数字农科院2.0

Physiological, molecular, and environmental insights into plant nitrogen uptake, and metabolism under abiotic stresses

文献类型： 外文期刊

作者： Akhtar, Kashif;Ain, Noor ul;Prasad, P. V. Vara;Naz, Misbah;Aslam, Mehtab Muhammad;Djalovic, Ivica;Riaz, Muhammad;Ahmad, Shakeel;Varshney, Rajeev K.;He, Bing;Wen, Ronghui

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期刊名称： PLANT GENOME

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年卷期： 2024 年

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收录情况： SCIE（2024版）

摘要： Nitrogen (N) as an inorganic macronutrient is inevitable for plant growth, development, and biomass production. Many external factors and stresses, such as acidity, alkalinity, salinity, temperature, oxygen, and rainfall, affect N uptake and metabolism in plants. The uptake of ammonium (NH4+) and nitrate (NO3-) in plants mainly depends on soil properties. Under the sufficient availability of NO3- (>1 mM), low-affinity transport system is activated by gene network NRT1, and under low NO3- availability (<1 mM), high-affinity transport system starts functioning encoded by NRT2 family of genes. Further, under limited N supply due to edaphic and climatic factors, higher expression of the AtNRT2.4 and AtNRT2.5T genes of the NRT2 family occur and are considered as N remobilizing genes. The NH4+ ion is the final form of N assimilated by cells mediated through the key enzymes glutamine synthetase and glutamate synthase. The WRKY1 is a major transcription factor of the N regulation network in plants. However, the transcriptome and metabolite profiles show variations in N assimilation metabolites, including glycine, glutamine, and aspartate, under abiotic stresses. The overexpression of NO3- transporters (OsNRT2.3a and OsNRT1.1b) can significantly improve the biomass and yield of various crops. Altering the expression levels of genes could be a valuable tool to improve N metabolism under the challenging conditions of soil and environment, such as unfavorable temperature, drought, salinity, heavy metals, and nutrient stress.

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