• Baier M., Gimmler H. & Hartung W. (1990) Permeability of guard cell plasmamembrane and tonoplast. Journal of Experimental Botany 41, 351358.
  • Bano A., Dörffling K., Bettin D. & Hahn H. (1993) Abscisic acid and cytokinins as possible root-to-shoot signals in xylem sap of rice plants in drying soil. Australian Journal of Plant Physiology 20, 109115.
  • Bano A., Hansen H., Dörffling K. & Hahn H. (1994) Changes in the content of free and conjugated abscisic acid, phaseic acid and cytokinins in the xylem sap of drought stressed sunflower plants. Phytochemistry 37, 345347.
  • Daeter W., Slovik S. & Hartung W. (1993) The pH-gradients in the root system and the abscisic acid concentration in the xylem- and apoplastic saps. Philosophical Transactions of the Royal Society, London, Series B 341, 4956.
  • Dathe W., Sembdner G., Yamaguchi I. & Takahashi N. (1982) Gibberellins and growth inhibitors in spring bleeding sap, roots and branches of Juglans regia L. Plant and Cell Physiology 23, 115123.
  • Dietz K.J., Wichert K., Sauter A., Messdaghi D. & Hartung W. (2000) Characterisation of an extracellular β-glucosidase in barley involved in the hydrolysis of ABA glucose conjugate in leaves. Journal of Experimental Botany 51, 937944.
  • Fort C.F., Muller F., Label P., Granier A. & Dreyer E. (1998) Stomatal conductance, growth and root signaling in Betula pendula seedlings subjected to partial soil drying. Tree Physiology 18, 769776.
  • Freundl E., Steudle E. & Hartung W. (1998) Water uptake by roots of maize and sunflower affects the radial transport of abscisic acid and its concentration in the xylem. Planta 207, 819.DOI: 10.1007/s004250050450
  • Freundl E., Steudle E. & Hartung W. (2000) Apoplastic transport of abscisic acid through roots of maize: effect of the exodermis. Planta 210, 222231.
  • Fußeder A., Wartinger A., Hartung W., Schulze E.-D. & Heilmeier H. (1992) Cytokinins in the xylem sap of desert-grown almond (Prunus dulcis) trees: daily courses and their possible interactions with abscisic acid and leaf conductance. New Phytologist 122, 4552.
  • Hansen H. & Dörffling K. (1999) Changes of free and conjugated abscisic acid and phaseic acid in xylem sap of drought-stressed sunflower plants. Journal of Experimental Botany 50, 15991605.DOI: 10.1093/jexbot/50.339.1599
  • Hartung W. & Jeschke W.D. (1999) Abscisic acid – a long distance stress signal in salt stressed plants. In Plant Responses to Enviromental Stresses: from Phytohormone to Genome Reorganisation (ed. H.R. Lerner), pp. 333348. Marcel Dekker, New York.
  • Hartung W., Peuke A.D. & Davies W.J. (1999) Abscisic acid – a hormonal long distance stress signal in plants under drought and salt stress. In Handbook of Plant and Crop Stress (ed. M. Pessarakli), pp. 731747. Marcel Dekker, New York.
  • Holden D.W. & Rohringer R. (1985) Peroxidases and glycosidases in intercellular fluids from non-inoculated abd rust-affected wheat leaves. Plant Physiology 79, 820824.
  • Jeschke W.D. & Hartung W. (2000) Root–shoot interaction in mineral nutrition. Plant & Soil 226, 5769.
  • Jeschke W.D., Peuke A.D., Pate J.S. & Hartung W. (1997a) Transport, synthesis and catabolism of abscisic acid (ABA) in intact plants of castor bean (Ricinus communis L.) under phosphate deficiency and moderate salinity. Journal of Experimental Botany 48, 17371747.
  • Jeschke W.D., Holobrada M. & Hartung W. (1997b) Growth of Zea mays L. plants with their seminal roots only. Effects on plant development, xylem transport, mineral nutrition and the flow and distribution of abscisic acid (ABA) as a possible shoot to root signal. Journal of Experimental Botany 48, 12291239.
  • Jokhan A.D., Harink R.J. & Jackson M.B. (1999) Concentration and delivery of abscisic acid in xylem sap are greater at the shoot base than at a target leaf nearer to the shoot apex. Plant Biology 1, 253260.
  • Kaiser G., Weiler E.W. & Hartung W. (1985) The intercellular distribution of abscisic acid in mesophyll cells – the role of the vacuole. Journal of Plant Physiology 119, 237245.
  • Kamboj J.S., Blake P.S. & Baker D.A. (1998) Cytokinins in the vascular saps of Ricinus communis. Plant Growth Regulation 25, 123126.DOI: 10.1023/a:1006016023707
  • Munns R. & King R.W. (1988) Abscisic acid is not the only stomatal inhibitor in the transpiration stream of wheat plants. Plant Physiology 88, 703708.
  • Munns R., Passioura J.B., Milborrow B.V., James R.A. & Close T.J. (1993) Stored xylem sap from wheat and barley in drying soil contains an inhibitor with a large molecular size. Plant, Cell and Environment 16, 867872.
  • Sauter A. & Hartung W. (2000) Abscisic conjugates – do they play a role as long distance stress signal in the xylem? Journal of Experimental Botany 51, 929935.DOI: 10.1093/jexbot/51.346.929
  • Sidler M., Hassa P., Hasan S., Ringli C. & Dudler R. (1998) Involvement of an ABC transporter in a developmental pathway regulating hypocotyl cell elongation in the light. Plant Cell 10, 16231636.
  • The Arabidopsis Genome Iniative (2000) Analysis of the genome sequence of the flowering plant Arabidopsis thaliana. Nature 408, 796815.
  • Wilkinson S. & Davies W.J. (1997) Xylem sap pH increase: a drought signal received at the apoplastic face of the guard cell that involves the suppression of saturable abscisic acid uptake by the epidermal symplast. Plant Physiology 113, 559573.