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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 72, No. 1, 2012, pp. 157-160
Bioline Code: cj12025
Full paper language: English
Document type: Note
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 72, No. 1, 2012, pp. 157-160

 en CHEMICAL COMPOSITION AND ALLELOPATHYC ACTIVITY OF ESSENTIAL OIL OF Lippia sidoides check for this species in other resources Cham.
Marco, Cláudia Araújo; Teixeira, Erlan; Simplício, Antonio; Oliveira, Carlos; Costa, José & Feitosa, José

Abstract

The allelopathy is a process for which products of the secondary metabolism, as terpenes phenolic, of a certain vegetal intervene significantly, generally of antagonistic form, in the development of other species of plants. The objective of this work was to chemically characterize the essential oil of Lippia sidoides check for this species in other resources Cham. growing in the Cariri cearense region, Brazil, and evaluate the allelopathyc effect of this oil on the germination of lettuce ( Lactuca sativa check for this species in other resources L.), arugula ( Eruca sativa check for this species in other resources Mill.), and cauliflower ( Brassica oleracea check for this species in other resources L.), in pre-plantation application. The monoterpene thymol (84.90%) has been identified as the principal constituent in the essential oil. The experiment was done in randomized complete block, in 4 × 3 factorial; being used four essential oil combinations applied in three different species in pre-plantation applications. Emergence velocity index (EVI), germination percentage and mean time to germination (MTG), had been analyzed through daily counting carried out until the 14th day after sowing. Through qualitative analysis performed by gas chromatography coupled with mass spectrometry (GC/MS) were identified seven chemical constituents representing 97.82% of essential oil of L. sidoides, being that the constituent present in greater concentration in oil was the thymol (84.90%). Could be verified the occurrence of the negative allelopathyc effect of lettuce crop, because its present low EVI and greater MTG, for the other vegetable species there were no allelopathic effect.

Keywords
Allelopathy, plant oil, Lippia sidoides, Lactuca sativa, Eruca sativa, Brassica oleracea

 
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