Planta

, Volume 212, Issue 1, pp 112–118 | Cite as

Calcium chloride penetrates plant cuticles via aqueous pores

  • Jörg Schönherr

Abstract.

Penetration of calcium chloride across astomatous cuticular membranes (CMs) isolated from leaves of Pyrus communis L. has been studied. Penetration was a first-order process when calcium chloride concentrations ranged from 2 g l−1 to 10 g l−1. Rate constants were increased 10-fold by adding wetting agents but they did not depend on temperature. The accelerators tributyl phosphate and diethyl sebacate had no effect on rates of penetration. Increasing humidity over the salt residue on the CMs from 50 to 90% increased rate constants by about 2-fold. Extracting cuticular waxes from pear leaf CMs increased rate constants by factors of 2 to 3, depending on humidity. Leaf CMs from Malus domestica Borkh., Populus alba L., Stephanotis floribunda Brongn. and Schefflera actinophylla (Endl.) Harms were also permeable to CaCl2. Highest rate constants were observed with poplar CMs while Schefflera CMs exhibited the lowest permeability. By comparing these results with the well established transport properties of the lipophilic pathway it is concluded that calcium chloride hexahydrate penetrated cuticular membranes via aqueous pores.

Key words: Calcium chloride (cuticle penetration) Cuticular membrane Foliar nutrition Membrane permeability Pore (aqueous) 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Jörg Schönherr
    • 1
  1. 1.Abteilung Obstbau, Institut für Gemüse- und Obstbau, Universität Hannover, Am Steinberg 3, 31157 Sarstedt, Germany; E-mail: bannetze.schoenherr@t-online.de; Fax: +49-5066-826111DE

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