Agriculture, Forestry and Fisheries
Volume 4, Issue 4, August 2015, Pages: 173-178

Plantlet Regeneration of Somatic embryos from Leaf Explants of Mentha arvensis(L.) A medicinally important Plant

Sammaiah D.1, Odelu G.2, Venkateshwarlu M.3, Srilatha T.4, Anitha Devi U.5,Ugandhar T.6

1Department of Botany, Govt. Degree College, Huzarabad, (T.S)

2Department of Botany, Govt. Degree College, Jammikunta, (T.S)

3Department of Botany, Kakatiya University, Warangal, (T.S)

4Department of Botany, Govt. Degree & PG College for Women, Warangal, (T.S)

5Department of Botany, Govt. Degree & PG College for Women, Karimnagar, (T.S)

6Department of Botany, SRR Govt. Degree & P.G College, Karimnagar, (T.S)

Email address:

(Ugandhar T.)

To cite this article:

Sammaiah D., Odelu G., Venkateshwarlu M., Srilatha T., Anitha Devi U., Ugandhar T.. Plantlet Regeneration of Somatic embryos from Leaf Explants of Mentha arvensis(L.) A medicinally important Plant. Agriculture, Forestry and Fisheries. Vol. 4, No. 4, 2015, pp. 173-178. doi: 10.11648/j.aff.20150404.14

Abstract: The present study was conducted with the aim of evaluating some of the factors that influence induction and plantlet regeneration of somatic embryos in Mentha arvensis ( L) var piperascens Holmes (menthol or Japanese mint)since there are no available reports on Somatic embryogenesis and regeneration of plantlet in this medicinally important plant  species. Leaves from plants growing under temporary shed were cultured on Murashige and Skoog medium fortified with (0.5-5.0mg/L) Napthlene acetic acid (NAA)+(0.5 mg/L)Thidizuron(TDZ). High frequency of somatic embryo formation was found at (2.5mg/L) NAA+ (0.5mg/L) TDZ in leaf explants respectively, Secondary somatic embryogenesis was also observed when primary somatic embryos were sub cultured same somatic embryo induction medium well developed cotyledonary stage embryos were germinated on MS medium supplemented with (0.5mg/L) (NAA) + (0.5-5.0mg/L)TDZ maximum 80% of somatic embryos germination and plant let formation was found at (2.5 mg/L) NAA+ (0.5 mg/L) (TDZ). The post translation survival rate of plants was 80% plants and flowers formation were morphological similar to the mother plants.

Keywords: Leaf Explants NAA (Napthlene Acetic Acid), TDZ (Thidizuron), Mentha arvensis (L), Somatic Embryos and Regeneration

1. Introduction

Mentha ravensis (Linn). var piperascens Holmes (menthol or Japanese mint) is an industrial crop that is widely cultivated for its essential oil from which menthol is crystallized. The essential oil, menthol and terpenes of the dementholated oil of M. arvensis are variously used in the food, perfumery and pharmaceutical industries. Improvement in the pest and disease tolerance and other adaptive characters determining the yield and quality of essential oil will make mint cultivation more economical. Construction of the desired M. arvensis genotypes will require transfer of specific foreign genes into the crop. Efficient procedures are required to regenerate plants from the transformed cells and for rapid micro-propagation of plant(s) of selected genotype(s). In vitro high efficiency procedures for cell and callus cultures and shoot regeneration from axillary buds and leaf explants have been reported in some species of the genus Mentha, especially the commercially important species M. piperita and M. spicata (Lin and Staba 1961; Cellarova 1992).

Total production of Mentha matches more than 32,000 MT per year and India is considered one of the largest producer and exporter with 27% commodity market share. Corn Mint is valued as multimillion cash crops for its multipurpose uses in the field of pharmaceuticals cosmetics as well as flavouring of food and beverages, oral preparations, such as toothpastes, dental creams and mouth washes. Green leaves of plants are used formaking chutney and for flavouring culinary preparation vinegar, flavour liqueurs, breads, salads, soups, cheese jellies, spice mixtures for many processed foods as well as in herbal tea (Moreno et al., 2002; Kofidiset al., 2006; Yadegarinia et al., 2006).

Mint plant is used as insect repellent, anaesthetic, galactofuge, refrigerant, stimulant, stomachic and excellent gastric organic stimulant (Budavari et al., 1989; Gulluceet al., 2007). Many authors worked on in vitro production of Mentha species using different explants viz., nodes, internodes, axillary buds and leaf discs. (Karasawa and Shimizu 1980, Rech and Pires, 1986, Van Eck and Kitto, 1990, Kukreja et al., 1992, Sato et al., 1993, Caissard et al., 1996, Reed, 1999). Preliminary work on in vitro regeneration of M. arvensis was carried out by several investigators but the results exhibited low efficiency of shoot regeneration from nodal explants.

Somatic embryo genesis offers great potential in plant multiplication and crop improvement for efficient cloning and genetic transformation (Ammiratio 1987, Roberts, 1995). It is an alternative and efficient method for plant propagation over regeneration via organogenesis. Somatic embryos are believed to originate from single cell while organogenesis is through collective organization of cell. Therefore the plants derived from somatic embryos tend to be genetically alike; in addition somatic embryos are bipolar structures with root and shoot apices that can easily be developed into complete plantlets.

Embryos formed in cultures have been variously regenerated as accessory embryos, adventive embryos, embryoids and supernumerary embryos. Kohlenbach (1978) has proposed the following classification of embryos.

1.   Zygotic embryos- those formed by fertilized egg or the zygote.

2.   Non- Zygotic embryos- those formed by cells other than the zygote.

               i.        Somatic embryos- those formed by the sporophytic cells (except zygote) either in vitro or in vivo. Such somatic embryos arising directly from other embryos or organs (stem embryos in carrot and butter cup) are termed adventive embryos.

             ii.        Parthenogenetic embryos – those formed by unfertilized egg.

            iii.        Andorogenic embryos-those formed by the male gametophyte (microspore pollen grains).

In Somatic embryogenesis the embryo regenerate from somatic cells, tissues or organs either de novo or directly from tissues (Adventive origin) which in the opposite of zygotic or sexual embryogenesis. Various terms for non-zygotic embryos have been reported in literature such as adventive embryo (somatic embryos arising directly from other organs or embryos) parthenogenetic embryos (those formed by the unfertilized egg) and androgenetic embryos (formed by the male gametophyte). However in general context somatic embryos are those which are formed from the somatic tissue in culture, i.e. In vitro conditions. In sexual embryogenes is the act of fertilization triggers the egg cell to develop into an embryo, however it is not the monopoly of the egg to form an embryo. Any cell of the gametophytic (embryo-sac) or sporophytic tissue around the embryo-sac may give rise to an embryo, cells of the nucellus or linear integument may develop into embryos in the members of Rutaceae family. There are examples of embryos arising from endospermal cells also. However, the rate of multiplication is very low. In the present communication, we report reproducible method for in vitro plant regeneration via somatic embryogenesis in M. arvensis var piperascens Holmes (menthol or Japanese mint) from leaf explants using various cytokinins especially TDZ.

2. Methodology

2.1. Plant Material

Seeds of M. arvensis var piperascens Holmes (menthol or Japanese mint) were collected. From CIMAP (Central Institute of Medicinal Aromatic Plant Uppal. Hyderabad). Seeds which were initially soaked overnight and then washed with running tap water for 30 min to remove adherent particles, thoroughly washed seeds were then immersed in 5% (v/v) Teepol for 10 min and then rinsed 3 times with sterile double distilled water. This was followed by the surface sterilization with 05 % (m/v) HgCl2under the sterile conditions for 5 min. these were rinsed 5 times in sterile double distilled water to remove all traces of HgCl2 the sterilized seeds were then placed on to the basal Murashige and Skoog (1962) medium for germination.

2.2. Culture Media and Culture Conditions

Leaf (6 weeks old ) explants from axenic seedlings were placed on MS medium supplemented with 30 gm/L sucrose along with different combinations of NAA (0.5 – 5.0 mg/L ) + 0.5 mg/L TDZ respectively. The pH of medium was adjusted to 5.8 prior to autoclaving 121o C for 15 -20 min. All the cultures were incubated under 16/8 h light / dark photo period at 25±2o C. a light intensity of 40 µ mol m-2s-1 was provided by cool- white fluorescent tubes. The cultures were transferred to fresh medium after an interval of 4 weeks.

For germination and plantlet formation somatic embryos were transferred to MS medium supplemented with (0.5 mg/L) NAA + (0.5–5.0 mg/L) TDZand incubated under the same culture conditions.

3. Results

Results on somatic embryogenesis in M. arvensis are presented in (Table-1) leaf cultured on various concentrations of NAA (0.5-5.0 mg/L) in combination with (0.5mg/L) TDZ become swollen and generally dedifferentiated and developed friable callus after 8-10 days of culture. Maximum number of somatic embryos / explant and higher percentage of response for somatic embryos formation have been found at (2.5 mg/L) NAA + (0.5 mg/L) TDZ in leaf explants of M.arvensis (Fig –I) with the increase of NAA concentration up to 5.0 mg/L with (0.5 mg/L) TDZ within 25-30 days of culture, globular, cotyledonary, and heart shaped embryos have formed directly on the surface of callus. But when the concentration of NAA was increased above (3.0 mg/L), percentage of response and somatic embryo induction were found decreased at higher concentration of NAA (5.0 mg/L) in combination with (0.5 mg/L) TDZ. When the explants of primary somatic embryos were cut into fragments and cultured on the same induction medium secondary somatic embryos were induced within two weeks.

Table 1. Effect of various concentrations of NAA and (0.5 mg/L) TDZ onSomatic embryo genesis from leaf explants of M.arvensis.

Hormone conc (mg/L) % of cultures responding % of Standard Error formation Average no of Standard Error /explants (S.E.)*
0.5+0.5 73 31 6.7 ± 0.3
1.0+0.5 80 50 6.9 ± 0.5
1.5+0.5 90 60 10.7 ± 0.3
2.0+0.5 92 76 12.0 ± 0.54
2.5+0.5 94 80 15.0 ± 0.5
3.0+0.5 85 70 13.0 ± 0.6
3.5+0.5 75 65 11.0 ± 0.4
4.0+0.5 70 60 9.0 ± 0.5
4.5+0.5 65 58 7.0 ± 0.4
5.0+0.5 60 50 5.0 ± 0.5

*S.E. Standard Error

Table 2. Effect of NAA + TDZ on the conversion of somatic embryoids into plantlets in M.arvensis.

Hormone conc (mg/L) % of cultures responding Average no of shoots/embryods (S.E.)*
0.5+0.5 52 2.6 ± 0.63
0.5+1.0 56 3.0 ± 0.44
0.5+1.5 58 3.2 ± 0.45
0.5+2.0 60 3.8 ± 0.43
0.5+2.5 65 4.0 ± 0.32
0.5+3.0 70 6.0 ± 0.34
0.5+3.5 52 3.6 ± 0.34
0.5+4.0 54 2.5 ± 0.45
0.5+4.5 50 2.0 ± 0.43
0.5+5.0 40 1.5 ± 0.23

*S.E. Standard Error

Fig. 1. Somatic embryogenesis and plant regeneration in Leaf explants cultures of M.arvensis L. a) Embryogenic callus induction b) Maturation of Somatic embryos c) germination of somatic embryos, d) plant with normal shoot and root system developed from somatic embryos E) regenerated plantlets growing in Pot

Thus proliferation of somatic embryos occurred in two ways:

1.   Multiplications of somatic embryos from the explants through primary somatic embryogenesis and

2.    Proliferation of secondary somatic embryos from already formed

3.1. Germination of Somatic Embryos

For germination, globular, heart and torpedo shaped embryos (a mixture) were transferred to MS medium supplemented with different concentration of auxin such as NAA (0.5mg/L) in combination with TDZ(0.5-5.0mg/L).Highest (70%) frequency of embryo germination was noticed on a medium containing (0.5mg/L) NAA in combination with (3.0mg/L) TDZ. TDZand NAA were better for germination of somatic embryos in M.arvensis. When the concentration of BAP was increased above (3.0 mg/L), percentage of response and somatic embryo germination frequencies were decreased it was found that at higher concentration of TDZ (5.0 mg/L) in combination with (0.5 mg/L) NAA. Maximum number of somatic embryos germination and higher percentage of response for somatic embryos germination have been found at (3.0 mg/L) TDZ + (0.5 mg/L) NAA in leaf explants derived somatic embryogenesis of M.arvensis (Table -2) (Fig-1-A,B and C).

3.2. In Vitro Rooting

Fully elongated healthy shoots were transferred on MS medium fortified with different concentration of IAA (0.1mg/L) or IBA (1.5 mg/L).Profuse rhizogenesis was observed on MS medium produced roots (Fig-D).

3.3. Acclimatization

Rooted plantlets were removed from the culture medium and the roots were washed under running tap water to remove agar. Then the plantlets were transferred to polypots containing pre- soaked vermiculite and maintained inside a growth chamber set at 28oC and 70 – 80 % relative humidity. After three weeks they were transplanted to poly bags containing mixture of soil + sand + manure in 1: 1: 1 ratio and kept under shade house for a period of three weeks. The potted plantlets were irrigated with Hogland’s solution every 3 days for a period of 3 weeks (Fig-E).

4. Discussion

Somatic embryogenesis is an important step in any successful plant transformation scheme. Stable transformation required that a single cell gives rise to a plant. The ideal transformation scheme is that via somatic embryogenesis, because from callus each transformed cell has the potential to produce a plant. Somatic embryogenesis and subsequent plant regeneration has been reported in most of the major crop species (Evans and Sharp, 1981). Soybean and cotton proved to be the most difficult to regenerate.

In the present investigation, the results on somatic embryogenesis have shown that auxin such as NAA (0.5-5.0mg/L0 along with cytokininTDZ are essential for inducing the somatic embryogenesis from leaf explants of M.arvensis.A major factor for somatic embryogenesis is the nature of growth regulators used in the induction medium. The type of auxin or auxin in combination with cytokinin used in the medium can greatly influence somatic embryo frequency. The requirement of cytokinin in addition to auxin was observed in Sapindus trifoliatus (Desai, 1986), Termineliaarjuna (Kumari, 1998) and Psoralea corylifolia (Sahrawat and Chand, 2001) as it was observed in the present studies. Somatic embryo genesis was induced on medium containing NAA alone in Solanum melogena (Matsuoka and Hinata, 1979; Gladdle, 1983; Sharma and Rajam, 1995).

Matsuokaand Hinata(1979) and Gleddle, (1983) also observed a stimulatory effect of NAA on embryogenesis in eggplant hypocotyls explants as well as in leaf explants with carrot hypocotyls explant where somatic embryos were formed in response to a wide range of auxins including (IAA: NAA, 2,4-D, 2,4,5-T).

The embryogenesis action of NAA in egg plants were also different in another aspect where the role of auxin in embryogenesis species other than eggplant, induction and maturation of somatic embryos to the cotyledon stage was achieved on the same medium. The removal of NAA was required only for further development of embryos to plant lets and cotyledon explants grown on NAA exhibited globular shaped heart shaped and torpedo shaped stages. The embryogenic potential was markedly dependent on genotype isolated embryogenic callus from M.arvensis.

The sugars which supported callus proliferation on cotyledon explant i.e. sucrose, fructose, and glucose also supported embryogenesis, Somatic embryogenesis in NAA treated leaf explants was inhibited by cytokinins. Matsuoka and Hinate (1979) also observed cytokinin-induced embryogenesis in eggplant hypocotyls cultures. Ethylene also typically inhibited somatic embryogenesis (Ammirato 1983). The molecular aspects of embryogenesis, embryo specific proteins in carrot have been studied in rice (Chen and Luthe, 1987).Embryo specific proteins in somatic embryogenesis has been studied in alfaalfa (Stuat, 1985). These developmental regulated genes are now being isolated from many plants (Choi, 1987). BAP has been used for shoot induction of melon (Kathal, 1986; Suesmatsu, 1986; Dirks and Buggenum, 1989). The effect of BAP on somatic embryogenesis was tested by Oridate and Oosawa (1986) and the most efficient embryo formation was obtained at a concentration of (0.1 mg/L). The adventitious shoot formation and somatic embryogenesis in melon can be controlled by the ratio of auxins and cytokinin in the medium. In Coffea arabica somatic embryos also developed only when callus grown on 2,4 –D containing medium was transferred to 2,4-D free medium (Sondal and Sharp, 1977) and in pumpkin, NAA and IBA favored embryogenesis (Jelaska, 1974). In nucellus cultures of Vitis embryo formation occurred in the presence of NAA and BAP (Molling and Srinivasan, 1976).

The high frequency of multiple shoots was recorded from direct organogenesis of nodal explant. MS medium supplemented with benzyl adenine (4.4μM), kinetin (4.6μM), and 3% sucrose promoted the maximum number of shoots as well as beneficial shoot length in Paederia foetida (L.) (Thirupathi, 2013)

Somatic embryogenesis is also preferred because it allows production of plant without somaclonal variation and in efficient cloning and genetic transformation (Sharp, 1980). Synthetic seeds can also be developed by encapsulating somatic embryos in sodium alginate complex with calcium chloride as it was developed in Solanum melogena (Lakshmana Rao and Singh, 1991). Whereas Binzel, (1996) reported that the entire process of induction and maturation of the embryos was completed on the same MS medium containing auxins and cytokinins (NAA+ TDZ) in M arvensis it was observed the requirement of both the hormones in the present investigations. Similarly somatic embryos maturation on MS medium containing the combination of auxins (NAA) and cytokinins (BAP) was observed in Cajanus cajan (Mallikarjuna, 1996), Prunu saxivum (Garin, 1997) and Hardiewickia binate (Chand and Singh 2001). Solanum surattensce (Ugandhar.2002). NAA and cytokinin (TDZ) was observed in Mentha piperita (Saha,2010)

Thus somatic embryogenesis always appeared to be dependent on the types of auxin/cytokinin/auxin+cytokinin and their concentration in the medium. The type of phytohormone and its concentration also varies from genotype to genotype. High concentration of auxin in combination with less concentration of cytokinin induced the somatic embryogenesis and maturation of somatic embryos in M.arvensis. But in the present study, a highest germination rate 70% was achieved. Plant lets with well developed shoot and root systems were washed carefully with tap water and transferred to plastic cups containing a mixture of vermiculite and soil for hardening. The acclimatized plantlets were successfully transplanted to pots under field conditions. Regenerated plants showed no observable morphological alteration.

During the present investigations, it was found that the high concentration of auxin in combination with less concentration if cytokinin induced the somatic embryogenesis and maturation of somatic embryos in M.arvensis. In conclusion, for induction of in vitro somatic embryo genesis the type of primary explant, choice of genotypes and hormonal concentration plays on important role (Patel, (1994).


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