AUTHOR=Lang Claus , Smith Lucinda S. , Haney Cara H. , Long Sharon R. TITLE=Corrigendum: Characterization of Novel Plant Symbiosis Mutants Using a New Multiple Gene-Expression Reporter Sinorhizobium meliloti Strain JOURNAL=Frontiers in Plant Science VOLUME=9 YEAR=2018 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2018.00848 DOI=10.3389/fpls.2018.00848 ISSN=1664-462X