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Inhibitory Effects of Aromatic Shrubs on Adjacent Vegetation: A Study on Greek and Mediterranean Ecosystems

This study explores the role of aromatic shrubs in inhibiting adjacent vegetation, focusing on Greek and Mediterranean ecosystems. It examines the biodiversity of aromatic flora, including Origanum hirtum, Origanum onites, Coridothymus capitatus, and Satureja thymbra, and their potential industrial uses. The research aims to evaluate their effectiveness in weed control through in situ assessments and in vitro phytotoxicity tests. A case study on Ikaria and Fournoi islands examines the inhibitory effects on weeds, richness, coverage, and importance value of these aromatic species. Methodologies include dose-response analyses using herbal distillates on various biotests. The results indicate varying levels of inhibitory effects among the species, with Origanum hirtum showing the highest inhibition. The study highlights the potential applications of these shrubs for weed control in agriculture.

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Inhibitory Effects of Aromatic Shrubs on Adjacent Vegetation: A Study on Greek and Mediterranean Ecosystems

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  1. Studies on the role of aromatic shrubs in the inhibition of adjacent vegetation. Kotoulas V., Panagopoulos G., Skouras V., Economou G. and Karamanos J.A. Laboratory of Agronomy, Faculty of Crop Science, Agricultural University of Athens.

  2. The biodiversity of aromatic flora in Greece Typical constituent element of Mediterranean ecosystem The state of the art

  3. Origanumhirtum Origanumonites The state of the art

  4. Coridothymuscapitatus Saturejathymbra The state of the art

  5. The classic uses - herbs - medicins - essential oils The state of the art • "Letfoodbethymedicineandmedicinebethyfood" Hippocrates, theFatherofMedicine • (460-377 B.C.)

  6. The novel uses (industrial use) - pharmaceutics - cosmetics, - agriculture - antimicrobial - animal production The state of the art

  7. the state of the art • agriculture - antimicrobial • - animal production QUESTION ? Inhibitory effect on weeds ?

  8. The inhibitory effect has been stated on oregano Observation in situ hYPOTHESIS

  9. To study the inhibitory effect of all the “origanum” species indigenous of Greek ecosystems and Mediterranean in general The longterm aim their effective use in terms of weed control Scope

  10. Objectives In situ assesement of inhibitory effect In vitro biotests of their phytotoxicity Approaching the scope………..

  11. Islands of the north-eastern Aegean sea Ikaria and Fournoi 4 aromatic species Origanumonites Origanumhirtum Coridothymuscapitatus Saturejathymbra Case study

  12. Study of adjacent vegetation during surveys in localized aromatic habitats. Plot area: 15 m2 (5m x 3m) Richness: Number of the species Coverage: (the vertical projection of plant canopy on the ground) Importance value: frequency + coverage (Wikum and Shanholtzer, 1978) Methodology

  13. MEthodology Dose respone of herbal distillates • Biotests a. Avenaradicle Determination of 50% inhibition in radicle elongation b. Spirodelapolyrhizachlorosis Determination of 50% Lethal Dose (LD50%) Doses: (ml of herbal distillate/ml of dilution) 1 (A) 0.5 (A/2) 0.25 (A/4) 0.125 (A/8) 0.062 (A/16) 0.031 (A/32) 0.015 (A/64) 0.008 (A/128) Doses: (ml of herbal distillate/ml of dilution) 1 (A) 0.5 (A/2) 0.25 (A/4) 0.125 (A/8) 0.063 (A/16)

  14. Richness Results

  15. ResultsImportance value a. Origanum onites

  16. ResultsImportance value b. Origanum hirtum

  17. ResultsImportance value c. Coridothymus capitatus

  18. ResultsImportance value d. Satureja thymbra

  19. Dose response Analysis

  20. Dose response Analysis

  21. In situ observations Lower richness in O. hirtum Lower importance value in O. onites Overview conclusions

  22. Biotests O. hirtun showed the higher inhibitory effect Overview conclusions

  23. Conversation

  24. The identification of the effective constituent The future effective use The effective application on farm for weed control Key messages

  25. THANK YOU FOR YOUR ATTENTION!!!

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