Nitrogen (N) is a necessary nutrient for plant development and seed production, with nitrate (NO3-) serving as the primary source of N in soils. Although several molecular players in plant responses to NO3- signaling were unraveled, it is still a complex process with gaps that require further investigation. The aim of our study is to analyze the role of nitric oxide (NO) in the primary nitrate response (PNR).
Results:
Using a combination of genetic and pharmacological approaches, we demonstrate that NO is required for the expression of the NO3--regulated genes nitrate reductase 1 (NIA1), nitrite reductase (NIR), and nitrate transporters (nitrate transporter 1.1 [NRT1.1] and nitrate transporter 2.1 [NRT2.1]) in Arabidopsis. The PNR is impaired in the Arabidopsis mutant noa1, defective in NO production. Our results also show that PHYTOGLOBIN 1 (PHYTOGLB1), involved in NO homeostasis, is rapidly induced during PNR in wild type (wt) but not in the mutants of the nitrate transceptor NTR1.1 and the transcription factor nodule inception-like protein 7 (NLP7), suggesting that the NRT1.1-NLP7 cascade modulates PHYTOGLB1 gene expression. Biotin switch experiments demonstrate that NLP7, the PNR-master regulator, is S-nitrosated in vitro. Depletion of NO during PNR intensifies the decrease in reactive oxygen species levels and the rise of catalase (CAT) and ascorbate peroxidase (APX) enzyme activity.
Conclusion and Innovation:
NO, a by-product of NO3- metabolism and a well-characterized signal molecule in plants, is an important player in the PNR.
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