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Bradyrhizobium arachidis mediated enhancement of (oxy)matrine content in the medicinal legume Sophora flavescens

Z. Wu,Xiangjie Meng,Y. Jiao,B. Guo,X. Sui,S. Ma,W. Chen,R. Singh

Published 2021 in Letters in Applied Microbiology

ABSTRACT

Effect of rhizobial inoculation and nitrate application on the content of bioactive compounds in legume plants is an interesting aspect for interactions among microbes, plants and chemical fertilizers, as well as for cultivated practice of legumes. In this study, nitrate (0, 5 and 20 mmol l−1) and Bradyrhizobium arachidis strain CCBAU 051107T were applied, individually or in combination, to the root rhizosphere of the medicinal legume Sophora flavescens Aiton (SFA). Then the plant growth, nodulation and active ingredients including (oxy)matrine of SFA were determined and compared. Rhizobial inoculation alone significantly increased the numbers and fresh weight of root nodules. Nodulation was significantly inhibited due to nitrate (5 and 20 mmol l−1). Only oxymatrine was detected in the control plants without rhizobial inoculation and nitrate supplement, while both oxymatrine and matrine were synthesized in plants treated with inoculation of B. arachidis or supplied with nitrate. The content of oxymatrine was the highest in plants inoculated solely with rhizobia and was not significantly altered by additional application of nitrate. Combinations of B. arachidis inoculation and different concentrations of nitrate did not significantly change the concentrations of (oxy)matrine in the plant. In conclusion, sole rhizobial inoculation was the best approach to increase the contents of key active ingredients oxymatrine and matrine in the medicinal legume SFA.

PUBLICATION RECORD

  • Publication year

    2021

  • Venue

    Letters in Applied Microbiology

  • Publication date

    2021-01-20

  • Fields of study

    Biology, Agricultural and Food Sciences, Chemistry, Environmental Science, Medicine

  • Identifiers
    DOI 10.1111/lam.13453PMID 33474743
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar, PubMed

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