rpc00084: Nicotiana tabacum NI cell suspension culture

Note

  • Components

    • Domestic delivery: A 50-mL plastic conical centrifuge tube, containing cell suspension

    • Overseas delivery: A 250-mL plastic Erlenmeyer flask, 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: mLS medium, 10 µM NAA, 1 µM kinetin, pH 5.7 (medium no. 55)

    • Culture conditions: 24°C, continuous light, 90 rpm

    • Subculture: 21-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: “Nicotiana tabacum NI cell line (rpc00084) was provided by the RIKEN BRC through the National BioResource Project of the MEXT, Japan.”

Introduction

Tobacco NI cell line was established from a pith of Nicotiana tabacum L. cultivar Samsun NN (Takeda et al. 1990 [1]). The NI is a green photoautotrophic cell culture, which can grow in the light without organic carbon sources (Yamada and Sato 1978 [2]). The NI cells are grown in a modified Linsmaier and Skoog (mLS) medium supplemented with 10 µM 1-naphthaleneacetic acid (NAA) and 1 µM kinetin, pH 5.7. Our NI cell culture has been maintained under the continuous light at 24°C with rotary shaking at 90 rpm and subcultured at 21-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

  • LS_VT

    Chemical

    Concentration (mg/mL)

    Thiamine·HCl

    0.16

    myo-Inositol

    40

  • NAA (1 mM)

    Chemical

    Concentration (mg/mL)

    NAA·K

    0.224

    Potassium 1-naphthylacetate, FUJIFILM Wako Pure Chemical Corporation (#161-04021)

  • Kinetin (1 mM)

    Chemical

    Concentration (mg/mL)

    Kinetin

    0.215

    Dissolve kinetin in small volume of KOH (1 N), and fill up with distilled water

  • KOH (1 N)

Glassware and equipment

  • Erlenmeyer flask (100 mL), capped with two layers of aluminum foil

  • Laboratory dispensing spoon (head size, 1.2 × 0.8 cm), sterilized before use

Preparation of mLS medium (medium no. 55)

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

    Chemical

    Amount

    MS salt mix

    1 bag (1 L)

    Sucrose

    30 g

  2. Add following stock solutions, and fill up to approximately 950 mL with distilled water.

    Stock solution

    Volume (mL)

    LS_VT

    5

    NAA (1 mM)

    10

    Kinetin (1 mM)

    1

  3. Adjust the pH of the solution to 5.7 with KOH (1 N), and fill up to 1 L with distilled water.

  4. Pour 25 mL of the medium into a 100-mL flask.

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

Methods

  1. Transfer one to two spoons of cells from a 21-day-old culture into 25 mL of fresh mLS medium with a laboratory dispensing spoon.

  2. Incubate cell cultures on a rotary shaker at 90 rpm under the continuous light condition (photosynthetic photon flux density 50–60 µmol m-2 s-1) at 24°C.

Notes

  • For domestic customers: We send NI cell suspension in a 50-mL disposable conical centrifuge tube. The cells should be transferred to fresh mLS medium immediately after arrival. Transfer settled cells to Erlenmeyer flasks containing fresh liquid medium with a pipette.

  • For overseas customers: We send NI cells placed on semi-solid mLS medium in a 250-mL disposable Erlenmeyer flask. The cells should be transferred to fresh mLS medium immediately after arrival. Collect the cells from the semi-solid medium with a spatula and transfer them to Erlenmeyer flasks containing fresh liquid medium.

  • In order to maintain NI cell suspension cultures stably, it is essential to transfer an adequate amount of cells to fresh mLS medium in every subculture. The amount of cells may vary from one lab to another, because proliferation of NI cells is affected by culture conditions, such as a room temperature, rotation speed of a rotary shaker, and aeration condition of the culture.

  • In order to obtain good aeration of a suspension culture, a silicone sponge plug may be used instead of the aluminum foil cap (e.g., cap-type Silicosen; Shin-Etsu Polymer, Tokyo, Japan).

  • NI cells completely absorb the culture medium after 21 days of culture. The green NI cells can grow after subculturing into a fresh medium.

Maintenance history

References