Research Article | Volume: 10, Issue: 1, January, 2022

Efficient plant regeneration and molecular marker-based genetic integrity analysis of Ceropegia lawii Hook: An endemic and endangered herb

Mukta R. Bhamare Hemantkumar A. Thakur Jaykumar J. Chavan   

Open Access   

Published:  Jan 07, 2022

DOI: 10.7324/JABB.2021.100112

The present study aimed to optimize the in vitro direct shoot organogenesis system for propagation, in vitro flowering, and genetic fidelity analysis of micropropagated clones of Ceropegia lawii. The efficiency of various plant growth regulator treatments was evaluated during various regeneration stages. Direct shoot organogenesis cultures were established through stem nodal buds on Murashige and Skoog (MS) medium supplemented by 6-benzylaminopurine (BAP, 0.5 mg/l). Maximum frequency of shoot induction and multiplication (98.5%) with 14 ± 0.5 shoots per explant was attained through the augmentation of BAP (2.0 mg/l) in the MS medium. In vitro-derived shoots were rooted optimum (89.62%) with 6.9 ± 0.1 numbers of roots while transferring to a half-strength MS medium supplied with indole-3-butyric acid (1.5 mg/l). A maximum number of flowers (5.6 ± 0.1) with 91.33% induction frequency were reported when microshoots were transferred to the MS medium formulated with BAP (2.0 mg/l) in combination with sucrose (175 mM). Tissue culture-derived plantlets were adapted best in a mixture of sterile soil, sand, and coco peat (1:2:1) with 88% of survival rate. Inter-simple sequence repeat analysis of regenerated plantlets revealed 99.33% genetic integrity of in vitro regenerated clones when compared with the donor plant. The findings of the present study reveals that the direct shoot organogenesis approach produces a large number of genetically stable plantlets of C. lawii which helps in its conservation and fulfills further industrial necessities.

Keyword:     Ceropegia lawii direct shoot organogenesis in vitro flowering ISSR analysis acclimatization endangered endemic medicinal plant molecular mark


Bhamare MR, Thakur HA, Chavan JJ. Efficient plant regeneration and molecular marker-based genetic integrity analysis of Ceropegia lawii Hook: An endemic and endangered herb. J Appl Biol Biotech. 2022;10(01):95–102.

Copyright: Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license.

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Ceropegia L. (family Apocynaceae), commonly known as lantern flower, is among the largest genus with over 220 species of starchy tuberous herbs and climbers [1]. These species show a wide range of variations across their habit, habitat, floral arrangement, and ecological point of view [2]. The Indian Biodiversity Catalogue has reported about 57 species, of which 35 are endemic and restricted to narrow pockets in the Western Ghats [3]. Lantern flowers are a very unique group of flowering plants from the variety, scarcity, phytogeography, and reproductive biology point of view [2]. Numerous lantern flowers have been assessed for their implications as ornamentals, secondary metabolites, and pharmacological usage. Diverse groups of secondary metabolites including tannins, phenolics, alkaloids, flavonoids, ketos, triterpenes, and saponins have been reported from numerous Ceropegia spp. [4,5]. Currently, numerous Ceropegia species are facing hurdles for their survival in nature due manmade activities including overexploitation, habitat destruction, and natural constrains like a lower rate of pollination and non-viability of seeds [5]. These activities continuously lead to a reduced number of natural populations and have enforced this plant group into the International Union for Conservation of Nature categories of flowering plants.

Ceropegia lawii Hook is an erect, perennial herb with starchy tubers naturally grown in the Western Ghats region (Fig. 1A). The genus Ceropegia (including C. lawii) has nutritional value due to the presence various sugars, starch, crude fiber, fat, and supplementary important phytochemicals; hence, many species have been routinely practiced as leafy vegetables [5]. Moreover, C. lawii is highly variable in its floral morphology and inflorescence pattern which attracts the attention of botanical enthusiasts, horticulturalists, and gardeners [2]. Currently, this species is facing several constrains such as lack of pollinators, habitat destruction, etc. C. lawii grows on flat mountains where grazing by herbivores is one of the important obstacles for its existence in the wild. Moreover, the collection of leafy vegetables and starchy tubers leads to an indiscriminate collection from the wild. Thorough field investigations have indicated the non-occurrence of C. lawii in its possible zone of existence and now it is considered as endangered taxa [6]. Hence, timely implication of biotechnological tools will support the prevention of the depleting natural population. In vitro regeneration of plantlets by culturing various organs/parts is among the feasible alternative ways for the propagation, protection, and reestablishment of the threatened lantern flowers [5]. Although there is an introductory report on the in vitro regeneration C. lawii [7], this study is limited to the development of the protocol for microtuber formation. The assessment of plant tissue culture-derived plantlets for genetic, nutritional, chemical, and other possible implications is very vital. Hence, in the present investigation, the plant regeneration method, viz. shoot multiplication, in vitro flowering, root induction, and acclimatization, has been established for C. lawii. Furthermore, the in vitro-raised clones after their establishment in soil were evaluated for genetic integrity using inter-simple sequence repeat (ISSR) markers.


2.1. Plant Source, Initiation of Cultures, and Controlled Conditions

Well-grown plants of C. lawii were brought from the Anjaneri hills near Nashik region with prior permission from forest officials. The leaves were removed and the shoot segments were soaked for 10 minutes in 5% (v/v) labolene (Qualigens, India). The shoot surface was sterilized in 0.1% HgCl2 (w/v) for 4 minutes and were cleaned (thrice) with sterilized distilled water. The single node segments were achieved by cutting the shoot segments and were inoculated in Murashige and Skoog (MS) basal salts [8] lacking phytohormone. The MS salts along with 3% sucrose, pH adjusted to 5.8, and gelling agent (Clarigel 0.2%; Himedia, India) were used as the basal medium. After inoculation, the culture vessels were transferred to the incubation room provided with 35 μmol m−2 s−1 light irradiance and 25±2°C temperature.

2.2. Production of Shoots, Flowers, and Roots under In Vitro Conditions

The nodal bud explant was used as the source for shoot initiation and proliferation in C. lawii. Stem explants having single nodes were transferred to the MS medium augmented with diverse groups of phytohormones either alone, viz. 6-benzylaminopurine (BAP) (0.5–3.0 mg/l), thidiazuron (TDZ, 0.5–3.0 mg/l), 6-furfurylaminopurine (KN, 0.5–3.0 mg/l), or in mixture with BAP (2.0 mg/l) and varied concentrations (0.5–3.0 mg/l) of kinetin, TDZ, and indole-3-butyric acid (IBA). For the induction of flowers, the apical shoots which were 2–3 cm in length from tissue culture-derived plantlets were inoculated in the MS medium added with diverse mixtures of sucrose (87–157 mM) and BAP (1.0–4.0 mg/l) as per previously described for other Ceropegia species [9,10]. Rooting of well-developed shoots was accomplished on half-strength MS medium supplemented with diverse concentrations of auxins, viz. IBA (0.5–2.5 mg/l), indole-3-acetic acid (IAA, 0.5–2.5 mg/l), and α-naphthaleneacetic acid (NAA, 0.5–2.5 mg/l). The vessels were kept in the culture room and provided with 16 hours light and 8 hours dark periods by a white florescence light (Philips, India). Readings for all the experiments were taken after 4 weeks of culture period.

2.3. Acclimatization and Field Establishment of Micropropagated Plantlets

Acclimatization of tissue culture-raised clones of C. lawii was carried out using a protocol described by Chavan et al. [10]. In vitro-derived, robust, and well-developed plantlets were taken out from culture tubes and the traces of culture medium were removed under running tap water. After Bavistin treatment (0.3% w/v for 7 minutes), the plantlets were potted in sterilized soil, sand, and coco peat in the proportion of 1:2:1. The plantlets were grown in plastic bag-covered pots, watered with quarter-strength MS basal medium devoid of carbon source, and kept in the laboratory for 4 days. The plastic bags were removed in succession and plantlets were transferred to the greenhouse for ex vitro establishment. Subsequently, the plants were implanted in the soil.

2.4. ISSR-based evaluation of in vitro-raised clones

Genomic DNA was extracted from young and healthy leaves of donor and micropropagated plants of C. lawii using the cetyltrimethylammonium bromide method [11]. The final concentration of DNA was made to 20 ng/l and stored at −20°C for further analysis. ISSR amplification was carried out using the protocol described by Zietkiewicz et al. [12]. Forty-five University of British Columbia (UBC) biotechnology laboratory primers were evaluated based on the good amplification and distinct bands. Polymerase chain reaction (PCR) conditions were maintained as per the method described by Chavan et al. [13]. Experiments were carried out using 40 ng of genomic DNA, MgCl2 (25 mM), and Taq DNA polymerase (1 U). Ten primers were selected on the basis of good amplification with respect to the reproducibility and clear bands. The PCR combination was DNA template, PCR buffer (10×), dNTPs (10 mM), Taq DNA polymerase, primer, and MgCl2. Forty amplification cycles were programmed as initial denaturation at 94°C for 6 minutes (1 cycle); denaturation at 94°C (for 1 minute); annealing at 48, 50, and 52°C (1 minute); and extension at 72°C for 2 minutes (39 cycles); and final extension at 72°C for 10 minutes (1 cycle).

2.5. Data Collection and Statistical Examination

Tissue culture experiments were conducted with a randomized block design with 20 replicates for each treatment and were carried out thrice. The data were evaluated using one-way analysis of variance and the noteworthy variations among mean values were expressed by Dunnett’s multiple comparison test Every band was scored as present (1) and absent (0), and the relationship matrix was attained using NTSYS software.

Figure 1: Direct shoot organogenesis and in vitro plant production in C. lawii. (A) Habit; (B and C) Shoot induction and proliferation; (D) In vitro rooting; and (E and G) Hardening and ex vitro establishment of plantlets.

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3.1. In Vitro Shoot Production and Rooting of Microshoots

Culturing of either cell, tissue, or organs of plants is among one of the safest biotechnological routes implicated previously for plant propagation, restoration, and production of industrially important chemical compounds in numerous lantern flower species [5]. In the present investigation, an efficient micropropagation system was developed for large-scale propagation and genetic fidelity assessment of C. lawii. The nodal bud explant excised was found suitable for rapid shoot multiplication in C. lawii. The efficiency of the various phytohormones on shoot initiation and subsequent proliferation is presented in Table 1. Individual and combined supplementation of plant growth regulator (PGR) significantly altered the shoot induction and proliferation rate; however, the MS medium lacking PGR did not show any response. Individually, BAP (2.0 mg/l) was found to be the most efficient for shoot induction (98.5 %), best number of shoots (14.5 ± 0.2), and maximum shoot length (10.5 ± 0.6) (Table 1, Fig. 1B and C). Similarly, improved shoot bud proliferation and production of multiple numbers of shoots in the presence of BAP have been reported previously in other Ceropegia species, including C. attenuata [9], C. bulbosa [14], C. juncea [15], and C. mahabalei [16]. Moreover, the optimum response to direct adventitious shoot bud induction in C. bulbosa from thin cell layer cultures was also observed on the BAP-incorporated MS medium [17]. The rate of shoot production was comparatively lower when MS medium was fortified with individual concentrations of KN and TDZ when compared to BAP. A maximum of 7.5 ± 0.2 and 8.0 ± 0.1 shoots were produced when the nodal explant was grown on KN (2.0 mg/l) and TDZ (2.5 mg/l) respectively. However, a mixture of BAP (2.0 mg/l) with either KN (1.5 mg/l) or TDZ (2.5 mg /l) resulted in the production of 11.0 ± 0.4 and 8.8 ± 0.6 shoots, respectively. A synergistic effect of two cytokinins was superior for shoot multiplication in Lagenaria siceraria [18] and Chlorophytum borivilianum [19]. The shoot proliferation rate and its number was increased when the shoots were transferred for sequential subcultures on fresh media of known compositions.

Successful attainment of the in vitro plant regeneration approach confides on root induction and growth of regenerated shoots under controlled conditions [20]. Well-developed in vitro roots empower the plantlets to establish in the soil and promote self-perpetuation under ex vitro conditions. Microshoots of C. lawii were rooted when transferred to half-strength MS medium added with varied different concentrations (0.5–2.5 mg/l) of auxins (IAA, NAA, and IBA). The response of auxins during in vitro root production in C. lawii is presented in Table 2. Among the auxins tested, IBA proved to be superior when compared to IAA and NAA. Moreover, the roots produced in the IBA-supplemented medium were thicker, having an added advantage during the acclimatization process. A similar observation was made previously in Ceropegia noorjahaniae [21]. The highest root induction frequency (89.62%) and optimal root number (6.9 ± 0.1) were attained using IBA at 1.5 mg/l (Table 2, Fig. 1D). The practicality of IBA during in vitro root induction has been noted previously for Ceropegia panchganiensis [10] and Mentha arvensis [22]. In vitro grown plantlets with three to four pairs of healthy leaves and well-grown roots were transferred to plastic pots having a sterilized planting substrate (soil, sand, and coco peat in the 1:2:1 ratio). A similar composition was found to be most suitable for hardening of micropropagated plantlets of C. panchganiensis [10], Ceropegia evansii [13], and Ceropegia santapaui [23]. In this study, the plantlets were transferred to a greenhouse for further hardening and acclimatization to field conditions after 1 week’s exposure to controlled laboratory conditions. Subsequently, the plantlets were moved to soil where 88% survival rate was recorded. Regenerants showed homogeneity lacking any morphological differences (Fig. 1E–G).

Table 1: Effect of different plant growth regulators on axillary bud breaking from nodal explant of Ceropegia lawii.

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3.2. In Vitro Flowering

Due to the fluctuations in environmental factors during ex vitro growth, the flower induction process in most of the flowering plants has been hampered, which has led to the depletion of the natural population. In vitro flower induction under controlled laboratory conditions is among the potential alternatives to study the flower induction mechanism [9,10]. In this study, diverse BAP concentrations and sucrose significantly altered the frequency of in vitro induction flower buds in C. lawii (Fig. 2). Apical shoots (with three to four pairs of leaves) were inoculated in the MS medium fortified with 2.0 mg/l of BAP and 175 mM of sucrose, resulting in the induction of 5.6 ± 0.1 flower buds in 91.33% cultures (Fig. 3 A & B). The results of present investigation were found be superior over previously published reports on C. lawii [24].

Table 2: Effect of auxins on in vitro rooting of regenerated shoots of C. lawii on half strength MS medium.

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Figure 2: Efficiency of BAP and sucrose on flower induction in C. lawii.

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3.3. Genetic Fidelity

The production of true-to-type plants is the ultimate aim of most of in vitro plant regeneration systems, hence the assessment of clonal fidelity among mother plants and regenerants using molecular markers among major prerequisites in any in vitro plant regeneration process. Initially, 45 ISSR primers were screened; among them the 10 most-suited primers were identified on the basis of notable and reproducible bands in C. lawii. It resulted in the production of 41 distinct visible bands in the size of 250 bp (UBC-812) to 8,000 bp (UBC-815) among the 10 ISSR primers. The number of scorable bands ranged from 2 (UBC-807 and UBC-814) to 7 bands per primer (UBC-812). A total of 448 bands were produced by 10 ISSR primers in a donor and 10 randomly selected micropropagated clones of C. lawii (Table 3). The results of ISSR fingerprints revealed 99.33% genetic similarity among mother and micropropagated plants (Table 3, Fig. 4A and B). These findings are in agreement with published reports where ISSR proved genetic reliability in micropropagated plantlets of Ceropegia species [10,13,23].

Table 3: Details of ISSR primers and amplified fragments generated in C. lawii.

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Figure 3: (A and B) In vitro flowering in C. lawi i.

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Figure 4: ISSR fingerprints of mother and micropropagated plants of C. lawii. (A) UBC-12 and (B) UBC-815.

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In conclusion, high throughput direct shoot organogenesis approach has been developed from nodal bud explants of C. lawii—a category and concentration of phytohormones significantly affected during different in vitro regeneration steps. The high degree of similarity in ISSR fingerprint meant a high degree of resemblance to their donor plant. Therefore, the high percentage of regeneration and admired genetic stability are reliable causes advising that the method can be used for large-scale propagation, conservation, and benefit in breeding programs.


All authors made substantial contributions to the conception and design, acquisition of data, or analysis and interpretation of data; they took part in drafting the article or revising it critically for important intellectual content; agreed to submit to the current journal; gave final approval for the version to be published; and agreed to be accountable for all aspects of the work. All the authors are eligible to be an author as per the International Committee of Medical Journal Editors requirements/guidelines.


There is no funding to report.


The authors report no financial or any other conflicts of interest in this work.


This study did not involve experiments on animals or human subjects.


This journal remains neutral with regard to jurisdictional claims in published institutional affiliation.


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