We are part of the Cluster of Excellence on Plant Sciences (CEPLAS) contributing to Research areas 1 and 2. Within CEPLAS we use our expertise in plant nutrition and metabolism and genome wide association mapping to address the interaction of rhizosphere microorganisms with plants and their contribution to plant nutrition. We also study the differences in mineral nutrition in closely related C3 and C4 plants. The group has a long standing expertise in dissecting the control of sulfur metabolism.