Biological nitrification inhibition by rice root exudates in two different soils of Uruguay

Illarze, Gabriela; Arango, Jacobo; Núñez, Jonathan; Irisarri, Pilar

doi:10.1080/09064710.2021.1948602

Cited by 4 publications

(5 citation statements)

References 76 publications

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“…A wide range of BNI efficiency was demonstrated among different plant cultivars within the same species, for rice ( Chen et al, 2022;Illarze et al, 2021;Li et al, 2007;Tanaka et al, 2010;Sun et al, 2016; this study) and in other crops, such as pearlmillet (Ghatak et al, 2022), maize (Mwafulirwa et al, 2021), koronivia grass (Vázquez et al, 2020) and sorghum (Gao et al, 2022). We hypothesised that the differential BNI efficiency of different rice genotypes is mediated by their root exudation rate and chemical composition (H2).…”

Section: Influence Of Plant Physiology On Bni Efficiencymentioning

confidence: 69%

“…This variability was explained by a range of BNI efficiency in 36 rice genotypes through testing growth inhibition of N. europaea AOB by the rice root exudates (Tanaka et al, 2010). BNI efficiency of some rice cultivars was not only demonstrated in hydroponic conditions but also a range of soils (Chen et al, 2022;Lu et al, 2022;Illarze et al, 2021;Sun et al, 2016). Two structurally different BNI compounds, a fatty alcohol, 1,9decanediol (Sun et al, 2016) and a phenolic compound, syringic acid (Lu et al, 2022), have been isolated from rice root exudates, even showing some synergetic effects (Lu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Rice biological nitrification inhibition efficiency depends on plant genotype exudation rate

Kaur-Bhambra

Rajakulendran²,

Bodington

et al. 2023

Preprint

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Nitrification largely contributes to global nitrogen (N) fertiliser loss and nitrous oxide emissions in agricultural soils, including rice cultivation, Asia's largest fertiliser consumer. One promising mitigation strategy to achieve greener agriculture involves biological nitrification inhibition (BNI) by plant-derived compounds. Future implementation of this nature-based approach in agricultural settings requires a better understanding of the impact of plant physiological traits on BNI efficiency and nitrification dynamics. We targeted those objectives in five rice genotypes grown in greenhouse conditions. The BNI efficiency was variable among the five plant genotypes, with a stronger inhibition of the ammonia-oxidiser in the rhizosphere than in the bulk soil. We identified that the root mass, root exudation rate and chemical composition are factors explaining the distinct BNI efficiencies in the rice genotypes, with plants having a high BNI efficiency having a small root mass and a high root exudation rate. Using the BNI efficiency assay of root exudates on multiple AO cultures, we demonstrated that AO bioassay could accurately represent the BNI variability in the soil. Finally, we identified a novel BNI compound, N-butyldodecane-1-amine (NBDA), in two high-BNI genotypes. NBDA specifically inhibited ammonia oxidisers by inhibiting enzymes involved in the ammonia oxidation pathway. These findings demonstrate that BNI research integrating plant physiology, microbial ecology, and chemistry has a strong potential for providing more sustainable agriculture.

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Section: Influence Of Plant Physiology On Bni Efficiencymentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Rice biological nitrification inhibition efficiency depends on plant genotype exudation rate

Kaur-Bhambra

Rajakulendran²,

Bodington

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Isolating the effects of biologically active compounds on the activity of nitri ers from other possible nitri cation-suppressing mechanisms is challenging ( Verhagen et al 1994;Nardi et al 2013;Subbarao et al 2015;Illarze et al, 2021). In addition to BNI, nitri cation in the rhizosphere can be suppressed by plants and other microorganisms via competing for NH 4 + , and by favoring fast-growing heterotrophs in the rhizosphere that outcompete slow-growing nitri ers (Ishikawa et al 2003;Nardi et al 2013;Verhagen et al 1994).…”

Section: Discussionmentioning

confidence: 99%

Does subjecting plants to water stress enhance biological nitrification inhibition potential of rice?

2023

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Background and aims:Biological nitri cation inhibition (BNI) is a trait that could improve nitrogen-use e ciency of a crop. We studied varietal differences in BNI potential of rice at the vegetative phase when plants were subjected to water stress. MethodsWe obtained water-soluble root exudates (RE) and water-extracts of crushed roots (RT) from two week-old seedlings of ve rice varieties grown continuously under adequate water or under water stress and assessed their ability to suppress the activity of Nitrosomonas europaea and the growth of lettuce seedlings. We also investigated how growing rice under continuously saturated (T C ) and unsaturated (T U ) soil moisture conditions affected potential nitri cation rate (PNR) and the community structure of ammonia-oxidizing archaea and bacteria (AOA and AOB, respectively) in the rhizosphere compared with the bulk soil. ResultsWe observed that only RT at ≥ 0.50 mg ml − 1 suppressed the activity of N. europaea with signi cant (p < 0.05) differences among rice varieties. Subjecting rice varieties PI312777 and PI338046 to water stress signi cantly (p < 0.05) increased BNI of RT. Inhibition of lettuce root growth by RT was strongly correlated with its BNI (r = 0.83, p < 0.05). As revealed in T-RFLP pro les, varietal effects on AOA and AOB varied with moisture management. AOB were more responsive to soil moisture conditions than AOA. ConclusionsThe rice varieties studied produced compounds that could inhibit ammonia oxidizers, but the degree of BNI differed based on moisture stress faced by the crop. Lineages of rice varieties with known allelopathic potential would be promising candidates in a search for BNI potential.

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Section: Discussionmentioning

confidence: 99%

Does subjecting plants to water stress enhance biological nitrification inhibition potential of rice?

Dandeniya

Thies²,

DiTommaso³

2022

Preprint

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Background and aims: Biological nitrification inhibition (BNI) is a trait that could improve nitrogen-use efficiency of a crop. We studied varietal differences in BNI potential of rice at the vegetative phase when plants were subjected to water stress. Methods We obtained water-soluble root exudates (RE) and water-extracts of crushed roots (RT) from two week-old seedlings of five rice varieties grown continuously under adequate water or under water stress and assessed their ability to suppress the activity of Nitrosomonas europaea and the growth of lettuce seedlings. We also investigated how growing rice under continuously saturated (TC) and unsaturated (TU) soil moisture conditions affected potential nitrification rate (PNR) and the community structure of ammonia-oxidizing archaea and bacteria (AOA and AOB, respectively) in the rhizosphere compared with the bulk soil. Results We observed that only RT at ≥ 0.50 mg ml− 1suppressed the activity of N. europaea with significant (p < 0.05) differences among rice varieties. Subjecting rice varieties PI312777 and PI338046 to water stress significantly (p < 0.05) increased BNI of RT. Inhibition of lettuce root growth by RT was strongly correlated with its BNI (r = 0.83, p < 0.05). As revealed in T-RFLP profiles, varietal effects on AOA and AOB varied with moisture management. AOB were more responsive to soil moisture conditions than AOA. Conclusions The rice varieties studied produced compounds that could inhibit ammonia oxidizers, but the degree of BNI differed based on moisture stress faced by the crop. Lineages of rice varieties with known allelopathic potential would be promising candidates in a search for BNI potential.

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Biological nitrification inhibition by rice root exudates in two different soils of Uruguay

Cited by 4 publications

References 76 publications

Rice biological nitrification inhibition efficiency depends on plant genotype exudation rate

Rice biological nitrification inhibition efficiency depends on plant genotype exudation rate

Does subjecting plants to water stress enhance biological nitrification inhibition potential of rice?

Does subjecting plants to water stress enhance biological nitrification inhibition potential of rice?

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