=======================================================
rpc00023: *Asparagus pastorianus* A.pas callus culture
=======================================================

  :download:`Download a PDF version (137 KB) <../cell_lines/rpc00023_A_pas_2_2.pdf>`

.. 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: LS medium, 10 µM 2,4-D, 1.2% (w/v) agar, pH 5.6 (\ :doc:`medium no. 21 </media/medium_21>`\ )

     * Culture conditions: 27°C, dark

     * Subculture: 28--42-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: “*Asparagus pastorianus* A.pas cell line (rpc00023) was provided by the RIKEN BRC through the National BioResource Project of the MEXT, Japan.”

Introduction
=============

  A.pas cell line was established from *Asparagus pastorianus* Webb & Berthel. The A.pas cells are grown on a Linsmaier and Skoog (LS) medium supplemented with 10 µM 2,4-dichlorophenoxyacetic acid (2,4-D), and solidified with 1.2% (w/v) agar, pH 5.6. Our A.pas cell culture has been maintained in the dark at 27°C and subcultured at 28--42-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

    .. csv-table::
       :header: "Chemical", "Concentration (mg/mL)"
       :widths: auto

       "Thiamine·HCl", "0.16"
       "*myo*-Inositol", "40"

* 2,4-D (1 mM)

    .. csv-table::
       :header: "Chemical", "Concentration (mg/mL)"
       :widths: auto

       "2,4-D sodium monohydrate", "0.261"

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

* Agar, powder

* KOH (1 N)

Glassware and equipment
------------------------

* Erlenmeyer flask (200 mL), capped with two layers of aluminum foil

* Forceps, sterilized before use

Preparation of LS medium (medium no. 21)
-----------------------------------------

  :doc:`/media/medium_21`

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

    .. csv-table::
       :header: "Chemical", "Amount"
       :widths: auto

       "MS salt mix", "1 bag (1 L)"
       "Sucrose", "30 g"

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

    .. csv-table::
       :header: "Stock solution", "Volume (mL)"
       :widths: auto

       "LS_VT", "2.5"
       "2,4-D (1 mM)", "10"

#. Adjust the pH of the solution to 5.6 with KOH (1 N), and fill up to 1 L with distilled water.

#. Pour 80 mL of the medium into a 200-mL flask containing 0.96 g of agar.

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

Methods
========

#. Pick up an appropriate amount of callus cells from a 28--42-day-old culture with a forceps and place the cells onto fresh LS medium.

#. Incubate cell cultures under the dark condition at 27°C.

Notes
======

* We send A.pas cells on semi-solid LS medium in a 9-cm disposable Petri dish. The cells should be subcultured to fresh LS medium immediately after arrival.

* In order to maintain A.pas callus culture stably, it is essential to observe the growth of cells carefully. Because proliferation of A.pas 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 three pieces of A.pas callus (about 10-mm in diameter) on 80 mL of LS medium in a 200-mL flask, and culture them for 28--42 days.

Genotyping
===========

  :doc:`/genotyping/g_rpc00023`

Maintenance history
====================

  :doc:`/maintenance/m_rpc00023`

Protocols
==========

* Genotyping of plant cell lines: :doc:`/protocols/genotyping/asparagus`

External links
===============

* `World Flora Online: Asparagus pastorianus Webb & Berthel. <http://www.worldfloraonline.org/taxon/wfo-0000634253>`_

* `Wikipedia: Asparagus pastorianus <https://en.wikipedia.org/wiki/Asparagus_pastorianus>`_

.. index::
   single: Asparagus pastorianus
   single: A.pas