Nitrogen drives plant growth to the detriment of leaf sugar and steviol glycosides metabolisms in Stevia (Stevia rebaudiana Bertoni)

Authors Organisations
  • Yuming Sun(Author)
    Jiangsu Province and Chinese Academy of Science
  • Menglan Hou(Author)
    Jiangsu Province and Chinese Academy of Science
  • Luis Mur(Author)
  • Yongheng Yang(Author)
    Jiangsu Province and Chinese Academy of Science
  • Ting Zhang(Author)
    Jiangsu Province and Chinese Academy of Science
  • Xiaoyang Xu(Author)
    Jiangsu Province and Chinese Academy of Science
  • Suzhen Huang(Author)
    Jiangsu Province and Chinese Academy of Science
  • Haiying Tong(Author)
    Jiangsu Province and Chinese Academy of Science
Type Article
Original languageEnglish
Pages (from-to)240-249
Number of pages10
JournalPlant Physiology and Biochemistry
Volume141
Early online date08 Jun 2019
DOI
Publication statusPublished - 01 Aug 2019
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Abstract

Steviol glycosides (SGs) in Stevia (Stevia rebaudiana Bertoni) leaves are important due to their high sweetness and low calorific value. The yield of SGs is dependent on fertilization regimes, but the relationship between nitrogen (N) administration and SGs synthesis is still unclear. In this study, we investigate the effects of N rates on SGs production through hydroponic and plot experiments. The SGs yield was not significantly changed by N fertilization, but leaf SGs concentrations were significantly reduced due to the “dilution effect”. Additionally, N addition decreased leaf carbon (C)/N ratio and soluble sugar concentration, accompanied with the inhibited phosphoenolpyruvate carboxylase and L-phenylalanine ammonia_lyase activities. A significant positive correlation between leaf SGs concentrations, C/N ratio and soluble sugar concentration was observed. Overall, we suggest that N-driven Stevia growth negatively affects SGs concentrations. The leaf C/N ratio and soluble sugar changes indicated the occurrence of metabolic reprogramming

Keywords

  • Stevia rebaudiana Bertoni, Steviol glycosides, nitrogen, dilution effect, sugar

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  • Nitrogen drives plant growth to the detriment of leaf sugar and steviol glycosides metabolisms in Stevia (Stevia rebaudiana Bertoni)

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