Abstract
Main conclusion
NBT and HE may be efficiently used for the detection of superoxide, while DCDHF-DA and DHR123 for the detection of peroxynitrite in intact barley root tips, only if PRXs and oxidoreductases are inhibited to avoid false-positive reactions.
Abstract
Strong peroxidase (PRX) and oxidoreductase activities were observed in the barley root tips that were markedly inhibited by NaN3. Rapid and strong nitro-blue tetrazolium chloride (NBT) reduction is associated mainly with the vital functions of root cells but not with superoxide formation. In turn, the inhibition of root surface redox activity by NaN3 strongly reduced the formation of formazan, but its slight accumulation, observed in the root elongation zone, was a result of NADPH oxidase-mediated apoplastic superoxide formation. A longer staining time period with NBT was required for the detection of antimycin A-mediated superoxide formation inside the cells. This antimycin A-induced superoxide was clearly detectable by hydroethidine (HE) after the inhibition of PRXs by NaN3, and it was restricted into the root transition zone. TEMPOL, a superoxide scavenger, strongly inhibited both NBT reduction and HE oxidation in the presence of NaN3. Similarly, the DCDHF-DA and DHR123 oxidation was markedly reduced after the inhibition of apoplastic PRXs by NaN3 and was detectable mainly in the root transition zone. This fluorescence signal was not influenced by the application of pyruvate but was strongly reduced by urea, a peroxynitrite scavenger. The presented results suggest that if the root PRXs and oxidoreductases are inhibited, both NBT and HE detect mainly superoxide, whereas both DCDHF-DA and DHR123 may be efficiently used for the detection of peroxynitrite in intact barley root tips. The inhibition of PRXs and oxidoreductases is crucial for avoiding false-positive reactions in the localization of reactive oxygen species in the intact barley root tip.
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Abbreviations
- DCDHF-DA:
-
2,7-Dichlorodihydrofluorescein diacetate
- DHR123:
-
Dihydrorhodamine 123
- HE:
-
Hydroethidine
- NBT:
-
Nitro-blue tetrazolium chloride
- NOX:
-
NADPH oxidase
- PRX:
-
Peroxidase
- ROS:
-
Reactive oxygen species
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This work was supported by the Grant Agency VEGA, Project No. 2/0039/20. The authors would also like to thank the anonymous reviewers for their helpful criticisms, who improved the manuscript.
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Valentovičová, K., Demecsová, L., Liptáková, Ľ. et al. Inhibition of peroxidases and oxidoreductases is crucial for avoiding false-positive reactions in the localization of reactive oxygen species in intact barley root tips. Planta 255, 69 (2022). https://doi.org/10.1007/s00425-022-03850-1
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DOI: https://doi.org/10.1007/s00425-022-03850-1