Acknowledgments
We thank Dr. Daniela Pontiggia from Sapienza University of Rome for providing the purified oligogalacturonides. This work was supported by the Spanish Government through the CSIC Intramural project 201840E130, grant RTI2018-094350-B-C31 from the Ministerio de Ciencia, Innovación y Universidades and two Postdoctoral fellowships to J. Gamir, FJCI-2015-23575 from Ministerio de Ciencia, Innovación y Universidades and CDEIGENT/2018/015 from Generalitat Valenciana. None of the major findings of the research described here has been submitted to other journals or described elsewhere.