Efeito de Colletotrichum dematium var. truncata e Cercospora kikuchii na germinação de sementes de soja

Galli, Juliana Altafin; Panizzi, Rita de Cássia; Fessel, Simone Aparecida; Simoni, Fabiana De; Ito, Margarida Fumiko

doi:10.1590/s0101-31222005000200026

Cited by 18 publications

(14 citation statements)

References 8 publications

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“…To test for pathogenicity to seeds, four replicates of 50 seeds of cv. 'Monsoy 9144 RR' were inoculated by contact with C. cliviae PDA cultures for 48 h, in the dark, at 25°C, as in Galli et al (2005) and germination was measured seven days after inoculation by the standard blotter test. Non inoculated seeds served as control.…”

Section: Pathogenicity Of C Cliviae and C Truncatum To Soybean Seedmentioning

confidence: 99%

Biology, pathogenicity, and haplotype analyses of Colletotrichum cliviae: a novel soybean anthracnose agent in warm tropical areas

Dias

Fonseca

Dias-Neto

et al. 2018

Trop. plant pathol.

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Soybean anthracnose is a complex disease, comprising isolates of Colletotrichum truncatum and at least six other species. In Brazil, C. cliviae was recently reported as a novel causal agent of soybean anthracnose but very little information is available about the C. cliviae-soybean pathosystem. Here we report the occurrence of C. cliviae in commercial soybean fields in the Tocantins State, TO (Northern Brazil). We also describe its most distinctive morphological, biological, cultural, and pathogenic aspects, particularly in contrast with C. truncatum (the prevalent anthracnose-causing species in Brazil), including symptoms, production of sexual structures, host range, seed infection and aggressiveness to soybean cultivars. The results indicated that the involvement of C. cliviae as an anthracnose-inducing species might impact current control strategies, including crop rotation systems and the replacement of susceptible cultivars. Studies were also carried out to clarify if the Brazilian soybean-infecting C. cliviae isolates were introduced into the country via contaminated seeds or if populations are endemic. The haplotype diversity of Brazilian as well as of a worldwide collection of C. cliviae isolates (available at the GenBank) was investigated based upon polymorphisms in three genomic regions (β-tubulin 2, glyceraldehyde-3-phosphate dehydrogenase, and actin). Nine haplotypes were identified among worldwide C. cliviae isolates from six different hosts. The Brazilian soybean isolates were placed into the closely related haplotypes 5 (composed by isolates from Mato Grosso State) and 6 (which included the isolate from TO), which were discriminated from each other by one single nucleotide polymorphism. Haplotype 6 group was also composed by a Chinese isolate from Camelia sinensis. The results suggest that this cosmopolitan fungal species is more likely endemic to Brazil where it has been reported in association with plant species across distinct botanical families. Therefore, the recent outbreaks of C. cliviae isolates on soybeans can be explained by either previous misdiagnosis or they may represent a recent shift/adaptation of this fungus to this legume crop. Thus far, the geographic occurrence of C. cliviae on soybeans is restricted to northern (warm) tropical regions of Brazil. The present report adds novel and relevant information with potential for the control of anthracnose caused by C. cliviae isolates in Brazil, and possibly in warm regions elsewhere.

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Section: Pathogenicity Of C Cliviae and C Truncatum To Soybean Seedmentioning

confidence: 99%

Biology, pathogenicity, and haplotype analyses of Colletotrichum cliviae: a novel soybean anthracnose agent in warm tropical areas

Dias

Fonseca

Dias-Neto

et al. 2018

Trop. plant pathol.

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“…After 8 days of incubation, pathogenfree soybean seeds cultivar MGBR-46 were spread on the surface of the medium in the form of a single layer in order to ensure close contact with the fungal colony. Incubation was continued under the same conditions for a further 40 h (Galli et al, 2005), after which the seeds were removed and dried in a laminar flow cabinet for 24h.…”

Section: Inoculation Of Soybean Seeds With C Truncatummentioning

confidence: 99%

Effectiveness of essential oils in the treatment of Colletotrichum truncatum-infected soybean seeds

Silva¹,

Souza²,

Machado³

et al. 2012

Trop. plant pathol.

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The aim of the study was to evaluate the antifungal activity of essential oils from "hortelã do campo" (Hyptis marrubioides), "alfazema-do-Brasil" (Aloysia gratissima) and "erva-baleeira" (Cordia verbenacea) and their efficacy in the treatment of soybean seeds infected with Colletotrichum truncatum. In vitro assays were performed to evaluate the effects of the oils on spore germination, mycelial growth, and the production and viability of C. truncatum conidia. Soybean seeds inoculated with C. truncatum were treated with essential oils at concentrations ranging from 0.5 to 2% and grown under greenhouse conditions. Seed health and germination percentages were evaluated according to standard protocols. Seedling emergence, stand establishment and the percentages of dead seedlings were determined, together with the emergence speed index, plantlet height and dry weight of aerial biomass. The oils from H. marrubioides, C. verbenacea and A. gratissima inhibited the germination and production of conidia as well as the growth of C. truncatum. At concentrations ≥ 1%, the effectiveness of the oils against soybean anthracnose was superior to, or at least comparable with, that of the fungicide carbendazim. The viability of conidia and the germination of soybean seeds were not affected by any of the treatments with essential oils. It is concluded that essential oils from H. marrubioides, A. gratissima and C. verbenacea have potential as alternatives to synthetic fungicides in the control of anthracnose in soybean seeds.

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“…Também, Hamawaki et al (2002) verificaram correlação negativa entre a incidência de C. kikuchii e a germinação e o vigor de sementes de soja. Entretanto, são observados resultados divergentes na literatura, tais como os de Oliveira et al (1993) e Galli et al (2005), os quais não verificaram efeito negativo da incidência de C. kikuchii na qualidade fisiológica de sementes de soja.…”

Section: Introductionunclassified

Sementes de soja infectadas por Cercospora kikuchii, sob déficit hídrico

Pereira¹,

Pereira²,

Júnior³

et al. 2017

Científica

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ResumoO desempenho de sementes de soja e o estabelecimento da cultura em campo podem ser afetados negativamente pela contaminação das sementes por fitopatógenos, principalmente quando as sementes não encontram condições ideais de germinação. Objetivou-se avaliar, neste trabalho, o desempenho de sementes de soja com diferentes níveis de manchamento por Cercospora kikuchii e a eficiência de tratamentos com fungicidas, quando as sementes foram submetidas a déficit hídrico. Sementes foram selecionadas e classificadas quanto à intensidade de manchamento por C. kikuchii, em três categorias: sementes sem sintomas ou sem manchas (zero), sementes com 1 a 25% e com 26 a 50% da superfície manchada (mancha-púrpura). Em seguida, foram incubadas em meio de restrição hídrica por manitol e submetidas, ou não, a tratamentos com as misturas fungicidas thiabendazole+thiram e carbendazin+thiram. Em laboratório, procedeu-se à análise das sementes por meio dos testes de germinação, frio e de sanidade (Blotter). Ambos os tratamentos fungicidas não erradicaram Cercospora kikuchii quando as sementes se apresentaram com sintomas; entretanto, aumentaram o desempenho fisiológico das mesmas sob estresse hídrico. Em condições de déficit hídrico, durante a germinação, a incidência de manchamento por Cercospora kikuchii, em sementes de soja, aumenta a porcentagem de plântulas anormais infectadas. Palavras-chave adicionais:Glycine max; mancha-púrpura; tratamento químico. AbstractThe soybean seeds performance and the plants establishment in the field may be affected negatively by the contamination of the seeds with phytopatogens, especially under unfavorable conditions for seeds germination. The objective was to evaluate the soybean seeds performance with different stain purple levels and the fungicide treatment efficiency when the seeds are submitted to hydric deficit stress conditions. The seeds were selected and classified by staining intensity in: seeds without stains (zero), 1 to 25% and 26 to 50% of the seed surface with purple stain. The seeds were incubated in medium with hydric restriction using mannitol and treated or nottreated with thiabendazol + thiram and carbendazin + thiram fungicides mixtures. In the laboratory the physiologic conditions of the seeds were evaluated by germination, cold and sanity tests. Both chemical treatments did not eradicate the pathogen when the seeds presented high contamination level but they increased physiological performance of the soybean seeds under hydric stress. During germination under water stress conditions, the incidence of Cercospora kikuchii in soybeans increases the abnormal seedlings infected percentage.

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Efeito de Colletotrichum dematium var. truncata e Cercospora kikuchii na germinação de sementes de soja

Cited by 18 publications

References 8 publications

Biology, pathogenicity, and haplotype analyses of Colletotrichum cliviae: a novel soybean anthracnose agent in warm tropical areas

Biology, pathogenicity, and haplotype analyses of Colletotrichum cliviae: a novel soybean anthracnose agent in warm tropical areas

Effectiveness of essential oils in the treatment of Colletotrichum truncatum-infected soybean seeds

Sementes de soja infectadas por Cercospora kikuchii, sob déficit hídrico

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