AUTHOR=Nardi Serenella , Schiavon Michela , Muscolo Adele , Pizzeghello Diego , Ertani Andrea , Canellas Luciano Pasqualoto , Garcia-Mina Jose M. TITLE=Editorial: Molecular Characterization of Humic Substances and Regulatory Processes Activated in Plants JOURNAL=Frontiers in Plant Science VOLUME=13 YEAR=2022 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2022.851451 DOI=10.3389/fpls.2022.851451 ISSN=1664-462X