Researchers have demonstrated that reducing nitric oxide (NO) levels in plants significantly improves nitrogen uptake and nitrogen use efficiency (NUE) in rice and Arabidopsis.
Nitrogen Use Efficiency (NUE)
- NUE describes the efficiency of nitrogen use by plants, whether applied as fertilizer or fixed from the atmosphere for biomass production.
- It is measured as the ratio between crop yield and nitrogen absorbed from the soil or atmosphere.
Key findings of the study
- This study highlights a promising approach to sustainable agricultural practices by encouraging methods to reduce NO levels in plants.
- Importance of Nitric Oxide (NO)
- Nitric oxide (NO) plays an important role in regulating various physiological processes in plants.
- Reducing NO levels activates high-affinity nitrate transporters (HATs), which are particularly effective under limiting nitrogen conditions.
- High-Affinity Nitrate Transporters (HATs): ‘ High-Affinity Nitrate Transporters’ are required for nitrogen absorption specifically under low nitrogen conditions.
Methods used to improve NUE pharmacological transformation
- The researchers used chemical compounds called nitric oxide (NO) ‘scavengers’ to reduce the concentration of NO in plants.
- High in Phytoglobin: Phytoglobin, a natural nitric oxide scavenger, has been found in abundance in plants.
- This led to the increased expression of high-affinity nitrate transporters (HATs) , such as NRT2.1 and NRT2.4 , which enhance nitrogen uptake under low NO conditions.
- Genetic modification: Genetic modification involves altering the genes of plants to regulate nitric oxide levels in cells.
- Protein Nitrosylation: Protein nitrosylation, a biochemical modification by nitric oxide, plays an important role in nitrogen regulation.
- Targeting protein nitrosylation has shown the potential to improve NUE.
Importance of improving NUE
- Increasing NUE helps reduce excessive use of nitrogen fertilizers.
- It reduces environmental pollution including nitrate leaching and greenhouse gas emissions.
- Improved NUE contributes to consistently higher crop yields.