1 23 Plant and Soil An International Journal on Plant-Soil Relationships ISSN 0032-079X Plant Soil DOI 10.1007/s11104-012-1164-0 Root taxa identification in plant mixtures – current techniques and future challenges Boris Rewald, Catharina Meinen, Michael Trockenbrodt, Jhonathan E. Ephrath & Shimon Rachmilevitch