Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:39:43Z No. of bitstreams: 2 jorge_augusto_assis_gomes.pdf: 858179 bytes, checksum: 2c111fc5c350cc28b8f24139d36ec85c (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:40:52Z (GMT) No. of bitstreams: 2 jorge_augusto_assis_gomes.pdf: 858179 bytes, checksum: 2c111fc5c350cc28b8f24139d36ec85c (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:41:23Z (GMT) No. of bitstreams: 2 jorge_augusto_assis_gomes.pdf: 858179 bytes, checksum: 2c111fc5c350cc28b8f24139d36ec85c (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2014-12-22T13:41:23Z (GMT). No. of bitstreams: 2 jorge_augusto_assis_gomes.pdf: 858179 bytes, checksum: 2c111fc5c350cc28b8f24139d36ec85c (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2014 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) / Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) / A batata-doce [Ipomoea batatas (L.)], ? considerada uma planta r?stica, no entanto, ? suscet?vel a grande n?mero de pragas e doen?as. Os nematoides-das-galhas, Meloidogyne spp. est?o entre as pragas mais destrutivas da cultura da batata-doce. S?o necess?rios trabalhos que explorem a variabilidade gen?tica existente na esp?cie para se obter clones resistentes a esse fitopat?geno. O objetivo deste trabalho foi avaliar clones de batata-doce quanto ? resist?ncia aos nematoides-das-galhas. Foram conduzidos tr?s experimentos independentes em casa de vegeta??o para testar a resist?ncia dos clones de batata-doce quanto aos nematoides formadores de galhas, no per?odo de novembro de 2012 a maio de 2013. Foram avaliados 63 clones no delineamento experimental de blocos completos casualizados, com tr?s repeti??es e seis plantas por parcela. Utilizaram-se in?culos de Meloidogyne incognita ra?a1, Meloidogyne incognita ra?a 3 e Meloidogyne javanica. A classifica??o dos n?veis de resist?ncia foi realizada de acordo com o fator de reprodu??o (FR) e o ?ndice de reprodu??o (IR), relativo a cultivar de tomate Santa Clara, suscet?vel ao nematoide. Os resultados apresentados indicam que existe variabilidade gen?tica dos clones para a resist?ncia aos nematoides e, elevada propor??o de clones de batata-doce apresentaram rea??o de resist?ncia para as ra?as 1 e 3 do M. incognita e M. javanica. As classifica??es pelo fator de reprodu??o e ?ndice de reprodu??o podem ser utilizadas para avalia??es de n?veis de resist?ncia em clones de batata-doce, promovendo a distin??o entre clones resistentes e suscet?veis. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2014. / ABSTRACT Sweet Potato (Ipomoea batatas (L.)), is considered a rustic plant, however, is susceptible to a lot of pests and diseases. The root-knot nematodes, Meloidogyne spp. are between the most destructive pests of sweet-potato culture. Studies are necessary to explore the genetic variability of the existing specie, in order to obtain plant pathogens resistant clones. The objective of this paper was evaluating sweet potato clones resistance to root-knot nematodes. Three independent experiments were performed in greenhouses to test the sweet potato clone resistance to the root-knot nematodes, in the period of November of 2012 and May of 2013. Sixty-three clones were evaluated in the randomized blocks design, with three replications and six plants in each parcel. We use inocula of Meloidogyne incognita race1, Meloidogyne incognita race 3 e Meloidogyne javanica. The classification of the resistance levels were made according to the reproduction factor (FR), and the reproduction index (IR), relative to cultivar of tomato Santa Clara, susceptible to the nematode. The results indicate that exist a genetic variability of the clones to resist nematodes, and a high portion sweet potato clones presented a resistance reaction to the races 1 e 3 of M. incognita e M. javanica. The criteria for the classification of the reproduction factor (FR), and the reproduction index (IR), may be utilized to the evaluation of the resistance level of the sweet potato clones, promoting the distinction among clones resistant and susceptible.