Atividade antifúngica e proteção do tomateiro por extratos de plantas medicinais

Itako, Adriana Terumi; Schwan-Estrada, Kátia Regina Freitas; Júnior, João Batista Tolentino; Stangarlin, José Renato; Cruz, Maria Eugênia da Silva

doi:10.1590/s1982-56762008000300011

Cited by 30 publications

(17 citation statements)

References 7 publications

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“…Desta forma, o aumento da concentração dos extratos promoveu aumento da porcentagem de esporos não germinados. Este resultado também foi observado por Itako et al (2008) …”

Section: Influência De Extratos Deunclassified

EFEITO DE EXTRATOS DE Allamanda blanchetti NO CONTROLE DE Alternaria brassicicola EM MUDAS DE COUVE-MANTEIGA

2015

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RESUMO − O objetivo do presente trabalho foi avaliar o efeito do extrato de uma planta nativa da caatinga (Allamanda blanchetti) no controle do fungo Alternaria brassicicola quanto à indução de mecanismos de resistência em mudas de couve-manteiga e ação fungitóxica direta. Em condições de casa de vegetação, as mudas de couve-manteiga foram pulverizadas com os extratos de A. blanchetti extraídos a quente e a frio, nas concentrações 0, 100, 500 e 1000 ppm. Avaliações da severidade da doença foram realizadas a 5, 6, 7, 8, 9 e 10 dias após a inoculação. Peroxidases foram analisadas em cinco tempos, quais sejam, 0, 24, 72, 120 e 168 horas após a pulverização das mudas com os extratos. Além disso, fora avaliado também a capacidade dos extratos a quente e a frio a 0, 100, 500 e 1000 ppm em inibir a germinação dos esporos de A. brassicicola. As concentrações de 1000 ppm dos extratos a quente e a frio foram as mais eficientes no controle da doença. O extrato de A. blanchetti induziu aumento da atividade de peroxidase às 24 horas após a aplicação dos tratamentos e promoveu inibição da germinação dos esporos de A. brassicicola. Estes resultados indicam o potencial de A. blanchetti no controle de A. brassicicola, tanto pela ação direta quanto pela ativação de mecanismos de defesa. Palavras EFFECT OF THE Allamanda blanchetti EXTRACTS ON THE CONTROL OF Alternaria brassicola IN SEEDLINGS OF KALEABSTRACT − The objective of this study was to evaluate the effect of the extract from a native plant from caatinga (Allamanda blanchetti) in the control of the fungus Alternaria brassicicola, concerning to induction of resistance mechanisms in seedlings of kale and direct fungitoxic action. Under greenhouse conditions, the seedlings of kale were sprayed with extracts from A. blanchetti extracted at hot and at cold at concentrations of 0; 100; 500 to 1000 ppm. Analysis of disease severity were performed at 5; 6; 7; 8; 9:10 days after inoculation. Peroxidases were analyzed five times 0; 24; 72; 120, and 168 hours after spraying the seedlings with the extracts. Furthermore, the capacity of the hot and cold extracts was also evaluated at 0; 100; 500, and 1000 ppm to inhibit the germination of spores of A. brassicicola. The concentrations of 1000 ppm of the hot and cold extracts were more effective in controlling the disease. The extract of A. blanchetti induced an increase in the peroxidase activity at 24 hours after treatment application and promote inhibition of germination of spores of A. brassicicola. These results indicate the potential from A. blanchetti to control A. brassicicola, both by direct action and the activation of defense mechanisms.

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“…Desta forma, o aumento da concentração dos extratos promoveu aumento da porcentagem de esporos não germinados. Este resultado também foi observado por Itako et al (2008) …”

Section: Influência De Extratos Deunclassified

EFEITO DE EXTRATOS DE Allamanda blanchetti NO CONTROLE DE Alternaria brassicicola EM MUDAS DE COUVE-MANTEIGA

2015

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“…These authors associated the disease reduction to the enzyme induction. Itako et al (2008) also evaluated the fungitoxic effects of crude extracts (EBAs) from Achillea millefolium, Artemisia camphorata, C. citratus and Rosmarinus officinalis against A. solani, and their protective effects on tomato plants cultivated under greenhouse conditions. These authors observed that the crude extract did not inhibit the mycelial growth, but the sporulation and the conidia germination as the EBAs of A. camphorata, C. citratus and R. officinalis were reduced at concentrations above 20%.…”

Section: Introductionmentioning

confidence: 99%

Cymbopogon citratus essential oil bioactivity and the induction of enzymes related to the pathogenesis of Alternaria solani on tomato plants

Itako

Júnior

Schwan-Estrada

2013

Idesia

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Cymbopogon citratus essential oil bioactivity and the induction of enzymes related to the pathogenesis ofAlternaria solani on tomato plants ABSTRACTThe objective of this work was to evaluate in vitro and in vivo the bioactivity of the essential oil of Cymbopogon citratus on the mycelial growth and sporulation of Alternaria solani, and also some biochemical and structural mechanisms of resistance induction on tomato plants. The plants were treated with essential oils at 0, 250, 500, 750, 1000 and 1500 μL L -1 72 hrs before the fungi inoculation. Foliar discs were collected at 0, 12, 24 and 48 h after the inoculation to verify the activity of peroxidase, polyphenol oxidase and β-1,3 glucanase. Spore germination, appressorium formation, and the mechanisms of structural resistance were evaluated 48 h after the inoculation. The in vitro responses showed direct toxic activities unlike the ones observed in vivo, where the essential oils had no fungitoxic effects on the fungi spores. In vitro, the peroxidase and polyphenol oxidase enhanced both local and systemic activities, unlike the β-1, 3-glucanase which enhanced only local activities at the highest concentrations. The essential oils of C. citratus have, therefore, potential to induce resistance in tomato plants.Key words: induced resistance, pathogenesis-related proteins, Solanum lycopersicon. RESUMEN El objetivo de este trabajo fue evaluar la bioactividad in vitro e in vivo del aceite esencial de

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“…[22]. Likewise, rosemary extracts and lemongrass were not efficient in the control of Alternaria solani [23]. Cobos et al (2015) found that garlic extracts, green coffee, lemon peel, propolis, vanilla, chitosan and lichen Evernia prunastri were efficient in vitro control of Botryosphaeria dothidea, Diplodia seriata, Eutypa lata, Ilyonectria macrodidyma, Phaeocremonium th World Congress of Vine and Wine aleophilum, Phaeomoniella chlamydospora and Plasmopara viticola [7].…”

Section: Resultsmentioning

confidence: 99%

Antifungal activity of plant extracts onPhaeomoniella chlamydospora

et al. 2016

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Abstract. The decline and death of the vine has become an obstacle to world wine production. Among the causative agents highlights the Phaeomoniella chlamydospora, causal agent of Esca and Petri disease. Plant extracts may become a viable option control considering their fungistatic and/or fungicide substances. The objective of this work was to verify the potential of the aqueous extracts of plants on the control of Phaeomoniella chlamydospora comparing to other products. The following treatments were applied: sulfur, mancozeb, difeconazole, pyraclostrobin, tebuconazole, chitosan, Bacillus subtilis, Trichoderma harzianum, and extracts of india flowers, cinnamon bark, dried leaves of rosemary and lemon grass. The treatments were added in PDA culture medium, previously autoclaved at 120 o for 20 min. Disc of 5 mm diameter of P.chlamydospora colony were transferred to the center of Petri dishes and kept at 20• C in the dark. The experimental design was completely randomized with five replications. It was evaluated the mycelial growth at five, eight and fourteen days after the installation of the experiment, obtaining the area under curve of the mycelial growth (AUCMG). The clove India extracts, cinnamon and rosemary, proved to be a control option considering their effect in the decrease of AUCMG compared to the control.

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Atividade antifúngica e proteção do tomateiro por extratos de plantas medicinais

Cited by 30 publications

References 7 publications

EFEITO DE EXTRATOS DE Allamanda blanchetti NO CONTROLE DE Alternaria brassicicola EM MUDAS DE COUVE-MANTEIGA

EFEITO DE EXTRATOS DE Allamanda blanchetti NO CONTROLE DE Alternaria brassicicola EM MUDAS DE COUVE-MANTEIGA

Cymbopogon citratus essential oil bioactivity and the induction of enzymes related to the pathogenesis of Alternaria solani on tomato plants

Antifungal activity of plant extracts onPhaeomoniella chlamydospora

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