Influência da luminosidade e da camada de cera epicuticular de superfícies de folhas de soja na infecção de Phakopsora pachyrhizi

Furtado, Gleiber Quintão; Alves, S. A. M.; Godoy, C. V.; Salatino, Maria Luiza Faria; Júnior, Nelson Sidnei Massola

doi:10.1590/s1982-56762009000500003

Cited by 9 publications

(4 citation statements)

References 17 publications

(15 reference statements)

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“…() and Furtado et al. () observed a significant reduction in uredospores germination and appressorium formation when leaves were incubated under light in comparison with dark. The absence of light favoured greater intensity of grey mould when the abaxial or adaxial leaf eucalypt was inoculated with a conidial suspension of B. cinerea .…”

Section: Discussionmentioning

confidence: 92%

“…Incubation of eucalypt plants inoculated with uredospores of Puccinia psidii in the presence of light also proved unfavourable for germination and infection of this fungus (Ruiz et al 1989). For Phakopsora pachyrhizi on soya bean leaves, Li et al (2010) and Furtado et al (2009) observed a significant reduction in uredospores germination and appressorium formation when leaves were incubated under light in comparison with dark. The absence of light favoured greater intensity of grey mould when the abaxial or adaxial leaf eucalypt was inoculated with a conidial suspension of B. cinerea.…”

Section: Discussionmentioning

confidence: 94%

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Infection Process of Botrytis cinerea on Eucalypt Leaves

Caires

Rodrigues

Furtado

2014

Journal of Phytopathology

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This study aimed to elucidate the infection process of Botrytis cinerea on eucalypt leaves. Tests were conducted to evaluate the influence of leaf side (adaxial or abaxial), leaf age and luminosity on conidial germination, appressorium formation and grey mould (GM) severity. The adaxial and abaxial surfaces of detached eucalypt leaves were inoculated with a conidial suspension of B. cinerea and kept under constant light or dark. Subsequently, the adaxial surface of young and old leaves was inoculated and kept in the dark. To evaluate the percentage of conidia germination and appressorium formation, leaf samples were collected 6 hours after inoculation (hai), clarified (alcohol and chloral hydrate) and evaluated under a light microscope. The severity of GM was assessed 10 days after inoculation. For scanning electron microscopy analysis, samples were collected from 2 to 168 hai. A higher percentage of conidia germination (92%) and GM severity (21%) occurred on the adaxial surfaces of leaves kept in the dark. There was no statistical difference between the surfaces of young and old leaves for conidia germination. No appressorium was formed by B. cinerea. The GM severity on young leaves (17.3%) was 34 times higher than on old leaves (0.5%). The micrographs showed germinating conidia emitting 1–4 germ tubes in samples at 4 hai. The fungus penetration occurred through intact leaf surfaces, and both extra‐ and intracellular colonization of the mesophyll cells by the hyphae of the pathogen were observed at 120 hai. Sporulation occurred on the adaxial and abaxial surfaces (macronematous conidiophores) and below the epidermis (micronematous conidiophores).

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 94%

Infection Process of Botrytis cinerea on Eucalypt Leaves

Caires

Rodrigues

Furtado

2014

Journal of Phytopathology

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“…J., Uberlândia, v. 35, n. 2, p. 398-408, Mar./Apr. 2019 microclimate becomes more favorable because it prevents the solar radiation action at the lower third of the plants (FURTADO et al, 2009). Thus, an estimation of genotypes agronomic parameters is necessary when analyzing soybean rust severity.…”

Section: Resultsmentioning

confidence: 99%

Morphoagronomic characters and partial resistance to soybean rust in early soybean genotypes

Oliveira¹,

Juliatti²

2019

Biosci. J.

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Soybean crop, despite the technological evolution, did not reach an average of 4,000 kg ha-1 in Brazil due to the factors of climate, nutritional and soil fertility, genetics and phytosanitary problems. Among them is the rust-soy disease of soybean, caused by the fungus Phakopsora pachyrhizi Syd. & Syd., one of the most severe, with damage up to 100%. Among the management strategies are the use of early genotypes, use of preventive fungicides and cultivars with partial resistance and tolerant to phytopathogen. To obtain resistant cultivars, six dominant genes that condition vertical (qualitative) resistance, have already been reported in the literature, but the stability of this type of resistance is not durable. Therefore, the identification of genotypes that can be used as sources of horizontal (quantitative) resistance is essential to increase the longevity of the cultivars launched in the Brazilian market. This work aimed to evaluate the resistance of 12 soybean genotypes to the pathogen and yield responses. This work was developed at Fazenda do Glória, in Federal University of Uberlândia (UFU), located in the city of Uberlândia, MG, Brazil. In the agricultural year 2015/2016 an experiment was carried out with subplots with or without fungicide Azoxistrobina + Benzovindiflupyr and subsubplots related to the evaluation position in the plant. There were 12 early-cycle genotypes, 10 from the UFU germplasm laboratory (LAGER), a commercial susceptible control, and a known resistant LAGER control. They were outlined in randomized blocks with four replicates. The experimental plots were represented by two rows of 6 m x 0.5 m, and the 2.5 m 2 area consisted of the two central rows, eliminating 0.5 m at each end of the plot. The LAGER-210 and LAGER-216 genotypes were selected for crop and use value (CUV) studies because they showed partial resistance to rust, short cycle, good morphoagronomic characteristics and higher yields.

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“…According to Furtado et al (2009) Thus, the optimal biomass must be studied for each variety of soy, avoiding overgrowth and potential problems brought by diseases.…”

Section: Methodsmentioning

confidence: 99%

Nitrogen doses on soybean growth and Asian rust progress in two cultivars

Ramos

Andriolo²,

Balardin³

et al. 2017

Com. Sci.

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The main goal of this study was to analyze the range of effects of nitrogen doses on Asian soybean rust (Phakopsora pachyrhizi Sydow) progress over two soybean (Glycine max Merril) cultivars. Two experiments were carried out in greenhouse and in the field, during the 2011/12 and 2012/13 crop years. In the greenhouse, plants were grown in sand in 2011/12 and in a mix of sand and soil in 2012/2013, and supplied with five N doses by dripping fertigation. In the field, the crop was fertilized with six nitrogen doses with broadcast applications. The pathogen was inoculated in all experiments. It was assessed the Area Under Rust Progress Curve (AURPC), defoliation, dry matter, total concentration of N in leaves, number of grains per plant, thousand grain weight and yield. In the greenhouse experiment, nitrogen rates increased the plant growth and the disease progress during the first year. In 2011/12 field assay, a slight decrease of rust progress and a slight increase in yield from 160 to 242 kg ha -1 were recorded. However, under favorable environmental conditions for Asian soybean rust, the increases in grain yield obtained by using high N rates on both cultivars were minor than the damage caused by the disease.

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Influência da luminosidade e da camada de cera epicuticular de superfícies de folhas de soja na infecção de Phakopsora pachyrhizi

Cited by 9 publications

References 17 publications

Infection Process of Botrytis cinerea on Eucalypt Leaves

Infection Process of Botrytis cinerea on Eucalypt Leaves

Morphoagronomic characters and partial resistance to soybean rust in early soybean genotypes

Nitrogen doses on soybean growth and Asian rust progress in two cultivars

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