rpc00055: Arabidopsis thaliana gnom callus culture

Note

  1. Components
  • Two 9-cm Petri dishes, containing cells placed on semi-solid medium
  1. Notice
  • Subculture the cells to fresh medium immediately after arrival.
  • Do not store the cell culture in a refrigerator and a freezer.
  • Maintain aseptic conditions of the cell culture, and work in a laminar flow cabinet.
  1. Summary
  • Culture medium: mMS medium, 1 mg/L 2,4-D, 0.8% (w/v) agar, pH 5.8 (medium no. 43)
  • Culture conditions: 23°C, dark
  • Subculture: 28-day intervals
  1. Citation of cell line

    When results obtained by using this cell line are published in a scientific journal, it should be cited in the following manner: “Arabidopsis thaliana gnom cell line (rpc00055) was provided by the RIKEN BRC which is participating in the National BioResource Project of the MEXT/AMED, Japan.”

Introduction

Arabidopsis gnom cell line was established from a root of Arabidopsis thaliana (L.) Heynh. gnom mutant (Ueda et al. 2004 [2]). GNOM encodes a GDP/GTP exchange factor for small G-proteins of the ADP ribosylation factor class (Geldner et al. 2003 [1]). The gnom mutant plants show severe growth arrest, but the gnom cell culture proliferate normally like wild-type cells (Ueda et al. 2004). The gnom cells are grown on a modified Murashige and Skoog (mMS) medium supplemented with 1 mg/L 2,4-dichlorophenoxyacetic acid (2,4-D) and solidified with 0.8% (w/v) agar, pH 5.8. Our gnom cell culture has been maintained in the dark at 23°C and subcultured at 28-day intervals.

Materials

Chemicals and stock solutions

(All stock solutions are stored at 4°C)
  • MS salt mix

    Murashige and Skoog Plant Salt Mixture, Wako Pure Chemical Industries (#392-00591)

  • Sucrose

  • KH2PO4 (100 mg/mL)

    Chemical Concentration (mg/mL)
    KH2PO4 100
  • B5_VT

    Chemical Concentration (mg/mL)
    Nicotinic acid 0.4
    Pyridoxine·HCl 0.4
    Thiamine·HCl 4
    myo-Inositol 40
  • 2,4-D (0.2 mg/mL)

    Chemical Concentration (mg/mL)
    2,4-D sodium monohydrate 0.236

    (2,4-Dichlorophenoxy)acetic acid sodium salt monohydrate, Sigma-Aldrich (D6679)

  • Agar, powder

  • KOH (1 N)

Glassware and equipment

  • Erlenmeyer flask (100 mL), capped with two layers of aluminum foil
  • Forceps, sterilized before use

Preparation of mMS medium (medium no. 43)

  1. Dissolve the following chemicals in approximately 800 mL of distilled water.

    Chemical Amount
    MS salt mix 1 bag (1 L)
    Sucrose 20 g
  2. Add following stock solutions, and fill up to approximately 950 mL with distilled water.

    Stock solution Volume (mL)
    KH2PO4 (100 mg/mL) 3.4
    B5_VT 5
    2,4-D (0.2 mg/mL) 5
  3. Adjust the pH of the solution to 5.8 with KOH (1 N), and fill up to 1 L with distilled water.

  4. Pour 40 mL of the medium into a 100-mL flask containing 0.32 g of agar.

  5. Autoclave the flask at 121°C for 20 min.

Methods

  1. Pick up an appropriate amount of callus cells from a 28-day-old culture with a forceps and place the cells onto fresh mMS medium.
  2. Incubate cell cultures under the dark condition at 23°C.

Notes

  • We send gnom cells on semi-solid mMS medium in a 9-cm plastic Petri dish. The cells should be subcultured to fresh mMS medium immediately after arrival.
  • In order to maintain gnom callus culture stably, it is essential to observe the growth of cells carefully. Because proliferation of gnom cells is affected by culture conditions, such as a room temperature, aeration conditions of the culture and so on, an amount of cells transferred to fresh medium and the subculture intervals may vary from one lab to another. We usually inoculate five pieces of gnom callus (about 5-mm in diameter) on 40 mL of mMS medium in a 100-mL flask, and culture them for 28 days.

Maintenance history

References

[1]Geldner N, Anders N, Wolters H, Keicher J, Kornberger W, Muller P, Delbarre A, Ueda T, Nakano A, Jürgens G (2003) The Arabidopsis GNOM ARF-GEF mediates endosomal recycling, auxin transport, and auxin-dependent plant growth. Cell 112: 219–230. DOI: 10.1016/S0092-8674(03)00003-5
[2]Ueda T, Uemura T, Sato MH, Nakano A (2004) Functional differentiation of endosomes in Arabidopsis cells. Plant Journal 40: 783–789. DOI: 10.1111/j.1365-313X.2004.02249.x