Back to Search
Start Over
High-sorgoleone producing sorghum genetic stocks suppress soil nitrification and N2O emissions better than low-sorgoleone producing genetic stocks.
- Source :
- Plant & Soil; Aug2022, Vol. 477 Issue 1/2, p793-805, 13p, 4 Charts, 4 Graphs
- Publication Year :
- 2022
-
Abstract
- Purpose: Rapid nitrification leads to loss of nitrogen (N) fertilizer in agricultural systems. Plant produced/derived biological nitrification inhibitors (BNIs) are an effective eco-strategy to rein-in soil nitrification to improve crop-N uptake and nitrogen use efficiency (NUE) in production systems. Sorgoleone is the major component of hydrophobic-BNI-activity in sorghum roots. However, the role of genetic differences in sorgoleone production in reducing soil nitrification and N<subscript>2</subscript>O emissions are not established. Methods: Two genetic-stocks of sorghum with high-sorgoleone (HS), and two with low-sorgoleone (LS) production from roots were grown using hydroponics in a plant-growth chamber, in soil in pots in a glasshouse, and in a field experiment. Release of hydrophilic-BNI activity from roots of HS and LS genetic stocks, sorgoleone levels in rhizosphere soils, soil nitrification rates, soil-nitrifier activity and N<subscript>2</subscript>O emissions were measured to understand the interplay involving sorgoleone release, hydrophilic-BNI release from roots, soil nitrification, plant growth and N uptake. Results: HS-producing genetic-stocks showed higher hydrophilic-BNI-capacity compared to LS- producing genetic-stocks. Biomass production and N uptake were significantly higher in HS than in LS genetic-stocks. Glasshouse and field studies suggest that HS genetic stocks had stronger suppressive impact on soil-nitrifier-populations (ammonia-oxidizing archaea and ammonia-oxidizing bacteria), soil-nitrification, and soil-N<subscript>2</subscript>O emissions than in LS genetic-stocks. Conclusion: These results demonstrate that HS sorghum genetic-stocks suppress soil nitrifier activity and can potentially reduce N losses from NO<subscript>3 </subscript><superscript>− </superscript>leaching and N<subscript>2</subscript>O emissions more effectively than LS genetic-stocks. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 477
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 159103606
- Full Text :
- https://doi.org/10.1007/s11104-022-05474-6