Survey, survival and control of Alternaria alternata in wheat seeds

Casa, Ricardo Trezzi; Kuhnem, Paulo Roberto; Bogo, Amauri; Belani, Ana Maria Munerati; Bolzan, Jonatha Marcel; Oliveira, Filipe Souza; Blum, Marta Maria Casa

doi:10.1590/s0101-31222012000300001

Cited by 9 publications

(3 citation statements)

References 10 publications

(12 reference statements)

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“…and Alternaria sp., which are typically decay fungi, stands out among as causative agents of root rot and leaf spots of various crops. Storage time under conditions where there is some seed-associated pathogen leads directly to loss of seed germination percentage (Casa et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Phytosanitary Quality of Genotypes of Wheat Seeds Used Northern Paraná State

Puia¹,

Borsato²,

Oliveira³

et al. 2020

JAS

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Wheat seeds can be infested and/or infected by microorganisms that might cause deterioration of this propagation structure. The aim of this study was to evaluate the health quality of sixteen wheat genotypes grown in northern Paraná. Therefore, seeds of each genotype were submitted to the blotter test with 16 repetitions, 400 seeds per sample, for phytosanitary quality evaluation. The identification of the fungi was performed based on their morphological characteristics and quantified data. The results revealed variations in incidence, with 20 fungi genera in the analyzed samples. The fungi Rhizopus sp., Aspergillus sp., Penicillium sp. and Bipolaris sp. were found in 100% of the analyzed samples, while Mucor sp. and Alternaria sp. were in 89% and 78% of the samples, respectively. The main pathogens that cause diseases in the aerial part of wheat were not found, or were low incidence in all materials analyzed. The pathogens with the highest incidence associated with wheat seeds were groups of storage fungi and known to produce mycotoxins.

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Section: Resultsmentioning

confidence: 99%

Phytosanitary Quality of Genotypes of Wheat Seeds Used Northern Paraná State

Puia¹,

Borsato²,

Oliveira³

et al. 2020

JAS

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“…As sementes de salsa cv. 'Graúda Portuguesa' deste trabalho não eram tratadas, o que potencializou grandes percentuais de incidência de A. alternata, que é caracterizada como uma espécie facilmente identificável devido à sua morfologia de conídio e às características da colônia (Casa et al, 2012).…”

Section: Resultsunclassified

INCIDÊNCIA E CARACTERIZAÇÃO MORFOLÓGICA DE Alternaria alternata EM SEMENTES DE SALSA

Barroso

Muniz

Peixoto

et al. 2019

Rev. Agric. Neotrop.

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A queima de alternaria, cujo agente causal é o fungo Alternaria spp., é uma doença ocorrente em áreas de produção de hortaliças da família Apiaceae, devido, principalmente, ao fato de sua veiculação ser por sementes contaminadas. Neste sentido, a qualidade sanitária e fisiológica de sementes é fundamental para o estabelecimento uniforme das culturas em campo, fator que garante o sucesso da produção. O objetivo deste trabalho foi estimar a incidência e caracterizar o fungo Alternaria ocorrente em sementes de salsa cv. ‘Graúda Portuguesa’. A análise de incidência foi realizada pelo método blotter test, empregando-se oito repetições (50 sementes por caixa gerbox). Após 10 dias a 25 ºC e fotoperíodo de 12 h de luz, a avaliação foi realizada examinando-se individualmente todas as sementes em microscópio estereoscópio para a confecção de lâminas semipermanentes, procedendo-se à remoção de micélio e estruturas fúngicas encontradas sobre as sementes infectadas, para caracterização e identificação da espécie do fungo incidente. Os conídios apresentaram dimensões de 21,3 - 37,6 x 6,2 - 13,9 μm (28,8 x 10,9 μm), formato de pera invertida, com coloração marrom clara e bicos de 4,0 - 13,8 μm (7,7 μm), com presença de 1-3 septos longitudinais e 2-4 transversais. Estes marcadores morfológicos levaram à identificação do fungo como A. alternata, com 70% de incidência.

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“…However, Alternaria alternata, which causes black point in wheat seeds, is a cosmopolitan fungus that can infect several plant species and cause losses that make productive capacity unfeasible (Xiao;Bergeron;Lau, 2012). Wheat seeds contaminated with this pathogen are the main source of inoculum, as the fungus maintains its viability in the off-season during storage (Casa et al, 2012). Faced with the challenge of finding alternatives for controlling A. alternata in wheat seeds, this study aimed at evaluating the effectiveness of NPs and PhT with MB and TB dyes in the growth inhibition of A. alternata in vitro, in the treatment and control of the pathogen in naturally contaminated wheat seeds, and in the physiological quality of the seeds.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles and photodynamic therapy in the treatment and control of Alternaria alternata in wheat seeds

2022

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The expansion of wheat crops (Triticum spp.) to the Brazilian Cerrado highlights the need to use pathogen-free seeds. This study aimed at evaluating the efficacy of nanoparticles (NPs) and photodynamic therapy (PhT) in inhibiting the in vitro growth of the fungus Alternaria alternata, in its treatment and control in naturally contaminated wheat seeds, and in the physiological quality of the seeds. The efficacy of NPs (ZnOCl, ZnOCl:1Cu, ZnOCl:0.1Ag; ZnO:1Cu, ZnO, and ZnO:1Ag) and PhT using methylene blue (MB) and toluidine blue (TB) dyes was evaluated in inhibiting the mycelial growth of A. alternata and in the treatment and control of the pathogen in wheat seeds by evaluating germination, emergence, GSI, ESI, accelerated ageing, and health. All NPs at 2.5 and 5 mg mL-1 concentrations and the dyes MB, TB, MB + TB at 50 and 100 µmol L-1 inhibited mycelial growth and reduced the incidence of A. alternata in the seeds. The NP ZnO:1Ag at 5 mg mL-1 and the MB + TB dye at 100 µmol L-1 were the most effective in inhibiting mycelial growth. NPs and PhT did not affect the physiological quality of seeds and controlled A. alternata in wheat seeds, demonstrating potential use in the treatment and control of the pathogen in wheat seeds.

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Survey, survival and control of Alternaria alternata in wheat seeds

Cited by 9 publications

References 10 publications

Phytosanitary Quality of Genotypes of Wheat Seeds Used Northern Paraná State

Phytosanitary Quality of Genotypes of Wheat Seeds Used Northern Paraná State

INCIDÊNCIA E CARACTERIZAÇÃO MORFOLÓGICA DE Alternaria alternata EM SEMENTES DE SALSA

Nanoparticles and photodynamic therapy in the treatment and control of Alternaria alternata in wheat seeds

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