Original research article

The authors used this protocol in:
Oct 2013
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Histochemical Detection of Superoxide and H2O2 Accumulation in Brassica juncea Seedlings    

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Abstract

Plant cells continually produce reactive oxygen species (ROS) as a by-product of aerobic metabolism. Increased production of ROS occurs under unfavorable conditions imposed by various abiotic and biotic factors. Accumulation of ROS is damaging to various cellular components and macromolecules including plasma membrane, nucleic acids, and proteins and eventually leads to cell death. In this protocol, we describe the histochemical detection of hydrogen peroxide (H2O2) and superoxide (O2-) anion, two of the most important ROS, in Brassica juncea seedlings by using 3,3ʹ-Diaminobenzidine (DAB) and Nitrotetrazolium blue chloride (NBT) as the chromogenic substrate. DAB is oxidized by H2O2 in the presence of peroxidases and produces reddish brown precipitate. NBT reacts with O2- to form a dark blue insoluble formazan compound. The protocol can be used in other plant species and for different plant tissues.

Materials and Reagents

  1. Brassica juncea seedlings
  2. Vermiculite
  3. Absolute ethanol
  4. 60% Glycerol
  5. Aluminium foil
  6. Test tubes
  7. Measuring cylinder
  8. Distilled water
  9. Nitrotetrazolium blue chloride (NBT) (Sigma-Aldrich, catalog number: N6639 )
  10. 3,3ʹ-Diaminobenzidine (DAB) (Sigma-Aldrich, catalog number: D8001 )
  11. Sodium phosphate buffer (see Recipes)
  12. NBT staining solution (see Recipes)
  13. DAB staining solution (see Recipes)

Equipment

  1. Paper towel
  2. Weighing balance
  3. Aluminium foil
  4. Magnetic stirrer
  5. pH meter
  6. Water bath

Procedure

  1. Brassica juncea seedlings grown on vermiculite for 15 days at 22 °C, 75 % relative humidity, and a photoperiod of 16 h light and 8 h dark are treated with a stress inducing agent [for e.g. 200 mM NaCl (for salinity stress), 200 mM mannitol (for drought stress), or 20 mM CdCl2 (for heavy metal stress) for 3 days]. The untreated seedlings grown under the same conditions serve as the experimental control.
  2. Remove the seedlings from the pot and wash them with distilled water to remove any extraneous material associated with the tissues.
  3. Place the seedlings in test tubes and immerse them in DAB or NBT staining solution for detection of H2O2 or O2-, respectively. Wrap the tubes with aluminium foil and keep overnight at room temperature.
  4. Drain off the staining solution from the test tubes.
  5. Remove the chlorophyll for proper visualization of the stain. This is done by immersing the seedlings in absolute ethanol and heating in a boiling water-bath for 10 min (or more if necessary, with intermittent shaking).
  6. Transfer the seedlings on a paper towel saturated with 60% glycerol.
  7. Photograph the stained seedlings against a contrast background for proper documentation. H2O2 is visualized as reddish brown stain formed by the reaction of DAB with the endogenous H2O2 (Figure 1a). The O2- content is detected as dark blue stain of formazan compound formed as a result of NBT reacting with the endogenous O2- (Figure 1b).


    Figure 1. Detection of Hydrogen peroxide (a) and superoxide anion (b) accumulation in Brassica juncea seedlings exposed to 200 mM NaCl stress for 3 days. Seedlings grown in the presence of water served as the untreated control.

Recipes

  1. Sodium phosphate buffer (pH 7.5)
    1. Prepare 1 M Sodium phosphate monobasic (NaH2PO4) solution by dissolving 12 g NaH2PO4 in a final volume of 100 ml distilled water.
    2. Prepare 1 M Sodium phosphate dibasic (Na2HPO4) solution by dissolving 14.2 g Na2HPO4 in a final volume of 100 ml distilled water.
    3. Mix 16 ml 1 M NaH2PO4 and 84 ml 1 M Na2HPO4 solutions and make the volume to 2 L with distilled water for preparing 50 mM sodium phosphate buffer (pH 7.5).
  2. DAB staining solution
    1. Dissolve 50 mg DAB in approximately 45 ml distilled water in an amber colored bottle.
    2. Adjust the pH to 3.8 using 0.1 N HCl while mixing properly on a magnetic stirrer. On complete dissolution the solution will be clear and light brown in color.
    3. Make the volume to 50 ml to get 1 mg/ml solution.
    4. DAB staining solution should be prepared freshly before use.
  3. NBT staining solution
    1. In an amber colored bottle, dissolve 0.1 g NBT in 50 mM sodium phosphate buffer (pH 7.5) and make the volume to 50 ml to get a 0.2% solution.
    2. Mix the solution thoroughly using a magnetic stirrer.
    3. NBT staining solution should be prepared freshly before use.

Acknowledgments

The protocol was implemented in a project that was partially funded by the Council of Scientific and Industrial Research (CSIR) Grant No. 38/1126/EMR-II. DK and PS acknowledge the financial support from CSIR and University Grants Commission (UGC). MAY was a UGC-Dr. D.S. Kothari Postdoctoral Fellow during the course of this project. Research in the laboratory of NBS is supported by U.G.C.-C.A.S., U.G.C.-R.N.W., Department of Science and Technology (D.S.T.)-F.I.S.T., and D.S.T.-PURSE. The authors would like to acknowledge Thordal-Christensen et al. (1997) and Jabs et al. (1996) (kindly see the reference section) whose work was adapted in the present protocol.

References

  1. Jabs, T., Dietrich, R. A. and Dangl, J. L. (1996). Initiation of runaway cell death in an Arabidopsis mutant by extracellular superoxide. Science 273(5283): 1853-1856. 
  2. Kumar, D., Yusuf, M. A., Singh, P., Sardar, M. and Sarin, N. B. (2013). Modulation of antioxidant machinery in alpha-tocopherol-enriched transgenic Brassica juncea plants tolerant to abiotic stress conditions. Protoplasma 250(5): 1079-1089.
  3. Thordal-Christensen, H., Zhang, Z., Wei, Y. and Collinge, D. B. (1997). Subcellular localization of H2O2 in plants. H2O2 accumulation in papillae and hypersensitive response during the barley-powdery mildew interaction. Plant J 11: 1187-1194.
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Copyright: © 2014 The Authors; exclusive licensee Bio-protocol LLC.
How to cite: Kumar, D., Yusuf, M. A., Singh, P., Sardar, M. and Sarin, N. B. (2014). Histochemical Detection of Superoxide and H2O2 Accumulation in Brassica juncea Seedlings. Bio-protocol 4(8): e1108. DOI: 10.21769/BioProtoc.1108.
Q&A
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If you have any questions/comments about this protocol, you are highly recommended to post here. We will invite the authors of this protocol as well as some of its users to address your questions/comments. To make it easier for them to help you, you are encouraged to post your data including images for the troubleshooting.

王梦华
北京交通大学18811782715
How to dissolve DAB and NBT?I follow the method provided here, the two powders can not be completely dissolved, showing small particles.Do you have any advice? Thank you.
11/25/2019 10:51:19 AM Reply
Tagnon Missihoun
Université du Québec à Trois-Rivières
For having used this protocol in the past, I can say that it will work equally for all these treatments.
2/14/2019 6:37:32 AM Reply
Richard T Lamar
Independent Consulting
Did you use the salt (NaCl), sugar (mannitol) and heavy metal (CdCl2) solutions to water the plants for 3 days after which you harvested the plants?
2/13/2019 2:10:11 PM Reply
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