Expression of genes related to nitrogen metabolism in maize grown under organic and inorganic nitrogen supplies(Plant nutrition)

  • GUO Song
    College of Resources and Environmental Sciences, China Agricultural University
  • SUN Wen-yan
    Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
  • GU Ri-liang
    College of Resources and Environmental Sciences, China Agricultural University
  • ZHAO Bing-qiang
    Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
  • YUAN Li-xing
    College of Resources and Environmental Sciences, China Agricultural University
  • MI Guo-hua
    College of Resources and Environmental Sciences, China Agricultural University

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説明

Application of organic nitrogen (N) has been proposed as a method to reduce potential environmental pollution due to N loss without sacrificing grain yield. The mechanism responsible for organic N regulation of maize (Zea mays L.) N metabolism is nonetheless largely unknown. In this study, we compared the expression of genes related to N assimilation and remobilization during the grain filling stage in maize plants grown under field conditions. We applied five different N treatments, which consisted of N supplied in organic and/or inorganic forms at the following rates: 0/45, 0/120, 0/240, 120/120, and 240/0 kg ha^<-1> organic/inorganic N. Yield was found to increase with increasing N input, but no significant difference was found in grain yield among 0/240, 240/0 and 120/120 treatments. Organic N application tended to decrease N accumulation and to increase N utilization efficiency. Genes related to N assimilation activity in leaves, such as ZmNR1 and ZmFd-GOGAT1, were unaffected by different N forms. In contrast, genes related to N remobilization activity in leaves, such as ZmGS1.1 and ZmGDH1, were up-regulated, especially in old leaves, by the pure organic N supply treatment (240/0). These data suggest that application of pure organic N likely induces a N-deficiency response in maize plants, with a consequent increase in physiological N utilization efficiency due to up-regulation of key genes involved in N remobilization processes.

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詳細情報 詳細情報について

  • CRID
    1570291227550258560
  • NII論文ID
    110010031434
  • NII書誌ID
    AA00844314
  • ISSN
    00380768
  • 本文言語コード
    en
  • データソース種別
    • CiNii Articles

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