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Elevated atmospheric CO

Juan Zhou1, Yingbo Gao1,2, Junpeng Wang1

  • 1Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops College of Agriculture Yangzhou University Yangzhou China.

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Summary

Elevated CO2 stimulates rice tillering by redistributing nitrogen (N) within the plant. This adaptation strategy involves N transporters and receptors, enabling plants to maintain tiller N content despite reduced leaf N under elevated CO2.

Keywords:
atmospheric CO2distributiongene expressionnitrogenricetiller

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Area of Science:

  • Plant Science
  • Environmental Science
  • Molecular Biology

Background:

  • Elevated atmospheric CO2 (eCO2) often decreases plant nitrogen (N) content and increases tillering.
  • Reduced N is generally thought to limit tillering, creating a contradiction with eCO2 effects.

Purpose of the Study:

  • Investigate N distribution and transcriptomic changes in rice organs under eCO2 and varying N application rates.
  • Resolve the apparent contradiction between reduced N content and stimulated tillering under eCO2.

Main Methods:

  • Rice plants were subjected to eCO2 and different N application rates (0-225 kg N ha-1).
  • Nitrogen content in different plant organs (leaves, sheaths, tillers) was analyzed.
  • Transcriptomic analysis was performed to identify gene expression changes.

Main Results:

  • eCO2 significantly promoted tillering, with more tillers produced at higher N rates.
  • Leaf and sheath N content decreased under eCO2, but tiller N content remained stable or increased.
  • Transcriptomic analysis revealed differential regulation of N-related transporters (e.g., NRT2.3a/b, NRT1.1a/b) in response to eCO2.

Conclusions:

  • Nitrogen redistribution within the plant is a key adaptation to eCO2.
  • Specific N transporters and receptors play a role in sensing N signals and transporting metabolites under eCO2.
  • This N redistribution strategy may be a universal adaptation for terrestrial plants facing eCO2.