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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Resistência de cultivares diferenciadoras do míldio da alface a nematoides de galha / Resistance of lettuce downy mildew's differential cultivars to root-knot nematodes

Vidal, Roberta Luiza 16 January 2018 (has links)
Submitted by ROBERTA LUIZA VIDAL null (robertalvidal@gmail.com) on 2018-01-24T18:28:24Z No. of bitstreams: 1 Dissertação_Roberta_Luiza_Vidal.pdf: 1450601 bytes, checksum: edd16eed2fa6fd6a4838da64795991c7 (MD5) / Approved for entry into archive by Karina Gimenes Fernandes null (karinagi@fcav.unesp.br) on 2018-01-26T11:14:58Z (GMT) No. of bitstreams: 1 vidal_rl_me_jabo.pdf: 1409244 bytes, checksum: 56ecd2ad1616f277b1725ec6899dbc3e (MD5) / Made available in DSpace on 2018-01-26T11:14:58Z (GMT). No. of bitstreams: 1 vidal_rl_me_jabo.pdf: 1409244 bytes, checksum: 56ecd2ad1616f277b1725ec6899dbc3e (MD5) Previous issue date: 2018-01-16 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Devido ao potencial danoso e existência de inúmeras raças de míldio da alface (Bremia lactucae Regel), vários países realizam a identificação e monitoramento destas raças através do uso de cultivares diferenciadoras de alface. A identificação de resistência a outras doenças importantes nestas cultivares seria de grande valia para o melhoramento da alface, permitindo a seleção simultânea para doenças. Dentre os patógenos de solo, destacam-se os nematoides de galha (Meloidogyne spp.) por seus danos e dificuldade de controle. O presente trabalho teve como objetivo avaliar a resposta das cultivares diferenciadoras de míldio (C-Set) à M. javanica e M. incognita. O experimento foi conduzido em delineamento inteiramente casualizado, com oito repetições e população inicial de 1.000 ovos e juvenis. As avaliações foram realizadas pelos critérios fator de reprodução e índice de reprodução, 75 dias após a inoculação. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste de Scott-Knott a 5% de probabilidade. Todos as cultivares são suscetíveis a M. incognita. As cultivares Argelès, Kibrille, Balesta, Colorado, Design, Bartoli e NunDm15 são classificados como resistentes a M. javanica pelo fator de reprodução e podem ser explorados para seleção simultânea ao míldio e a esta espécie de nematoide. / Due to the harmful potential and existence of numerous races of lettuce downy mildew (Bremia lactucae Regel), several countries perform the identification and monitoring of these races through the use of differential lettuce cultivars. The identification of resistance to other important diseases in these cultivars would be of great value for the lettuce’s breeding, allowing the simultaneous selection for diseases. Among the soil pathogens, the most important are the root-knot nematodes (Meloidogyne spp.) due to their damage and difficulty of control. In the present work it was evaluated the response of these differential cultivars (C-Set) to M. javanica and M. incognita. The experiment was conducted in a completely randomized design, with eight replications and initial population of 1.000 eggs and juveniles. The evaluations were performed by the criteria of reproduction factor and reproduction index, 75 days after inoculation. Data were submitted to analysis of variance and the means were compared by Scott-Knott test at 5% probability. All cultivars are susceptible to M. incognita. The cultivars Argelès, Kibrille, Balesta, Colorado, Design, Bartoli and NunDm15 are classified as resistant to M. javanica by the reproduction factor and can be exploited for simultaneous selection to mildew and this species of nematode.

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