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The Infection of Soybean Leaves by Phakopsora pachyrhizi during Conditions of Discontinuous Wetness
2010; Wiley; Volume: 159; Issue: 3 Linguagem: Inglês
10.1111/j.1439-0434.2010.01742.x
ISSN1439-0434
AutoresG. Q. Furtado, Sylvia Raquel Gomes Moraes, S. A. M. Alves, Lílian Amorim, Nelson Sidnei Massola Júnior,
Tópico(s)Plant Pathogens and Resistance
ResumoJournal of PhytopathologyVolume 159, Issue 3 p. 165-170 The Infection of Soybean Leaves by Phakopsora pachyrhizi during Conditions of Discontinuous Wetness Gleiber Quintão Furtado, Gleiber Quintão Furtado Authors' addresses: Departamento de Fitopatologia, Universidade Federal de Viçosa, Av. P.H. Rolfs s/n, CEP 36570-000, Vicosa, MG, BrazilSearch for more papers by this authorSylvia Raquel Gomes Moraes, Sylvia Raquel Gomes Moraes Departamento de Fitopatologia e Nematologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de Sao Paulo, Caixa Postal 09, CEP 13418-900, Piracicaba, SP, BrazilSearch for more papers by this authorSílvio André Meirelles Alves, Sílvio André Meirelles Alves Estação Experimental de Fruticultura Temperada, Embrapa Uva e Vinho, Rod. BR 285, Km 115, CEP 95200-000, Vacaria, RS, Brazil (correspondence to N. S. Massola Jr. E-mail: [email protected])Search for more papers by this authorLilian Amorim, Lilian Amorim Departamento de Fitopatologia e Nematologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de Sao Paulo, Caixa Postal 09, CEP 13418-900, Piracicaba, SP, BrazilSearch for more papers by this authorNelson Sidnei Massola Júnior, Nelson Sidnei Massola Júnior Departamento de Fitopatologia e Nematologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de Sao Paulo, Caixa Postal 09, CEP 13418-900, Piracicaba, SP, BrazilSearch for more papers by this author Gleiber Quintão Furtado, Gleiber Quintão Furtado Authors' addresses: Departamento de Fitopatologia, Universidade Federal de Viçosa, Av. P.H. Rolfs s/n, CEP 36570-000, Vicosa, MG, BrazilSearch for more papers by this authorSylvia Raquel Gomes Moraes, Sylvia Raquel Gomes Moraes Departamento de Fitopatologia e Nematologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de Sao Paulo, Caixa Postal 09, CEP 13418-900, Piracicaba, SP, BrazilSearch for more papers by this authorSílvio André Meirelles Alves, Sílvio André Meirelles Alves Estação Experimental de Fruticultura Temperada, Embrapa Uva e Vinho, Rod. BR 285, Km 115, CEP 95200-000, Vacaria, RS, Brazil (correspondence to N. S. Massola Jr. E-mail: [email protected])Search for more papers by this authorLilian Amorim, Lilian Amorim Departamento de Fitopatologia e Nematologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de Sao Paulo, Caixa Postal 09, CEP 13418-900, Piracicaba, SP, BrazilSearch for more papers by this authorNelson Sidnei Massola Júnior, Nelson Sidnei Massola Júnior Departamento de Fitopatologia e Nematologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de Sao Paulo, Caixa Postal 09, CEP 13418-900, Piracicaba, SP, BrazilSearch for more papers by this author First published: 22 September 2010 https://doi.org/10.1111/j.1439-0434.2010.01742.xCitations: 4 Departamento de Fitopatologia e Nematologia, Universidade de São Paulo, Brazil Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract The ability of Phakopsora pachyrhizi to cause infection under conditions of discontinuous wetness was investigated. In in vitro experiments, droplets of a uredospore suspension were deposited onto the surface of polystyrene. After an initial wetting period of either 1, 2 or 4 h, the drops were dried for different time intervals and then the wetness was restored for 11, 10 or 8 h. Germination and appressorium formation were evaluated. In in vivo experiments, soybean plants were inoculated with a uredospore suspension. Leaf wetness was interrupted for 1, 3 or 6 h after initial wetting periods of 1, 2 or 4 h. Then, the wetting was re-established for 11, 10 or 8 h, respectively. Rust severity was evaluated 14 days after inoculation. The germination of the spores and the formation of the appressoria on the soybean leaves after different periods of wetness were also quantified in vivo by scanning electron microscopy. P. pachyrhizi showed a high infective capacity during short periods of time. An interruption of wetness after 1 h caused average reductions in germination from 56 to 75% and in appressorium formation from 84 to 96%. Rust severity was lower in all of the in vivo treatments with discontinuous wetness when compared to the control plants. Rust severity was zero when the interruption of wetness occurred 4 h after the initial wetting. Wetting interruptions after 1 and 2 h reduced the average rust severity by 83 and 77%, respectively. The germination of the uredospores on the soybean leaves occurred after 2 h of wetness, with a maximum germination appearing after 4 h of wetness. Wetness interruption affected mainly the spores that had initiated the germination. References Alderman SC, Lacy ML, Everts KL. (1985) Influence of interruptions of dew period on numbers of lesion produced on onion by Botrytis squamosa. Phytopathology 75: 808– 810. 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