Abstract
Surfactants are frequently used as adjuvants for improving the efficiency of foliar applied fertilizers, pesticides and other biologically active substances. In our paper we used detached leaves of ivy (Hedera helix L.) for the study of the influence of anionic surfactants sodium dodecylsulfate (SDS) and sodium dicyclohexyl sulfosuccinate (DCSS) on zinc and strontium uptake by leaf surface and transport by radiotracer technique with 65ZnCl2 and 85SrCl2. Accumulated amounts of Zn2+ and Sr2+ ions by the surface of detached intact ivy leaves were 5.0 and 1.1 μg/g, respectively. Ivy leaves pretreated for 24 h in 1 mM SDS or DCSS solutions accumulated approx. twice more Zn and five time more Sr than non treated leaves. Pretreatment with surfactants increased mobility of zinc and strontium in leaf tissues. Separate experiments showed that both SDS and DCSS were sorbed onto the leaf tissue reaching equilibrium within several hours of immersing leaf blades to surfactant solutions. The process can be described in terms of partition equilibria P = [C]leaf/[C]solution with log P = 1.396 within surfactant concentration studied Co ≤ 100 μmol/L. The mechanism of action of surfactants on metal ion uptake is discussed.
Highlights
The cuticle is the main interface between plants and their environment
Our paper is a step towards addressing the question of the influence of anionic surfactants sodium dodecylsulfate (SDS) and sodium dicyclohexyl sulfosuccinate (DCSS) on the uptake of Zn and Sr as bivalent metals by the leaf surface of ivy (Hedera helix L.)
For metal uptake experiments leaf blades were immersed in 10 ml 25% HM medium supplemented with 5 μmol/L 65ZnCl2 or 85SrCl2 in dishes covered with plastic lids (Fig. 1.) in cultivation room at 22±2°C illuminated with artificial light (2 000 lx) in 12h/12h light/dark cycle
Summary
The cuticle is the main interface between plants and their environment It covers the epidermis of all aerial primary parts of plant organs as a continuous extracellular matrix. It has been proposed that there is a requirement for surfactants to be absorbed into plant leaves at rates similar to those for the active ingredient for the best uptake results (STOCK et al, 1993). Our paper is a step towards addressing the question of the influence of anionic surfactants sodium dodecylsulfate (SDS) and sodium dicyclohexyl sulfosuccinate (DCSS) on the uptake of Zn and Sr as bivalent metals by the leaf surface of ivy (Hedera helix L.). Fine structure and permeability of ivy leaf cuticles in relation to foliar development and after selective chemical treatments and relationship between structure and permeability are well described (GILLY et al, 1997). In our previous papers are described some properties and behavior of sulfosuccinate esters in biological systems (VRBANOVÁ et al 1997; CSERHÁTI et al 1997) and leaf uptake and distribution of Zn ions by ivy (MAREŠOVÁ et al, 2009)
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