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Plant and Soil

, Volume 366, Issue 1–2, pp 243–259 | Cite as

Biological nitrification inhibition (BNI) activity in sorghum and its characterization

  • G. V. SubbaraoEmail author
  • K. Nakahara
  • T. Ishikawa
  • H. Ono
  • M. Yoshida
  • T. Yoshihashi
  • Yiyong Zhu
  • H. A. K. M. Zakir
  • S. P. Deshpande
  • C. T. Hash
  • K. L. Sahrawat
Regular Article

Abstract

Aims

The ability to suppress soil nitrification through the release of nitrification inhibitors from plant roots is termed ‘biological nitrification inhibition’ (BNI). Here, we aimed at the quantification and characterization of the BNI function in sorghum that includes inhibitor production, their chemical identity, functionality and factors regulating their release.

Methods

Sorghum was grown in solution culture and root exudate was collected using aerated NH4Cl solutions. A bioluminescence assay using recombinant Nitrosomonas europaea was employed to determine the BNI activity. Activity-guided chromatographic fractionation was used to isolate biological nitrification inhibitors (BNIs). The chemical structure was analyzed using NMR and mass spectrometry; pH-stat systems were deployed to analyze the role of rhizosphere pH on BNIs release.

Results

Sorghum roots released two categories of BNIs: hydrophilic- and hydrophobic-BNIs. The release rates for hydrophilic- and hydrophobic- BNIs ranged from 10 to 25 ATU g−1 root dwt. d−1. Addition of hydrophilic BNIs (10 ATU g−1 soil) significantly inhibited soil nitrification (40 % inhibition) during a 30-d incubation test. Two BNI compounds isolated are: sakuranetin (ED80 0.6 μM; isolated from hydrophilic-BNIs fraction) and sorgoleone (ED80 13.0 μM; isolated from hydrophobic-BNIs fraction), which inhibited Nitrosomonas by blocking AMO and HAO enzymatic pathways. The BNIs release required the presence of NH 4 + in the root environment and the stimulatory effect of NH 4 + lasted 24 h. Unlike the hydrophobic-BNIs, the release of hydrophilic-BNIs declined at a rhizosphere pH >5.0; nearly 80 % of hydrophilic-BNI release was suppressed at pH ≥7.0. The released hydrophilic-BNIs were functionally stable within a pH range of 5.0 to 9.0. Sakuranetin showed a stronger inhibitory activity (ED50 0.2 μM) than methyl 3-(4-hydroxyphenyl) propionate (MHPP) (ED50 100 μM) (isolated from hydrophilic-BNIs fraction) in the in vitro culture-bioassay, but the activity was non-functional and ineffective in the soil-assay.

Conclusions

There is an urgent need to identify sorghum genetic stocks with high potential to release functional-BNIs for suppressing nitrification and to improve nitrogen use efficiency in sorghum-based production systems.

Keywords

Activity-guided isolation Ammonia monooxygenase (AMO) Biological nitrification inhibition (BNI) BNI compounds HAO (hydroxylamine oxidoreductase) Hydrophilic and hydrophobic nitrification inhibitors Sakuranetin Sorghum Sorgoleone 

Notes

Acknowledgments

We acknowledge the technical assistance of Ms. N. Kudo and Ms. Notazawa in the conduct of various experiments described in this manuscript. We acknowledge the cooperation and funding support from Natural Science Foundation of China (NSFC 31172035) to one of the co-authors Yiyong Zhu. We thank Dr. Wade Berry, Univ. of California, LA, USA who read an earlier version of this manuscript and offered suggestions to help with the interpretation of results presented.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • G. V. Subbarao
    • 1
    Email author
  • K. Nakahara
    • 1
  • T. Ishikawa
    • 1
  • H. Ono
    • 2
  • M. Yoshida
    • 2
  • T. Yoshihashi
    • 1
  • Yiyong Zhu
    • 3
  • H. A. K. M. Zakir
    • 4
  • S. P. Deshpande
    • 5
  • C. T. Hash
    • 5
  • K. L. Sahrawat
    • 5
  1. 1.Crop, Livestock and Environment Division, Japan International Research Center for Agricultural Sciences (JIRCAS)TsukubaJapan
  2. 2.National Food Research Institute, National Agriculture and Food Research OrganizationTsukubaJapan
  3. 3.Department of Plant Nutrition, College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjingChina
  4. 4.Department of Crop BotanyBangladesh Agricultural UniversityMymensinghBangladesh
  5. 5.International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)HyderabadIndia

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