Effect of essential oils of medicinal plants on leaf blotch in Tanzania grass

Santos, Gil Rodrigues dos; Brum, Rúbia Borges Cruz Sarmento; Castro, Henrique Guilhon de; Gonçalves, Clebson Gomes; Fidélis, Rodrigo Ribeiro

doi:10.1590/s1806-66902013000300022

Cited by 13 publications

(13 citation statements)

References 25 publications

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“…The experiment for testing the phytotoxicity was carried out under greenhouse conditions (relative humidity of 70 to 80% and temperature at 27 to 33°C) according to the methodology used by Santos et al (2013). For planting of maize, Traktor (Syngenta®) seeds were used by seeding two seeds in each pit.…”

Section: Phytotoxicity Of Essential Oil Of L Sidoidesmentioning

confidence: 99%

“…Then, the vessels were maintained for 48 h with a humid and sealed cotton with a plastic bag to provide a humid chamber. After 48 h of inoculation, the pots were left in a shaded place until the appearance of the first leaf symptoms of Curvularia spot (Santos et al, 2013). For evaluating the severity of the disease, a grading scale was used according to Santos et al (2005), where 0 = healthy plant, 1 = <1% of leaf area sick, 3 = 1 to 5% of the leaf area sick, 5 = 6 to 25% of the leaf area sick, 7 = 26 to 50% of the leaf area sick, and 9 = >50% of the leaf area sick.…”

Section: Effect Of L Sidoides Essential Oil On C Lunata In Maize Plmentioning

confidence: 99%

“…For each treatment, 5 mL was sprayed on each pot, and after 1 h, it was inoculated with 5 mL of 10 4 mL −1 C. lunata conidia. The severity of the disease was assessed every 2 days after the inoculation (five assessments in total) (Santos et al, 2013).…”

Section: Preventive Effect Of Essential Oilmentioning

confidence: 99%

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Fungistatic activity of essential oil of Lippia sidoides Cham. against Curvularia lunata

Ferreira¹,

MourÃ£o²,

Santos³

et al. 2018

Afr. J. Agric. Res.

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Synthetic pesticides used in agriculture to control pathogens are being widely questioned for their harmful effects on human health and the environment. Therefore, the objective of this study was to evaluate the fungistatic activity of Lippia sidoides Cham. essential oil on alternative control of Curvularia lunata (Wakker), the causal agent of spot in maize plants. The fungitoxic contact effect was successful, resulting in a strong inhibition of C. lunata at the concentration of 50 mg mL −1. Complete adverse effect on the germination of the conidia of C. lunata was obtained at concentrations of 5 and 7.5 mg mL −1. In the preventive assay in maize plants, that is, effect of essential oil on C. lunata, a reduction in the progression of the disease was observed at the oil concentration of 7.5 mg mL −1. Regarding the curative effect in maize plants, no satisfactory result was obtained at concentrations from 0.625 to 7.5 mg mL −1. Cytotoxic test in animal cells was also performed by the viability test using MTT assay, which showed that none of the analyzed concentrations was toxic to the cells. These results demonstrate the potential effect of the essential oil of L. sidoides on the prevention and inhibition of mycelia and conidia germination, controlling the phytopathogenic fungus C. lunata.

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Section: Phytotoxicity Of Essential Oil Of L Sidoidesmentioning

confidence: 99%

Section: Effect Of L Sidoides Essential Oil On C Lunata In Maize Plmentioning

confidence: 99%

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Fungistatic activity of essential oil of Lippia sidoides Cham. against Curvularia lunata

Ferreira¹,

MourÃ£o²,

Santos³

et al. 2018

Afr. J. Agric. Res.

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“…A natureza lipossolúvel dos óleos essenciais possibilita a interação com estruturas celulares que possuem constituição lipídica, resultando no aumento da permeabilidade das membranas e consequente desequilíbrio eletrolítico e morte celular (CAVALCANTI et al, 2011). A danificação da membrana citoplasmática das lipoproteínas provoca vazamento citoplasmático, bem como esvaziamento e murcha das hifas (SANTOS et al, 2013;MAIA et al, 2015). Hammer et al (2004) avaliaram a atividade antifúngica do óleo essencial de M. alternifolia sobre Candida albicans, Candida glabrata (Anderson) Meyer & Yarrow e Saccharomyces cerevisiae Meyen ex E.C.…”

Section: Resultsunclassified

CONTROLE DE Sclerotinia sclerotiorum E Fusarium sp. COM ÓLEO ESSENCIAL DE MELALEUCA

Steffen¹,

Maldaner²,

Steffen³

et al. 2019

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RESUMOMelaleuca alternifolia é uma espécie florestal originária da Austrália, com abundante presença de óleo essencial de interesse econômico devido às reconhecidas propriedades bactericida e antifúngica contra patógenos humanos. O objetivo deste trabalho foi avaliar o efeito de concentrações do óleo essencial de melaleuca sobre o crescimento in vitro de Sclerotinia sclerotiorum e Fusarium sp, fitopatógenos de relevante importância agrícola. Concentrações crescentes de óleo essencial de melaleuca (0; 0,1; 0,25; 0,5%) foram solubilizadas em meio de cultura batata-dextrose-ágar. Os meios foram vertidos em placas de Petri (90 mm de diâmetro), seguido da deposição de um disco de micélio fúngico (9 mm de diâmetro) dos fitopatógenos avaliados. As placas foram incubadas em temperatura de 25±1 °C e fotoperíodo de 12 horas. O crescimento micelial foi avaliado através da determinação do diâmetro médio das colônias com auxílio de paquímetro digital, decorridas 72 e 96 horas de incubação. A partir dos dados de crescimento, determinou-se a porcentagem de inibição do crescimento micelial. O óleo essencial de melaleuca apresentou efeito antifúngico aos fitopatógenos S. slerotiorum e Fusarium sp. As concentrações de 0,5% promoveram 100% de inibição do crescimento de ambos os gêneros fúngicos. Considerando os resultados obtidos neste trabalho, o óleo essencial de melaleuca demonstrou potencial para composição de bioprodutos destinados ao uso agrícola. ABSTRACTMelaleuca alternifolia is a forest species from Australia, with abundant presence of essential oil with economic interest due to the recognized bactericidal and antifungal properties against human pathogens. The objective of this article was to evaluate the effect of melaleuca essential oil concentrations on the in vitro growth of Sclerotinia sclerotiorum and Fusarium sp., phytopathogens of relevant agricultural importance. Increasing concentrations of M. alternifolia essential oil (0.1; 0.25; 0.5%) were solubilized in potato-dextrose-agar culture medium. The culture medium were poured into Petri dishes (90 mm diameter), followed by the deposition of a fungal mycelium disc (9 mm diameter) of the phytopathogens. Petri dishes were incubated at 25±1 °C and photoperiod of 12 hours. Mycelial growth was evaluated by determining the average diameter of the colonies with the aid of a digital caliper after 72 and 96 hours of incubation. The percentage inhibition was determined from the growth data. Melaleuca essential oil showed antifungal effect to S. slerotiorum and Fusarium sp. Concentrations of 0.5% promoted 100% growth inhibition of both fungal genera. Considering the results obtained in this study, the melaleuca essential oil showed potential for the composition of bioproducts for agricultural use.

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“…Nevertheless, [25] when studying another pathosystem, it demonstrated good results for the alternative control. Five treatments were tested with lemongrass and other essential oils against the helmintosporiosis of Tanzania grass ( Panicum maximum Jacq.)…”

Section: Discussionmentioning

confidence: 99%

Essential Oil of Cymbopogon citratus on the Control of the Curvularia Leaf Spot Disease on Maize

et al. 2017

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The Curvularia Leaf Spot is becoming more common due to the culture expansion and the low resistance of the cultivated genotypes in tropical regions. Thus, the objective was to evaluate the fungitoxicity of the essential oil of Cymbopogon citratus upon the phytopathogen Curvularia lunata, causative agent of the Curvularia Leaf Spot. There was realized pathogenicity tests of C. lunata in maize plants, phytotoxicity of the essential oil of C. citratus and gas chromatography attached, germination tests of the conidia, and of in vitro inhibition of C. lunata. Also, there were realized tests aiming at verifying the phytopathogen control in vivo. In the pathogenicity tests, there were verified symptoms of the disease in all of the suspensions tested on plants. It was observed that the essential oil concentrations of 7.5 µL mL−1 to 50 µL mL−1 were phytotoxic. The majoritarian chemical components of the essential oil of C. citratus were Geranial (41.46%) and Neral (32.43%). The concentrations of 5 and 7.5 µL mL−1 inhibited 100% of conidia germination. None of the concentrations evaluated effectively inhibited C. lunata mycelial growth in in vitro tests. In the preventive control, the concentration of 7.5 µL mL−1 was sufficient for the reduction of the progress of the disease, however the curative control was not efficient on the tested dosages.

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Effect of essential oils of medicinal plants on leaf blotch in Tanzania grass

Cited by 13 publications

References 25 publications

Fungistatic activity of essential oil of Lippia sidoides Cham. against Curvularia lunata

Fungistatic activity of essential oil of Lippia sidoides Cham. against Curvularia lunata

CONTROLE DE Sclerotinia sclerotiorum E Fusarium sp. COM ÓLEO ESSENCIAL DE MELALEUCA

Essential Oil of Cymbopogon citratus on the Control of the Curvularia Leaf Spot Disease on Maize

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