Mecanismos bioquímicos da defesa do algodoeiro à mancha de ramulária mediados pelo silício

Curvêlo, Carmen Rosa da Silva; Rodrigues, Fabrício Ávila; Silva, Leandro de Castro; Nascimento, Kelly Juliane Telles; Berger, Paulo Geraldo

doi:10.1590/s0006-87052013005000017

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…Lemes et al (2011) verificaram aumento no período de incubação e redução na área abaixo da curva de progresso da ferrugem asiática em plantas supridas com silício em comparação a plantas não supridas com esse elemento. Curvêlo et al (2013) verificaram aumento no período de incubação e no período latente da ramulose em folhas de plantas de algodoeiro das cultivares NuOpal e BRS Buriti supridas com Si. No presente estudo, a maior concentração foliar de Si contribuiu para reduzir a severidade da antracnose em plantas de feijoeiro supridas com este elemento, de forma semelhante ao que ocorre em outros patossistemas (Datnoff et al, 2007).…”

Section: Discussionunclassified

Aspectos microscópicos da interação feijoeiro-Colletotrichum lindemuthianum mediados pelo silício

et al. 2014

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A antracnose, causada pelo fungo Colletotrichum lindemuthianum, é uma das doenças mais destrutivas que afetam a cultura do feijoeiro. Com o objetivo de encontrar alternativas para o controle dessa doença, o presente trabalho investigou, em nível microscópico, o efeito do silício (Si) na resistência do feijoeiro à infecção por C. lindemuthianum. Plantas de feijoeiro (cv. Pérola) foram cultivadas em solução nutritiva contendo 0 (-Si) ou 2 mM (+Si) de Si e inoculadas no estádio de crescimento V4 com uma suspensão de conídios de C. lindemuthianum. A severidade da antracnose decresceu cerca de 52% nas folhas das plantas supridas com Si (4,4%) em relação às folhas das plantas não supridas (8,5%). Observações de folhas de feijoeiro das plantas não supridas com Si no microscópio eletrônico de varredura revelaram alterações morfológicas nas nervuras em contraste com as folhas de plantas supridas com Si. Utilizando-se a microanálise de raios-X, verificou-se maior concentração dos minerais enxofre, potássio e Si nas folhas das plantas supridas com Si. Em conclusão, o suprimento de Si em plantas de feijoeiro foi importante para reduzir os sintomas da antracnose.Palavras-chave: Colletotrichum lindemuthianum, Phaseolus vulgaris L., microscopia eletronica de varredura, microanálise de raios-X, nutrição mineral. Microscopic aspects of the interaction bean-Colletotrichum lindemuthianum mediated by silicon AbstractThe anthracnose, caused by the fungus Colletotrichum lindemuthianum, is one of the most destructive diseases affecting bean crop. With the objective to find alternative to the control this disease, this study investigated, at the microscopic level, the effect of silicon (Si) on bean resistance to infection by C. lindemuthianum. Bean plants (cv. 'Pérola') were grown in nutrient solution containing 0 (-Si) or 2 mM (+ Si) of Si and inoculated in the V4 growth stage with a suspension of conidia of C. lindemuthianum. The disease severity decreased by 52% in the leaves of plants supplied with Si (4.4%) in relation to the leaves of non supplied plants (8.5%). Observations of bean leaves of plants not supplied with Si by scanning electron microscopy revealed morphological changes in the veins in contrast with the leaves of plants supplied with Si. By using the X-ray microanalysis, it was found higher concentrations of the minerals sulfur, potassium and Si in the leaves of plants supplied with Si. In conclusion, the supply of Si in bean plants was important to reduce the symptoms of anthracnose.

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Section: Discussionunclassified

Aspectos microscópicos da interação feijoeiro-Colletotrichum lindemuthianum mediados pelo silício

et al. 2014

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“…To 30 μ L of the enzymatic extract, a solution containing 115 μ L of 0.1 M sodium borate buffer (pH 8.8) and 55 μ L of L-phenylalanine (20 mM) was added [ 31 ]. The mixture was allowed to react at 30°C for 30 min in a water bath.…”

Section: Methodsmentioning

confidence: 99%

Endophytic Colletotrichum siamense for Biocontrol and Resistance Induction in Guarana Seedlings

Casas

Pereira

Costa-Neto

et al. 2021

International Journal of Microbiology

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Paullinia cupana var. sorbilis, known in Brazil as guarana plant, is an important plant and a major traditional crop in the State of Amazonas. It is a native Brazilian species of great economic and social importance, particularly in the Amazon region. Anthracnose caused by Colletotrichum spp. is the main challenge for this crop. Therefore, the present study verified whether C. siamense, an endophytic fungus infected with a mycovirus, could protect the seedlings and reduce or eliminate the characteristic symptoms. Total proteins and enzymatic activities of pathogenesis-related proteins (PRPs), including peroxidase (POX), chitinase (CHI), and phenylalanine ammonia lyase (PAL), were quantified. Guarana seedlings of cultivar Maués were sprayed with a C. siamense conidia suspension (5.0 × 103 conidia/mL). After ten days, the seedlings were sprayed with a suspension of the phytopathogen’s conidia (1.0 × 106 conidia/mL). One group of these seedlings received the fungicide indicated for this crop. The fungicide was applied twice with an interval of 15 days between applications. Negative control seedlings did not receive any treatment (except water and fertilization), and positive control seedlings were treated only with the phytopathogen. The experiment was conducted between December 2019 and February 2020 in a greenhouse. The treatments were applied at an average temperature of 25°C and 85% relative humidity. Leaflets were randomly collected from each treatment group at 0, 48, 72, and 96 hours after pathogen inoculation and analyzed for total protein and enzyme production (POX, PAL, and CHI). After 28 days, the percentage of leaf lesions on the seedlings was evaluated. C. siamense inoculation reduced lesions. There were differences in total proteins and PRPs at different timepoints after inoculation, except for CHI activity, among treatments. To the best of our knowledge, this is the first record of resistance induction in guarana plants.

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“…However, the initial content of cellulose is low, and the process of fiber formation is long, starting in pre-anthesis and extending for up to 50-70 days (BELTRÃO et al, 2008;SESTREN;LIMA, 2015). As a carbohydrate, the cellulose deposition process depends directly on the plant photosynthetic capacity, which is affected by RLS occurrence (CURVÊLO et al, 2013).…”

Section: Model Summarymentioning

confidence: 99%

Ramularia leaf spot effect on yield and fiber quality of cotton submitted to fungicide application

Tormen¹,

Blum

2019

Rev. Caatinga

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Ramularia leaf spot (RLS) is the major cotton disease in Brazil and one of the main causes of crop yield reduction. The disease causes defoliation reduces photosynthetic capacity and causes premature opening of bolls. Due to the impact of RLS on the production of Brazilian cotton and the lack of scientific publications investigating the disease, the present work aims to evaluate the efficiency of fungicides in controlling disease and their impact on yield and fiber quality. Three field experiments were carried out during the 2014/2015 and 2016/2017 seasons in Planaltina, Federal District and Cristalina, Goiás. Experiments followed a randomized complete block design (4 blocks) and treatments consisted of the application of fungicides, plus a non-treated plot. The fungicide applications began preventively and were repeated every 14 days until six sprays had been completed. Severity of RLS was assessed and used to calculate the area under disease progress curve (AUDPC). Yield and cotton fiber quality were also evaluated. All fungicides had reduced AUDPC and obtained higher cotton yields in relation to the non-treated plot. Strobilurin-group fungicides (azoxystrobin, pyraclostrobin and picoxystrobin) showed low effectiveness when sprayed alone. The demethylation inhibitor fungicides (difenoconazole, epoxiconazol, tetraconazol and metconazole) were more effective than the strobilurins. The highest efficiency rates were achieved by application of pyraclostrobin + fluxapyroxad, pyraclostrobin + epoxiconazole + fluxapyroxad and fentin hydroxide. Disease severity affected cotton yield, causing losses from 14.8% to 31.7%. Resultant reductions in cotton fiber quality negatively affect the micronaire composition, altering the length, strength and uniformity of fibers.

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Mecanismos bioquímicos da defesa do algodoeiro à mancha de ramulária mediados pelo silício

Cited by 8 publications

References 26 publications

Aspectos microscópicos da interação feijoeiro-Colletotrichum lindemuthianum mediados pelo silício

Aspectos microscópicos da interação feijoeiro-Colletotrichum lindemuthianum mediados pelo silício

Endophytic Colletotrichum siamense for Biocontrol and Resistance Induction in Guarana Seedlings

Ramularia leaf spot effect on yield and fiber quality of cotton submitted to fungicide application

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