AUTHOR=Ke Meng , Zheng Yuyu , Zhu Ziqiang TITLE=Rethinking the Origin of Auxin Biosynthesis in Plants JOURNAL=Frontiers in Plant Science VOLUME=Volume 6 - 2015 YEAR=2015 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2015.01093 DOI=10.3389/fpls.2015.01093 ISSN=1664-462X