Biotechnology Bulletin ›› 2019, Vol. 35 ›› Issue (10): 40-45.doi: 10.13560/j.cnki.biotech.bull.1985.2019-0657

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Research Progresses on the Mechanism of High Nitrogen Inhibiting Nodulation and Nitrogen Fixation in Legumes

KE Dan-xia1, XU Qin-zhen1, YANG Na1, BAI Meng-yan1, GUAN Yue-feng2   

  1. 1. College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002;
    2. Center for Horticultural Biology and Metabolomics,Fujian Agricultural and Forestry University,Fuzhou,Fujian 3500002
  • Received:2019-07-25 Online:2019-10-26 Published:2019-09-30

Abstract:

Legumes form nodules and fix nitrogen by symbiosis with rhizobium. The nodulation and nitrogen fixation in legumes is of great significance in agriculture,such as reducing chemical fertilizer application,increasing farmers' benefit and improving soil environment. However,high nitrogen inhibits the nodulation and nitrogen fixation in legumes,forming a “nitrogen repression” effect. This paper discusses the molecular mechanism of high nitrogen inhibiting nodulation in legumes,including the recent progress in inhibiting the number of nodulations and development via pathways such as autoregulation of nodulation,NLP transcription factor and plant hormone signal,and explores te hypothesis and controversy on high nitrogen inhibiting the nodular nitrogenase activity,including nitrite toxicity and carbon starvation,aiming at providing theoretical basis for legumes to cope with nitrogen repression.

Key words: nitrate, legumes, nodulation, nitrogen fixation, inhibition