Plant/Fungi DNA Isolation Kit Protocol

Product No. E5038

Norgen’s Plant/Fungi DNA Isolation Kit provides a rapid method for the isolation and purification of total DNA from a wide range of plant and fungi species. Furthermore, the kit also provides a convenient method for the detection of pathogens which may be infecting a plant, as it allows for the purification of any pathogen DNA along with the purification of the total DNA. Total DNA can be purified from fresh or frozen plant tissues, plant cells or fungi samples using this kit. The DNA is preferentially purified from other cellular components, such as proteins, without the use of phenol or chloroform. The purified DNA is of the highest integrity, and can be used in a number of downstream applications including real time PCR, Southern blotting, SNP analysis and sequencing.

Norgen’s Purification Technology

Purification is based on spin column chromatography. The DNA is preferentially purified from other cellular components such as proteins without the use of phenol or chloroform. The process involves grinding plant tissue in a mortar with liquid nitrogen (or alternative homogenization equipment). Lysis Solution and RNase A are then added, followed by a short incubation at 65 °C. Next, Binding Solution is then added to the lysate followed by another short incubation on ice. The lysate is then spun through the provided Filter Column in order to remove any debris. Ethanol is then added to the clarified lysate, and the solution is loaded onto a spin-column. Norgen’s resin binds nucleic acids in a manner that depends on ionic concentrations, thus only the DNA will bind to the column while most of the RNA and proteins are removed in the flowthrough. The bound DNA is then washed with the provided Wash Solution I and II in order to remove any remaining impurities, and the purified total DNA is eluted with the Elution Buffer. The purified DNA is of the highest integrity, and can be used in a number of downstream applications.

Specifications

* average yields will vary depending upon a number of factors including species, growth conditions used and developmental stage.

Kit Components

Advantages

• Fast and easy processing using a rapid spin-column format
• Adaptable with current cell homogenization methods
• No phenol or chloroform extractions
• Isolate high quality total DNA from a variety of plant and fungal species, including any pathogen DNA
• High yields of total DNA

Storage Conditions and Product Stability

All solutions should be kept tightly sealed and stored at room temperature, except for the RNAse which should be stored at -20 °C.

Precautions and Disclaimers

This kit is designed for research purposes only. It is not intended for human or diagnostic use. Ensure that a suitable lab coat, disposable gloves and protective goggles are worn when working with chemicals. For more information, please consult the appropriate Material Safety Data Sheets (MSDSs). These are available as convenient PDF files online at www.norgenbiotek.com.

Wash Solution I contains guanidinium salts and should be handled with care. Guanidinium salts forms highly reactive compounds when combined with bleach, thus care must be taken to properly dispose of any of these solutions.

Customer-Supplied Reagents and Equipment

You must have the following in order to use the Plant/Fungi DNA Isolation Kit:

• Benchtop microcenrifuge
• 65 °C Incubator
• Ice bath
• 96-100 % ethanol
• 70 % ethanolv
• Liquid nitrogen or any mechanical homogenizer

Procedures

All centrifugation steps are carried out in a benchtop microcentrifuge. Various speeds are required for different steps, so please check your microcentrifuge specifications to ensure that it is capable of the proper speeds. All centrifugation steps are performed at room temperature. The correct rpm can be calculated using the formula:

where RCF = required gravitational acceleration (relative centrifugal force in units of g); r = radius of the rotor in cm; and RPM = the number of revolutions per minute required to achieve the necessary g-force.

Notes Prior to Use

• All centrifugation steps are carried out in a benchtop microcentrifuge at 10,000 x g (~ 10,000 RPM) except where noted. All centrifugation steps are performed at room temperature.
• A variable speed centrifuge should be used for maximum kit performance. If a variable speed centrifuge is not available a fixed speed centrifuge can be used, however reduced yields may be observed.
• Ensure that all solutions are at room temperature prior to use. If necessary, warm to 65 °C to redissolve precipitates.
• Prepare a working concentration of Wash Solution I by adding 24 mL of 96 -100% ethanol (to be provided by the user) to the supplied bottle containing concentrated Wash Solution I. This will give a final volume of 42 mL. The label on the bottle has a box that can be checked to indicate that ethanol has been added.
• Prepare a working concentration of the Wash Solution II by adding 70 mL of 96 - 100 % ethanol (provided by the user) to the supplied bottle containing the concentrated Wash Solution II. This will give a final volume of 100 mL. The label on the bottle has a box that may be checked to indicate that the ethanol has been added.
• Store the RNase A solution at 4 °C for up to 3 months. For longer storage, the RNase A solution should be divided into small aliquots and stored at -20 °C.
• It is recommended that no more than 100 mg of fungi (wet weight) or 100 mg of plant tissue be used for this procedure in order to prevent clogging of the column. However, in some cases it may be possible to increase the amount of plant material processed up to 150 mg depending on the DNA content of the plant.
• This kit is provided with 2 separate columns. When columns are removed from the labeled bags they are supplied in they can easily be identified as follows:
  • Filter Columns – contains a clear plastic O-ring
  • Spin Columns – contains a grey plastic O-ring

1. Lysate preparation
   1. Place ≤100 mg of plant tissue or wet fungi into a mortar that contains liquid Nitrogen and grind into a powder. Transfer the plant or fungi powder to a DNase-free 1.7 mL microcentrifuge tube (not provided) and add 500 µL of Lysis Solution and 1 µL of RNase A.
      Alternatively, other homogenization methods can be used with this procedure, including a bead system. If an alternative method is used, add 500 µL of Lysis Solution and 1 µL of RNase A to the sample immediately after homogenization and vortex for 20 seconds to mix.
   2. Incubate at 65 ºC for 10 minutes. Occasionally mix the lysate 2 or 3 times during incubation by inverting the tube.
   3. Add 100 µL of Binding Solution, mix thoroughly and incubate for 5 minutes on ice.
   4. Assemble a Filter Column (clear O-ring) with one of the provided collection tubes. Pipette the lysate into Filter Column and spin for 2 minutes at 14,000 x g (~14,000 RPM).
   5. Transfer only the clear supernatant from the flow-through into a DNase-free microcentrifuge tube (not provided) using a pipette.
   6. Add an equal volume of 70% ethanol (provided by the user) to the lysate collected above (100 µL of ethanol is added to every 100 µL of lysate). Vortex to mix. Proceed to Step 2.
2. Binding to Column
   1. Assemble a Spin Column (grey O-ring) with one of the provided collection tubes.
   2. Apply up to 650 µL of the clarified lysate with ethanol onto the Spin Column and centrifuge for 1 minute at 10,000 × g (~10,000 RPM). Discard the flowthrough and reassemble the spin column with the collection tube.
      Note: Ensure the entire lysate volume has passed through into the collection tube by inspecting the column. If the entire lysate volume has not passed, spin for an additional minute.
   3. Depending on your lysate volume, repeat step 2.2 if necessary.
3. Column Wash
   1. Apply 500 µL of Wash Solution I to the column and centrifuge for 1 minute.
   2. Discard the flowthrough and reassemble the spin column with its collection tube.
   3. Apply 500 µL of Wash Solution II to the column and centrifuge for 1 minute.
   4. Discard the flowthrough and reassemble the spin column with its collection tube.
   5. Repeat Step 3.3 and 3.4.
   6. Spin the column for 2 minutes at 14,000 x g (~14,000 RPM) in order to thoroughly dry the resin. Discard the collection tube.
4. DNA Elution
   1. Place the column into a fresh 1.7 mL Elution tube provided with the kit.
   2. Add 100 µL of Elution Buffer to the column and incubate for 1 minute at room temperature.
   3. Centrifuge for 1 minute at 10,000 x g (~10,000 RPM). Note the volume eluted from the column. If the entire volume has not been eluted, spin the column at 14,000 x g (~14,000 RPM) for 1 additional minute.
   4. (Optional): An additional elution may be performed if desired by repeating steps 4.2 and 4.3 using 50 µL of Elution Buffer in a different elution tube. The total yield can be improved by an additional 20-30% when this second elution is performed.
5. Storage of DNA
   The purified genomic DNA can be stored at 2-8 °C for a few days. For longer term storage, -20 °C is recommended.

Troubleshooting Guide