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Hot spots for diversity of Magnaporthe oryzae physiological races in irrigated rice fields in Brazil 86
Dias Neto,Justino José; Santos,Gil Rodrigues dos; Anjos,Liamar Maria dos; Rangel,Paulo Hideo Nakano; Ferreira,Marcio Elias.
The objective of this work was to evaluate the Magnaporthe oryzae pathotype diversity in new commercial irrigated rice fields in the Araguaia River Valley, state of Tocantins, Brazil. The causal agent of rice blast has heavily affected rice production in the region. Despite the efforts of breeding programs, blast resistance breakdown has been recorded shortly after the release of new resistant cultivars developed for the region. Among the causes of resistance breakage is the capacity of the fungus to rapidly develop new pathotypes. A sample of 479 M. oryzae monosporic isolates was obtained and tested using the international rice blast differential set. Isolate collections were made in small areas designed as trap nurseries and in scattered sites in their...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pyricularia; Pathogenicity; Pathotype; Race.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000300004
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Mapping of quantitative trait loci for thermosensitive genic male sterility in indica rice 86
Alcochete,Antonio Alberto Neves de; Rangel,Paulo Hideo Nakano; Ferreira,Marcio Elias.
The objective of this work was to select and use microsatellite markers, to map genomic regions associated with the genetic control of thermosensitive genic male sterility (TGMS) in rice. An F2 population, derived from the cross between fertile and TGMS indica lines, was used to construct a microsatellite-based genetic map of rice. The TGMS phenotype showed a continuous variation in the segregant population. A low level of segregation distortion was detected in the F2 (14.65%), whose cause was found to be zygotic selection. There was no evidence suggesting a cause-effect relationship between zygotic selection and the control of TGMS in this cross. A linkage map comprising 1,213.3 cM was constructed based on the segregation data of the F2 population....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Microsatellite; Hybrid rice; Genetic map.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005001200004
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