in vitro antibacterial effect of tobacco leaf exudates against two bacterial plant pathogens
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2015
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Abstract
Natural products are an alternative to control microorganisms that cause diseases in crops. This work aimed to evaluate different solvents for obtaining crude extracts from tobacco leaf exudates and to determine in vitro effect of these extracts against two phytopathogenic bacteria: Xanthomonas campestris(Xc) and Pectobacterium carotovorum(Pc). Crude extracts from ten tobacco lines using solvents with polarities between 3.1 and 6.2 (dichloromethane, n-butanol, ethyl acetate, methanol and ethanol 90%) were obtained. Ethanol 90% was selected as the best solvent for obtaining extracts from tobacco leaf exudates and as a substitute of dichloromethane due to the best yield. The chemical composition diversity of the ethanolic extracts was revealed by thin-layer chromatography. The antibacterial activity was evaluated by agar disk diffusion method recording the inhibition zones. Growth inhibition was observed for all extracts against Xc, and the better activity corresponded to the lines Nic 1061"TI 1738" and Nic 1016 "Incekara" until a minimal amount of 5 µg/ disc, with higher yield in case of the line Nic1061 . Only the extract of the line Nic 1015 was able to inhibit the growth of Pc until a minimal inhibitory concentration of 5 µg/disc. These results suggest a potential use of crude extracts from lines Nic 1061 and Nic 1015 "TI 1341" as an effective agent for the crop protection against Xc and Pc respectively.
| Reference Key |
capdesuer2015revistain
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| Authors | ;Yanelis Karina Capdesuñer;Maribel Rivas Paneca;Erinelvis Rodríguez Hernández;Madelín Gallo Rodríguez;Janet Quiñones Galvez;Ermis Yanes Paz;Martha Hernández de la Torre |
| Journal | gigascience |
| Year | 2015 |
| DOI |
10.15446/rev.colomb.biote.v17n1.50707
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