Relação entre níveis de inóculo de Colletotrichum gossypii var. cephalosporioides nas sementes e o progresso da ramulose do algodoeiro

Araújo, Dejânia Vieira de; Pozza, Edson Ampélio; Machado, José C.; Zambenedetti, Elisandra Batista; Carvalho, Enia Mara de; Celano, Fabiane A. O.

doi:10.1590/s0100-41582006000200004

Cited by 9 publications

(12 citation statements)

References 3 publications

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“…The increase in the pathogen incidence on inoculated seeds through all inoculum potentials proved the efficiency of this methodology which allowed the presence of the pathogen in high levels in seeds. Accordingly, similar results and observations from other papers support this as the most appropriate technique (Teixeira and Machado, 2003;Teixeira et al, 2005;Araújo et al, 2006;Sousa et al, 2008).…”

Section: Resultssupporting

confidence: 87%

“…Additionally, the authors reported the increase of the DI in both desinfected and non desinfected seeds after inoculation. On the other hand, Araújo et al (2006), evaluating the pathosystem C. gossypii South. var.…”

Section: Resultsmentioning

confidence: 99%

“…cephalosporioides (Araújo et al, 2006). In contrast, different results were observed by Teixeira and Machado (2003), in which the effect of the priming (osmotic restriction) and exposure time increased the ESI for corn seedlings from seeds inoculated with A. strictum, and the highest values were observed at the points of 72 and 120 h. This stimulation at the speed of emergence was also observed by Carvalho (1999), in which the solute mannitol added to the culture medium of -1.0 MegaPascal (MPa) for up to 120 h, caused a priming effect, stimulating the emergence of bean seedling.…”

Section: Resultsmentioning

confidence: 99%

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Transmission and effects of Fusarium oxysporum f. sp. vasinfectum on cotton seeds

Araújo¹,

Machado²,

Pedrozo³

et al. 2016

Afr. J. Agric. Res.

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This paper aimed to evaluate the transmission of Fusarium oxysporum f. sp. vasinfectum (FOV) and the effects of this pathogen on the initial development of cotton plants following inoculation of seeds. Two cultivars (susceptible and resistant) and two strains (most and least aggressive) of the pathogen were used in this study. The inoculation method was based on the contact between seeds and fungal colonies on substrates containing mannitol. Percentage of FOV in seeds and the percentage of seed germination were evaluated by blother test and germination test, after inoculation. Emergence of seedlings and speed index, initial and final stands, size and dry weight of the plants were verified in trays containing soil substrate. Disease severity, pathogen transmission and plant infection, from seed to plant, were determined in separate trial on plants. Occurrence of the pathogen was higher when inoculum potential was increased for all variables analyzed. The number of normal seedlings, determined by seed germination test, decreased when the incidence of the pathogen in the seed was increased. The same occurred to other variables, in which there was difference between cultivars where IAC 20-233 presented the best performance. No significant differences were found between strains for emergence speed index, initial and final stands variables. Transmission and infection rates were increased according to the inoculum potentials increasing and the maximum pathogen transmission rate, from seed to plant was around 50%.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Transmission and effects of Fusarium oxysporum f. sp. vasinfectum on cotton seeds

Araújo¹,

Machado²,

Pedrozo³

et al. 2016

Afr. J. Agric. Res.

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“…cephalosporioides A. S. Costa, respectively, are widespread diseases of cotton with high potential to severely reduce yields (LIMA et al, 1985;TANAKA, 1995). Moreover, the amount of inoculum of both pathogens on cotton seeds influences the disease progress at variable levels of incidence and inoculum severity (ARAÚJO et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Variability of seed-borne Colletotrichum strains in cotton based on ITS1 and ITS2 ribossomal genes analysis

Carvalho¹,

Figueira²,

Machado³

et al. 2015

Biosci. J.

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ABSTRACT:The use of DNA sequences analysis has been an important mean to distinguish and to identify populations of organisms at different levels. By molecular markers several complex organisms have been successful detected in plants for distinct aims. Ribosomal DNA (rDNA) has been used to evaluate genetic variability, microorganism phylogeny and to develop specific primers for detection of plant pathogens in plant tissues. In this study, the objective was to characterize isolates of Colletotrichum gossypii var. cephalosporioides and Colletotrichum gossypii, collected in different regions of Brazil, by analyzing the nucleotide sequence of rDNA regions. ITS1, ITS2, and the intervening 5.8S gene were amplified by PCR and their sequences compared to each other and to those from other species registered in the GenBank. The rDNA of isolates associated with Gossypium spp. showed sequence identities ranging from 96 to 100% in the ITS1 region, 98 to 100% in the 5.8S gene, and 97 to 100% in the ITS2 region. The sequences were submitted to UPGMA analysis, and according to the phylogenetic trees, the C. gossypii var. cephalosporioides and C. gossypii species clustered together along with isolates of Glomerella cingulata from mango and papaya, and thus no distinction could be made between isolates of those organisms.

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“…Além disso, o resultado dessas observações pode auxiliar no estabelecimento de padrões de tolerância para patógenos associados às sementes (Bergamin Filho et al, 2004;Alves et al, 2006;Araújo et al, 2006b;Araújo et al, 2009).…”

Section: Introductionunclassified

Progresso da ramulose em campo a partir de sementes de algodoeiro inoculadas com Colletotrichum gossypii var. cephalosporioides

Araújo¹,

Zambenedetti²,

Dallacort³

et al. 2012

Trop. plant pathol.

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RESUMOObjetivou-se avaliar a severidade e o progresso da ramulose no campo a partir de diferentes tempos de exposição das sementes de algodoeiro ao fungo Colletotrichum gossypii var. cephalosporioides. O experimento foi conduzido com cinco tratamentos e quatro repetições. Os tratamentos foram compostos por parcelas contendo 5% de sementes inoculadas nos tempos 0, 36, 72, 96 e 108 h de exposição ao patógeno. As avaliações foram feitas dos 46 dias até os 111 dias após a semeadura e os dados transformados para área abaixo da curva de progresso da incidência (AACPI) e da severidade (AACPS) da doença. Observou-se que a incidência de C. gossypii var. cephalosporioides cresceu de acordo com o aumento do tempo de exposição das sementes ao patógeno, chegando a 99% de incidência no tempo 108 h. Por outro lado, houve redução na germinação das sementes conforme o aumento no tempo de exposição, de 99%, no tempo 36 horas, para 92%, no tempo 108 horas. A AACPI e a AACPS da doença foram maiores com o aumento do tempo de exposição das sementes ao patógeno, observando-se o progresso da incidência (93,1%) e da severidade (42,5%) no maior tempo de exposição das sementes (108 h) em relação à testemunha. Palavras-chave: Gossypium hirsutum, inoculação de sementes, sanidade de sementes. ABSTRACT Progress of cotton ramulosis in the field after disease establishment through inoculation of seeds with Colletotrichum gossypii var. cephalosporioidesThe objective of this study was to evaluate the severity and the progress of ramulosis in the field after disease establishment through inoculation of cotton seeds with Colletotrichum gossypii var. cephalosporioides. The assay was carried out with five treatments and was replicated four times. The treatments consisted of plots with 5% of infected seeds that were inoculated through periods of exposure of seeds to the pathogen of 0, 36, 72, 96 and 108 h. Evaluations were made from 46 to 111 days after sowing and the data were transformed to area under the disease incidence progress curve (AUDPCI) and severity (AUDPCS). The incidence of ramulosis increased with increasing length of exposition of the seeds to the pathogen, reaching 99% of incidence at 108 h. On the other hand, a reduction in the percentage of seed germination was observed when the exposition time increased. Seed germination dropped from 99% at 36 h to 92% at 108 h. The AUDIPC and AUDSPC were influenced by the length of seed exposition to the pathogen. The higher progress of the incidence (93.1%) and of the severity (42.5%) occurred at 108 h. Key words: Gossypium hirsutum, seed health, seed inoculation. INTRODUçãOO Brasil está entre os maiores produtores de algodão (Gossipium hirsutum L.) do mundo. Assim como as demais culturas exploradas comercialmente, a do algodoeiro está sujeita à incidência de um elevado número de doenças, cujos patógenos são, em sua maioria, transportados e/ou transmitidos por sementes. Por meio dessa via, inúmeros patógenos de importância econômica podem ser disseminados a longas distâncias e causar prejuízos co...

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Relação entre níveis de inóculo de Colletotrichum gossypii var. cephalosporioides nas sementes e o progresso da ramulose do algodoeiro

Cited by 9 publications

References 3 publications

Transmission and effects of Fusarium oxysporum f. sp. vasinfectum on cotton seeds

Transmission and effects of Fusarium oxysporum f. sp. vasinfectum on cotton seeds

Variability of seed-borne Colletotrichum strains in cotton based on ITS1 and ITS2 ribossomal genes analysis

Progresso da ramulose em campo a partir de sementes de algodoeiro inoculadas com Colletotrichum gossypii var. cephalosporioides

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