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Selection for durable resistance to leaf rust using test-crosses on IAPAR-59 and Tupi IAC 1669-33 cultivars of Coffea arabica

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dc.contributor.author Sera, Gustavo Hiroshi
dc.contributor.author Sera, Tumoru
dc.contributor.author Ito, Dhalton Shiguer
dc.contributor.author Azevedo, José Alves de
dc.contributor.author Mata, João Siqueira da
dc.contributor.author Doi, Deisy Saori
dc.contributor.author Ribeiro Filho, Claudionor
dc.date.accessioned 2019-11-08T12:46:55Z
dc.date.available 2019-11-08T12:46:55Z
dc.date.issued 2007-07
dc.identifier.citation SERA, G. H. et al. Selection for durable resistance to leaf rust using test-crosses on IAPAR-59 and Tupi IAC 1669-33 cultivars of Coffea arabica. Brazilian Archives of Biology and Technology, Curitiba, v. 50, n. 4, p. 565-570, jul. 2007. pt_BR
dc.identifier.issn 1678-4324
dc.identifier.uri http://dx.doi.org/10.1590/S1516-89132007000400001 pt_BR
dc.identifier.uri http://www.sbicafe.ufv.br/handle/123456789/12381
dc.description.abstract The aim of this study was to identify plants of the IAPAR-59 and Tupi IAC 1669-33 coffee cultivars with less defeated resistance genes by the rust races present at IAPAR (Londrina, Paraná State, Brazil) using test-crosses. Eighteen test-crosses derived from hybridizations between ‘IAPAR-59’ or ‘Tupi IAC 1669-33’ with susceptible coffee to the rust disease were evaluated. Six hybrids were used as susceptible standards originated from hybridizations between two susceptible coffee plants. Many parental plants of the ‘IAPAR-59’ and ‘Tupi IAC 1669- 33’ presented more defeated resistance genes against rust races present at IAPAR than others of these cultivars or the genes were in heterozygous, because of segregant susceptible plants observed in some test-crosses. The test- crosses were very efficient to identify plants with less defeated resistance genes to the H. vastatrix. Coffee plants considered resistants would must be made test-crosses to verify which plants presented less and/or more defeated genes in homozygous. pt_BR
dc.description.abstract A ferrugem é uma das principais doenças do café. O objetivo deste trabalho foi identificar plantas das cultivares IAPAR-59 e Tupi IAC 1669-33 com menos genes de resistência quebrados às raças de ferrugem presentes no IAPAR (Londrina, Paraná, Brasil) através de cruzamentos testes. Foram avaliados 18 cruzamentos testes derivados dos cruzamentos de ‘IAPAR-59’ ou ‘Tupi IAC 1669- 33’ com cafeeiros suscetíveis à ferrugem. Seis híbridos foram usados como testemunhas suscetíveis derivados do cruzamento de dois cafeeiros suscetíveis. Muitas plantas da ‘IAPAR-59’ e ‘Tupi IAC 1669-33’ apresentam mais genes de resistência quebrados pelas raças de ferrugem presentes no IAPAR do que outras dessas cultivares ou os genes estão em heterozigoze, pois foram observadas muitas plantas segregantes suscetíveis em alguns cruzamentos testes. Os cruzamentos testes são muito eficientes para selecionar plantas com menos genes de resistência à ferrugem quebrados. Em cafeeiros de cultivares considerados resistentes deveriam ser feitos cruzamentos testes para verificar quais plantas apresentam menos genes de resistência quebrados ou mais genes em homozigoze. pt_BR
dc.format pdf pt_BR
dc.language.iso en pt_BR
dc.publisher Instituto de Tecnologia do Paraná - Tecpar pt_BR
dc.relation.ispartofseries Brazilian Archives of Biology and Technology;v.50, n.4, p.565-570, 2007;
dc.rights Open Access pt_BR
dc.subject Hemileia vastatrix pt_BR
dc.subject Breeding pt_BR
dc.subject Coffee crop pt_BR
dc.subject Rust races pt_BR
dc.subject SH genes pt_BR
dc.subject.classification Cafeicultura::Genética e melhoramento pt_BR
dc.title Selection for durable resistance to leaf rust using test-crosses on IAPAR-59 and Tupi IAC 1669-33 cultivars of Coffea arabica pt_BR
dc.type Artigo pt_BR

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