The Pythium Complex of the Mid-North Region of Brazil

Silva, Janete Barros da; Silva, Douglas Henrique Trigueiro; Rocha, Francynara Pontes; Leal, Givanilso Cândido; Trajano, Helanny Márcia Ribeiro; Machado, Joseane Lustosa; Saraiva, Laércio de Sousa; Macêdo, Maria do Amparo de Moura; Júnior, Osiel César da Trindade; Rocha, José de Ribamar de Sousa; Sousa, Nayara Dannielle Costa de; Rios, Tamyres Lopes

doi:10.1201/9780429296406-9

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“…However, it has been reported that oomycetes belonging to the Pythium complex can also cause soybean damping‐off (Broders et al, 2007; Dorrance et al, 2004; Radmer et al, 2017; Rojas et al, 2017; Zitnick‐Anderson & Nelson, 2015). Some species have already been reported affecting soybean in the mid‐north region of Brazil (Silva et al, 2020). Hence, questions were raised as to whether other oomycetes could also be present in southern Brazil and could be contributing to plant stand reduction in soybean crops.…”

Section: Introductionmentioning

confidence: 99%

“…In Brazil, 41 Pythium species have been officially reported (Forzza, 2010), and more recently 14 species were reported in the mid‐north region of the country (Silva et al, 2020). Globisporangium has been found as well, but because the genus has recently been proposed as segregating from Pythium (Uzuhashi et al, 2010), the majority of the literature in Brazil still uses Pythium to name the species.…”

Section: Introductionmentioning

confidence: 99%

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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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