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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
23/04/1999 |
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Data da última atualização: |
23/04/1999 |
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Autoria: |
DIAS, J. C. A. |
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Título: |
Inheritance of resistance to Septoria nodorum (Berk) Berk. in a wheat cross. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Lincoln, Nebraska: University of Nebraska, 1978. |
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Páginas: |
59p. |
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Idioma: |
Inglês |
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Notas: |
Tese Mestrado. |
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Conteúdo: |
Inheritance of sedling resistance to Septoria nodorum (Berk.) Berk. was studied in the cross of spring wheat, Toropi, with a hard red winter wheat, Centurk 78, at the University of Nebraska-Lincoln greenhouse, Lincoln, Nebraska. Percent necrosis per square centimeter of leaf area and number of lesions per square centimeter of leaf area were symptom parameters measured. Analyses od variance of the symptom expressions in the parents, F1, F2 and backcrosses to each parent were calculated. The genetic variation obtained though the frequency distribution for each generation and parents was studied. Heritability in the broad sense was calculated for each character studied. The heritability in the broad sense was relatively high, especially in the second test for both characters. The genetic variances of the F2 progenies were greater than the genetic variances within the parents. In order to obtain better information to support the finding of this study, the tests made with F2 plants should be followed up by head-row tests. These tests were not made in this study due to limitations of time. The lack of significant dominance effects the absence of heterosis for both symptom parameters studied in this experiment provide evidence that dominance may be lacking in loci controlling either susceptibility or resistance to Septoria nodorum in this cross. Very positive transgressive segregation for resistance or susceptibility was not evident in this research. From the results of this experiment it can be concluded that quantitative factors are involved in the inheritance of resistance to Septoria nodorum. Therefore, efficient breeding procedures which allow the accumulation of favorable genes for resistance through some recurrent selection system should be effective in the improvement of high-yielding lines highly resistant to Septoria nodorum. Since the pricipal problem in conducting recurrent selection in a self-pollinated crop is the large number of crosses necessary in the recombination phase of the selection cycle, simple seed descent methods could be used, as suggested by Brim (1966) and Compton (1968). MenosInheritance of sedling resistance to Septoria nodorum (Berk.) Berk. was studied in the cross of spring wheat, Toropi, with a hard red winter wheat, Centurk 78, at the University of Nebraska-Lincoln greenhouse, Lincoln, Nebraska. Percent necrosis per square centimeter of leaf area and number of lesions per square centimeter of leaf area were symptom parameters measured. Analyses od variance of the symptom expressions in the parents, F1, F2 and backcrosses to each parent were calculated. The genetic variation obtained though the frequency distribution for each generation and parents was studied. Heritability in the broad sense was calculated for each character studied. The heritability in the broad sense was relatively high, especially in the second test for both characters. The genetic variances of the F2 progenies were greater than the genetic variances within the parents. In order to obtain better information to support the finding of this study, the tests made with F2 plants should be followed up by head-row tests. These tests were not made in this study due to limitations of time. The lack of significant dominance effects the absence of heterosis for both symptom parameters studied in this experiment provide evidence that dominance may be lacking in loci controlling either susceptibility or resistance to Septoria nodorum in this cross. Very positive transgressive segregation for resistance or susceptibility was not evident in this research. From the results of this experi... Mostrar Tudo |
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Palavras-Chave: |
Disease resitance; Fungal diseases; Plant diseases; Wheats. |
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Thesagro: |
Cruzamento; Doença de Planta; Doença Fúngica; Septoria Nodorum; Trigo; Triticum Aestivum; Variedade Resistente. |
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Thesaurus Nal: |
hybridization. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02879nam a2200277 a 4500
001 1563293
005 1999-04-23
008 1978 bl uuuu m 00u1 u #d
100 1 $aDIAS, J. C. A.
245 $aInheritance of resistance to Septoria nodorum (Berk) Berk. in a wheat cross.
260 $aLincoln, Nebraska: University of Nebraska$c1978
300 $a59p.
500 $aTese Mestrado.
520 $aInheritance of sedling resistance to Septoria nodorum (Berk.) Berk. was studied in the cross of spring wheat, Toropi, with a hard red winter wheat, Centurk 78, at the University of Nebraska-Lincoln greenhouse, Lincoln, Nebraska. Percent necrosis per square centimeter of leaf area and number of lesions per square centimeter of leaf area were symptom parameters measured. Analyses od variance of the symptom expressions in the parents, F1, F2 and backcrosses to each parent were calculated. The genetic variation obtained though the frequency distribution for each generation and parents was studied. Heritability in the broad sense was calculated for each character studied. The heritability in the broad sense was relatively high, especially in the second test for both characters. The genetic variances of the F2 progenies were greater than the genetic variances within the parents. In order to obtain better information to support the finding of this study, the tests made with F2 plants should be followed up by head-row tests. These tests were not made in this study due to limitations of time. The lack of significant dominance effects the absence of heterosis for both symptom parameters studied in this experiment provide evidence that dominance may be lacking in loci controlling either susceptibility or resistance to Septoria nodorum in this cross. Very positive transgressive segregation for resistance or susceptibility was not evident in this research. From the results of this experiment it can be concluded that quantitative factors are involved in the inheritance of resistance to Septoria nodorum. Therefore, efficient breeding procedures which allow the accumulation of favorable genes for resistance through some recurrent selection system should be effective in the improvement of high-yielding lines highly resistant to Septoria nodorum. Since the pricipal problem in conducting recurrent selection in a self-pollinated crop is the large number of crosses necessary in the recombination phase of the selection cycle, simple seed descent methods could be used, as suggested by Brim (1966) and Compton (1968).
650 $ahybridization
650 $aCruzamento
650 $aDoença de Planta
650 $aDoença Fúngica
650 $aSeptoria Nodorum
650 $aTrigo
650 $aTriticum Aestivum
650 $aVariedade Resistente
653 $aDisease resitance
653 $aFungal diseases
653 $aPlant diseases
653 $aWheats
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Embrapa Cerrados (CPAC) |
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| Registros recuperados : 57 | |
| 1. |  | DIAS, J. C. A. Avaliação de cultivares de colza introduzidas. In: EMBRAPA. Centro Nacional de Pesquisa de Trigo. Colza: resultados de pesquisa 1984. Passo Fundo, 1985. p. 5-14 Trabalho apresentado na V Reunião Anual de Programação de Pesquisa e de Assistência Técnica da Cultura da Colza, Cruz Alta, 1985.| Biblioteca(s): Embrapa Trigo. |
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| 2. | | DIAS, J. C. A. Avaliação de cultivares de colza introduzidas. In: EMBRAPA. Centro Nacional de Pesquisa de Trigo. Colza: resultados de pesquisa 1985. Passo Fundo, 1986. p. 5-12 Trabalho apresentado na VI Reunião Anual de Programação de Pesquisa e de Assistência Técnica da Cultura da Colza, Ijuí, 1986.| Biblioteca(s): Embrapa Trigo. |
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| 3. | | DIAS, J. C. A. Condução de populações segregantes de colza. In: EMBRAPA. Centro Nacional de Pesquisa de Trigo. Colza: resultados de pesquisa 1983. Passo Fundo, 1984. 10 p. Trabalho apresentado na Reunião Anual de Programação de Pesquisa e de Assistência Técnica da Cultura da Colza, Pelotas, 1984.| Biblioteca(s): Embrapa Trigo. |
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| 5. | | DIAS, J. C. A. Ensaio preliminar de linhagem de colza. In: EMBRAPA. Centro Nacional de Pesquisa de Trigo. Colza: resultados de pesquisa 1983. Passo Fundo, 1984. p. 19-24 Trabalho apresentado na Reunião Anual de Programação de Pesquisa e de Assistência Técnica da Cultura da Colza, Pelotas, 1984.| Biblioteca(s): Embrapa Trigo. |
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| 6. | | DIAS, J. C. A. Ensaio preliminar de linhagens de colza. In: EMBRAPA. Centro Nacional de Pesquisa de Trigo. Colza: resultados de pesquisa 1984. Passo Fundo, 1985. p. 15-23 Trabalho apresentado na V Reunião Anual de Programação de Pesquisa e de Assistência Técnica da Cultura da Colza, Cruz Alta, 1985.| Biblioteca(s): Embrapa Trigo. |
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| 7. | | DIAS, J. C. A. Introdução de cultivares alienigenas de colza. In: EMBRAPA. Centro Nacional de Pesquisa de Trigo. Colza: resultados de pesquisa 1983. Passo Fundo, 1984. p. 8-9 Trabalho apresentado na Reunião Anual de Programação de Pesquisa e de Assistência Técnica da Cultura da Colza, Pelotas, 1984.| Biblioteca(s): Embrapa Trigo. |
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| Registros recuperados : 57 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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