Fitopatologia Brasileira最新文献_第8页

Hospedeiros Alternativos de Xanthomonas campestris pv. viticola

Fitopatologia Brasileira Pub Date : 2007-04-01 DOI: 10.1590/S0100-41582007000200012

A. R. Peixoto, R. D. L. R. Mariano, J. O. T. Moreira, Ivanise O. Viana

引用次数: 14

First report of Turnip mosaic virus in horseradish in Brazil 巴西辣根中发现芜菁花叶病毒首例报道

Fitopatologia Brasileira Pub Date : 2007-04-01 DOI: 10.1590/S0100-41582007000200013

M. Eiras, A. Chaves, A. Colariccio, C. M. Chagas

引用次数: 3

Efeito da temperatura e de regimes de luz no crescimento do micélio, germinação de conídios e esporulação de Stenocarpella macrospora e Stenocarpella maydis 温度和光照条件对大孢子窄心菌和maydis窄心菌菌丝生长、分生孢子萌发和产孢的影响

Fitopatologia Brasileira Pub Date : 2007-04-01 DOI: 10.1590/S0100-41582007000200007

R. T. Casa, E. M. Reis, L. Zambolim, É. N. Moreira

{"title":"Efeito da temperatura e de regimes de luz no crescimento do micélio, germinação de conídios e esporulação de Stenocarpella macrospora e Stenocarpella maydis","authors":"R. T. Casa, E. M. Reis, L. Zambolim, É. N. Moreira","doi":"10.1590/S0100-41582007000200007","DOIUrl":"https://doi.org/10.1590/S0100-41582007000200007","url":null,"abstract":"Mycelial growth, spore germination and sporulation (production of cirri) of Stenocarpella macrospora and S. maydis were evaluated under temperatures ranging from 5 oC to 45 oC and under different photoperiods. Monosporic isolates from each species of Stenocarpella from infected corn stalks, collected in the experimental area of the University of Passo Fundo RS, were used throughout this work. Temperature range between 23 and 28 oC allowed the fastest mycelial growth for two isolates, both under continuous light and under 12 h photoperiod. No mycelial growth was observed at 5 oC and 45 oC for either isolate. Mycelium of both isolates grew faster under a photoperiod of 12 h. Conidia of both fungi did not germinate even after 24 h of incubation at 5 and 45 oC, independently of photoperiod. The highest proportion of conidial germination of the isolate of S. maydis was observed between 28 and 33 oC. On the other hand, conidia of S. macrospora germinated under lower temperature range than S. maydis. Conidia of both species germinated faster in the presence of light. For both isolates, sporulation on corn stalk segments was highest at temperatures ranging from 30 to 35 oC under continuous light.","PeriodicalId":211183,"journal":{"name":"Fitopatologia Brasileira","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114771564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Obtenção de bactérias para a o biocontrole de Meloidogyne javanica por meio de aquecimento de solo e tratamento com filtrado de raízes de plantas antagonistas a fitonematóides 通过加热土壤和过滤处理植物拮抗类植物根，获得对爪牙根结线虫生物防治的细菌

Fitopatologia Brasileira Pub Date : 2007-02-01 DOI: 10.1590/S0100-41582007000100013

Cleiaf S. Fabry, L. G. Freitas, W. S. Neves, M. M. Coutinho, M. R. Tótola, José Rogério de Oliveira, R. Dallemole-Giaretta, S. Ferraz

{"title":"Obtenção de bactérias para a o biocontrole de Meloidogyne javanica por meio de aquecimento de solo e tratamento com filtrado de raízes de plantas antagonistas a fitonematóides","authors":"Cleiaf S. Fabry, L. G. Freitas, W. S. Neves, M. M. Coutinho, M. R. Tótola, José Rogério de Oliveira, R. Dallemole-Giaretta, S. Ferraz","doi":"10.1590/S0100-41582007000100013","DOIUrl":"https://doi.org/10.1590/S0100-41582007000100013","url":null,"abstract":"Five samples of 1 kg each of organic soil (10.14 dag/kg) were autoclaved at 120 °C for 1 hour, five were heated in a 660 watt and 2450 Hz microwave oven at full power for 4 min, and five were not heat-treated. Roots of Mucuna aterrima, Crotalaria juncea, Tagetes erecta and Lycopersicon esculentum were macerated, separately, in 1000 ml of tap water in a blender at low speed for 30 s, then sieved. Each of the resulting suspensions or just tap water (control treatment) was poured on one of the different soil samples inside a plastic bag and stored at 28 °C for 24 h. Seventy-eight bacterial isolates were obtained from the soil samples by serial dilution and selected for a subsequent assay for the biocontrol of Meloidogyne javanica. Tomato seeds were soaked in suspension of each bacterial isolate, then sowed in substrate inside plastic tubes in the greenhouse. The seedlings were each inoculated with 400 eggs of the nematode. The isolate UFV-6 of Escherichia coli reduced the number of galls to the highest extent (80%), and UFV-8 of Citrobacter freundii was the most effective in reducing number of eggs (83%). The identification of the isolates was done by fatty acid analyses and biochemical tests.","PeriodicalId":211183,"journal":{"name":"Fitopatologia Brasileira","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126376904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Caracterização de um isolado do Sugarcane mosaic virus que quebra a resistência de variedades comerciais de cana-de-açúcar 甘蔗花叶病毒分离株的特性，破坏甘蔗商品品种的抗性

Fitopatologia Brasileira Pub Date : 2007-02-01 DOI: 10.1590/S0100-41582007000100004

M. C. Gonçalves, Amaury S. Santos, I. G. Maia, C. M. Chagas, R. Harakava

{"title":"Caracterização de um isolado do Sugarcane mosaic virus que quebra a resistência de variedades comerciais de cana-de-açúcar","authors":"M. C. Gonçalves, Amaury S. Santos, I. G. Maia, C. M. Chagas, R. Harakava","doi":"10.1590/S0100-41582007000100004","DOIUrl":"https://doi.org/10.1590/S0100-41582007000100004","url":null,"abstract":"Viruses in the Sugarcane mosaic virus (SCMV, genus Potyvirus, family Potyviridae), subgroup cause mosaic in different botanical species in the subfamily Panicoideae (family Poaceae). However, only SCMV and Sorghum mosaic virus (SrMV) naturally infect sugarcane. In Brazil, SCMV seems to be the only causal agent of mosaic in sugarcane. Most sugarcane cultivars are believed to be resistant to mosaic, although new cases have been reported in the field. Symptomatic samples, from several clones and cultivars, were collected in sugarcane crops. Among these cultivars, RB72-454, one of the most grown in Brazil, and considered resistant, showed plants with mosaic symptoms. Samples were tested by DAS-ELISA with antisera to SCMV, Johnsongrass mosaic virus (JGMV) and Maize dwarf mosaic virus (MDMV), showing negative results. However, sorghum \"Rio\" and \"TX2786\" showed mosaic symptoms when mechanically inoculated with the viral isolates, indicating infection by SCMV. Total RNA was extracted and submitted to amplification with specific primers to SCMV and SrMV in RT-PCR. Specific bands with ca. 880 bp were amplified with the SCMV-specific primer pair, corroborating results from mechanical inoculation. PCR products were cloned and sequenced. One of the SCMV isolates comprises a new and more severe strain capable of infecting RB72-454 and other tolerant cultivars in the field.","PeriodicalId":211183,"journal":{"name":"Fitopatologia Brasileira","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131322127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Efeito de Substratos sobre a Germinação de Uredosporos e Comprimento de Tubos Germinativos de Puccinia triticina 基质对小豆蔻尿道孢子萌发和发芽管长度的影响

Fitopatologia Brasileira Pub Date : 2007-02-01 DOI: 10.1590/S0100-41582007000100012

E. M. Reis, Rudinei L. Richter

引用次数: 7

Virulence and rep-PCR analysis of Pyricularia grisea isolates from two Brazilian upland rice cultivars 两个巴西旱稻品种稻瘟病菌分离株的毒力及pcr分析

Fitopatologia Brasileira Pub Date : 2007-02-01 DOI: 10.1590/S0100-41582007000100002

A. Prabhu, L. G. Araújo, G. Silva, M. D. G. Trindade

{"title":"Virulence and rep-PCR analysis of Pyricularia grisea isolates from two Brazilian upland rice cultivars","authors":"A. Prabhu, L. G. Araújo, G. Silva, M. D. G. Trindade","doi":"10.1590/S0100-41582007000100002","DOIUrl":"https://doi.org/10.1590/S0100-41582007000100002","url":null,"abstract":"The phenotypic and genetic diversity of 77 isolates of Pyricularia grisea collected from two upland rice cultivars, Maravilha and Primavera, was studied. Isolates exhibiting compatible reaction to cv.Primavera were incompatible to cv.Maravilha and vice versa, with the exception of six isolates that were compatible to both cultivars. The virulence of isolates from cv. Maravilha on 32 test genotypes of rice was significantly higher (t = 9.09, p < 0.0001) than the isolates from cv.Primavera. A phenogram constructed from virulence data showed two main groups, one constituted mainly of isolates from cv.Primavera (97.6%) and the other of isolates from cv.Maravilha (91.17%). Rep-PCR analysis of isolates using two primers designed from sequences of Pot2 showed that isolates could be clustered broadly into two groups. The average similarity within a cluster of isolates from cv.Primavera was significantly greater than the average similarity among the isolates of cv.Maravilha (t = 5.37, p < 0.0001). There was close correspondence between clusters based on PCR and virulence data (r = 0.48, p < 0.011). The results showed that isolates of P. grisea were cultivar specific and had low phenotypic and genetic diversity.","PeriodicalId":211183,"journal":{"name":"Fitopatologia Brasileira","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128627604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Variabilidade fisiológica em populações de Meloidogyne paranaensis 根结线虫种群的生理变异性

Fitopatologia Brasileira Pub Date : 2007-02-01 DOI: 10.1590/S0100-41582007000100005

A. D. Roese, R. L. Oliveira, Dagoberto S. Oliveira

引用次数: 4

Controle biológico de Monosporascus cannonballus com Chaetomium 毛囊体单孢子虫的生物防治

Fitopatologia Brasileira Pub Date : 2007-02-01 DOI: 10.1590/S0100-41582007000100011

R. S. Júnior, R. Beltrán, Antonio Vicent, Josep Armengol, J. García-Jiménez, É. V. D. Medeiros

{"title":"Controle biológico de Monosporascus cannonballus com Chaetomium","authors":"R. S. Júnior, R. Beltrán, Antonio Vicent, Josep Armengol, J. García-Jiménez, É. V. D. Medeiros","doi":"10.1590/S0100-41582007000100011","DOIUrl":"https://doi.org/10.1590/S0100-41582007000100011","url":null,"abstract":"Melon collapse caused by Monosporascus cannonballus is one of the main diseases that affect this cucurbit. The objective of this research was to study the biological control of M. cannonballus by Chaetomium. Infested substrates with 0.5, 1, 2, 4 and 8 x 105 CFU g-1 were introduced in plates where seeds of melon type Piel de Sapo cv. PS 1430 were sowed in seeding trays after two weeks of incubation. The seedlings were transplanted to pots with a similar substrate, infested additionally with 2.5 x 104 CFU of Chaetomium per gram and 20 CFU of M. cannonballus per gram of substrate. Three controls were considered: one infested with Chaetomium alone, another with M. cannonballus and one without any treatment. The experimental design was completely randomized with five replicates. General disease index and control percentage were evaluated forty-five days after transplant. The General disease index varied according to the increased Chaetomium concentration. The results demonstrated that 4 and 8 x 105 CFU of Chaetomium g-1 were equivalent to 0.9 and 0.6, respectively. The statistical analysis showed that 4 and 8 x 105 CFU g-1 of Chaetomium concentration were the most efficient treatments, with control percentage higher than 55 %, indicating the potential of Chaetomium to control M. cannonballus.","PeriodicalId":211183,"journal":{"name":"Fitopatologia Brasileira","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133684432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Scytalidium lignicola causando manchas em folhas, hastes e frutos de baunilha 木蠹蛾在香草叶、茎和果实上造成斑点

Fitopatologia Brasileira Pub Date : 2007-02-01 DOI: 10.1590/S0100-41582007000100015

J. R. Verzignassi, L. S. Poltronieri, R. Benchimol, M. F. Moura

引用次数: 5