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The Effect of Different Concentrations of Growth Regulators and the Type of Explants on Embryogenesis and Rooting of German Chamomile (Matricaria chamomilla L).

Chamomile (Matricaria chamomilla L.) is one of the nine important medicinal plants in the world known by man (Salamon., 1992; Witchl., 1994). Research has shown that different parts of this plant flower (disc florets and ray florets), shoots and roots have certain chemical compounds (Pekic, Zekovic, Petrovic et al. 1999, Karami 2006, Szoke, Maday, Tyithak et al. 2004, Repcak, pastirova, Imrich et al. 2001). Today, this plant is used in Pharmaceutical, Cosmetics, Healthcare, Perfumery industries and also flavorings and preparing drinks (Omid Beygi 2006; Afzali, Shariatmadari, Abbasi et al. 2007; Della logia, Tubaro, Dri et al. 1986; Makay and Blumberg., 2006; Viola, Wasowski, Levi et al. 1995; Mehrin 2004, Samsamshariat 2007; Zaman 1997; Gardiner; 1999; Jaymand and Rezaei., 2002; Jaymand, Rezaei, Asgari et al. 2003). Reichling, Bisson and Becker (1984) have optimized Callus culture from sterilized stem segments of BK2 variety chamomile in MS medium containing 27.7 [micro]M NAA and 11.9 [micro]M Kinetin levels. Passamonti, Piccioni, Standardi et al (1998) reported callus culture and micropropagation in seeds of five chamomile varieties cultured on MS containing 0.05 [micro]M NAA and 11.6 [micro]M Kinetin levels. Sato, Lima, Affonso et al (2006) reported micropropagation of chamomile using shock treatment model with different growth regulators. Kintzios & Michaelakis (1999) investigated callus induction and somatic embryogenesis of flower end tissue explants in MS medium containing 26.8 [micro]M NAA and 11.5 [micro]M Kinetin levels. Moreover, the authors suggested that favorable results be obtained in studies of somatic embryogenesis of chamomile flower when the explants under study is the end tissue of the flower and all stages of tissue culture are performed in a 24-hour cycle of 16 hours of darkness and 8 hours of light. Gene transfer methods in plants for genetic modification of them is fully depended on the development of efficient methods for regeneration of alive and green stems from cultured tissues (Salmanian and Kahrizi., 2007). Without regeneration of plant, the process of producing transgenic plants in order to insert new genes, propagation of plant species and other tissue-culture related activities will not be efficient. (Abe and Futsuhara., 1989; Brisibe, Miyake, Taniguchi et al. 1992; Gholizadeh., 2005) The effect of different concentrations of growth regulators and the type of explants on embryogenesis and rooting of German chamomile (Matricaria spp) have been studied.

MATERIALS AND METHODS

Plant material and disinfection

The experiments were performed in Saravan University, Iran in 2014. The Coral genotype (2n=4x=32) was used in this study. Before the flowering stage, when the plants are 1015 cm height, young plants with stronger structure were selected and transferred to the laboratory for the experiments. MS Medium Culture (Murashige Skoog., 1986) was a basal medium in these experiments. The culture media were added with 30 g of sucrose per liter and the required regulators were added to it according to the type of experiment and PH was set on 5.8 with the help of caustic soda and HCl 1N. Finally, to make the solid culture medium, 8 grams of agar was added to a liter of culture medium and autoclaved for 20 minutes in order to disinfect it at atmospheric pressure and a temperature of 125 [degrees]C. After autoclave, it was distributed into 9 cm Sterile Petri Dishes so that 25 mL culture medium was put into each Petri Dish. Explants disinfection for testing was so that plants were placed under running water for primary disinfection for 30 minutes after primary washing with tap water. The final disinfection under Laminar Air Flow Hood was conducted by ethanol 70 percent for 60 seconds. Then they were placed in a solution of sodium hypochlorite 1percent for 10 minutes. After these stages, they were rinsed with sterilized distilled water four times and each time for 5 minutes. Finally, explants at levels: stem, Axillary buds, and leaves were cut with a sterile razor/scalpel as long as 0.5 cm and incubated on the culture media. The required tools were sterilized with distilled water and ethanol 96 percent and wrapped in an aluminum foil and placed in the oven at 200 [degrees]C for 2 hours for disinfection.

Embryogenesis and rooting tests of chamomile

With the aim of establishing sterilized explants in vitro, in order to callus production and evaluation of embryogenesis, 32 Hormonal Treatments were used in two separate tests with different concentrations and types. The experimental design used for both experiments was implemented as Factorial Experiments in Randomized Complete Block Design (RCBD) format with three replications. In testing the effect of NAA and Kinetin on the embryogenesis, factors included: (NAA) at four levels: (0, 0.5, 1, 2 mg/l, Kinetin at four levels: (0, 0.5, 1, 2 mg/l), explants at four levels: (Stem, Axillary bud and leaves). In investigating the effect of NAA and Kinetin on rooting, factors were NAA at four levels: (0, 0.5, 1, 2 mg/l) and Kinetin at four levels: (0, 0.5, 1, 2 mg/l).

RESULTS

The effect of different concentrations of growth regulators NAA and Kinetin on embryogenesis of chamomile (Matricaria chamomilla L.) explants:

After moving explants (Stem, Axillary buds, and leaves) to the culture medium containing different levels of growth regulators NAA and Kinetin to produce callus and evaluate embryogenesis and rooting percentage, the traits were noted and Means were compared using Duncan's Multiple Range Test at the 5 percent level.

Embryogenesis and Rooting Percentage

In the table for analysis of data variance for the Embryogenesis Percentage of calluses, it was observed that the effect of different concentrations of growth regulators (NAA) and Kinetin was significant on embryogenesis of calli obtained from different explants (Table 1). It was observed that leaf explants in media containing 1 mg/l (NAA) and 1 mg/l Kinetin have produced the most Embryogenesis Percentage with the mean of 95.93 percent while the most embryogenic calli in stem explants are provided by the medium containing 1 mg/l NAA and 0.5 mg/l Kinetin with a mean of 83.78 percent and in Axillary bud explants using the medium containing 1 mg/l NAA and 1 mg/l Kinetin with a mean of 87.63 percent (Figures 1).

Moreover, in this experiment, it was observed that most calli have rooted at the same primary culture medium, so they have been investigated in terms of rooting traits percentage too and the variance analysis results of this trait are shown in Table 1. According to this table, Level 1 mg of NAA and control level (0) of Kinetin have the highest rooting rate with the average of 60.07 percent (Figure 2).

The effect of different concentrations of growth regulators NAA herbicide and Kinetin on embryogenesis of explants obtained from the vegetative parts of chamomile: Analysis of variance and comparison of averages of these traits are shown in Tables 2 &3.

Analysis of data variance for the embryogenic callus percentage showed that growth regulators NAA and Kinetin had significant impact on embryogenesis of calli (Table 2). So that the highest percentage of embryogenesis was achieved for NAA at level of 1mg/l with the Mean of 45.02 percent. Besides, in different levels of Kinetin, the highest percentage of embryogenic calli with the mean of 46.97 percent belongs to level of 1mg/l. Similar to previous experiment; it was observed that most calli produced roots at the same primary culture medium. Analysis of variance results for this trait is also listed in Table 2. It is observed that the studied factors did not impact on this trait significantly, so the data of this trait were not analyzed. In rooting with growth regulator NAA after 14 days of culture, Axillary bud explants with 1mg/l NAA were thickened and produced thick root-like organs. It was observed in experiments that each of explants: (stem, Axiliary buds and leaves) in various hormonal compounds induce the highest rate of embryogenic calli. So that the leaf explants in culture medium containing treatment A1: (NAA:1 + Kin: 1mg/l) (equally NAA to kinetin ratio), and stem explants in culture medium containing the treatment A2: (NAA:1 + Kin: 0.5 mg/l) (NAA/Kinetin ratio: 2) and axiliary bud explants in culture medium containing hormonal composition A3: (NAA:1 +Kin: 1mg/l) (equally NAA to kinetin ratio) produced the highest embryogenic calli. In terms of rooting, the medium containing the treatment A4: (NAA: 0.5 + Kin :0 mg/l) created the highest rooting.

DISCUSSION

Callus production of explants at levels: stem, Axillary bud and leaf of Chamomile in modified Murashige and Skoog (MS) culture medium has also been reported by other researchers (Reichling, Bisson and Becker., 1984; Reichling and Becker., 1976; Passamonti, Piccioni, Standardi et al. 1998). According to the reports, it is found that NAA and Cytokinin Kinetin are efficacious hormones in callogenesis of explants taken from the vegetative parts of Chamomile and these results correspond to our research. According to importance of embryogenic calli for the regeneration and studies of somaclonal variation and use in suspension cultures, this trait has also been investigated. In these experiments, it was found that the highest rate of embryogenesis is obtained in the presence of high concentrations of NAA and low concentration of Cytokinin Kinetin. Similar results have been reported by Kintzios and Michaelakis (1999). They could perform a successful somatic embryogenesis using NAA/ kinetin approximate ratio: 2, (NAA :26.8 :Kin [micro]M +Kin:11.5 [micro]M). The presence of NNA for rooting in other medicinal plants is also approved. Tavares, Pimento and Goncalves (1999) reported that NNa is necessary for rooting of Axiliary bud explants from Mellisa officinalis. Leaf explants far ahead of stem and bud explants began callogenesis which is probably related to the effect of explants source. Although, high proportion of Cytokinin typically promotes rooting (Skoog and Miller., 1957) but it is observed that high proportion of Auxin to Cytokinin induces shoot regeneration in some varieties. Considering the importance of the role of genetic control of responding to Invitro Culture in Plant Breed projects established based on tissue culture, it is recommended to use Goral genotype that is one of the most important cultivars of Chamomile as parent in crosses. Moreover, genetic studies have been conducted for identifying how to inherit genes responsible for callogenesis and regeneration and transfer them to corresponding gens if required.

http://dx.doi.org/10.22207/JPAM.12.3.30

(Received: 20 May 2018; accepted: 16 July 2018)

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Mohammad Adibian

Higher Educational Complex of Saravan, Saravan, Iran.

* To whom all correspondence should be addressed. E-mail: madibiansabzevar@Gmail.com

Caption: Fig. 1. The effect of Different Concentrations of Growth Regulators (NAA) and Kinetin on Embryogenesis Percentage of Calli Obtained from Explants of Vegetative Parts of the Chamomile

Caption: Fig. 2. The Effect of Different Concentrations of Growth Regulators (NAA) and Kinetin on the Rooting Percentage of Calli in Chamomile
Table 1. Analysis of variance was conducted on the evaluated traits
to study embryogenesis in different explants of chamomile at different
levels of growth regulators (NAA) and kinetin

Rooting       Embryogenesis   Degree of   Sources of
percentage    percentage      freedom     variation

649.14        81.98 *         2           Replication
431.36        2133.91 ***     3           NAA
8401.05 ***   5397.64 ***     3           Kinetin
1927.78 *     936.11 *        2           Explant
1571.52 **    1112.22 ***     9           NAA x Kinetin
1194.11       522.12          6           NAA x Explant
849.69        372.61          6           Kinetin x Explant
269.89        972.65 ***      18          NAAxKinetinxExplant
568.92        258.31          94          Experimental Error

*, **And ***, indicate significant differences in the level
of 5 percent, one percent and 0.1 percent.

Table 2. Analysis of variance for traits assessed in
embryogenesis study of different explants of chamomile at
different levels of growth regulators 2, 4-D herbicide and
Kinetin

Sources of                 Degree of   Embryogenesis   Rooting
Variation                  freedom     percentage      percentage

Replication                2           6435.15 ***     101.99
NAA                        3           6500.01 ***     55.89
Kinetin                    3           4349.12 **      22.94
Explants                   2           1626.13         16.03
NAA x Kinetin              9           657.11          45.06
NAA x Explants             6           1324.20         54.13
Kinetin x Explants         6           1467.10         46.99
NAA x Kinetin x Explants   18          983.03          42.92
Experimental Error         94          774.11          46.02

*, **And ***, indicate significant differences in the level of
5 percent, 1 percent and 0.1 percent.

Table 3. Comparing means of different levels of
growth regulators NAA, Kinetin and explants on traits
evaluated to investigate embryogenesis in chamomile

Case Factors      Levels of          Embryogenesis
of study           factors            percentage

NAA (mg/l)            0          3.51 [+ or -] 16.06b
                     0.5        5.27 [+ or -] (a) 45.02
                      1         5.07 [+ or -] (a) 42.96
                      2         5.62 [+ or -] (a) 34.08
Kinetin (mg/l)        0         4.31 [+ or -] (b) 20.04
                     0.5        39.12 (a) [+ or -] 4.94
                      1         46.97 (a) [+ or -] 5.31
                      2         35.11 (a) [+ or -] 5.14
Explants             Stem       4.71 [+ or -] (a) 41.64
                 Axiliary bud   4.54 [+ or -] (a) 33.01
                 Axis of leaf   5.02 [+ or -] (a) 31.06

* Numerical data with the similar alphabetical indices,
based on Duncan's Compare Mean at the probability
level of 5 percent are not significantly different.
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Author:Adibian, Mohammad
Publication:Journal of Pure and Applied Microbiology
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Date:Sep 1, 2018
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