Biotechnology Bulletin ›› 2019, Vol. 35 ›› Issue (10): 34-39.doi: 10.13560/j.cnki.biotech.bull.1985.2019-0780

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Mechanism of Nitrate Regulating Symbiotic Nitrogen Fixation Between Legumes and Rhizobium

LUO Zhen-peng1, 2, XIE Fang1   

  1. 1. National Key Laboratory of Plant Molecular Genetics,CAS Center for Excellence in Molecular Plant Sciences,Shanghai Institute of Plant Physiology and Ecology,Chinese Academy of Sciences,Shanghai 200032;
    2. University of the Chinese Academy of Sciences,Beijing 100049
  • Received:2019-08-27 Online:2019-10-26 Published:2019-09-30

Abstract: Nitrogen is one of major macronutrients to support plants growth and development. Nitrate-nitrogen not only can be directly absorbed and utilized by plants,also affects the development and growth of plants via acting as a molecular signal to regulate the expressions of genes related to nitrogen-responding,absorbing and metabolizing. Legumes plants can obtain the demanded nitrogen for plant growth by establishing a symbiotic interaction with rhizobia;however,nodule formation and nitrogen fixation are energy-consuming processes for plants. When there is high concentration of nitrogen in soil,nitrogen as a signal molecule will affect the function of symbiotic nitrogen fixation gene and thus inhibit the process of symbiotic nitrogen fixation. Current researches reveal that nitrate inhibits symbiotic nitrogen fixation through a local and systemic regulation pathway. Autoregulation of nodulation(AON)and NIN-like proteins(NLPs)play a critical role in symbiotic nitrogen fixation. Combined with the latest researches,this review focuses on discussing the roles of NLPs transcription factors and AON pathways in symbiotic nitrogen fixation.

Key words: nitrate, symbiotic nitrogen fixation, NLPs transcription factor, AON pathway, CEP short peptide