Podridão de raízes causada por Pythium aphanidermatum, em cultivares de alface produzidas em sistema hidropônico

Pinto, Z. V.; Cipriano, Matheus Aparecido Pereira; Galvao, J. A. H.; Bettiol, W.; Patrício, Flávia Rodrigues Alves; Santos, Amaury da Silva dos

doi:10.1590/s0100-54052011000400003

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…For the root system, the results were in agreement with Resende et al (2004), who reported dry matter accumulation in roots receives benefit from application of antagonistic fungus. Pinto et al (2011), worked on different cultivars of lettuce hydroponically and found that cv. Regina grew better in the presence of P. aphanidermatum, showing higher averages of root weight.…”

Section: Resultsmentioning

confidence: 99%

June 2019

2019

Aust J Crop Sci

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Widely consumed by the Brazilian, lettuce has a cultivated area of 35,000 ha. Among the diseases that might infect this crop, white mold causes major concerns for producers. Mold is caused by the fungus Sclerotinia sclerotiorum (Lib.) de Bar. It can lead to losses of up to 100% in lettuce. The objectives of this study were assessment of antagonistic effect of Trichoderma spp. isolates, grown and prepared on rice grain, on white mold of lettuce (S. sclerotiorum). The assay was conducted using 12 Trichoderma spp. isolates, four of which came from at least a year of storage at 4ºC, four from areas with a history of the disease and four from areas without a history of the disease. Both fungi were grown on wet rice grains and only Trichoderma strains was dried and ground to be used in the next assay. The experiment was completely randomized in a factorial 12x2 design (Trichoderma spp. × substrate inoculated or not with S. sclerotiorum) and control plants without any of the fungi. The percentage of survived plants was analyzed using AUDPC, number of leaves, stem diameter, length of root system, fresh and dry weight of shoot and root, and total dry matter. The results showed that all Trichoderma spp. were capable of lettuce growth promotion in the presence and absence of S. sclerotiorum. The isolates that showed the best biocontrol of S. sclerotiorum were TC1.15 and WM-13. To promote growth, the best isolates were UFSMT15.1 and WM-13, suggesting that the latter presents desirable characteristics for biocontrol, including excellent feasibility for large-scale production, good antagonistic activity to S. sclerotiorum and the ability to stimulate growth promotion in lettuce.

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Section: Resultsmentioning

confidence: 99%

June 2019

2019

Aust J Crop Sci

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“…Another species that is a pathogen commonly found in lettuce in Brazil, but not found in our study, is P . aphanidermatum (Patekoski & Pires‐Zottarelli, 2010; Pinto et al, 2011), which is favoured by warmer temperatures that are not very common at the beginning of the growing season in southern Brazil.…”

Section: Discussionmentioning

confidence: 99%

“…and Pythium spp. have been performed from soil under native vegetation (Miranda & Pires‐Zonttarelli, 2012) as well as forestry (Poletto et al, 2007) and vegetable crops (Patekoski & Pires‐Zottarelli, 2010; Pinto et al, 2011); however, there is limited information about field crops (Rios & Rocha, 2018).…”

Section: Introductionmentioning

confidence: 99%

Damping‐off of soybean in southern Brazil can be associated with different species of Globisporangium spp. and Pythium spp.

Molin

Ribeiro²,

Matsumoto³

et al. 2021

Plant Pathology

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Damping‐off of soybean is a common problem in some fields in southern Brazil. Frequently, Phytophthora sojae has been pointed out as the main causal agent. However, questions were raised as to whether other oomycetes could also be present. Hence, the objectives of this study were to isolate, identify, and determine the pathogenicity and aggressiveness of oomycetes isolated from soybean seedlings. Thirty‐three isolates were obtained from 13 fields. Isolates were identified based on morphology and molecular methods. Nine species were recovered: Pythium conidiophorum (n = 14, 42.4%), Globisporangium rostratifingens (n = 7, 21.2%), G. irregulare (n = 2, 6.1%), G. spinosum (n = 1, 3.0%), G. ultimum var. sporangiiferum (n = 2, 6.1%), Pythium acanthicum (n = 2, 6.1%), P. deliense (n = 1, 3.0%), P. inflatum (n = 1, 3.0%), and P. torulosum (n = 3, 9.1%). Pathogenicity and aggressiveness were determined with two soybean cultivars (DM57i52 and NEO530) in a seed rot assay and a root rot assay. All isolates were pathogenic to soybean with variable levels of aggressiveness in both assays. The range of seed disease severity index varied from 7.5 to 100 for DM57i52 and from 23.1 to 100 for NEO530. The mean root disease severity index of the soybean cultivars ranged from 29.4 to 92.8. This is the first official report of G. irregulare, G. rostratifingens, G. spinosum, G. ultimum var. sporangiiferum, P. acanthicum, P. conidiophorum, P. deliense, P. inflatum, and P. torulosum causing damping‐off of soybean in the state of Rio Grande do Sul in southern Brazil.

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IDENTIFICAÇÃO E UTILIZAÇÃO DE Trichoderma spp. ARMAZENADOS E NATIVOS NO BIOCONTROLE DE Sclerotinia sclerotiorum

et al. 2015

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RESUMO -O fungo IDENTIFICATION AND UTILIZATION OF Trichoderma spp. STORED AND NATIVE INSclerotinia sclerotiorum BIOCONTROL ABSTRACT -The fungus Sclerotinia sclerotiorum, handles significant losses in lettuce production. Being a soil borne fungus, its management is difficult, and an alternative is the use of biological control using species of the Trichoderma genus. Thus, the objectives of this study were to identify native species of Trichoderma spp. presents in the soil with (CP) and without white mold (SP), evaluate the growth rate and in vitro antagonism of Trichoderma spp. against S. sclerotiorum and to verify the biocontrol potential of Trichoderma spp. microbiolized lettuce seeds, growing in substrate infested with S. sclerotiorum. Trichoderma spp. isolates were obtained from areas with and without history of white mold or stored in water. Mycelial growth rate and sporulation of the Trichoderma spp. isolates and control of Trichoderma spp. versus S. sclerotiorum in the in vitro essays. For thein vivo essay, lettuce seeds were microbiolized with Trichoderma spp. and the substrate was infested with S. sclerotiorum. The native isolates of Trichoderma identified belong to T. koningiopsis and T. asperellum species. The CP isolates had higher mycelial growth rates when compared to the SP isolates and stored while the stored isolates showed better responses in confrontation. The application of Trichoderma spp. promoted higher seedlings quality compared to control, as well as good seedlings development in the presence of the pathogen.

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Podridão de raízes causada por Pythium aphanidermatum, em cultivares de alface produzidas em sistema hidropônico

Cited by 5 publications

References 23 publications

June 2019

June 2019

Damping‐off of soybean in southern Brazil can be associated with different species of Globisporangium spp. and Pythium spp.

IDENTIFICAÇÃO E UTILIZAÇÃO DE Trichoderma spp. ARMAZENADOS E NATIVOS NO BIOCONTROLE DE Sclerotinia sclerotiorum

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