rpc00055: Arabidopsis thaliana gnom callus culture
Note
Components
A 9-cm plastic Petri dish, containing cells placed on semi-solid medium
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.
Method
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
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 through the National BioResource Project of the MEXT, 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 [2]). 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, FUJIFILM Wako Pure Chemical Corporation (#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)
Dissolve the following chemicals in approximately 800 mL of distilled water.
Chemical
Amount
MS salt mix
1 bag (1 L)
Sucrose
20 g
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
Adjust the pH of the solution to 5.8 with KOH (1 N), and fill up to 1 L with distilled water.
Pour 40 mL of the medium into a 100-mL flask containing 0.32 g of agar.
Autoclave the flask at 121°C for 20 min.
Methods
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.
Incubate cell cultures under the dark condition at 23°C.
Notes
We send gnom cells on semi-solid mMS medium in a 9-cm disposable 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.