Evidence for biological nitrification inhibition in Brachiaria pastures

Vista sencilla de ítem
dc.creatorSubbaraoa, Guntur V.
dc.creatorNakahara, K.
dc.creatorHurtado, M.P.
dc.creatorOno, H
dc.creatorMoreta Mejia, DE
dc.creatorSalcedo, A.F.
dc.creatorYoshihashi, AT
dc.creatorIshikawa, T.
dc.creatorIshitani, Manabu
dc.creatorOhnishi, M
dc.creatorYoshida, M
dc.creatorRondón, Marco Antonio
dc.creatorRao, Idupulapati M.
dc.creatorLascano Aguilar, Carlos Eduardo
dc.creatorBerry, W.L.
dc.creatorIto, O.
dc.date2009-10-13
dc.date2014-09-24T07:58:38Z
dc.date2014-09-24T07:58:38Z
dc.date.accessioned2026-06-27T14:37:25Z
dc.descriptionNitrification, a key process in the global nitrogen cycle that generates nitrate through microbial activity, may enhance losses of fertilizer nitrogen by leaching and denitrification. Certain plants can suppress soil-nitrification by releasing inhibitors from roots, a phenomenon termed biological nitrification inhibition (BNI). Here, we report the discovery of an effective nitrification inhibitor in the root-exudates of the tropical forage grass Brachiaria humidicola (Rendle) Schweick. Named ‘‘brachialactone,’’ this inhibitor is a recently discovered cyclic diterpene with a unique 5-8-5-membered ring system and a -lactone ring. It contributed 60–90% of the inhibitory activity released from the roots of this tropical grass. Unlike nitrapyrin (a synthetic nitrification inhibitor), which affects only the ammonia monooxygenase (AMO) pathway, brachialactone appears to block both AMO and hydroxylamine oxidoreductase enzymatic pathways in Nitrosomonas. Release of this inhibitor is a regulated plant function, triggered and sustained by the availability of ammonium (NH4 ) in the root environment. Brachialactone release is restricted to those roots that are directly exposed to NH4 . Within 3 years of establishment, Brachiaria pastures have suppressed soil nitrifier populations (determined as amoA genes; ammonia-oxidizing bacteria and ammonia-oxidizing archaea), along with nitrification and nitrous oxide emissions. These findings provide direct evidence for the existence and active regulation of a nitrification inhibitor (or inhibitors) release from tropical pasture root systems. Exploiting the BNI function could become a powerful strategy toward the development of low-nitrifying agronomic systems, benefiting both agriculture and the environment.
dc.identifierhttps://hdl.handle.net/10568/42836
dc.identifier.urihttp://hdl.handle.net/123456789/83537
dc.languageen
dc.publisherNational Academy of Sciences
dc.rightsOpen Access
dc.sourceSubbaraoa, Guntur V.; Nakahara, K.; Hurtado, MP; Ono, H; Moreta Mejia, DE; Salcedo, AF; Yoshihashi, AT; Ishikawa, T; Ishitani, Manabu; Ohnishi, M; Yoshida, M; Rondón, M.A.; Rao, Idupulapati M.; Lascano, Carlos E.; Berry, W.L.; Ito, O (2009). Evidence for biological nitrification inhibition in Brachiaria pastures. PNAS 106(41):17302-17307.
dc.subjectfeed crops
dc.subjectbrachiaria humidicola
dc.subjectclimate change
dc.subjectnitrous oxide
dc.subjectnitrification
dc.subjectnitrification inhibitors
dc.subjectnitrogen cycle
dc.subjectpastures
dc.subjectcambio climático
dc.subjectoxido nitroso
dc.subjectnitrificación
dc.subjectinhibidores de la nitrificacion
dc.subjectciclo del nitrógeno
dc.subjectpastizales
dc.titleEvidence for biological nitrification inhibition in Brachiaria pastures
dc.typeJournal Article

Archivos

Colecciones

Centro Internacional de Agricultura Tropical (CIAT)