University of California, Davis - Department of Plant Biology, University of Amsterdam - Plant Hormone Biology Group, Netherlands Institute of Ecology (NIOO-KNAW) - Department of Microbial Ecology, University of California, Davis - Department of Plant Biology, University of Amsterdam - Plant Hormone Biology Group, University of California, Davis - Department of Plant Biology, Netherlands Institute of Ecology (NIOO-KNAW) - Department of Microbial Ecology, University of California, Davis - Department of Plant Biology, University of Georgia - Department of Plant Biology, Netherlands Institute of Ecology (NIOO-KNAW) - Department of Microbial Ecology, University of California, Davis - Department of Plant Biology, University of California, Davis - Department of Plant Biology, Netherlands Institute of Ecology (NIOO-KNAW) - Department of Microbial Ecology, Ethiopian Institute of Agricultural Research, Netherlands Institute of Ecology (NIOO-KNAW) - Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW) - Department of Microbial Ecology, University of Amsterdam - Plant Hormone Biology Group and University of California, Davis - Department of Plant Biology and Genome Center