Exogenous strigolactones impact metabolic profiles and phosphate starvation signalling in roots |
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Authors: | Jordi Gamir Rocío Torres-Vera Carlos Rial Estefanía Berrio Pedro M. de Souza Campos Rosa M. Varela Francisco A. Macías María J. Pozo Victor Flors Juan A. López-Ráez |
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Affiliation: | 1. Group of Mycorrhizas, Department of Soil Microbiology and Symbiotic Systems, Estación Experimental del Zaidín (EEZ-CSIC), Granada, Spain;2. Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus de Excelencia Internacional (CeiA3), School of Science, University of Cádiz, Cádiz, Spain;3. Biochemistry and Plant Biotechnology Laboratory, Department CAMN, Universitat Jaume I, Castellón, Spain |
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Abstract: | Strigolactones (SLs) are important ex-planta signalling molecules in the rhizosphere, promoting the association with beneficial microorganisms, but also affecting plant interactions with harmful organisms. They are also plant hormones in-planta, acting as modulators of plant responses under nutrient-deficient conditions, mainly phosphate (Pi) starvation. In the present work, we investigate the potential role of SLs as regulators of early Pi starvation signalling in plants. A short-term pulse of the synthetic SL analogue 2′-epi-GR24 promoted SL accumulation and the expression of Pi starvation markers in tomato and wheat under Pi deprivation. 2′-epi-GR24 application also increased SL production and the expression of Pi starvation markers under normal Pi conditions, being its effect dependent on the endogenous SL levels. Remarkably, 2′-epi-GR24 also impacted the root metabolic profile under these conditions, promoting the levels of metabolites associated to plant responses to Pi limitation, thus partially mimicking the pattern observed under Pi deprivation. The results suggest an endogenous role for SLs as Pi starvation signals. In agreement with this idea, SL-deficient plants were less sensitive to this stress. Based on the results, we propose that SLs may act as early modulators of plant responses to P starvation. |
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Keywords: | 2′-epi-GR24 metabolism molecular markers Pi starvation plant responses signalling strigolactones |
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