SUPPLEMENTARY
Root: Root: Evolutionary Origins and Evolutionary Significance
Homeostasis: Phytochelatins Cellular mechanisms of metal tolerance (review)
Membrane transporters: Martinoia 2002 et al. 2002 Dietz et al. 2001 Assmann 2001
Sulfur: Sulfur metabolism Sulfur review Update on sulfur
Phosphorus: Current Opinion in Plant Biology review Trends in Plant Science review