Componentes de resistência em cebola a Colletotrichum gloeosporioides

Pedrosa, Rosangela Aparecida; Maffia, Luiz A.; Mizubuti, Eduardo S. G.; Brommonschenkel, Sérgio Hermínio

doi:10.1590/s0100-41582004000600002

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…The fruits were then immediately covered with a polyethene bag for four days followed by spraying of water twice a day post removal of plastic covering. Non-inoculated (spraying only with water and surfactant) was included as a control (Pedrosa et al, 2004). The symptoms were visually estimated and disease severity index (DSI) was calculated as per Montri et al, (2009) at two weeks after spraying the inoculum on fruit based on the mean percentage lesion size of fruits (Suwor et al, 2015).…”

Section: Open-field Screening Protocolmentioning

confidence: 99%

Evaluation of screening methods for anthracnose fruit rot resistance in chilli (Capsicum spp.)

Vanlalneihi,

Radha P L,

Subbaraman Sriram

et al. 2024

J. Hortic. Sci.

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Anthracnose fruit rot caused by Colletotrichum spp. is a serious production constraint causing severe marketable yield loss in chilli. Field evaluation of chilli accessions for resistance to Colletotrichum spp. depends on various factors affecting disease expression such as edaphic conditions, temperature, rainfall, humidity and other variables that are difficult to control, therefore considered less accurate. Also, high chances of cross contamination with different Colletotrichum species leads to inconclusive assays for specific pathogen species and isolate. To identify a stable and reliable screening method, various chilli accessions were subjected to in vitro pin-prick and non-wounding spray methods using a specific pathogen isolates. When chilli accessions were screened against C. gloeosporioides isolate ‘IHRCg-1’, the in vitro pin- prick method showed positive correlation with the non- wounding spray method, except in the accession PBC80. The change in bioassay influenced the disease reaction pattern in the accession PBC 80, probably the pin pricks break the basal cuticle defense mechanism that was retained in spray inoculation method indicating varied resistance pattern. However, in the accession PBC 81 stable resistance pattern was observed against isolates of both species viz., C. truncatum ‘IIHR Ct-1’ and C. gloeosporioides ‘IIHR Cg-1’ and in the accession PBC 80 against C. truncatum ‘IIHR Ct-1’ in both the inoculation methods that depicted the expression of resistance genes during both methods of inoculation. Based on disease development pattern, the red ripe chilli expressed a variant reaction to infection by C. truncatum and C. gloeosporioides. The peak anthracnose infection at 10 DAI and 14 DAI is an accurate duration to record ‘IIHR Cg-1’ and ‘IIHR Ct-1’ infection, respectively on chilli ripe fruit for assaying the resistance.

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Section: Open-field Screening Protocolmentioning

confidence: 99%

Evaluation of screening methods for anthracnose fruit rot resistance in chilli (Capsicum spp.)

Vanlalneihi,

Radha P L,

Subbaraman Sriram

et al. 2024

J. Hortic. Sci.

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“…This variable gained a fundamental importance for disease resistance analysis. Pedrosa et al (2004) evaluated the components of resistance of eight cultivars and two onion accessions (Allium cepa) to four isolates of C. gloeosporioides inoculated by an inoculum suspension atomization or deposition of mycelium discs in leaves. In this experiment, seven resistance components similar to the components present in this work were evaluated: AUDPC, incubation period, latent period and severity of the disease.…”

Section: Figmentioning

confidence: 99%

Genetic diversity of the germplasm active bank of Capsicum of UNEMAT based on components resistant to the fungus Colletotrichum gloeosporioides

Maracahipes¹,

Viscovini²,

Annunciatto³

et al. 2016

Aust J Crop Sci

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Peppers and chilies belong to the Solanaceae family and to the genus Capsicum. The production of this vegetable is increasing in Brazil. However, there are several phytosanitary problems that are causing heavy losses to the culture, among them anthracnose. The objective of this study was to evaluate the genetic diversity of the Capsicum Germplasm Active Bank (GAB) of the UNEMAT based on components resistant to the fungus Colletotrichum gloeosporioides. 88 accessions of Capsicum spp., belonging to the Germplasm Active Bank of UNEMAT, were evaluated for reaction to the fungus Colletotrichum gloeosporioides. The experimental design was completely randomized blocks with three replications, being four unripe fruits and four ripe fruits per repetition. Both ripe and unripe fruits were collected from each plot, taken to the laboratory, disinfected and packaged in Styrofoam trays covered with a transparent plastic bag; inside each tray, moistened pieces of filter paper were placed to build the humid chamber. The trays were in an environment with a temperature controlled at 24°C ± 2. The evaluation of all the fruits was performed daily based on the measurement of lesion diameter and length of each fruit with an interval of 24 hours between each evaluation for 11 days. The assessment data were subjected to multivariate analysis and to the UPGMA clustering method. There is genetic variability in the GAB of UNEMAT with the formation of different accession groups based on resistance to anthracnose for both clustering methods applied, i.e., UPGMA and Modified Tocher. There was the formation of four groups in the dendrogram, especially regarding the accession 81 (C. annuum), which had the highest genetic dissimilarity in relation to other accessions, standing isolated in one group. According to the 3D dispersion graph, there was the formation of three groups with genetic dissimilarity among them. According to the modified Tocher method, there was the formation of five groups; the accession 38 (C. chinense) was grouped separately from the other accessions in the group five. The resistance components that had a higher relative contribution to estimate the genetic variability among analyzed accessions were area under the disease progress curve (AUDPC), lesion diameter and length on the seventh day of evaluation (DL7), and incubation period (IP), but it is necessary to use at least seven variables and explain 80% of the variability of the experiment.

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“…Os 64 genótipos foram separados com base na área abaixo da curva de progresso da severidade da doença (AA-CPSD) em quatro grupos (resistente, moderadamente resistente, suscetível e altamente suscetível) pelo teste de Scott--Knott (p<0,05) (Tabela 1). A AACPSD provê informações quantitativas que expressam, de modo integrado, o efeito da resistência na redução da intensidade da doença, o que pode auxiliar na identificação de fontes promissoras de resistência (Pedrosa et al, 2004). Desta forma, os genótipos mais resistentes, ou seja, aqueles com menores valores de AACPSD têm maior potencial para programas de melhoramento genético visando o desenvolvimento de cultivares com maiores níveis de resistência a doenças, no presente estudo, a mancha púrpura.…”

Section: Genótiposunclassified

“…Estes resultados corroboram parcialmente os do presente estudo, visto que apenas 'Crioula Alto Vale' confirmou sua resistência, enquanto 'White Creole' e 'Aurora' foram moderadamente resistentes, e 'Boreal' e 'Dehydrator # 8' foram suscetíveis. De acordo com Pedrosa et al (2004), as cultivares podem apresentar variação no comportamento se cultivadas em locais distintos, como campo e casa de vegetação.…”

Section: Genótiposunclassified

Reação de genótipos de cebola à mancha púrpura

et al. 2016

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RESUMO: A mancha púrpura é uma das doenças mais limitantes da cebola, e a resistência genética é forma de controle mais viável da doença. O objetivo deste trabalho foi avaliar a reação de genótipos de cebola a alternaria porri em campo. Foram avaliados 64 genótipos (cultivares, populações e linhagens do programa de melhoramento da embrapa) em sistema convencional de cultivo. Utilizou-se como testemunha resistente a população cnph 6342 e como suscetível a linhagem macho-fértil 420. A cultura foi implantada pelo método de semeadura direta com população de 500 mil plantas por hectare. Foi utilizado o delineamento de blocos ao acaso com cinco repetições. As parcelas foram constituídas de seis fileiras no sentido longitudinal do canteiro, espaçadas de 15 cm (área total de 0,9 m²). A doença ocorreu de forma natural no campo e, a severidade foi avaliada em dez plantas por parcela aos 80, 110 e 140 dias após a semeadura. A produtividade e a massa média de bulbos comerciais (diâmetro ≥35 mm) foram avaliadas em apenas 45 genótipos, os quais exibiram adaptação às condições de clima local e bulbificaram adequadamente. 'crioula mercosul', '446', 'bola precoce', 'juporanga l2', 'caeté', 'rainha', 'dourada', 'juporanga l7', 'cnph 6342', 'crioula alto vale' e 'roxa do barreiro' apresentaram maior resistência ao patógeno, com áreas abaixo da curva de progresso da severidade da doença (aacpsd) inferiores a 437,33, enquanto a linhagem macho-fértil 420 apresentou aacpsd de 1.177,94. Os genótipos 'brs 367' e 'shinju', por sua vez, associaram alta produtividade de bulbos comerciais e moderada resistência à doença, com produtividades superiores a 43,9 t/ha e aacpsd inferiores a 567,28, sendo considerados os mais tolerantes à mancha púrpura.

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Componentes de resistência em cebola a Colletotrichum gloeosporioides

Cited by 7 publications

References 13 publications

Evaluation of screening methods for anthracnose fruit rot resistance in chilli (Capsicum spp.)

Evaluation of screening methods for anthracnose fruit rot resistance in chilli (Capsicum spp.)

Genetic diversity of the germplasm active bank of Capsicum of UNEMAT based on components resistant to the fungus Colletotrichum gloeosporioides

Reação de genótipos de cebola à mancha púrpura

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