1. Netherlands Institute of Ecology (NIOO-KNAW), Department of Microbial Ecology, 6708 PB Wageningen, Netherlands
2. Department of Biology, Leiden University, 2333 BE Leiden, The Netherlands
3. Department of Agroecology, Maranhão State University, 65055-970 São Luis, Brazil
4. Laboratory of Plant Physiology, Wageningen University, 6700 HB Wageningen, The Netherlands
5. Plant Hormone Biology Group, Swammerdam Institute for Life Sciences, University of Amsterdam (UVA), 1098 XH Amsterdam, The Netherlands