Root nitrogen acquisition and assimilation / A.J. Miller and M.D. Cramer -- Phosphate acquisition / K.G. Raghothama and A.S. Karthikeyan -- Root-based N2-fixing symbioses: legumes, actinorhizal plants, Parasponia sp. and cycads / J.K. Vessey, K. Pawlowski and B. Bergman -- Mycorrhizas: Gene to function / J.H. Graham and R.M. Miller -- Cluster roots: A curiosity in context / M.W. Shane and H. Lambers -- The roots of carnivorous plants / W. Adlassnig, M. Peroutka, H. Lambers and I.K. Lichtscheidl -- Roles of aquaporins in root responses to irrigation / R. Vandeleur, C. Niemietz, J. Tilbrook and S.D. Tyerman -- Mechanisms of plant resistance to metal and metalloid ions and potential biotechnological applications / A.A. Meharg -- The physiology, genetics and molecular biology of plant aluminum resistance and toxicity / L.V. Kochian, M.A. Pieros and O.A. Hoekenga -- Acclimation to soil flooding -- sensing and signal-transduction / E.J.W. Visser and L.A.C.J. Voesenek -- Root defense responses to fungal pathogens: A molecular perspective / P.A. Okubara and T.C. Paulitz -- Soil microorganisms: an important determinant of allelopathic activity / Inderjit -- Facilitative root interactions in intercrops / H. Hauggaard-Nielsen and E.S. Jensen -- Root-to-shoot signalling: assessing the roles of up' in the up and down world of long-distance signaling in planta / I.C. Dodd.