Rhizosphere pH and cation‐anion balance determine the exudation of nitrification inhibitor 3‐epi‐brachialactone suggesting release via secondary transport

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dc.creatorEgenolf, Konrad
dc.creatorVerma, Supriya
dc.creatorSchöne, Jochen
dc.creatorKlaiber, Iris
dc.creatorArango, Jacobo
dc.creatorCadisch, Georg
dc.creatorNeumann, Günter
dc.creatorRasche, Frank
dc.date2021-05
dc.date2021-01-18T13:10:35Z
dc.date2021-01-18T13:10:35Z
dc.date.accessioned2026-06-27T13:21:17Z
dc.descriptionBiological nitrification inhibition (BNI) of Brachiaria humidicola has been attributed to nitrification-inhibiting fusicoccanes, most prominently 3-epi-brachialactone. However, its release mechanism from B. humidicola roots remains elusive. Two hydroponic experiments were performed to investigate the role of rhizosphere pH and nutritional N form in regulating 3-epi-brachialactone release by B. humidicola and verify the underlying release pathway. Low rhizosphere pH and NH4 + nutrition promoted 3-epi-brachialactone exudation. However, the substitution of NH4 + by K+ revealed that the NH4 + effect was not founded in a direct physiological response to the N form but was related to the cation-anion balance during nutrient uptake. Release of 3-epi-brachialactone correlated with the transmembrane proton gradient ΔpH and NH4 + uptake (R2 = 0.92 for high ~6.8 and R2 = 0.84 for low ~4.2 trap solution pH). This corroborated the release of 3-epi-brachialactone through secondary transport, with the proton motive force (ΔP) defining transport rates across the plasma membrane. It was concluded that 3-epi-brachialactone release cannot be conceptualized as a regulated response to soil pH or NH4 + availability, but merely as the result of associated changes in ΔP.
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/110891
dc.identifier.urihttp://hdl.handle.net/123456789/56719
dc.languageen
dc.publisherWiley
dc.rightsOpen Access
dc.sourceEgenolf, K.; Verma, S.; Schöne, J.; Klaiber, I.; Arango, J.; Cadisch, G.; Neumann, G.; Rasche, F. (2020) Rhizosphere pH and cation‐anion balance determine the exudation of nitrification inhibitor 3‐epi‐brachialactone suggesting release via secondary transport. Physiologia Plantarum, Online first paper (06 December 2020). ISSN: 1399-3054.
dc.subjectsoil properties
dc.subjectrhizosphere ph
dc.subjectnitrification inhibitors
dc.subjectbrachiaria humidicola
dc.subjectpropiedades del suelo
dc.subjectph de la rizosfera
dc.subjectinhibidores de la nitrificación
dc.subjectcell biology
dc.subjectgenetics
dc.subjectphysiology
dc.titleRhizosphere pH and cation‐anion balance determine the exudation of nitrification inhibitor 3‐epi‐brachialactone suggesting release via secondary transport
dc.typeJournal Article

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