A Method for Colletotrichum graminicola Inoculation in Maize Stalks

Parreira, D. F.; Zambolim, Laércio; Cota, L. V.; Marcondes, Marielle Martin; Lanza, F.; Neves, W. S.; Figueiredo, J. E. F.; Souza, André Luis Santos de

doi:10.18512/1980-6477/rbms.v15n1p53-64

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…Several studies show that the employment of SADs makes it possible to study the genotype reaction to the different diseases and the selection of resistance sources in the development of new crops (Poltronieri et al, 2016;Aktar & Shamsi, 2018). Attained estimates from the SADs also serve as subside for the definition of pathogen inoculation methods (Parreira et al, 2016) and to quantify the efficiency of disease control methods (Marcuzzo et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

Agraria

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A standard area diagram set (SADs) for severity evaluation of septoriosis (Septoria passiflorae) in fruit of sour passion fruit (Passiflora edulis Sims) was developed and validated in this study. The SADs presented eight severity levels (0.3; 0.5; 1; 2; 4; 10; 18; and 30%). For its validation, 20 raters were divided into groups (G1 and G3, inexperienced; G2 and G4, experienced) who initially estimated the disease severity without the aid of the SADs. Subsequently, G1 and G2 performed the second evaluation without the SADs, and G3 and G4 completed the second evaluation with the proposed SADs for each disease. The accuracy and precision of the evaluations were determined by simple linear regression and by Lin's concordance correlation coefficient. The proposed SADs allowed accurate and precise quantification of septoriosis severity, increasing the agreement between estimated and actual values. The increase in accuracy and precision in the non-aided groups, when present, was less pronounced than those increments observed in the SADs-aided groups. Lin's concordance correlation coefficient confirmed the increases in accuracy and precision detected by the linear regression analysis.Escala diagramática para a quantificação da severidade da septoriose em frutos do maracujazeiro azedo RESUMO: Uma escala diagramática para a avaliação da severidade da septoriose (Septoria passiflorae) em frutos do maracujazeiro azedo (Passiflora edulis Sims) foi desenvolvida e validada neste estudo. A escala diagramática apresentou oito níveis de severidade (0,3; 0,5; 1; 2; 4; 10; 18; e 30%). Para a sua validação, os 20 avaliadores foram divididos em grupos (G1 e G3, sem experiência; G2 e G4, com experiência), que inicialmente estimaram a severidade da doença sem auxílio da escala. Posteriormente, G1 e G2 fizeram outra avaliação sem escala, e G3 e G4 realizaram a avaliação com a escala proposta. A acurácia e a precisão das estimativas foram determinadas por regressão linear simples e pelo coeficiente de correlação de concordância de Lin. A escala diagramática proposta permitiu quantificar a severidade da septoriose de forma acurada e precisa, aumentando a concordância entre os valores estimados e os reais. O aumento da acurácia e precisão nos grupos que realizaram dupla avaliação sem escala, quando ocorreu, foi mais discreto que os incrementos observados nos grupos que utilizaram a escala. A análise de concordância de Lin confirmou os incrementos da acurácia e precisão detectados pela análise de regressão linear. Palavras-chave: frutos; Passiflora edulis Sims; fitopatometria; Septoria passifloraeStandard area diagram set for quantification of septoriosis in fruit of sour passion fruit Rev. Bras.

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Section: Introductionmentioning

confidence: 99%

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

Agraria

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“…Inoculation with C. graminicola using the method of Parreira et al (2016) successfully induced infection and disease in maize stalks. In control plants, the insertion of sterile toothpicks without inoculum did not cause lesions in the stalks or vascular tissues, thus, allowing plants to grow and develop normally throughout their life cycle.…”

Section: Discussionmentioning

confidence: 99%

Physiological and biophysical alterations in maize plants caused by Colletotrichum graminicola infection verified by OJIP study

Campos

Almeida

Silva

et al. 2021

Trop. plant pathol.

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Anthracnose caused by Colletotrichum graminicola (Ces.) Wils is among the most aggressive maize diseases worldwide, considerably hindering crop productivity. To investigate the responses underlying the host-pathogen interaction involved in anthracnose infection, we conducted two field experiments in some of the main grain producing areas of the State of Tocantins, in Brazil. Four maize hybrids (with differential tolerance to C. graminicola) were sown in February and March, 2017. Chlorophyll fluorescence measures were performed according to the OJIP protocol; additionally, SPAD readings were conducted and productivity components were assessed. Inoculation with the fungus spore suspension affected the response curve of the chlorophyll fluorescence transient, SPAD index, and productivity components. Anthracnose stalk rot caused 20-25% reduction in grain weight, 6-8% reduction in maize ear size, and 20-23% reduction in ear weight. Furthermore, plants experiencing C. graminicola rot showed reduced SPAD index and a 24-34% reduction in the activity indicator of PSII (PI Total ). These changes in the photosynthetic apparatus were successfully observed via chlorophyll fluorescence measurements.

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“…In: Congresso Brasileiro de Milho e Sorgo, Cuiabá. Costa, R. V.; Campos, L.; Silva, D. D.;Cota, L. V.;Almeida, R. (2018). Híbridos e épocas de semeadura afetam a incidência de enfezamentos em milho.…”

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Resistência De Genótipos De Milho Indicados Para O Tocantins Frente À Cigarrinha Do Milho

Da Silveira Marques,

De Santana Souza

2023

Agri-Environ Sci

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A cigarrinha-do-milho Dalbulus maidis (Hemiptera: Cicadellidae) representa um grave problemafitossanitário à cultura, pois causa danos de ordem direta e indireta às plantas. Neste sentido, e buscando porsoluções sustentáveis dentro do Manejo Integrado de Pragas, o estudo objetivou a prospecção de fontes deresistência por não preferência e/ou tolerância em 7 genótipos frente D. maidis em condições de campo.Avaliou-se a atratividade da praga pelos diferentes genótipos, assim como a porcentagem de plantas comenfezamento e a produtividade. Manteve-se para comparação, um ensaio espelho onde foi realizado o manejoconvencional químico, a fim de poder comparar níveis de tolerância. Os dados foram submetidos à análise devariância pelo teste F e revelaram que o uso de inseticidas influenciou negativamente nas populações decigarrinha em todos os genótipos. ‘AG1051’ e ‘AV4142’ se destacaram com menores valores absolutos deadultos de D. maidis sobre suas plantas, indicando a presença de fatores antixenóticos.

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A Method for Colletotrichum graminicola Inoculation in Maize Stalks

Cited by 4 publications

References 19 publications

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Physiological and biophysical alterations in maize plants caused by Colletotrichum graminicola infection verified by OJIP study

Resistência De Genótipos De Milho Indicados Para O Tocantins Frente À Cigarrinha Do Milho

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