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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Item Associação de Pseudomonas syringae pv. garcae com algumas características agronômicas em cafeeiros F2 segregantes para o gene erecta(Editora UFLA, 2004-09) Sera, Gustavo Hiroshi; Sera, Tumoru; Altéia, Marcos Zorzenom; Androcioli Filho, Armando; Azevedo, José Alves de; Petek, Marcos Rafael; Ito, Dhalton ShiguerA bacteriose causada pela Pseudomonas syringae pv. garcae provoca grandes prejuízos em algumas regiões da cafei- cultura brasileira, como Paraná, São Paulo e Minas Gerais, principalmente em lavouras novas, podadas e expostas ao vento. Com este trabalho, objetivou-se estudar nas plantas F 2 do cruzamento entre os genótipos IAPAR-59 e Catuaí Erecta a associação entre as características vigor vegetativo e ângulos de inserção das ramificações plagiotrópicas sobre a intensidade de ocorrência da bacteriose. Avaliaram-se, em outubro de 2001, 316 plantas F 2 plantadas no IAPAR de Londrina em outubro de 1998. A escala de notas de avaliação da incidência de bacteriose adotada foi de 1 a 5, sendo 1 = plantas sem lesão e 5 = plantas com muitas lesões. As notas de vigor vegetativo adotadas foram de 1 a 5, sendo 1 para folhas de coloração verde-claras e 5 para folhas verde- escuras. Para a inserção dos ramos plagiotrópicos sobre os ortotrópicos, as notas variaram de 1 a 3, sendo 1 = normal (45 a 70o), 2 = semi-ereta (25 a 40o) e 3 = ereta (5 a 20o). Estimou-se o coeficiente de correlação de Pearson para verificar a associação entre as características vigor vegetativo e do ângulo de inserção das ramificações plagiotrópicas com a intensidade de ocorrência da bacteriose nos cafeeiros. A correlação estimada entre a intensidade da bacteriose com o ângulo de inserção dos ramos plagiotrópicos foi de r = + 0,2087**. Não houve correlação significativa entre a bacteriose e o vigor vegetativo. Assim, plantas com ramificação plagiotrópica ereta são predispostas a uma maior incidência de bacteriose.Item Coffee berry borer resistance in coffee genotypes(Instituto de Tecnologia do Paraná - Tecpar, 2010-03) Sera, Gustavo Hiroshi; Sera, Tumoru; Ito, Dhalton Shiguer; Ribeiro Filho, Claudionor; Villacorta, Amador; Kanayama, Fabio Seidi; Alegre, Clayton Ribeiro; Grossi, Leandro DelThe aim of this study was to evaluate the coffee germplasm of the Paraná Agronomic Institute (IAPAR) for resistance to the coffee-berry-borer. Preliminary field evaluation was performed in August 2004 and the fruits of less damaged genotypes in the field were evaluated under controlled condition with obligated and free choice experiments established in a randomized complete design with three replications. The genotypes were evaluated fifteen days after infestation with one borer per fruit in Petri dishes. The data were analyzed by the Scott-Knott means test at 1 % and by the χ 2 test. Statistical analysis indicated that Coffea kapakata, Psilanthus bengalensis, C. eugenioides and genotypes with C. eugenioides genes were resistant. These genotypes presented low frequency of bored grains. C. eugenioides and C. kapakata could present resistance at epicarp level but not in the grain. P. bengalensis could present resistance also in the grains.Item Resistance to leaf rust in coffee carrying SH3 gene and others SH genes(Instituto de Tecnologia do Paraná - Tecpar, 2007-09) Sera, Gustavo Hiroshi; Sera, Tumoru; Ito, Dhalton Shiguer; Azevedo, José Alves de; Mata, João Siqueira da; Dói, Deisy Saori; Ribeiro Filho, Claudionor; Kanayama, Fabio SeidiThe aim of this work was to evaluate the resistance to rust in coffee carrying SH3 gene and other SH genes. Twenty one CIFC’s coffee trees with several resistance genes SH were evaluated in field conditions. All the evaluated coffees carrying SH3 gene presented resistance to the rust. It was possible that rust races with the virulence gene v3 in the Paraná State didn’t exist. The SH3 gene in combination with genes SH5, SH6, SH7, SH8, SH9 and SH? would be very important to obtain cultivars with more durable resistance to the rust.Item Partial resistance to fruit necrosis associated to Colletotrichum spp. among arabic coffee genotypes(Instituto de Tecnologia do Paraná - Tecpar, 2007-05) Sera, Gustavo Hiroshi; Sera, Tumoru; Ito, Dhalton Shiguer; Azevedo, José Alves de; Ribeiro Filho, Claudionor; Mata, João Siqueira daThe aim of this study was to evaluate the resistance to fruit necrosis associated to Colletotrichum spp. in Coffea arabica L.. Twenty-two arabic coffee genotypes were performed in a randomized block design, with three replications and ten plants per plot. They were evaluated for the variables fruit necrosis, luminosity index inside of the plant canopy and fruits per productive nodes of the plants. There was genetic variability for the resistance to fruit necrosis. Different partial resistance levels, varying from highly susceptible (score = 3.89) to moderately resistant (score = 1.77) were observed. The genotypes that presented moderate resistance were the cultivars IPR- 100, IPR-103, IPR-105 and IPR-108 and the coffee selection IAPAR-00023.