Phosphate excess increases susceptibility to pathogen infection in rice
Campos-Soriano, Lidia (Centre de Recerca en Agrigenòmica)
Bundó Barberà, Mireia (Centre de Recerca en Agrigenòmica)
Bach-Pages, Marcel (Centre de Recerca en Agrigenòmica)
Chiang, Su-Fen. (Academia Sinica. Agricultural Biotechnology Research Center)
Chiou, Tzyy-Jen (Academia Sinica. Agricultural Biotechnology Research Center)
San Segundo, Blanca (Centre de Recerca en Agrigenòmica)

Date:	2020
Abstract:	Phosphorus (P) is an essential nutrient for plant growth and productivity. Due to soil fixation, however, phosphorus availability in soil is rarely sufficient to sustain high crop yields. The overuse of fertilizers to circumvent the limited bioavailability of phosphate (Pi) has led to a scenario of excessive soil P in agricultural soils. Whereas adaptive responses to Pi deficiency have been deeply studied, less is known about how plants adapt to Pi excess and how Pi excess might affect disease resistance. We show that high Pi fertilization, and subsequent Pi accumulation, enhances susceptibility to infection by the fungal pathogen Magnaporthe oryzae in rice. This fungus is the causal agent of the blast disease, one of the most damaging diseases of cultivated rice worldwide. Equally, MIR399f overexpression causes an increase in Pi content in rice leaves, which results in enhanced susceptibility to M. oryzae. During pathogen infection, a weaker activation of defence-related genes occurs in rice plants over-accumulating Pi in leaves, which is in agreement with the phenotype of blast susceptibility observed in these plants. These data support that Pi, when in excess, compromises defence mechanisms in rice while demonstrating that miR399 functions as a negative regulator of rice immunity. The two signalling pathways, Pi signalling and defence signalling, must operate in a coordinated manner in controlling disease resistance. This information provides a basis to understand the molecular mechanisms involved in immunity in rice plants under high Pi fertilization, an aspect that should be considered in management of the rice blast disease.
Grants:	Ministerio de Ciencia e Innovación RTI2018-101275-B-100 Ministerio de Ciencia e Innovación BIO2015-67212-R Ministerio de Economía y Competitividad SEV-2015-0533
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Molecular plant pathology, Vol. 21, Issue 4 (April 2020) , p. 555-570, ISSN 1364-3703

DOI: 10.1111/mpp.12916
PMID: 32072745

16 p, 1.8 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CRAG (Centre for Research in Agricultural Genomics)
Articles > Research articles
Articles > Published articles