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Article Abstract
The toxicity of aluminum (Al) in acidic soil inhibits plant development and reduces crop yields. Programmed cell death (PCD) is one of the important mechanisms in the plant response to Al toxicity. However, it is yet unknown if S-nitrosoglutathione reductase (GSNOR) provides Al-PCD. Here, transcription and protein expression of AhGSNOR1 were both induced by Al stress. AhGSNOR1-overexpressing transgenic tobacco plants reduced Al-induced nitric oxide (NO) and S-nitrosothiol accumulation, the inhibitory effect of Al stress on root elongation and the degree of cell death, and enhanced antioxidant enzyme activity to effectively remove hydrogen peroxide. In addition, AhGSNOR1 directly interacted with AhTRXh in vivo. Expression of Trxh3 in AhGSNOR1-overexpressing transgenic plants was significantly upregulated, indicating that AhGSNOR1 positively regulated the transcriptional level of Trxh3. Together, these results suggested that AhGSNOR1 was a negative regulatory factor of Al-induced PCD and improved plant Al-tolerance by modulating intracellular NO and redox homeostasis.
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| http://dx.doi.org/10.1016/j.plantsci.2024.112275 | DOI Listing |
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