Abstract
The allelopathic activity and chemical composition of the essential oil of Croton limae A. P. S. Gomes, M. F. Sales & P. E. Berry (marmeleiro-prateado) have been evaluated in this study. The essential oil was extracted by hydro-distillation. A completely randomized design was used to test the influence of the essential oil from fresh leaves of C. limae in concentrations of 0.10%, 0.25%, 0.50%, 0.75%, 1%, 1.25%, 2.50%, 3.75%, and 5% on the germination and growth of Lycopersicum esculentum Mill. (tomato) seeds by indirect contact, with a control using water and dimethyl sulfoxide (DMSO). Each treatment consisted of five replicates using twenty seeds in each one. The chemical analysis of the essential oil was carried out using gas chromatography coupled with mass spectrometry. The analysis showed the occurrence of 14 chemical compounds, the majority of which were cedrol (28.4%), eucalyptol (17.4%) and a-pinene (13.8). The C. limae essential oil inhibited germination of the tomato seeds at concentrations of 2.50% and upwards and it affected the caulicles and radicles of tomatoes at all concentrations tested. The tests proved that C. limae presents phytotoxic activities.
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Claims 6
Claim · model-written summary
Croton limae essential oil contained 14 compounds.
Not reportedTaxonDirection
Verbatim
e0“The analysis showed the occurrence of 14 chemical compounds”
Claim · model-written summary
Cedrol was the most abundant oil constituent at 28.4%.
Not reportedTaxonDirection
Verbatim
e0“the majority of which were cedrol (28.4%)”
Claim · model-written summary
Eucalyptol comprised 17.4% of the oil.
Not reportedTaxonDirection
Verbatim
e0“eucalyptol (17.4%)”
Claim · model-written summary
a-pinene comprised 13.8% of the oil.
Not reportedTaxonDirection
Verbatim
e0“a-pinene (13.8)”
Claim · model-written summary
Croton oil inhibited tomato seed germination at concentrations of 2.50% and above.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- C. limae essential oile0
- Interactor
- C. limaeCroton limaee0other
- Outcome
- germination of the tomato seedse0
- Direction
- inhibitede0
- Value
- 2.50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The C. limae essential oil inhibited germination of the tomato seeds at concentrations of 2.50% and upwards”
Claim · model-written summary
Croton oil affected tomato caulicles and radicles at every tested concentration.
- Taxon
- tomatoesSolanum lycopersicume0
- Outcome
- caulicles and radicles of tomatoese0
- Qualifier
- all concentrations testede0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it affected the caulicles and radicles of tomatoes at all concentrations tested”
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