The role of auxin in nitrogen-modulated shoot branching

Plant Signal Behav. 2021 Apr 3;16(4):1885888. doi: 10.1080/15592324.2021.1885888. Epub 2021 Feb 11.


Shoot branching is determined by axillary bud formation and outgrowth and remains one of the most variable determinants of yield in many crops. Plant nitrogen (N) acquired mainly in the forms of nitrate and ammonium from soil, dominates plant development, and high-yield crop production relies heavily on N fertilization. In this review, the regulation of axillary bud outgrowth by N availability and forms is summarized in plant species. The mechanisms of auxin function in this process have been well characterized and reviewed, while recent literature has highlighted that auxin export from a bud plays a critical role in N-modulating this process.

Keywords: Ammonium; auxin; nitrate; shoot branching.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Indoleacetic Acids / metabolism*
  • Models, Biological
  • Nitrogen / pharmacology*
  • Plant Shoots / drug effects
  • Plant Shoots / genetics
  • Plant Shoots / growth & development*


  • Indoleacetic Acids
  • Nitrogen

Grants and funding

This work has been funded by the National Key R&D Program of China (2018YFD0200503), the National Nature Science Foundation of China (31972501 and 31672225), Innovative Research Team Development Plan of the Ministry of Education (IRT_17R56; KYT201802), 111 Project (number 12009)..