Biological Nitrification Inhibition by Australian Tussock Grass and Its Impact on the Rhizosphere Ammonia-Oxidizing Microbiome
Certain plant species have developed the ability to express biological nitrification inhibition (BNI), suppressing the activity of nitrifying microbes and thereby reducing the conversion of ammonium to nitrate. This study assessed the BNI capacity and the rhizosphere ammonia-oxidizing microbiome of...
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2024-11-01
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| author | Yi Zhou Ruey Toh Nasir Iqbal Maarten Ryder Jishun Li Matthew D. Denton |
| author_facet | Yi Zhou Ruey Toh Nasir Iqbal Maarten Ryder Jishun Li Matthew D. Denton |
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| description | Certain plant species have developed the ability to express biological nitrification inhibition (BNI), suppressing the activity of nitrifying microbes and thereby reducing the conversion of ammonium to nitrate. This study assessed the BNI capacity and the rhizosphere ammonia-oxidizing microbiome of two grass species: the endemic Australian Barley Mitchell grass (<i>Astrebla pectinata</i>) and the introduced koronivia grass (<i>Urochloa humidicola</i>), using soils from both agricultural land and native vegetation. In agricultural soil, koronivia grass exhibited significantly higher BNI capacity compared with Barley Mitchell grass. However, in native soil, this trend was reversed, with Barley Mitchell grass demonstrating a significantly greater BNI capacity than koronivia grass (52% vs. 38%). Koronivia grass significantly altered the composition of the ammonia-oxidizing bacteria community in its rhizosphere, leading to a decrease in the Shannon index and bacteria number. Conversely, Barley Mitchell grass reduced the Shannon index (1.2 vs. 1.7) and population size (3.28 × 10<sup>7</sup> vs. 7.43 × 10<sup>7</sup> gene copy number g<sup>−1</sup> dry soil) of the ammonia-oxidizing archaea community in its rhizosphere to a greater extent. These findings suggest that Australian Barley Mitchell grass may have evolved mechanisms to suppress soil archaeal nitrifiers, thereby enhancing its BNI capacity and adapting to Australia’s nutrient-poor soils. |
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| institution | Kabale University |
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| language | English |
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| spelling | doaj-art-f34bec0bba4f4b78986d5777292e947f2024-12-27T14:28:32ZengMDPI AGGrasses2813-34632024-11-013429730610.3390/grasses3040022Biological Nitrification Inhibition by Australian Tussock Grass and Its Impact on the Rhizosphere Ammonia-Oxidizing MicrobiomeYi Zhou0Ruey Toh1Nasir Iqbal2Maarten Ryder3Jishun Li4Matthew D. Denton5School of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA 5064, AustraliaSchool of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA 5064, AustraliaSchool of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA 5064, AustraliaSchool of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA 5064, AustraliaEcology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, ChinaSchool of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA 5064, AustraliaCertain plant species have developed the ability to express biological nitrification inhibition (BNI), suppressing the activity of nitrifying microbes and thereby reducing the conversion of ammonium to nitrate. This study assessed the BNI capacity and the rhizosphere ammonia-oxidizing microbiome of two grass species: the endemic Australian Barley Mitchell grass (<i>Astrebla pectinata</i>) and the introduced koronivia grass (<i>Urochloa humidicola</i>), using soils from both agricultural land and native vegetation. In agricultural soil, koronivia grass exhibited significantly higher BNI capacity compared with Barley Mitchell grass. However, in native soil, this trend was reversed, with Barley Mitchell grass demonstrating a significantly greater BNI capacity than koronivia grass (52% vs. 38%). Koronivia grass significantly altered the composition of the ammonia-oxidizing bacteria community in its rhizosphere, leading to a decrease in the Shannon index and bacteria number. Conversely, Barley Mitchell grass reduced the Shannon index (1.2 vs. 1.7) and population size (3.28 × 10<sup>7</sup> vs. 7.43 × 10<sup>7</sup> gene copy number g<sup>−1</sup> dry soil) of the ammonia-oxidizing archaea community in its rhizosphere to a greater extent. These findings suggest that Australian Barley Mitchell grass may have evolved mechanisms to suppress soil archaeal nitrifiers, thereby enhancing its BNI capacity and adapting to Australia’s nutrient-poor soils.https://www.mdpi.com/2813-3463/3/4/22microbiotaC4endospheregrasslandforage |
| spellingShingle | Yi Zhou Ruey Toh Nasir Iqbal Maarten Ryder Jishun Li Matthew D. Denton Biological Nitrification Inhibition by Australian Tussock Grass and Its Impact on the Rhizosphere Ammonia-Oxidizing Microbiome Grasses microbiota C4 endosphere grassland forage |
| title | Biological Nitrification Inhibition by Australian Tussock Grass and Its Impact on the Rhizosphere Ammonia-Oxidizing Microbiome |
| title_full | Biological Nitrification Inhibition by Australian Tussock Grass and Its Impact on the Rhizosphere Ammonia-Oxidizing Microbiome |
| title_fullStr | Biological Nitrification Inhibition by Australian Tussock Grass and Its Impact on the Rhizosphere Ammonia-Oxidizing Microbiome |
| title_full_unstemmed | Biological Nitrification Inhibition by Australian Tussock Grass and Its Impact on the Rhizosphere Ammonia-Oxidizing Microbiome |
| title_short | Biological Nitrification Inhibition by Australian Tussock Grass and Its Impact on the Rhizosphere Ammonia-Oxidizing Microbiome |
| title_sort | biological nitrification inhibition by australian tussock grass and its impact on the rhizosphere ammonia oxidizing microbiome |
| topic | microbiota C4 endosphere grassland forage |
| url | https://www.mdpi.com/2813-3463/3/4/22 |
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