2019
DOI: 10.1590/0034-737x201966050007
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Phytotoxic potential of aqueous leaf extract of Tocoyena formosa and Rudgea viburnoides

Abstract: Plants have organic components produced as secondary metabolites able to positively or negatively interfere on normal development of other species. The objective of this research was to determine the phytotoxic effects of aqueous leaf extract from two species Rubiaceae family: Tocoyena formosa and Rudgea viburnoides on the germination and initial development of lettuce (Lactuca sativa L). The extract was obtained from mixing 50 g of fresh leaf and 500 mL of distilled water. The experiment was arranged in compl… Show more

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“…The crude aqueous extracts, equivalent to 100% concentrations, were sieved (1 mm mesh) and stored at 18 °C in amber glass bottles, previously identified, until use in bioassays (2 days). Dilutions to 75, 50 and 25% were prepared and distilled water was used as the control treatment (0%) (Vargas et al, 2019). Analysis of pH and electrical conductivity (EC) were recorded for possible interference with digital pHmeter model Instruterm pH-2000 and condutivímetro modelo Digimed DM-32.…”
Section: Methodsmentioning
confidence: 99%
“…The crude aqueous extracts, equivalent to 100% concentrations, were sieved (1 mm mesh) and stored at 18 °C in amber glass bottles, previously identified, until use in bioassays (2 days). Dilutions to 75, 50 and 25% were prepared and distilled water was used as the control treatment (0%) (Vargas et al, 2019). Analysis of pH and electrical conductivity (EC) were recorded for possible interference with digital pHmeter model Instruterm pH-2000 and condutivímetro modelo Digimed DM-32.…”
Section: Methodsmentioning
confidence: 99%