Evidência de que o fungo Rhizoctonia solani AG-1 IA adaptado à Urochloa na Colômbia mantém ampla gama de hospedeiros incluindo o milho

Poloni, Nádia Maria; Molina, Lina Maria Ramos; Chavarro-Mesa, Edisson; Garcia, Izabela Lopes; Ceresini, Paulo Cézar

doi:10.1590/0100-5405/2176

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…[35] is very important for the establishment of field crops. These pathogens can cause much damage and have the ability to infect a wide range of hosts [36]. Its control is highly desirable and is not always achieved even with the use of agrochemicals.…”

Section: Effect Of Pyroligneous Extract Treatmentmentioning

confidence: 99%

Study of the Control of Fungus Occurring in Schizolobium amazonicum Seeds with the Use of Pyroligneous Extract

Macedo

David

Yamashita

et al. 2020

IJPSS

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Fungi are the main microorganisms present in seeds, constituting the main cause of deterioration and production losses. Among the health testing methodologies for detecting fungi in seeds, incubation tests under controlled conditions facilitate fungal growth and sporulation. Therefore, this work aimed to evaluate the efficiency of pyroligneous extract in the control of phytopathogenic fungi occurring in Schizolobium amazonicum seeds. Treatments consisted of exposure of seeds to pyroligneous extract for a period of five minutes at concentrations (0%, 1%, 2.5%, 5%, 7%, 10% and 12.5%). The treated seeds were placed in Petri dishes, lined with two sheets of filter paper, moistened with sterile distilled water. The experimental design was completely randomized, consisting of 7 treatments, with 9 seeds per plate and 10 replications per treatment, totaling 630 seeds arranged in 7 Petri dishes. The evaluation was performed 8 days later, with the aid of stereoscopic and light microscopy, where the fungal growth in each seed in the plates was verified for the incidence calculation and then the identification of these. Pyroligneous extract was found to be efficient in reducing the fungal incidence of the genera Fusarium sp. and Rhizoctonia sp., fungi considered important plant pathogens that could compromise seed quality and seedling establishment in the field. It also reduced the incidence of storage fungi capable of causing seed deterioration and consequent loss of vigor, such as Aspergillus spp. occurring in seed samples of S. amazonicum. However, Penicillium sp was not controlled by treatment of S. amazonicum seeds with pyroligneous extract up to 12.5% concentration.

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Section: Effect Of Pyroligneous Extract Treatmentmentioning

confidence: 99%

Study of the Control of Fungus Occurring in Schizolobium amazonicum Seeds with the Use of Pyroligneous Extract

Macedo

David

Yamashita

et al. 2020

IJPSS

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“…An example of a similar phenomenon of host range expansion via host shift (i.e., from two phylogenetically close host species) was the emergence of the maize‐adapted population of R. solani AG‐1 IA in Portuguesa State, Venezuela (González‐Vera et al , ). A later report indicated that R. solani AG‐1 IA adapted to signal grass in Colombia also has evolutionary potential to emerge as a maize pathogen (Poloni et al , ). In fact, the isolates of R. solani AG‐1 IA obtained from signal grass in Rondônia caused severe damage on maize and on several other Poaceae forage hosts (Figure d–g), such as Tifton 85 ( Cynodon sp.…”

Section: Discussionmentioning

confidence: 99%

A broad diversity survey of Rhizoctonia species from the Brazilian Amazon reveals the prevalence of R. solani AG‐1 IA on signal grass and the new record of AG‐1 IF on cowpea and soybeans

et al. 2020

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Leaf blight, sheath blight, and web blight are major diseases caused by Rhizoctonia species on both Fabaceae and Poaceae plant hosts in the Brazilian Amazon agroecosystem. To determine the diversity of Rhizoctonia species associated with foliar diseases on fabaceous (cowpea and soybean) and poaceous (rice and signal grass [Urochloa brizantha]) hosts, a broad survey was conducted in Pará, Rondônia, Roraima, and Mato Grosso, in the Amazon, from 2012 to 2013. We extended our survey to Cerrado areas of Mato Grosso, and the lowlands of Paraíba Valley, in São Paulo, where these Rhizoctonia foliar diseases have not been reported so far. Our findings revealed that these diseases are caused by a diversity of Rhizoctonia solani AG‐1 complex. We detected that R. solani AG‐1 IA (sexual phase Thanatephorus cucumeris) was the predominant pathogen associated with signal grass leaf blight and collar rot diseases in the Amazon, especially in Rondônia and northern Mato Grosso. In addition, a subgroup of R. solani (AG‐1 IF), not previously reported in Brazil, was associated with leaf blight on cowpea and soybean, in Roraima. Another subgroup (AG‐1 ID) was also detected in Roraima. In Mato Grosso Cerrados we did not find any of the major Rhizoctonia foliar pathogens. Instead, R. oryzae (Waitea circinata) was the predominant species associated with a collar rot on U. brizantha. In the lowlands of São Paulo, R. oryzae‐sativae (Ceratobasidium oryzae‐sativae) was the predominant pathogen detected causing the rice sheath spot disease.

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“…Análises experimentais do crescimento micelial sob condições de estresse de temperatura, associadas às medidas de variância genética aditiva e de evolucionabilidade deste carácter, nos permitiriam inferir sobre o potencial adaptativo de R. solani AG-1 IA à variações térmicas ambientais, de forma semelhante ao procedimento usado para determinar a adaptabilidade evolutiva do patógeno a novos hospedeiros (22,23,27). Isso porque evolucionabilidade é definida como a capacidade para a evolução adaptativa ou do potencial adaptativo de uma população, i.e., medidas de resposta à seleção (15,28,29) que, no caso de fitopatógenos, pode ser imposta por estresses ambientais (28,30) ou por variantes biológicas dos hospedeiros (22,23,27).…”

Section: Introductionunclassified

Potencial adaptativo de populações de Rhizoctonia solani AG-1 IA associadas ao arroz e à Urochloa brizantha ao estresse térmico

et al. 2019

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RESUMO Muitos fitopatógenos de ampla distribuição geográfica como os fungos fitopatogênicos do gênero Rhizoctonia, estão sujeitos a extremas flutuações de temperatura em seus habitats. Para sobreviver a tais flutuações térmicas, esses organismos desenvolveram a habilidade de regular seus valores fenotípicos para adaptações térmicas bem como a outras variações ambientais específicas. O objetivo do presente estudo foi determinar o efeito do estresse térmico na evolucionabilidade para crescimento micelial de duas populações hospedeiro-distintas de Rhizocctonia solani AG-1 IA infectando arroz (OS6) ou Urochloa (BBT1) e compará-las a uma população de R. oryzae-sativae de arroz (OS5), espécie adaptada a temperaturas mais elevadas. As populações foram submetidas a duas temperaturas de crescimento: 25°C e 35°C (temperatura ótima e de estresse para R. solani AG-1 IA). Baseando-se em medidas do crescimento micelial, estimaram-se os coeficientes de variância genotípica (IG), variância ambiental (IE) e herdabilidade no sentido amplo (h2) como medidas de evolucionabilidade. Enquanto a população OS5 de R. oryzae-sativae foi pouco influenciada pelo estresse térmico, a 35oC detectou-se redução de h2 nas populações BBT1 e OS6 de R. solani AG-1 IA. Entretanto, os valores relativamente altos de h2 a 35oC (0,63 ± 0,07) indicaram que tanto a população BBT1 quanto a OS6 de R. solani AG-1 IA têm potencial de adaptação ao estresse térmico.

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Evidência de que o fungo Rhizoctonia solani AG-1 IA adaptado à Urochloa na Colômbia mantém ampla gama de hospedeiros incluindo o milho

Cited by 6 publications

References 15 publications

Study of the Control of Fungus Occurring in Schizolobium amazonicum Seeds with the Use of Pyroligneous Extract

Study of the Control of Fungus Occurring in Schizolobium amazonicum Seeds with the Use of Pyroligneous Extract

A broad diversity survey of Rhizoctonia species from the Brazilian Amazon reveals the prevalence of R. solani AG‐1 IA on signal grass and the new record of AG‐1 IF on cowpea and soybeans

Potencial adaptativo de populações de Rhizoctonia solani AG-1 IA associadas ao arroz e à Urochloa brizantha ao estresse térmico

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