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Arabidopsis responds to volatile compounds emitted by the fungal pathogen alternaria alternata by triggering plastidic phosphoglucose isomerase-independent mechanisms

AuthorsMuñoz Pérez, Francisco José CSIC ORCID ; Sánchez-López, Ángela María CSIC ORCID ; Bahaji, Abdellatif CSIC ORCID ; Diego, Nuria de; Baslam, Marouane CSIC ORCID; Almagro, Goizeder CSIC ORCID ; Ricarte-Bermejo, Adriana CSIC ; Spíchal, Lukáš; Doležal, Karel; Ciordia, Sergio; Baroja-Fernández, Edurne CSIC ORCID CVN ; Pozueta Romero, Javier CSIC ORCID
Issue Date26-Jun-2017
CitationXXII Reunión de la Sociedad Española de Fisiología Vegetal (2017)
XV Spanish Portuguese Congress of Plant Physiology (2017)
AbstractVolatile compounds (VCs) emitted by phylogenetically diverse microorganisms (including plant pathogens and microbes that do not normally interact mutualistically with plants) promote photosynthesis, growth and the accumulation of high levels of starch in leaves through cytokinin (CK) regulated processes. In the Arabidopsis plants not exposed to VCs, plastidic phosphoglucose isomerase (pPGI) acts as an important determinant of photosynthesis and growth, likely as a consequence of its involvement in the synthesis of plastidic CKs in roots. Moreover, this enzyme plays an important role in connecting the Calvin Benson cycle with the starch biosynthetic pathway in leaves. To elucidate the mechanisms involved in the responses of plants to microbial VCs, and to investigate the extent of pPGI involvement, we characterized pPGI null pgi1-2 Arabidopsis plants cultured in the presence or absence of VCs emitted by Alternaria alternata. We found that volatile emissions from this fungal phytopathogen promote growth, photosynthesis and the accumulation of plastidic CKs in pgi1-2 leaves. Notably, the mesophyll cells of pgi1- 2 leaves accumulated exceptionally high levels of starch following VC exposure. Proteomic analyses revealed that VCs promote global changes in the expression of proteins involved in photosynthesis, starch metabolism and growth that can account for the observed responses in pgi1-2 plants. The overall data show that Arabidopsis plants can respond to VCs emitted by phytopathogenic microorganisms by triggering pPGI-independent mechanisms.
DescriptionTrabajo presentado en la XXII Reunión de la Sociedad Española de Fisiología Vegetal / XV Spanish Portuguese Congress of Plant Physiology, celebrada en Barcelona (España), del 26 al 29 de junio de 2017
Appears in Collections:(IDAB) Comunicaciones congresos
(CNB) Comunicaciones congresos

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