Abstract
During 30-months of storage at 4°C, potato (Solanum tuberosum L.) tubers progressively lose the ability to produce superoxide in response to wounding, resist microbial infection, and develop a suberized wound periderm. Using differentially aged tubers, we demonstrate that Strboh A is responsible for the wound-induced oxidative burst in potato and aging attenuates its expression. In vivo superoxide production and NADPH oxidase (NOX) activity from 1-month-old tubers increased to a maximum 18–24 h after wounding and then decreased to barely detectable levels by 72 h. Wounding also induced a 68% increase in microsomal protein within 18 h. These wound-induced responses were lost over a 25- to 30-month storage period. Superoxide production and NOX activity were inhibited by diphenylene iodonium chloride, a specific inhibitor of NOX, which in turn effectively inhibited wound-healing and increased susceptibility to microbial infection and decay in 1-month-old tubers. Wound-induced superoxide production was also inhibited by EGTA-mediated destabilization of membranes. The ability to restore superoxide production to EGTA-treated tissue with Ca+2 declined with advancing tuber age, likely a consequence of age-related changes in membrane architecture. Of the five homologues of NOX (Strboh A-D and F), wounding induced the expression of Strboh A in 6-month-old tubers but this response was absent in tubers stored for 25–30 months. Strboh A thus mediates the initial burst of superoxide in response to wounding of potato tubers; loss of its expression increases the susceptibility to microbial infection and contributes to the age-induced loss of wound-healing ability.
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Abbreviations
- CaM:
-
Calmodulin
- CL:
-
Chemiluminescence
- DPI:
-
Diphenylene iodonium chloride
- NOX:
-
NADPH oxidase
- NBT:
-
Nitroblue tetrazolium
- OB:
-
Oxidative burst
- PAL:
-
Phenylalanine ammonia lyase
- POX:
-
Peroxidase
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
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Acknowledgments
This work was supported by the USDA/ARS (project no. 11D-3055-5461) and the Agricultural Research Center, Washington State University.
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Kumar, G.N.M., Iyer, S. & Knowles, N.R. Strboh A homologue of NADPH oxidase regulates wound-induced oxidative burst and facilitates wound-healing in potato tubers. Planta 227, 25–36 (2007). https://doi.org/10.1007/s00425-007-0589-9
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DOI: https://doi.org/10.1007/s00425-007-0589-9