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The permeation barrier of plant cuticles: uptake of active ingredients is limited by very long-chain aliphatic rather than cyclic wax compounds
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- BACKGROUND: The barrier to diffusion of organic solutes across the plant cuticle is composed of waxes consisting of very long-chain aliphatic (VLCA) and, to varying degrees, cyclic compounds like pentacyclic triterpenoids. The roles of both fractions in controlling cuticular penetration by organic solutes, e.g. the active ingredients (AI) of pesticides, are unknown to date. We studied thepermeabilityof isolated leaf cuticularmembranes from Garcinia xanthochymus andPrunus laurocerasus for lipophilic azoxystrobin and theobromine as modelBACKGROUND: The barrier to diffusion of organic solutes across the plant cuticle is composed of waxes consisting of very long-chain aliphatic (VLCA) and, to varying degrees, cyclic compounds like pentacyclic triterpenoids. The roles of both fractions in controlling cuticular penetration by organic solutes, e.g. the active ingredients (AI) of pesticides, are unknown to date. We studied thepermeabilityof isolated leaf cuticularmembranes from Garcinia xanthochymus andPrunus laurocerasus for lipophilic azoxystrobin and theobromine as model compounds for hydrophilic AIs. RESULTS: The wax of P. laurocerasus consists of VLCA (12%) and cyclic compounds (88%), whereas VLCAs make up 97% of the wax of G. xanthochymus.We showthat treating isolated cuticles with methanol almost quantitatively releases the cyclic fraction while leaving the VLCA fraction essentially intact. All VLCAs were subsequently removed using chloroform. In both species, the permeance of the two model compounds did not change significantly after methanol treatment, whereas chloroform extraction had a large effect on organic solute permeability. CONCLUSION: The VLCA wax fractionmakes up the permeability barrier for organic solutes, whereas cyclic compounds even in high amounts have a negligible role. This is of significance when optimizing the foliar uptake of pesticides.…
Autor(en): | Simona Staiger, Pascal Seufert, Katja Arand, Markus Burghardt, Christian Popp, Markus Riederer |
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URN: | urn:nbn:de:bvb:20-opus-204778 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Fakultät für Biologie / Julius-von-Sachs-Institut für Biowissenschaften |
Sprache der Veröffentlichung: | Englisch |
Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | Pest Management Science |
Erscheinungsjahr: | 2019 |
Band / Jahrgang: | 75 |
Heft / Ausgabe: | 12 |
Seitenangabe: | 3405-3412 |
Originalveröffentlichung / Quelle: | Pest Management Science (2019) 75:12, 3405-3412. https://doi.org/10.1002/ps.5589 |
DOI: | https://doi.org/10.1002/ps.5589 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 58 Pflanzen (Botanik) / 580 Pflanzen (Botanik) |
Freie Schlagwort(e): | active ingredients; cuticular permeability; cyclic compounds; pesicicles; very long-chain aliphatic compounds |
Datum der Freischaltung: | 30.06.2020 |
Lizenz (Deutsch): | CC BY-NC-ND: Creative-Commons-Lizenz: Namensnennung, Nicht kommerziell, Keine Bearbeitungen 4.0 International |