyo HB, Park HD (2006) New cosmetic agents for skin whitening from Angelica dahurica. J Cosmet Sci 57:11–21
Deng GG, Wei W, Yang XW, Zhang YB, Xu W, Gong NB, Lü Y, Wang FF (2015) New coumarins from the roots of Angelica dahurica var. formosana cv. Chuanbaizhi and their inhibition on NO production in LPS-activated RAW264.7 cells. Fitoterapia 101:194–200
Derong D, Jin LU, Xingfu C, Mingliang S, Deming XIE, Huafen LI (1999) Studies on different methods of fertilizer application to curtail earlier bolting for a better yield of taiwan angelica (Angelica dahurica var. formosasa). Chin Tradit Herbal Drugs 2:135–136
Dinis TC, Madeira VM, Almeida LM (1994) Action of phenolic derivatives (acetaminophen, salicylate, and 5-aminosalicylate) as inhibitors of membrane lipid peroxidation and as peroxyl radical scavengers. Arch Biochem Biophys 315:161–169
Eljarrat E, Barceló D (2001) Sample handling and analysis of allelochemical compounds in plants. Trends Anal Chem 20:584–590
Feng Y, Zhu L, Pan T, Guo Z, Zhong X, Ding A, Pan D (2015) Characterization of summer dormancy in Narcissus tazetta var. Chinensis and the role of NtFTs in summer dormancy and flower differentiation. Sci Hortic 183:109–117
Garcia A, Apan AN, Delgado TOR, Velázquez HP, Martínez-Vázquez M (2000) Anti-inflammatory activity of coumarins from Decatropis bicolor on TPA ear mice model. Planta Med 66:279–281
Gillespie LM, Volaire FA (2017) Are winter and summer dormancy symmetrical seasonal adaptive strategies? The case of temperate herbaceous perennials. Ann Bot 119:311–323
Hughes L (2000) Biological consequences of global warming: is the signal already apparent? Trends Ecol Evol 15:56–61
Kim YK, Kim YS, Ryu SY (2007) Antiproliferative effect of furanocoumarins from the root of Angelica dahurica on cultured human tumor cell lines. Phytother Res 21:288–290
Kwon YS, Kobayashi A, Kajiyama SI, Kawazu K, Kanzaki H, Kim CM (1997) Antimicrobial constituents of Angelica dahurica roots. Phytochemistry 44:887–889
Leopold JA, Loscalzo J (2009) Oxidative risk for atherothrombotic cardiovascular disease. Free Radical Biol Med 47:1673–1706
Li B, Zhang X, Wang J, Zhang L, Gao B, Shi S, Tu P (2014a) Simultaneous characterisation of fifty coumarins from the roots of Angelica dahurica by off-line two-dimensional high-performance liquid chromatography coupled with electrospray ionisation tandem mass spectrometry. Phytochem Anal 25:229–240
Li X, Zeng X, Sun J, Li H, Wu P, Fung KP, Liu F (2014b) Imperatorin induces Mcl-1 degradation to cooperatively trigger Bax translocation and Bak activation to suppress drug-resistant human hepatoma. Cancer Lett 348:146–155
Lü JL, Zhao J, Duan JA, Yan H, Tang YP, Zhang LB (2009) Quality evaluation of Angelica sinensis by simultaneous determination of ten compounds using LC-PDA. Chromatographia 70:455–465
Luszczki JJ, Glowniak K, Czuczwar SJ (2007) Imperatorin enhances the protective activity of conventional antiepileptic drugs against maximal electroshock-induced seizures in mice. Eur J Pharmacol 574:133–139
Marumoto S, Miyazawa M (2010) β-Secretase inhibitory effects of furanocoumarins from the root of Angelica dahurica. Phytother Res 24:510–513
Milesi S, Massot B, Gontier E, Bourgaud F, Guckert A (2001) Ruta graveolens L.: a promising species for the production of furanocoumarins. Plant Sci 161:189–199
Nitao JK, Zangerl AR (1987) Floral development and chemical defense allocation in wild parsnip (Pastinaca sativa). Ecology 68:521–529
Ofir M, Kigel J (2007) Regulation of summer dormancy by water deficit and ABA in Poa bulbosa ecotypes. Ann Bot 99:293–299
Oh H, Lee HS, Kim T, Chai KY, Chung HT, Kwon TO, Jun JY, Kim YC, Yun YG (2002) Furocoumarins from Angelica dahurica with hepatoprotective activity on tacrine-induced cytotoxicity in Hep G2 cells. Planta Med 68:463–464
Pervin M, Hasnat MD, Debnath T, Park SR, Kim DH, Lim BO (2014) Antioxidant, anti-inflammatory and antiproliferative activity of Angelica dahurica root extracts. J Food Biochem 38:281–292
Piao XL, Park IH, Baek SH, Kim HY, Park MK, Park JH (2004) Antioxidative activity of furanocoumarins isolated from Angelicae dahuricae. J Ethnopharmacol 93:243–246
Qian Y, Wang Y, Sa R, Yan H, Pan X, Yang Y, Sun Y (2013) Metabolic fingerprinting of Angelica sinensis during growth using UPLC-TOFMS and chemometrics data analysis. Chem Cent J 7:42
Ryu SY, Kou NY, Choi HS, Ryu H, Kim TS, Kim KM (2001) Cnidicin, a coumarin, from the root of Angelica koreana, inhibits the degranulation of mast cell and the NO generation in RAW 264.7 cells. Planta Med 67:172–174
Sarker SD, Nahar L (2004) Natural medicine: the genus Angelica. Curr Med Chem 11:1479–1500
Shiau YJ, Jeng TL, Kao JL, Lai JS, Huang CH (2011) Extraction of imperatorin from root slices and explants of Angelica dahurica. J Taiwan Agric Res 60:101–114
Shimada K, Fujikawa K, Yahara K, Nakamura T (1992) Antioxidative properties of xanthan on the autoxidation of soybean oil in cyclodextrin emulsion. J Agric Food Chem 40:945–948
Suleimenov EM (2009) Components of Peusedanum morisonii and their antimicrobial and cytotoxic activity. Chem Nat Compd 45:710
Volaire F (2002) Drought survival, summer dormancy and dehydrin accumulation in contrasting cultivars of Dactylis glomerata. Physiol Plant 116:42–51
Volaire F, Norton M (2006) Summer dormancy in perennial temperate grasses. Ann Bot 98:927–933
Volaire F, Seddaiu G, Ledda L, Lelievre F (2009) Water deficit and induction of summer dormancy in perennial Mediterranean grasses. Ann Bot 103:1337–1346
Wang NH, Huang LQ, Yang B, Kimie B, Masahiko T, Yuan CQ, Qin HZ, Shu P (2001) Studies on original plant of traditional Chinese drug“Bai Zhi” (Radix Angelicae dahuricae) and its closely related wild plants discussion on original plant and cultivation history of traditional chinese drug “Bai Zhi” and evolution of its closely related wild plants. China J Chin Mater Med 26:733–736
Wang C, Wang T, Huang L, Lu W, Zhang J, He H (2016) Synthesis and fluorescent study of 5-phenyl furocoumarin derivatives as vasodilatory agents. Bioorg Med Chem Lett 26:640–644
Wang GH, Chen CY, Tsai TH, Chen CK, Cheng CY, Huang YH, Hsieh MC, Chung YC (2017) Evaluation of tyrosinase inhibitory and antioxidant activities of Angelica dahurica root extracts for four different probiotic bacteria fermentations. J Biosci Bioeng 123:679–684
Xingfu C, Jin LU, Derong D (1999) Bo zhong qi dui bai zuo zao qi chou tai ying xiang de yan jiu. China J Chin Mater Med 24:211
Yousif AN, Scaman CH, Durance TD, Girard B (1999) Flavor volatiles and physical properties of vacuum-microwave-and air-dried sweet basil (Ocimum basilicum L.). J Agric Food Chem 47:4777–4781
YCC and WHL conceived the experiment, analyzed the data and drafted the manuscript. WHL, TWC performed the experiment. All authors read and approved the final manuscript.
We thank Professor Li-yu D. Liu and Chen-An Tsai for description of statistic results.
The authors declare that they have no competing interests.
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This study is a part of our project that belongs to Ministry of Science and Technology and Council of Agriculture, Executive Yuan of Taiwan. Our project has not been ended yet; therefore, data will not be shared until we complete all project works.
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Liang, WH., Chang, TW. & Charng, YC. Influence of harvest stage on the pharmacological effect of Angelica dahurica. Bot Stud 59, 14 (2018). https://doi.org/10.1186/s40529-018-0230-1
- Angelica dahurica
- Summer dormancy
- Harvest time