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Nitrate has a stronger rhizobacterial-based effect on rice growth and nitrogen use than ammonium in acidic paddy soil.
- Source :
- Plant & Soil; Jun2023, Vol. 487 Issue 1/2, p605-621, 17p, 1 Chart, 6 Graphs
- Publication Year :
- 2023
-
Abstract
- Background and Aims: Suitable N source supply is critical to improve plant growth and N uptake, but the importance of nitrate (NO<subscript>3</subscript><superscript>−</superscript>) for rice (Oryza sativa L.) and microbiota is often neglected in acidic paddy soils where ammonium (NH<subscript>4</subscript><superscript>+</superscript>) is dominant. This study aimed to explore the differential effects of NH<subscript>4</subscript><superscript>+</superscript> and NO<subscript>3</subscript><superscript>−</superscript> on rice growth, fertilizer nitrogen recovery efficiency (FNRE), and rhizosphere bacterial community in acid soil. Methods: Two rice varieties, Kasalath (Al-sensitive indica) and Koshihikari (Al-tolerant japonica), were exposed to different N sources with or without lime in an acid soil. Results: Liming and NO<subscript>3</subscript><superscript>−</superscript> application solely improved the growth and FNRE of the Al-sensitive rice, namely, by increasing soil pH and alleviating Al toxicity. Compared with liming and rice variety, N source had a more pronounced influence on rhizobacterial community composition. Of the two sources, NO<subscript>3</subscript><superscript>−</superscript> had a stronger effect on the rhizobacterial community than NH<subscript>4</subscript><superscript>+</superscript>. Remarkably, rice plants fed with NH<subscript>4</subscript><superscript>+</superscript> specifically recruited Desulfosporosinus and Desulfitobacterium associated with ferric NH<subscript>4</subscript><superscript>+</superscript> oxidation in the rhizosphere, whereas those exposed to NO<subscript>3</subscript><superscript>−</superscript> recruited Alicyclobacillus with NO<subscript>3</subscript><superscript>−</superscript>-reducing iron oxidation ability. Three keystone taxa were identified in a rhizobacterial co-occurrence network analysis: Alicyclobacillus, which was positively associated with rice growth and FNRE, and Acidobacteriales and WPS-2, both with negative associations. Conclusion: Compared with NH<subscript>4</subscript><superscript>+</superscript>, NO<subscript>3</subscript><superscript>−</superscript> enhances the growth and FNRE of Al-sensitive rice and exerts dominant effects on the rhizobacterial community, which indicates the importance of NO<subscript>3</subscript><superscript>−</superscript> for rice and has instructive implications for N management in acid soil. [ABSTRACT FROM AUTHOR]
- Subjects :
- RICE
ACID soils
LIMING of soils
IRON oxidation
SOIL acidity
AMMONIUM
COMMUNITIES
Subjects
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 487
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 164356289
- Full Text :
- https://doi.org/10.1007/s11104-023-05957-0