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Registros recuperados: 22
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Antagonistic rhizobacteria and jasmonic acid induce resistance against tomato bacterial spot Bragantia
Ferraz,Hélvio Gledson Maciel; Resende,Renata Sousa; Moreira,Poliana Coutinho; Silveira,Patrícia Ricardino; Milagres,Elisângela Aparecida; Oliveira,José Rogério; Rodrigues,Fabrício Ávila.
AbstractTomato bacterial spot on tomato may be caused by four species of Xanthomonas and among them X. gardneri(Xg) is the most destructive one, especially in areas irrigated using a center pivot system in Minas Gerais state and the midwest region of Brazil. Due to the ineffectiveness of chemical control and the lack of cultivars with high levels of genetic resistance, this study investigated the potential of three antagonists (Streptomyces setonii (UFV618), Bacillus cereus (UFV592) and Serratia marcescens (UFV252)), and the hormone jasmonic acid (JA) as a positive control, to reduce bacterial spot symptoms and to potentiate defense enzymes in the leaves of tomato plants infected by Xg. Tomato seeds were microbiolized with each antagonist, and the soil was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Xanthomonas gardneri; Solanum lycopersicum; Biological control; Host defense mechanisms; Induced resistance.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000400417
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Ativação da rota dos fenilpropanoides em genótipos de soja em consequência de herbivoria por Anticarsia gemmatalis. Repositório Alice
UEDA, T. E.; GRAÇA, J. P.; GOIS, M. S.; OLIVEIRA, M. C. N. de; VENTURA, M. U.; HOFFMANN-CAMPO, C. B..
Os mecanismos de defesa das plantas envolvem uma série de características morfológicas e um complexo de substâncias químicas que são repelentes ou tóxicas aos insetos herbívoros. Algumas dessas substâncias são constitutivas, no entanto, as plantas podem ter rotas induzidas por algum tipo de estresse. Vários metabólitos secundários estão envolvidos na interação inseto-planta e muitos podem causar efeitos negativos em insetos-praga. Desta forma, o objetivo deste trabalho foi identificar e quantificar os compostos químicos induzidos em genótipos de soja por herbivoria causado por Anticarsia gemmatalis (Hübner, 1818) (Lepidoptera: Eribidae). Os genótipos IAC 24 e PI 227687 (resistentes) e BRS 257 e BMX Potência RR (suscetíveis) foram cultivados em...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Resistência induzida; Compostos de defesa; Praga de planta; Soja; Plant pests; Soybeans; Insect pests; Induced resistance.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1003538
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Benzothiadiazole (BTH) induces resistance to Pepper golden mosaic virus (PepGMV) in pepper (Capsicum annuum L.) Biol. Res.
Trejo-Saavedra,D.L; García-Neria,M.A; Rivera-Bustamante,R.F.
Pepper is an economically important crop in many countries around the world but it is susceptible to many diseases. In Mexico, diseases caused by bipartite begomoviruses have emerged as important problems in pepper. Several control strategies have been explored wiht little success; most of them are based on the avoidance of virus transmission and the breeding for resistance. Abiotic inducers can act at various points in the signaling pathways involved in disease resistance, providing long-lasting, wide-spectrum resistance. Benzothiadiazole (BTH) shares the property of activating the systemic acquired resistance pathway downstream from the SA signaling. In this work, resistance to PepGMV infection was induced in pepper plants by activating the SA pathway...
Tipo: Journal article Palavras-chave: Geminivirus; Systemic acquired resistance; Induced resistance; BTH.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400004
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Citronella essential oil in the control and activation of coffee plants defense response against rust and brown eye spot Ciência e Agrotecnologia
Pereira,Ricardo Borges; Lucas,Gilvaine Ciavareli; Perina,Fabiano José; Ribeiro Júnior,Pedro Martins; Alves,Eduardo.
The rust and brown eye spot are the main coffee diseases. The losses are due to intense defoliation of plants, which has reduced its production and longevity. The brown eye spot also occurs in fruits, with negative effects on the beverage quality. Some essential oils have presented promising results in the control of plant diseases, as an alternative to the use of fungicides. The objective of this study was to evaluate citronella essential oil in the control of rust and brown eye spot and in the activation of coffee plants defense responses. Twelve-month-old plants were sprayed with citronella oil 1000 µL L-1, acibenzolar-S-methyl 200 mg L-1 and tebuconazole fungicide 200 mg L-1. Plants were inoculated with Hemileia vastatrix and Cercospora coffeicola...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hemileia vastatrix; Cercospora coffeicola; Cymbopogon nardus; Induced resistance; Alternative control of plant disease.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000400001
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Cladosporium cladosporioides C24G modulates gene expression and enzymatic activity during leaf blast suppression in rice plants. Repositório Alice
CHAIBUB, A. A.; SOUSA, T. P. de; ARAÚJO, L. G. de; FILIPPI, M. C. C. de..
The inclusion of biological control in the integrated management of rice blast (Magnaporthe oryzae) is an alternative to reduce pesticides application. C24G, classified, as Cladosporium cladosporioides was isolated from the phylloplane of the rice plant, therefore, adapted to natural conditions of the original habitat. This study aimed to compare four application methods of C24G in rice plants to suppress leaf blast together with the increase in enzymatic activity and expression of defense genes. It was conducted by four assays (1: seed and soil, 2: soil drenching, 3: foliar spray pulverization-preventive and 4: foliar spray pulverization-curative) for choosing the best application method. The best methods identified were further investigated for the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Arroz; Oryza Sativa; Mancha de Cladosporium; Atividade Enzimática; Rice; Induced resistance; Cladosporium cladosporioides; Blast disease; Magnaporthe oryzae.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114465
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Effect of Agaricus brasiliensis and Lentinula edodes mushrooms on the infection of passionflower with Cowpea aphid-borne mosaic virus BABT
Di Piero,Robson Marcelo; Novaes,Quelmo Silva de; Pascholati,Sérgio Florentino.
The objective of the present study was to evaluate the protection of passion fruit plants against CABMV by using preparations from Agaricus brasiliensis and Lentinula edodes mushrooms. In experiments carried out in the greenhouse, the fruiting body extracts from some of the isolates of both mushrooms significantly reduced CABMV incidence in passion fruit plants. This protective effect occurred when the plant leaves, pre-treated with extracts, were later inoculated mechanically with the virus. However, the extracts did not protect the plants in experiments involving CABMV transmission by aphid vectors. An inhibitory effect of mushroom extracts on the virus particles was also demonstrated on Chenopodium quinoa, a CABMV local lesion host, by inoculating the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Shiitake; Virus inhibitors; Induced resistance; Biological control; Fruiting body extracts.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000200004
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Effect of extracts from citric biomass, rusted coffee leaves and coffee berry husks on Phoma costarricencis of coffee plants Trop. Plant Pathol.
Barguil,Beatriz M; Resende,Mário Lúcio V; Resende,Renata S; Beserra Júnior,J. Evando A.; Salgado,Sônia M. L.
Phoma leaf spot, caused by Phoma costarricensis poses a serious threat to coffee (Coffea arabica) production, especially in the highlands of the state of Minas Gerais, Brazil. Extracts of citric biomass, coffee berry husks and coffee leaves severely affected by rust caused by Hemileia vastatrix, were evaluated against P. costarricensis. In an in vitro assay, aqueous extracts of rusted leaves and berry husks plus the commercial extracts based on citric biomass named Ecolife® and Agromil® were tested at various dilutions on the mycelial growth inhibition of P. costarricensis. In vivo, coffee seedlings maintained in glasshouse, were sprayed with these extracts seven days before inoculation of P. costarricensis. Only extracts from citric biomass had inhibitory...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Coffea arabica; Fungal disease; Control; Induced resistance; Elicitors.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000500014
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Effect of sodium silicate application on the resistance of wheat plants to the green-aphids Schizaphis graminum (Rond.) (Hemiptera: Aphididae) Neotropical Entomology
Basagli,Marco A.B.; Moraes,Jair C.; Carvalho,Geraldo A.; Ecole,Carvalho C.; Gonçalves-Gervásio,Rita de C.R..
The green-aphid Schizaphis graminum (Rond.) is considered the major important pest of wheat plant, for causing severe injuries to the plants in all phenological crop stages, being able even to cause plant death. The objective of this study was to evaluate the effects of the application of silicon on the resistance of wheat plants to this pest. The experiments were carried out under greenhouse and laboratory conditions. The greenhouse experiment was conducted in a completely randomized experimental design with two treatments, consisting on silicon application and a control (without silicon application) with 10 replications and without environmental control. The laboratory bioassays were conducted under controlled environmental conditions (25 ± 1°C...
Tipo: Info:eu-repo/semantics/report Palavras-chave: Insecta; Silicon; Induced resistance; Feeding preference.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2003000400017
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Eficácia de Fusarium spp. no controle da murcha-de-curtobacterium do feijoeiro. Repositório Alice
SOARES, R. M.; MARINGONI, A. C..
bitstream/item/190141/1/Soares-p-79.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Feijão; Controle Biológico; Resistência; Beans; Curtobacterium flaccumfaciens pv. flaccumfaciens; Biological control; Induced resistance.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103494
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Foliar application of Burkholderia sp. strain TNAU-1 leads to activation of defense responses in chilli (Capsicum annuum L.) Braz. J. Plant Physiol.
Madhavan,Srinivasan; Paranidharan,Vaikuntavasan; Velazhahan,Rethinasam.
Induction of phenolics, peroxidase (PO), polyphenol oxidase (PPO), chitinase and thaumatin-like proteins (TLP) in leaves of chilli (Capsicum annuum L.) in response to foliar application with a biocontrol agent Burkholderia sp. strain TNAU-1 was studied. Chilli plants, when sprayed with Burkholderia sp. strain TNAU-1 showed increase in phenolic content one day after application and the maximum accumulation was observed seven days after treatment. Three new peroxidase isozymes (PO-1, PO-2 and PO-3) were induced in chilli leaves upon treatment with Burkholderia sp. strain TNAU-1. The activity of all the peroxidases was at the maximum level three days after treatment and subsequently decreased. Protein extracts obtained from Burkholderia sp. strain TNAU-1...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Capsicum annuum; Chitinase; Induced resistance; Peroxidase; Phenolics; Polyphenol oxidase; Thaumatin-like protein.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000400003
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Induced response against herbivory by chemical information transfer between plants Braz. J. Plant Physiol.
Campos,Wellington G.; Faria,Ana P.; Oliveira,Maria Goreti A.; Santos,Hérica L..
Plants respond to herbivores and pathogens attack with increased emission of volatile organic compounds. These molecules act as indirect defences when attracting natural enemies of herbivores and thus benefit the plant. It remains controversial whether undamaged plants capture chemicals released by damaged neighbouring plants and respond to them by increasing their defensive barriers against an imminent attack. In spite of public appeal and of this being the 25th year of the Talking Trees Hypothesis, only recently have the most sceptical scientists been convinced. The induced response to herbivory by interplant information transfer has been found in two plant-herbivore systems. However, the universality of the phenomenon and its ecological and evolutionary...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Induced resistance; Induced defense; Insect-plant interaction; Interplant air signalling; Interplant communication; Talking tress.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000400001
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Induction of resistance in chickpea (Cicer arietinum L.) against Ascochyta rabiei by applying chemicals and plant extracts Chilean J. Agric. Res.
Usman Ghazanfar,M; Wakil,Waqas; Talib Sahi,Shahbaz.
Since new fungicides are scarce in the market and because of environmental problems, researchers are now emphasizing other alternatives, such as the genetic potential of plants, resistance against pathogens, and the use of biotic and abiotic agents to develop induced or acquired resistance. We investigated the role of resistance-inducing substances (chemicals and plant extracts) in three chickpea cvs. C-44, Pb-91, and Bittle-98 in field experiments against Ascochyta blight disease. These cultivars were selected on the basis of better yield potential shown in previous experiments. Aqueous solution of salicylic acid (SA) at 0.5, 1.0, and 1.5 mM; acibenzolar-S-methyl (Bion®, ASM) at 0.4, 0.8, and 1.2 mM; and KOH at 25, 50, and 75 mM were applied, whereas...
Tipo: Journal article Palavras-chave: Induced resistance; Acibenzolar-S-methyl; Salicylic acid.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100007
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Jasmonic acid and K-phosphite enhance productivity and technological quality of sugarcane crop. Repositório Alice
MOREIRA, B. R. de A.; VIANA, R. da S.; LISBOA, L. A. M.; LOPES, P. R. M.; FIGUEIREDO, P. A. M.; RAMOS, S. B.; BONINI, C. S. B.; TRINDADE, V. D. R.; ANDRADE, M. G. de O.; MAY, A..
Abstract: Plant resistance inducers are cost-effective and environmentally pleasing strategies of plant protection to mitigate biotic and abiotic agents threatening food safety and energy security. We, accordingly, present jasmonic acid and k-phosphite as low-cost strategies to enhance productive yield and technological quality of sugarcane crop. Exogenously treatment of the sugarcane variety SP81-3250 consisted of carrying out foliar application of jasmonic acid at 1, 1.5 and 2 ml L-1 and K-phosphite at 2, 4 and 6 ml L-1 before crop flowering. Interestingly, both systemic phytorregulator and foliar fertilizer at the lowest doses significantly improved contents of total soluble solids and sucrose, as well as productive yield of fermentable sugars. Jasmonic...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Host self-defense system; Induced resistance technique; Jasmonate-methyl; Phytohormone; Plant-resistance elicitor; Saccharum sp; Cana de Açúcar; Regulador de Crescimento; Nutriente Mineral; Resistência; Sacarose; Sugarcane; Sugarcane juice; Sucrose; Sucrose-phosphate synthase; Jasmonic acid; Potassium phosphite; Induced resistance.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1116047
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Pre-inoculation of cucumber roots with Verticillium lecanii (Lecanicillium muscarium) induces resistance to powdery mildew OAK
Hirano, Emiko; Koike, Masanori; Aiuchi, Daigo; Tani, Masayuki; 平野, 恵美子; 小池, 正徳; 相内, 大吾; 谷, 昌幸.
The ability of Verticillium lecanii (Lecanicillium muscarium; B-2) to induce host resistance and defense responses against subsequent challenge with cucumber powdery mildews was examined in a glasshouse. A root test showed that, after inoculation with V. lecanii blastspore on cucumber roots, induction of systemic resistance in those V. lecanii pre-inoculated plants engendered significantly fewer lesions and reduced disease severity compared with non-inoculated plants. Furthermore, in plants inoculated with V. lecanii blastspore on their roots, the fungi showed high colonizing ability on cucumber rhizoplane and inside root tissues. Nevertheless, activities of peroxidase (PO) and phenylalanine ammonia-lyase (PAL) increased slightly, but not significantly. In...
Palavras-chave: Induced resistance; Lecanicillium muscarium; Powdery Mildew; Verticillium lecanii.
Ano: 2008 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2277
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Pseudomonas strain GRP3 induces systemic resistance to sheath blight in rice International Rice Research Institute
Pathak, A.; Sharma, A.; Johri, B. N.; Sharma, A. K..
p.35-36
Palavras-chave: Rhizoctonia solani; Sheath blight; Plant pathogenic fungi; Induced resistance; Disease resistance; Pseudomonas.
Ano: 2004 URL: http://hdl.handle.net/123456789/765
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Quitosana reduz a severidade da antracnose e aumenta a atividade de glucanase em feijoeiro-comum. Repositório Alice
DI PIERO, R.M.; GARDA, M.V..
O objetivo deste trabalho foi avaliar o controle da antracnose em feijoeiro-comum pela aplicação de quitosana. A quitosana foi pulverizada em plantas de feijão-comum, em diferentes concentrações, no estádio V3, em casa de vegetação. As plantas foram também submetidas à inoculação de Colletotrichum lindemuthianum. A dose de 9 mg de quitosana por planta propiciou redução em mais de 50% na severidade da antracnose e não causou fitotoxicidade. O efeito protetor foi local e mais intenso no intervalo de tempo de 4 dias entre tratamento e inoculação. Observou-se redução significativa no crescimento micelial e inibição total da germinação de esporos de C. lindemuthianum, quando se utilizou o polissacarídeo a 1 mg mL-1 e 80 µg mL-1, respectivamente. Em folhas do...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Phaseolus vulgaris; Colletotrichum lindemuthianum; Antibiose; Indução de resistência; Proteínas relacionadas à patogênese; Antibiosis; Induced resistance; Pathogenesis-related proteins.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/122165
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Residual polysaccharides from fungi reduce the bacterial spot in tomato plants Bragantia
Aguiar,Tarsis; Luiz,Caroline; Rocha Neto,Argus Cezar; Di Piero,Robson Marcelo.
Abstract Polysaccharides from fungal wastes were partially characterized and evaluated for their protective effects against bacterial spot caused by Xanthomonas gardneri on four tomato cultivars: Santa Cruz Kada, Natália, BRS Sena and Forty. The polysaccharides were extracted from spent mushroom substrate of Pleurotus ostreatus, residual brewery yeast (Saccharomyces cerevisiae), and basidiocarps discarded from Lentinula edodes production. These polysaccharides were characterized for total carbohydrates, phenolics and proteins content, pH, scatter intensity, conductivity, Zeta potential, DPPH scavenging assay and infrared spectroscopy. The effects of time interval between treatment and inoculation (4 or 7 days) and polysaccharide concentrations (0.5 or 1.5...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Induced resistance; Lentinula edodes; Pleurotus ostreatus; Saccharomyces cerevisiae; Solanum lycopersicon; Xanthomonas gardneri.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000200299
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Resistance inducing agents on the biology and probing behaviour of the greenbug in wheat Scientia Agricola
Pereira,Rosane Rodrigues Costa; Moraes,Jair Campos; Prado,Ernesto; Dacosta,Ronelza Rodrigues.
The greenbug Schizaphis graminum (Rond.) (Hemiptera: Aphididae) is one of the main pestinsects of wheat (Triticum aestivum, L.). Resistance inducing agents as silicon (Si) and acibenzolar-s-methyl (ASM) can provide some protection against insects and diseases. The effect of Si and/or ASM on the development and probing behaviour of S. graminum in wheat plants was evaluated. Wheat plants (cultivar Embrapa 22) were treated with Si (silicic acid at the rate of 1%) and acibenzolar-S-methyl (ASM) at the rate of 0.5%. The effects of these treatments on greenbugs were analyzed by development parameters, honeydew excretion and probing behavior monitored by Electrical Penetration Graphs (EPG). The development and honeydew experiments consisted of ten replications...
Tipo: Info:eu-repo/semantics/article Palavras-chave: S. graminum; EPG; ASM; Silicon; Induced resistance.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400009
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Resistance induction in wheat plants by silicon and aphids Scientia Agricola
Gomes,Flávia Batista; Moraes,Jair Campos de; Santos,Custódio Donizete dos; Goussain,Márcio Marcos.
The pest greenbug Schizaphis graminum (Rondani) (Hemiptera: Aphididae) stands out among the factors limiting Brazilian wheat production. Chemical control is predominant in aphid management making the production dependent on insecticides. The effect of silicon and previous infestation with aphids on the induction of resistance to the greenbug was evaluated in wheat plants. Treatments consisted of control; fertilization with calcium silicate; plant infestation with aphids; fertilization with calcium silicate + plant infestation with aphids. A free-choice preference test was performed 35 days after seedling emergence; the aphid's intrinsic rate of population increase (r m) was also determined, and the activities of three enzymes (peroxidase,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Schizaphis graminum; Triticum aestivum; Pest management; Induced resistance; Host plant resistance.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600006
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Rhizobacteria induces resistance against Fusarium wilt of tomato by increasing the activity of defense enzymes Bragantia
Ferraz,Hélvio Gledson Maciel; Resende,Renata Sousa; Silveira,Patrícia Ricardino; Andrade,Camila Cristina Lage; Milagres,Elisângela Aparecida; Oliveira,José Rogério; Rodrigues,Fabrício de Ávila.
Fusarium wilt, caused by Fusarium oxysporum f.sp. lycopersici (Fol), is one of the most important diseases that affect tomato yield worldwide. This study investigated the potential of three antagonists, Streptomyces setonii (UFV 618), Bacillus cereus (UFV 592) and Serratia marcescens (UFV 252), and as positive control the hormone jasmonic acid (JA), to reduce Fusarium wilt symptoms and to potentiate the defense enzymes in the stem tissues of tomato plants infected by Fol. The seeds were microbiolized with each antagonist, and the soil was also drenched with them. The plants were sprayed with JA 48 h before Fol inoculation. The area under the Fusarium wilt index progress curve was reduced by 54, 48, 47 and 45% for the UFV 618, JA, UFV 592 and UFV 252...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fusarium oxysporum f.sp. lycopersici; Solanum lycopersicum; Biological control; Host defense mechanisms; Induced resistance; Vascular pathogen.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000300008
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