Nitrogen is an essential component for plant growth and development. Plants generally take up nitrogen from their environment in the form of nitrates or ammonium and assimilate them into amino acids with the help of the products of nitrate or ammonium assimilation genes, respectively. Transcription factors (TFs) regulate this activity, while also modifying the rate of nitrate assimilation depending on the changes in nitrogen levels. In nitrogen deficient condition, these TFs positively regulate the expression of nitrate assimilation genes.
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Source: Phys.org