Resistência de cultivares diferenciadoras do míldio da alface a nematoides de galha
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Data
2018-01-16
Autores
Vidal, Roberta Luiza
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Universidade Estadual Paulista (Unesp)
Resumo
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.
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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Palavras-chave
Bremia lactuca, Genes de resistência, Lactuca sativa, Melhoramento, Meloidogyne spp.