Caracterização de isolados de Phytophthora infestans do Distrito Federal e de Goiás

Reis, Ailton; Ribeiro, Fabiana H. S.; Mizubuti, Eduardo S. G.

doi:10.1590/s0100-41582006000300005

Cited by 8 publications

(9 citation statements)

References 28 publications

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“…We believe that was due Foliage maturity type Frequency (nº ofcultivars) Fig. 4 Relationship between resistance to foliar late blight in potato and foliage maturity type for the cultivars evaluated in experiments 1, 2 and 3 several reasons: a) oospores of P. infestans were not detected in Brazil (Reis et al 2006), b) the sporangia were not able to cause symptoms on tubers due to low survival in the soil, c) precipitation during the late blight epidemic in the three experiments was very low and perhaps the only irrigation was not sufficient to lead large amount of inoculum to the ground, d) the experiments were carried in clay soil (50, 58 and 58% of clay for experiments 1, 2 and 3, respectively) which are unfavorable conditions to the development of symptoms of late blight on tubers, and e) the experiments were not done in commercial potato fields, where there are many crops by year. Late blight in tuber is not important for Brazil conditions and potato tuber is not considered as an important inoculum source of P. infestans.…”

Section: Discussionmentioning

confidence: 99%

The field resistance of potato cultivars to foliar late blight and its relationship with foliage maturity type and skin type in Brazil

Duarte

Zambolim

Mizubuti

et al. 2011

Australasian Plant Pathol.

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The use of resistant cultivars is the preferred control method for plant diseases. This approach is attractive owing to its high efficacy, low cost, and ease of implementation. This work aimed to assess the resistance of potato cultivars to foliar late blight (Phytophthora infestans) under different environmental conditions. It further aimed to assess the relationships between resistance to foliar late blight and foliage maturity type and between resistance to foliar late blight and the skin type of the potato. Three experiments were performed in two different regions of the state of Minas Gerais with different environmental conditions. The first and second experiments used 34 cultivars (treatments). The third experiment used 17 cultivars. The severity of foliar late blight in each plot was quantified every 2 days using a descriptive scale. The values of the epidemiological variables were then calculated. The proposed levels of resistance to foliar late blight were defined as: resistant (R), moderately resistant (MR), moderately susceptible (MS) and susceptible (S). The majority of potato cultivars were susceptible to foliar late blight. The resistance levels of some cultivars to foliar late blight used in these experiments changed according to the pathogen population and environmental conditions. The cultivars with the highest levels of resistance to foliar late blight (resistant and moderately resistant) were later maturity. Most cultivars that have been classified as moderately susceptible or susceptible were earlier maturity. In general, cultivars that are more resistant to foliar late blight had a rougher skin, whereas the skins of the more susceptible cultivars had smoother.

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Section: Discussionmentioning

confidence: 99%

The field resistance of potato cultivars to foliar late blight and its relationship with foliage maturity type and skin type in Brazil

Duarte

Zambolim

Mizubuti

et al. 2011

Australasian Plant Pathol.

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“…Segundo Vida et al, 2004 em cultivo protegido pode haver maior incidência de pragas e doenças em decorrência da temperatura elevada, alta umidade relativa do ar e do solo, maior salinização do solo, toxidez e menor número de inimigos naturais. Além disso, algumas cultivares e híbridos de tomateiro apresentam susceptibilidade á requeima (VALE et al, 2007;REIS et al, 2006), podendo ser este o motivo da baixa produtividade da variedade IPA 6 nessas condições.…”

Section: Cultivaresunclassified

“…Este comportamento pode ser explicado devido à alta incidência da requeima (Phytophthora infestans), e aos danos causados pela broca pequena do fruto (Neuleucinoides elegantalis), que apesar de não ser objetivo de avaliação desta pesquisa, visualmente essa cultivar foi muito atacada. As variedades e híbridos de tomateiro cultivado no Brasil são suscetíveis à requeima (REIS et al, 2006), e nem todos os genótipos com boas características agronômicas e comerciais apresentam nível satisfatório de resistência à requeima (FIORINI et al, 2010). Resultados contrários foram identificados por Caliman et al (2005) que obtiveram produtividade total de frutos superior quando cultivados sob ambiente protegido em comparação ao cultivo em campo, destacando o híbrido em relação aos demais genótipos testados, no entanto, utilizaram alta doses de fertilizantes químicos e controle de pragas e doenças com agrotóxicos sintéticos.…”

Section: Cultivaresunclassified

Produtividade de tomate orgânico cultivado em diferentes ambientes e níveis de insumos

et al. 2016

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Resumo: A importância alimentar do tomate orgânico aliado a sua baixa produção na Amazônia e a necessidade de baixo uso de insumos para seu cultivo ecológico o objetivo deste trabalho foi avaliar a produtividade de cultivares de tomate orgânico cultivado em campo e ambiente protegido com alto e baixo nível de insumos. Os experimentos foram conduzidos em ambiente protegido e campo, ambos no delineamento em blocos casualizados completos, em esquema de parcelas subdivididas 2 x 3, sendo a parcela principal composta por dois níveis de insumos e a subparcela pelas cultivares copa (Santa Kruz Kada, IPA 6 e Santa Clara), com cinco repetições de cinco plantas cada. As variáveis avaliadas foram: massa média de frutos total e comercial (g fruto -1), número de frutos total e comercial por planta, produtividade total e comercial de frutos (kg ha -1 ). A cultivar IPA 6 em cultivo protegido exigiu maior uso de insumos para aumentar a massa média de fruto total e comercial, produtividade total e comercial, em campo pode se utilizar baixo nível de insumo. O alto uso de insumos é necessário para aumentar a produtividade total e comercial para a cv. Santa Clara em cultivo à campo, ambiente que também necessita de alto uso de insumos para aumentar a massa média de fruto total e comercial a produtividade comercial da cultivar Santa Kruz. Palavras-chave: Lycopersicon esculentum; cultivo orgânico; cultivo protegido. Abstract:The importance of organic tomato feed associated with their low production in the Amazon and the need for low input to its ecological farming the objective of this study was to evaluate the productivity of organic tomato cultivars grown in field and greenhouse with high and low level inputs. The experiments were conducted under greenhouse and field conditions, both in randomized complete block design comprising plots subdivided into subplots. The plots encompassed of two levels of inputs, while the subplots contained the (Santa Kruz Kada, 6 and IPA Santa Clara), with five replicates of five plants each. The variables evaluated were: total fruit mass and marketable fruit mass (g fruit -1), number of total and marketable fruit per plant, total and marketable fruit yield (kg ha -1 ). The cultivar IPA 6 in greenhouse demanded greater use of inputs to increase the total and marketable fruit mass, total and marketable yield in field can be used for low level input. The high use of inputs is necessary to increase the total and marketable yield for cv. Santa Clara in the growing field, environment which also requires high use of inputs to increase the total and marketable fruit mass, marketable fruit yield of cultivar Santa Kruz.

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“…Brommonschenkel, 1988, MSc thesis, Univ. Federal de Vicosa, Brazil; Reis et al 2003Reis et al , 2006. Only strains of group A1, classified as the US-1 clonal lineage, were found associated with tomato crops.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Phytophthora infestans populations of southern Brazil in 2004 and 2005

et al. 2013

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The populations of Phytophthora infestans (Pi) in southern Brazil in 2004 and 2005 are characterized herein. The isolates were collected from potato and tomato plants in the states of Paraná (PR), Santa Catarina (SC), and Rio Grande do Sul (RS). The mating type of 131 potato and 32 tomato isolates was determined. Forty-nine isolates from potatoes and 11 from tomatoes were analyzed for their Gpi phenotype. A subset of 35 isolates was evaluated for mitochondrial (mtDNA) polymorphisms. A sample of 146 isolates was tested for sensitivity to the fungicide metalaxyl, and most isolates (64%) were moderately sensitive. Fiftynine isolates were classified as A1 mating type and 103 as A2. One isolate behaved as both A1 and A2 mating type. All tomato isolates were A1 mating type and presented the 86/100 pattern for the enzyme GPI and mtDNA Ib, indicating that these isolates belong to the US-1 clonal lineage. Of the 131 potato isolates, 103 were A2, 27 were A1 and one was A1/A2 mating type. Among the potato isolates 27 exhibited the Gpi phenotype 100/100, the same as BR-1, and 20 were 86/100, the same as US-1. Potato isolates presented the mitochondrial haplotypes Ia (74%) and IIa (26%). The data suggest the presence of only the BR-1 clonal lineage on potatoes in the states of PR and SC. However, in the state of RS, more than one clonal lineage was observed infecting potatoes, and there may be sexual reproduction between the lineages.

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Caracterização de isolados de Phytophthora infestans do Distrito Federal e de Goiás

Cited by 8 publications

References 28 publications

The field resistance of potato cultivars to foliar late blight and its relationship with foliage maturity type and skin type in Brazil

The field resistance of potato cultivars to foliar late blight and its relationship with foliage maturity type and skin type in Brazil

Produtividade de tomate orgânico cultivado em diferentes ambientes e níveis de insumos

Characterization of Phytophthora infestans populations of southern Brazil in 2004 and 2005

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